Programs & Examples On #Pam

Pluggable authentication modules, a flexible framework for configuring authentication, most commonly the login component of Linux systems, but used in other components and operating systems.

Avoid "current URL string parser is deprecated" warning by setting useNewUrlParser to true

Here's how I have it. The hint didn't show on my console until I updated npm a couple of days prior.

.connect has three parameters, the URI, options, and err.

mongoose.connect(
    keys.getDbConnectionString(),
    { useNewUrlParser: true },
    err => {
        if (err) 
            throw err;
        console.log(`Successfully connected to database.`);
    }
);

Hibernate Error executing DDL via JDBC Statement

I got this same error when i was trying to make a table with name "admin". Then I used @Table annotation and gave table a different name like @Table(name = "admins"). I think some words are reserved (like :- keywords in java) and you can not use them.

@Entity
@Table(name = "admins")
public class Admin extends TrackedEntity {

}

Expected response code 250 but got code "535", with message "535-5.7.8 Username and Password not accepted

I had the same problem, changing my gmail password fixed the issue, and also don't forget to enable less secure app on on your gmail account

Jenkins fails when running "service start jenkins"

I was trying to install it in kubuntu 18.04, and i was already sure that i had java installed, I confirmed by trying

java -version

I got the output like that

java version "1.8.0_91"
Java(TM) SE Runtime Environment (build 1.8.0_91-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.91-b14, mixed mode)

Since I already know that my java PATH variables are defined in /etc/environment file, I added that file to the top of /etc/init.d/jenkins file

source /etc/environment

you can even remove the PATH from /etc/init.d/jenkins file, since it's already defined in /etc/environment

after that, i restarted my jenkins server,and it seemed to start working fine from localhost:8080

Provide static IP to docker containers via docker-compose

Note that I don't recommend a fixed IP for containers in Docker unless you're doing something that allows routing from outside to the inside of your container network (e.g. macvlan). DNS is already there for service discovery inside of the container network and supports container scaling. And outside the container network, you should use exposed ports on the host. With that disclaimer, here's the compose file you want:

version: '2'

services:
  mysql:
    container_name: mysql
    image: mysql:latest
    restart: always
    environment:
      - MYSQL_ROOT_PASSWORD=root
    ports:
     - "3306:3306"
    networks:
      vpcbr:
        ipv4_address: 10.5.0.5

  apigw-tomcat:
    container_name: apigw-tomcat
    build: tomcat/.
    ports:
     - "8080:8080"
     - "8009:8009"
    networks:
      vpcbr:
        ipv4_address: 10.5.0.6
    depends_on:
     - mysql

networks:
  vpcbr:
    driver: bridge
    ipam:
     config:
       - subnet: 10.5.0.0/16
         gateway: 10.5.0.1

Install pip in docker

An alternative is to use the Alpine Linux containers, e.g. python:2.7-alpine. They offer pip out of the box (and have a smaller footprint which leads to faster builds etc).

How to force Docker for a clean build of an image

I would not recommend using --no-cache in your case.

You are running a couple of installations from step 3 to 9 (I would, by the way, prefer using a one liner) and if you don't want the overhead of re-running these steps each time you are building your image you can modify your Dockerfile with a temporary step prior to your wget instruction.

I use to do something like RUN ls . and change it to RUN ls ./ then RUN ls ./. and so on for each modification done on the tarball retrieved by wget

You can of course do something like RUN echo 'test1' > test && rm test increasing the number in 'test1 for each iteration.

It looks dirty, but as far as I know it's the most efficient way to continue benefiting from the cache system of Docker, which saves time when you have many layers...

Forward X11 failed: Network error: Connection refused

fill in the "X display location" did not work for me. but install MobaXterm did the job.

'module' has no attribute 'urlencode'

urllib has been split up in Python 3.

The urllib.urlencode() function is now urllib.parse.urlencode(),

the urllib.urlopen() function is now urllib.request.urlopen().

Spring boot - Not a managed type

I have the same probblem, in version spring boot v1.3.x what i did is upgrade spring boot to version 1.5.7.RELEASE. Then the probblem gone.

Maven error :Perhaps you are running on a JRE rather than a JDK?

If the above solutions doesn't work then try to place java path before maven in path of environment variable. It worked for me.

%JAVA_HOME%\bin

C:\Program Files\apache-maven-3.6.1-bin\apache-maven-3.6.1\bin

How to set editor theme in IntelliJ Idea

For IntelliJ in Mac

View -> Quick Switch theme (^`)-> color schema

how to set ulimit / file descriptor on docker container the image tag is phusion/baseimage-docker

After some searching I found this on a Google groups discussion:

docker currently inhibits this capability for enhanced safety.

That is because the ulimit settings of the host system apply to the docker container. It is regarded as a security risk that programs running in a container can change the ulimit settings for the host.

The good news is that you have two different solutions to choose from.

  1. Remove sys_resource from lxc_template.go and recompile docker. Then you'll be able to set the ulimit as high as you like.

or

  1. Stop the docker demon. Change the ulimit settings on the host. Start the docker demon. It now has your revised limits, and its child processes as well.

I applied the second method:

  1. sudo service docker stop;

  2. changed the limits in /etc/security/limits.conf

  3. reboot the machine

  4. run my container

  5. run ulimit -a in the container to confirm the open files limit has been inherited.

See: https://groups.google.com/forum/#!searchin/docker-user/limits/docker-user/T45Kc9vD804/v8J_N4gLbacJ

Disable button after click in JQuery

*Updated

jQuery version would be something like below:

function load(recieving_id){
    $('#roommate_but').prop('disabled', true);
    $.get('include.inc.php?i=' + recieving_id, function(data) {
        $("#roommate_but").html(data);
    });
}

How does Facebook disable the browser's integrated Developer Tools?

I'm a security engineer at Facebook and this is my fault. We're testing this for some users to see if it can slow down some attacks where users are tricked into pasting (malicious) JavaScript code into the browser console.

Just to be clear: trying to block hackers client-side is a bad idea in general; this is to protect against a specific social engineering attack.

If you ended up in the test group and are annoyed by this, sorry. I tried to make the old opt-out page (now help page) as simple as possible while still being scary enough to stop at least some of the victims.

The actual code is pretty similar to @joeldixon66's link; ours is a little more complicated for no good reason.

Chrome wraps all console code in

with ((console && console._commandLineAPI) || {}) {
  <code goes here>
}

... so the site redefines console._commandLineAPI to throw:

Object.defineProperty(console, '_commandLineAPI',
   { get : function() { throw 'Nooo!' } })

This is not quite enough (try it!), but that's the main trick.


Epilogue: The Chrome team decided that defeating the console from user-side JS was a bug and fixed the issue, rendering this technique invalid. Afterwards, additional protection was added to protect users from self-xss.

How to increase Neo4j's maximum file open limit (ulimit) in Ubuntu?

Try run this command it will create a *_limits.conf file under /etc/security/limits.d

echo "* soft nofile 102400" > /etc/security/limits.d/*_limits.conf && echo "* hard nofile 102400" >> /etc/security/limits.d/*_limits.conf

Just exit from terminal and login again and verify by ulimit -n it will set for * users

Disable password authentication for SSH

I followed these steps (for Mac).

In /etc/ssh/sshd_config change

#ChallengeResponseAuthentication yes
#PasswordAuthentication yes

to

ChallengeResponseAuthentication no
PasswordAuthentication no

Now generate the RSA key:

ssh-keygen -t rsa -P '' -f ~/.ssh/id_rsa

(For me an RSA key worked. A DSA key did not work.)

A private key will be generated in ~/.ssh/id_rsa along with ~/.ssh/id_rsa.pub (public key).

Now move to the .ssh folder: cd ~/.ssh

Enter rm -rf authorized_keys (sometimes multiple keys lead to an error).

Enter vi authorized_keys

Enter :wq to save this empty file

Enter cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys

Restart the SSH:

sudo launchctl stop com.openssh.sshd
sudo launchctl start com.openssh.sshd

How to highlight a selected row in ngRepeat?

Each row has an ID. All you have to do is to send this ID to the function setSelected(), store it (in $scope.idSelectedVote for instance), and then check for each row if the selected ID is the same as the current one. Here is a solution (see the documentation for ngClass, if needed):

$scope.idSelectedVote = null;
$scope.setSelected = function (idSelectedVote) {
   $scope.idSelectedVote = idSelectedVote;
};
<ul ng-repeat="vote in votes" ng-click="setSelected(vote.id)" ng-class="{selected: vote.id === idSelectedVote}">
    ...
</ul>

Plunker

Is there a concise way to iterate over a stream with indices in Java 8?

As jean-baptiste-yunès said, if your stream is based on a java List then using an AtomicInteger and its incrementAndGet method is a very good solution to the problem and the returned integer does correspond to the index in the original List as long as you do not use a parallel stream.

sending email via php mail function goes to spam

The problem is simple that the PHP-Mail function is not using a well configured SMTP Server.

Nowadays Email-Clients and Servers perform massive checks on the emails sending server, like Reverse-DNS-Lookups, Graylisting and whatevs. All this tests will fail with the php mail() function. If you are using a dynamic ip, its even worse.

Use the PHPMailer-Class and configure it to use smtp-auth along with a well configured, dedicated SMTP Server (either a local one, or a remote one) and your problems are gone.

https://github.com/PHPMailer/PHPMailer

How to get label text value form a html page?

Try this:

document.getElementById('*spaM4').textContent

If you need to target < IE9 then you need to use .innerText

Login credentials not working with Gmail SMTP

I beleive I'm little late here. But I think this would help for the new peeps! If you're using smtp.gmail.com , then you have to do the following:

  1. Turn on the less secure apps

  2. You'll get the security mail in your gmail inbox, Click Yes,it's me in that.

  3. Now run your code again.

Javamail Could not convert socket to TLS GMail

I got similar problem when default SSL protocol for sending emails was set to TLSv1 and smtp server was not supporting this protocol anymore. Trick was to use newer protocol:

mail.smtp.ssl.protocols=TLSv1.2

Exception in thread "main" java.util.NoSuchElementException

Reimeus is right, you see this because of in.close in your chooseCave(). Also, this is wrong.

if (playAgain == "yes") {
      play = true;
}

You should use equals instead of "==".

if (playAgain.equals("yes")) {
      play = true;
}

Standardize data columns in R

Scale can be used for both full data frame and specific columns. For specific columns, following code can be used:

trainingSet[, 3:7] = scale(trainingSet[, 3:7]) # For column 3 to 7
trainingSet[, 8] = scale(trainingSet[, 8]) # For column 8 

Full data frame

trainingSet <- scale(trainingSet)

Relative imports for the billionth time

I had a similar problem where I didn't want to change the Python module search path and needed to load a module relatively from a script (in spite of "scripts can't import relative with all" as BrenBarn explained nicely above).

So I used the following hack. Unfortunately, it relies on the imp module that became deprecated since version 3.4 to be dropped in favour of importlib. (Is this possible with importlib, too? I don't know.) Still, the hack works for now.

Example for accessing members of moduleX in subpackage1 from a script residing in the subpackage2 folder:

#!/usr/bin/env python3

import inspect
import imp
import os

def get_script_dir(follow_symlinks=True):
    """
    Return directory of code defining this very function.
    Should work from a module as well as from a script.
    """
    script_path = inspect.getabsfile(get_script_dir)
    if follow_symlinks:
        script_path = os.path.realpath(script_path)
    return os.path.dirname(script_path)

# loading the module (hack, relying on deprecated imp-module)
PARENT_PATH = os.path.dirname(get_script_dir())
(x_file, x_path, x_desc) = imp.find_module('moduleX', [PARENT_PATH+'/'+'subpackage1'])
module_x = imp.load_module('subpackage1.moduleX', x_file, x_path, x_desc)

# importing a function and a value
function = module_x.my_function
VALUE = module_x.MY_CONST

A cleaner approach seems to be to modify the sys.path used for loading modules as mentioned by Federico.

#!/usr/bin/env python3

if __name__ == '__main__' and __package__ is None:
    from os import sys, path
    # __file__ should be defined in this case
    PARENT_DIR = path.dirname(path.dirname(path.abspath(__file__)))
   sys.path.append(PARENT_DIR)
from subpackage1.moduleX import *

What's the difference between .so, .la and .a library files?

.so files are dynamic libraries. The suffix stands for "shared object", because all the applications that are linked with the library use the same file, rather than making a copy in the resulting executable.

.a files are static libraries. The suffix stands for "archive", because they're actually just an archive (made with the ar command -- a predecessor of tar that's now just used for making libraries) of the original .o object files.

.la files are text files used by the GNU "libtools" package to describe the files that make up the corresponding library. You can find more information about them in this question: What are libtool's .la file for?

Static and dynamic libraries each have pros and cons.

Static pro: The user always uses the version of the library that you've tested with your application, so there shouldn't be any surprising compatibility problems.

Static con: If a problem is fixed in a library, you need to redistribute your application to take advantage of it. However, unless it's a library that users are likely to update on their own, you'd might need to do this anyway.

Dynamic pro: Your process's memory footprint is smaller, because the memory used for the library is amortized among all the processes using the library.

Dynamic pro: Libraries can be loaded on demand at run time; this is good for plugins, so you don't have to choose the plugins to be used when compiling and installing the software. New plugins can be added on the fly.

Dynamic con: The library might not exist on the system where someone is trying to install the application, or they might have a version that's not compatible with the application. To mitigate this, the application package might need to include a copy of the library, so it can install it if necessary. This is also often mitigated by package managers, which can download and install any necessary dependencies.

Dynamic con: Link-Time Optimization is generally not possible, so there could possibly be efficiency implications in high-performance applications. See the Wikipedia discussion of WPO and LTO.

Dynamic libraries are especially useful for system libraries, like libc. These libraries often need to include code that's dependent on the specific OS and version, because kernel interfaces have changed. If you link a program with a static system library, it will only run on the version of the OS that this library version was written for. But if you use a dynamic library, it will automatically pick up the library that's installed on the system you run on.

Add primary key to existing table

Necromancing.
Just in case anybody has as good a schema to work with as me...
Here is how to do it correctly:

In this example, the table name is dbo.T_SYS_Language_Forms, and the column name is LANG_UID

-- First, chech if the table exists...
IF 0 < (
    SELECT COUNT(*) FROM INFORMATION_SCHEMA.TABLES 
    WHERE TABLE_TYPE = 'BASE TABLE'
    AND TABLE_SCHEMA = 'dbo'
    AND TABLE_NAME = 'T_SYS_Language_Forms'
)
BEGIN
    -- Check for NULL values in the primary-key column
    IF 0 = (SELECT COUNT(*) FROM T_SYS_Language_Forms WHERE LANG_UID IS NULL)
    BEGIN
        ALTER TABLE T_SYS_Language_Forms ALTER COLUMN LANG_UID uniqueidentifier NOT NULL 

        -- No, don't drop, FK references might already exist...
        -- Drop PK if exists (it is very possible it does not have the name you think it has...)
        -- ALTER TABLE T_SYS_Language_Forms DROP CONSTRAINT pk_constraint_name 
        --DECLARE @pkDropCommand nvarchar(1000) 
        --SET @pkDropCommand = N'ALTER TABLE T_SYS_Language_Forms DROP CONSTRAINT ' + QUOTENAME((SELECT CONSTRAINT_NAME FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS 
        --WHERE CONSTRAINT_TYPE = 'PRIMARY KEY' 
        --AND TABLE_SCHEMA = 'dbo' 
        --AND TABLE_NAME = 'T_SYS_Language_Forms' 
        ----AND CONSTRAINT_NAME = 'PK_T_SYS_Language_Forms' 
        --))
        ---- PRINT @pkDropCommand 
        --EXECUTE(@pkDropCommand) 
        -- Instead do
        -- EXEC sp_rename 'dbo.T_SYS_Language_Forms.PK_T_SYS_Language_Forms1234565', 'PK_T_SYS_Language_Forms';

        -- Check if they keys are unique (it is very possible they might not be)        
        IF 1 >= (SELECT TOP 1 COUNT(*) AS cnt FROM T_SYS_Language_Forms GROUP BY LANG_UID ORDER BY cnt DESC)
        BEGIN

            -- If no Primary key for this table
            IF 0 =  
            (
                SELECT COUNT(*) FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS 
                WHERE CONSTRAINT_TYPE = 'PRIMARY KEY' 
                AND TABLE_SCHEMA = 'dbo' 
                AND TABLE_NAME = 'T_SYS_Language_Forms' 
                -- AND CONSTRAINT_NAME = 'PK_T_SYS_Language_Forms' 
            )
                ALTER TABLE T_SYS_Language_Forms ADD CONSTRAINT PK_T_SYS_Language_Forms PRIMARY KEY CLUSTERED (LANG_UID ASC)
            ;

        END -- End uniqueness check
        ELSE
            PRINT 'FSCK, this column has duplicate keys, and can thus not be changed to primary key...' 
    END -- End NULL check
    ELSE
        PRINT 'FSCK, need to figure out how to update NULL value(s)...' 
END 

How to solve the “failed to lazily initialize a collection of role” Hibernate exception

From my experience, I have the following methods to solved the famous LazyInitializationException:

(1) Use Hibernate.initialize

Hibernate.initialize(topics.getComments());

(2) Use JOIN FETCH

You can use the JOIN FETCH syntax in your JPQL to explicitly fetch the child collection out. This is some how like EAGER fetching.

(3) Use OpenSessionInViewFilter

LazyInitializationException often occur in view layer. If you use Spring framework, you can use OpenSessionInViewFilter. However, I do not suggest you to do so. It may leads to performance issue if not use correctly.

CASE (Contains) rather than equal statement

Pseudo code, something like:

CASE
  When CHARINDEX('lactulose', dbo.Table.Column) > 0 Then 'BP Medication'
ELSE ''
END AS 'Medication Type'

This does not care where the keyword is found in the list and avoids depending on formatting of spaces and commas.

phpmailer: Reply using only "Reply To" address

I have found the answer to this, and it is annoyingly/frustratingly simple! Basically the reply to addresses needed to be added before the from address as such:

$mail->addReplyTo('[email protected]', 'Reply to name');
$mail->SetFrom('[email protected]', 'Mailbox name');

Looking at the phpmailer code in more detail this is the offending line:

public function SetFrom($address, $name = '',$auto=1) {
   $address = trim($address);
   $name = trim(preg_replace('/[\r\n]+/', '', $name)); //Strip breaks and trim
   if (!self::ValidateAddress($address)) {
     $this->SetError($this->Lang('invalid_address').': '. $address);
     if ($this->exceptions) {
       throw new phpmailerException($this->Lang('invalid_address').': '.$address);
     }
     echo $this->Lang('invalid_address').': '.$address;
     return false;
   }
   $this->From = $address;
   $this->FromName = $name;
   if ($auto) {
      if (empty($this->ReplyTo)) {
         $this->AddAnAddress('ReplyTo', $address, $name);
      }
      if (empty($this->Sender)) {
         $this->Sender = $address;
      }
   }
   return true;
}

Specifically this line:

if (empty($this->ReplyTo)) {
   $this->AddAnAddress('ReplyTo', $address, $name);
}

Thanks for your help everyone!

Java socket API: How to tell if a connection has been closed?

I see the other answer just posted, but I think you are interactive with clients playing your game, so I may pose another approach (while BufferedReader is definitely valid in some cases).

If you wanted to... you could delegate the "registration" responsibility to the client. I.e. you would have a collection of connected users with a timestamp on the last message received from each... if a client times out, you would force a re-registration of the client, but that leads to the quote and idea below.

I have read that to actually determine whether or not a socket has been closed data must be written to the output stream and an exception must be caught. This seems like a really unclean way to handle this situation.

If your Java code did not close/disconnect the Socket, then how else would you be notified that the remote host closed your connection? Ultimately, your try/catch is doing roughly the same thing that a poller listening for events on the ACTUAL socket would be doing. Consider the following:

  • your local system could close your socket without notifying you... that is just the implementation of Socket (i.e. it doesn't poll the hardware/driver/firmware/whatever for state change).
  • new Socket(Proxy p)... there are multiple parties (6 endpoints really) that could be closing the connection on you...

I think one of the features of the abstracted languages is that you are abstracted from the minutia. Think of the using keyword in C# (try/finally) for SqlConnection s or whatever... it's just the cost of doing business... I think that try/catch/finally is the accepted and necesary pattern for Socket use.

Accessing items in an collections.OrderedDict by index

It's a new era and with Python 3.6.1 dictionaries now retain their order. These semantics aren't explicit because that would require BDFL approval. But Raymond Hettinger is the next best thing (and funnier) and he makes a pretty strong case that dictionaries will be ordered for a very long time.

So now it's easy to create slices of a dictionary:

test_dict = {
                'first':  1,
                'second': 2,
                'third':  3,
                'fourth': 4
            }

list(test_dict.items())[:2]

Note: Dictonary insertion-order preservation is now official in Python 3.7.

The calling thread cannot access this object because a different thread owns it

I kept getting the error when I added cascading comboboxes to my WPF application, and resolved the error by using this API:

    using System.Windows.Data;

    private readonly object _lock = new object();
    private CustomObservableCollection<string> _myUiBoundProperty;
    public CustomObservableCollection<string> MyUiBoundProperty
    {
        get { return _myUiBoundProperty; }
        set
        {
            if (value == _myUiBoundProperty) return;
            _myUiBoundProperty = value;
            NotifyPropertyChanged(nameof(MyUiBoundProperty));
        }
    }

    public MyViewModelCtor(INavigationService navigationService) 
    {
       // Other code...
       BindingOperations.EnableCollectionSynchronization(AvailableDefectSubCategories, _lock );

    }

For details, please see https://msdn.microsoft.com/query/dev14.query?appId=Dev14IDEF1&l=EN-US&k=k(System.Windows.Data.BindingOperations.EnableCollectionSynchronization);k(TargetFrameworkMoniker-.NETFramework,Version%3Dv4.7);k(DevLang-csharp)&rd=true

Python list of dictionaries search

One simple way using list comprehensions is , if l is the list

l = [
{"name": "Tom", "age": 10},
{"name": "Mark", "age": 5},
{"name": "Pam", "age": 7}
]

then

[d['age'] for d in l if d['name']=='Tom']

How to filter Android logcat by application?

When we get some error from our application, Logcat will show session filter automatically. We can create session filter by self. Just add a new logcat filter, fill the filter name form. Then fill the by application name with your application package. (for example : my application is "Adukan" and the package is "com.adukan", so I fill by application name with application package "com.adukan")

How to Create a Form Dynamically Via Javascript

some thing as follows ::

Add this After the body tag

This is a rough sketch, you will need to modify it according to your needs.

<script>
var f = document.createElement("form");
f.setAttribute('method',"post");
f.setAttribute('action',"submit.php");

var i = document.createElement("input"); //input element, text
i.setAttribute('type',"text");
i.setAttribute('name',"username");

var s = document.createElement("input"); //input element, Submit button
s.setAttribute('type',"submit");
s.setAttribute('value',"Submit");

f.appendChild(i);
f.appendChild(s);

//and some more input elements here
//and dont forget to add a submit button

document.getElementsByTagName('body')[0].appendChild(f);

</script>

embedding image in html email

It may be of interest that both Outlook and Outlook Express can generate these multipart image email formats, if you insert the image files using the Insert / Picture menu function.

Obviously the email type must be set to HTML (not plain text).

Any other method (e.g. drag/drop, or any command-line invocation) results in the image(s) being sent as an attachment.

If you then send such an email to yourself, you can see how it is formatted! :)

FWIW, I am looking for a standalone windows executable which does inline images from the command line mode, but there seem to be none. It's a path which many have gone up... One can do it with say Outlook Express, by passing it an appropriately formatted .eml file.

How to forcefully set IE's Compatibility Mode off from the server-side?

Update: More useful information What does <meta http-equiv="X-UA-Compatible" content="IE=edge"> do?

Maybe this url can help you: Activating Browser Modes with Doctype

Edit: Today we were able to override the compatibility view with: <meta http-equiv="X-UA-Compatible" content="IE=EmulateIE8" />

How to use Jackson to deserialise an array of objects

For Generic Implementation:

public static <T> List<T> parseJsonArray(String json,
                                         Class<T> classOnWhichArrayIsDefined) 
                                         throws IOException, ClassNotFoundException {
   ObjectMapper mapper = new ObjectMapper();
   Class<T[]> arrayClass = (Class<T[]>) Class.forName("[L" + classOnWhichArrayIsDefined.getName() + ";");
   T[] objects = mapper.readValue(json, arrayClass);
   return Arrays.asList(objects);
}

Filter output in logcat by tagname

Here is how I create a tag:

private static final String TAG = SomeActivity.class.getSimpleName();
 Log.d(TAG, "some description");

You could use getCannonicalName

Here I have following TAG filters:

  • any (*) View - VERBOSE
  • any (*) Activity - VERBOSE
  • any tag starting with Xyz(*) - ERROR
  • System.out - SILENT (since I am using Log in my own code)

Here what I type in terminal:

$  adb logcat *View:V *Activity:V Xyz*:E System.out:S

How do I prevent mails sent through PHP mail() from going to spam?

Try PHP Mailer library.
Or Send mail through SMTP filter it before sending it.
Also Try to give all details like FROM, return-path.

How to print to stderr in Python?

If you do a simple test:

import time
import sys

def run1(runs):
    x = 0
    cur = time.time()
    while x < runs:
        x += 1
        print >> sys.stderr, 'X'
    elapsed = (time.time()-cur)
    return elapsed

def run2(runs):
    x = 0
    cur = time.time()
    while x < runs:
        x += 1
        sys.stderr.write('X\n')
        sys.stderr.flush()
    elapsed = (time.time()-cur)
    return elapsed

def compare(runs):
    sum1, sum2 = 0, 0
    x = 0
    while x < runs:
        x += 1
        sum1 += run1(runs)
        sum2 += run2(runs)
    return sum1, sum2

if __name__ == '__main__':
    s1, s2 = compare(1000)
    print "Using (print >> sys.stderr, 'X'): %s" %(s1)
    print "Using (sys.stderr.write('X'),sys.stderr.flush()):%s" %(s2)
    print "Ratio: %f" %(float(s1) / float(s2))

You will find that sys.stderr.write() is consistently 1.81 times faster!

PHP Remove elements from associative array

The way to do this to take your nested target array and copy it in single step to a non-nested array. Delete the key(s) and then assign the final trimmed array to the nested node of the earlier array. Here is a code to make it simple:

$temp_array = $list['resultset'][0];

unset($temp_array['badkey1']);
unset($temp_array['badkey2']);

$list['resultset'][0] = $temp_array;

How to create a multi line body in C# System.Net.Mail.MailMessage

In case you dont need the message body in html, turn it off:

message.IsBodyHtml = false;

then use e.g:

message.Body = "First line" + Environment.NewLine + 
               "Second line";

but if you need to have it in html for some reason, use the html-tag:

message.Body = "First line <br /> Second line";

Should I use the Reply-To header when sending emails as a service to others?

Here is worked for me:

Subject: SomeSubject
From:Company B (me)
Reply-to:Company A
To:Company A's customers

Underscore prefix for property and method names in JavaScript

Welcome to 2019!

It appears a proposal to extend class syntax to allow for # prefixed variable to be private was accepted. Chrome 74 ships with this support.

_ prefixed variable names are considered private by convention but are still public.

This syntax tries to be both terse and intuitive, although it's rather different from other programming languages.

Why was the sigil # chosen, among all the Unicode code points?

  • @ was the initial favorite, but it was taken by decorators. TC39 considered swapping decorators and private state sigils, but the committee decided to defer to the existing usage of transpiler users.
  • _ would cause compatibility issues with existing JavaScript code, which has allowed _ at the start of an identifier or (public) property name for a long time.

This proposal reached Stage 3 in July 2017. Since that time, there has been extensive thought and lengthy discussion about various alternatives. In the end, this thought process and continued community engagement led to renewed consensus on the proposal in this repository. Based on that consensus, implementations are moving forward on this proposal.

See https://caniuse.com/#feat=mdn-javascript_classes_private_class_fields

Process escape sequences in a string in Python

The ast.literal_eval function comes close, but it will expect the string to be properly quoted first.

Of course Python's interpretation of backslash escapes depends on how the string is quoted ("" vs r"" vs u"", triple quotes, etc) so you may want to wrap the user input in suitable quotes and pass to literal_eval. Wrapping it in quotes will also prevent literal_eval from returning a number, tuple, dictionary, etc.

Things still might get tricky if the user types unquoted quotes of the type you intend to wrap around the string.

Page redirect with successful Ajax request

I think you can do that with:

window.location = "your_url";

Convenient way to parse incoming multipart/form-data parameters in a Servlet

multipart/form-data encoded requests are indeed not by default supported by the Servlet API prior to version 3.0. The Servlet API parses the parameters by default using application/x-www-form-urlencoded encoding. When using a different encoding, the request.getParameter() calls will all return null. When you're already on Servlet 3.0 (Glassfish 3, Tomcat 7, etc), then you can use HttpServletRequest#getParts() instead. Also see this blog for extended examples.

Prior to Servlet 3.0, a de facto standard to parse multipart/form-data requests would be using Apache Commons FileUpload. Just carefully read its User Guide and Frequently Asked Questions sections to learn how to use it. I've posted an answer with a code example before here (it also contains an example targeting Servlet 3.0).

SOAP client in .NET - references or examples?

If you can get it to run in a browser then something as simple as this would work

var webRequest = WebRequest.Create(@"http://webservi.se/year/getCurrentYear");

using (var response = webRequest.GetResponse())
{
    using (var rd = new StreamReader(response.GetResponseStream()))
    {
        var soapResult = rd.ReadToEnd();
    }
}

How to generate the JPA entity Metamodel?

It would be awesome if someone also knows the steps for setting this up in Eclipse (I assume it's as simple as setting up an annotation processor, but you never know)

Yes it is. Here are the implementations and instructions for the various JPA 2.0 implementations:

EclipseLink

Hibernate

OpenJPA

DataNucleus


The latest Hibernate implementation is available at:

An older Hibernate implementation is at:

PHP: How to handle <![CDATA[ with SimpleXMLElement?

This did the trick for me:

echo trim($entry->title);

Converting array to list in Java

Can you improve this answer please as this is what I use but im not 100% clear. It works fine but intelliJ added new WeatherStation[0]. Why the 0 ?

_x000D_
_x000D_
    public WeatherStation[] removeElementAtIndex(WeatherStation[] array, int index)_x000D_
    {_x000D_
        List<WeatherStation> list = new ArrayList<WeatherStation>(Arrays.asList(array));_x000D_
        list.remove(index);_x000D_
        return list.toArray(new WeatherStation[0]);_x000D_
    }
_x000D_
_x000D_
_x000D_

Splitting a string at every n-th character

Using plain java:

    String s = "1234567890";
    List<String> list = new Scanner(s).findAll("...").map(MatchResult::group).collect(Collectors.toList());
    System.out.printf("%s%n", list);

Produces the output:

[123, 456, 789]

Note that this discards leftover characters (0 in this case).

Change first commit of project with Git?

If you want to modify only the first commit, you may try git rebase and amend the commit, which is similar to this post: How to modify a specified commit in git?

And if you want to modify all the commits which contain the raw email, filter-branch is the best choice. There is an example of how to change email address globally on the book Pro Git, and you may find this link useful http://git-scm.com/book/en/Git-Tools-Rewriting-History

In Python, how do I split a string and keep the separators?

One Lazy and Simple Solution

Assume your regex pattern is split_pattern = r'(!|\?)'

First, you add some same character as the new separator, like '[cut]'

new_string = re.sub(split_pattern, '\\1[cut]', your_string)

Then you split the new separator, new_string.split('[cut]')

How do I configure git to ignore some files locally?

Both --assume-unchanged and --skip-worktree are NOT A CORRECT WAY to ignore files locally... Kindly check this answer and the notes in the documentation of git update-index. Files that for any reason keep changing frequently (and/or change from a clone to another) and their changes should not be committed, then these files SHOULD NOT be tracked in the first place.

However, the are two proper ways to ignore files locally (both work with untracked files). Either to put files names in .git/info/exclude file which is the local alternative of .gitignore but specific to the current clone. Or to use a global .gitignore (which should be properly used only for common auxiliary files e.g. pyz, pycache, etc) and the file will be ignored in any git repo in your machine.

To make the above as kind of automated (adding to exclude or global .gitignore), you can use the following commands (add to your bash-profile):

  • Per clone local exclude (Note that you should be in the root of the repository when calling the command because of using the relative path), change ##FILE-NAME## to .git/info/exclude
  • Global .gitignore, first make global .gitignore here then change ##FILE-NAME## to ~/.gitignore

Linux

alias git-ignore='echo $1 >> ##FILE-NAME##'
alias git-show-ignored='cat ##FILE-NAME##'
git-unignore(){
  GITFILETOUNIGNORE=${1//\//\\\/}
  sed -i "/$GITFILETOUNIGNORE/d" ##FILE-NAME##
  unset GITFILETOUNIGNORE
}

MacOS (you need the .bak for sed inplace modifications (i.e. you are forced to add a file extension to inplace sed. i.e. make a backup before replacing something), therefore to delete the .bak file I added rm filename.bak)

alias git-ignore='echo $1 >> ##FILE-NAME##'
alias git-show-ignored='cat ##FILE-NAME##'
git-unignore(){
  GITFILETOUNIGNORE=${1//\//\\\/}
  sed -i.bak "/$GITFILETOUNIGNORE/d" ##FILE-NAME##
  rm ##FILE-NAME##.bak
  unset GITFILETOUNIGNORE
}

Then you can do:

git-ignore example_file.txt
git-unignore example_file.txt

Is it possible to forward-declare a function in Python?

One way is to create a handler function. Define the handler early on, and put the handler below all the methods you need to call.

Then when you invoke the handler method to call your functions, they will always be available.

The handler could take an argument nameOfMethodToCall. Then uses a bunch of if statements to call the right method.

This would solve your issue.

def foo():
    print("foo")
    #take input
    nextAction=input('What would you like to do next?:')
    return nextAction

def bar():
    print("bar")
    nextAction=input('What would you like to do next?:')
    return nextAction

def handler(action):
    if(action=="foo"):
        nextAction = foo()
    elif(action=="bar"):
        nextAction = bar()
    else:
        print("You entered invalid input, defaulting to bar")
        nextAction = "bar"
    return nextAction

nextAction=input('What would you like to do next?:')

while 1:
    nextAction = handler(nextAction)

python: how to send mail with TO, CC and BCC?

Don't add the bcc header.

See this: http://mail.python.org/pipermail/email-sig/2004-September/000151.html

And this: """Notice that the second argument to sendmail(), the recipients, is passed as a list. You can include any number of addresses in the list to have the message delivered to each of them in turn. Since the envelope information is separate from the message headers, you can even BCC someone by including them in the method argument but not in the message header.""" from http://pymotw.com/2/smtplib

toaddr = '[email protected]'
cc = ['[email protected]','[email protected]']
bcc = ['[email protected]']
fromaddr = '[email protected]'
message_subject = "disturbance in sector 7"
message_text = "Three are dead in an attack in the sewers below sector 7."
message = "From: %s\r\n" % fromaddr
    + "To: %s\r\n" % toaddr
    + "CC: %s\r\n" % ",".join(cc)
    # don't add this, otherwise "to and cc" receivers will know who are the bcc receivers
    # + "BCC: %s\r\n" % ",".join(bcc)
    + "Subject: %s\r\n" % message_subject
    + "\r\n" 
    + message_text
toaddrs = [toaddr] + cc + bcc
server = smtplib.SMTP('smtp.sunnydale.k12.ca.us')
server.set_debuglevel(1)
server.sendmail(fromaddr, toaddrs, message)
server.quit()

Fastest way to convert a dict's keys & values from `unicode` to `str`?

for a non-nested dict (since the title does not mention that case, it might be interesting for other people)

{str(k): str(v) for k, v in my_dict.items()}

Is embedding background image data into CSS as Base64 good or bad practice?

It's not a good idea when you want your images and style information to be cached separately. Also if you encode a large image or a significant number of images in to your css file it will take the browser longer to download the file leaving your site without any of the style information until the download completes. For small images that you don't intend on changing often if ever it is a fine solution.

as far as generating the base64 encoding:

How to load all modules in a folder?

Just import them by importlib and add them to __all__ (add action is optional) in recurse in the __init__.py of package.

/Foo
    bar.py
    spam.py
    eggs.py
    __init__.py

# __init__.py
import os
import importlib
pyfile_extes = ['py', ]
__all__ = [importlib.import_module('.%s' % filename, __package__) for filename in [os.path.splitext(i)[0] for i in os.listdir(os.path.dirname(__file__)) if os.path.splitext(i)[1] in pyfile_extes] if not filename.startswith('__')]
del os, importlib, pyfile_extes

What is the best way to programmatically detect porn images?

This is a nudity detector. I haven't tried it. It's the only OSS one I could find.

https://code.google.com/p/nudetech

Effective method to hide email from spam bots

I just have to provide an another answer. I just came up with something fun to play with.

I found out that in many common character tables, the letters @ and a-z reappear more than once. You can map the original characters to the new mappings and make it harder for spam bots to figure out what the e-mail is.

If you loop through the string, and get the character code of a letter, then add 65248 to it and build a html entity based on the number, you come up with a human readable e-mail address.

var str = '[email protected]';
str = str.toLowerCase().replace(/[\.@a-z]/gi, function(match, position, str){
    var num = str.charCodeAt(position);
    return ('&#' + (num + 65248) + ';');
});

Here is a working fiddle: http://jsfiddle.net/EhtSC/8/

You can improve this approach by creating a more complete set of mappings between characters that look the same. But if you copy/paste the e-mail to notepad, for example, you get a lot of boxes.

To overcome some of the user experience issues, I created the e-mail as link. When you click it, it remaps the characters back to their originals.

To improve this, you can create more complex character mappings if you like. If you can find several characters that can be used for example in the place of 'a' why not randomly mapping to those.

Probably not the most secure approach ever but I really had fun playing around with it :D

Short description of the scoping rules?

Where is x found?

x is not found as you haven't defined it. :-) It could be found in code1 (global) or code3 (local) if you put it there.

code2 (class members) aren't visible to code inside methods of the same class — you would usually access them using self. code4/code5 (loops) live in the same scope as code3, so if you wrote to x in there you would be changing the x instance defined in code3, not making a new x.

Python is statically scoped, so if you pass ‘spam’ to another function spam will still have access to globals in the module it came from (defined in code1), and any other containing scopes (see below). code2 members would again be accessed through self.

lambda is no different to def. If you have a lambda used inside a function, it's the same as defining a nested function. In Python 2.2 onwards, nested scopes are available. In this case you can bind x at any level of function nesting and Python will pick up the innermost instance:

x= 0
def fun1():
    x= 1
    def fun2():
        x= 2
        def fun3():
            return x
        return fun3()
    return fun2()
print fun1(), x

2 0

fun3 sees the instance x from the nearest containing scope, which is the function scope associated with fun2. But the other x instances, defined in fun1 and globally, are not affected.

Before nested_scopes — in Python pre-2.1, and in 2.1 unless you specifically ask for the feature using a from-future-import — fun1 and fun2's scopes are not visible to fun3, so S.Lott's answer holds and you would get the global x:

0 0

SMTP error 554

Can be caused by a miss configured SPF record on the senders end.

How do I convert two lists into a dictionary?

A more natural way is to use dictionary comprehension

keys = ('name', 'age', 'food')
values = ('Monty', 42, 'spam')    
dict = {keys[i]: values[i] for i in range(len(keys))}

What does the "no version information available" error from linux dynamic linker mean?

Fwiw, I had this problem when running check_nrpe on a system that had the zenoss monitoring system installed. To add to the confusion, it worked fine as root user but not as zenoss user.

I found out that the zenoss user had an LD_LIBRARY_PATH that caused it to use zenoss libraries, which issue these warnings. Ie:

root@monitoring:$ echo $LD_LIBRARY_PATH

su - zenoss
zenoss@monitoring:/root$ echo $LD_LIBRARY_PATH
/usr/local/zenoss/python/lib:/usr/local/zenoss/mysql/lib:/usr/local/zenoss/zenoss/lib:/usr/local/zenoss/common/lib::
zenoss@monitoring:/root$ /usr/lib/nagios/plugins/check_nrpe -H 192.168.61.61 -p 6969 -c check_mq
/usr/lib/nagios/plugins/check_nrpe: /usr/local/zenoss/common/lib/libcrypto.so.0.9.8: no version information available (required by /usr/lib/libssl.so.0.9.8)
(...)
zenoss@monitoring:/root$ LD_LIBRARY_PATH= /usr/lib/nagios/plugins/check_nrpe -H 192.168.61.61 -p 6969 -c check_mq
(...)

So anyway, what I'm trying to say: check your variables like LD_LIBRARY_PATH, LD_PRELOAD etc as well.

How do you make sure email you send programmatically is not automatically marked as spam?

I always use: https://www.mail-tester.com/

It gives me feedback on the technical part of sending an e-mail. Like SPF-records, DKIM, Spamassassin score and so on. Even though I know what is required, I continuously make errors and mail-tester.com makes it easy to figure out what could be wrong.

Adding local .aar files to Gradle build using "flatDirs" is not working

This is my structure, and how I solve this:

MyProject/app/libs/mylib-1.0.0.aar

MyProject/app/myModulesFolder/myLibXYZ

On build.gradle

from Project/app/myModulesFolder/myLibXYZ

I have put this:

repositories {
   flatDir {
    dirs 'libs', '../../libs'
  }
}
compile (name: 'mylib-1.0.0', ext: 'aar')

Done and working fine, my submodule XYZ depends on somelibrary from main module.

Send File Attachment from Form Using phpMailer and PHP

You'd use $_FILES['uploaded_file']['tmp_name'], which is the path where PHP stored the uploaded file (it's a temporary file, removed automatically by PHP when the script ends, unless you've moved/copied it elsewhere).

Assuming your client-side form and server-side upload settings are correct, there's nothing you have to do to "pull in" the upload. It'll just magically be available in that tmp_name path.

Note that you WILL have to validate that the upload actually succeeded, e.g.

if ($_FILES['uploaded_file']['error'] === UPLOAD_ERR_OK) {
    ... attach file to email ...
}

Otherwise you may try to do an attachment with a damaged/partial/non-existent file.

Bootstrap Modal Backdrop Remaining

just remove class 'fade' from modal

REACT - toggle class onclick

Here is a code I came Up with:

import React, {Component} from "react";
import './header.css'

export default class Header extends Component{
    state = {
        active : false
    };


    toggleMenuSwitch = () => {
        this.setState((state)=>{
            return{
                active: !state.active
            }
        })
    };
    render() {
        //destructuring
        const {active} = this.state;

        let className = 'toggle__sidebar';

        if(active){
            className += ' active';
        }

        return(
            <header className="header">
                <div className="header__wrapper">
                    <div className="header__cell header__cell--logo opened">
                        <a href="#" className="logo">
                            <img src="https://www.nrgcrm.olezzek.id.lv/images/logo.svg" alt=""/>
                        </a>
                        <a href="#" className={className}
                           onClick={ this.toggleMenuSwitch }
                           data-toggle="sidebar">
                            <i></i>
                        </a>
                    </div>
                    <div className="header__cell">

                    </div>
                </div>
            </header>
        );
    };
};

How can I clear console

edit: completely redone question

Simply test what system they are on and send a system command depending on the system. though this will be set at compile time

#ifdef __WIN32
    system("cls");
#else
    system("clear"); // most other systems use this
#endif

This is a completely new method!

Split a string by a delimiter in python

When you have two or more (in the example below there're three) elements in the string, then you can use comma to separate these items:

date, time, event_name = ev.get_text(separator='@').split("@")

After this line of code, the three variables will have values from three parts of the variable ev

So, if the variable ev contains this string and we apply separator '@':

Sa., 23. März@19:00@Klavier + Orchester: SPEZIAL

Then, after split operation the variable

  • date will have value "Sa., 23. März"
  • time will have value "19:00"
  • event_name will have value "Klavier + Orchester: SPEZIAL"

How to print variables in Perl

print "Number of lines: $nids\n";
print "Content: $ids\n";

How did Perl complain? print $ids should work, though you probably want a newline at the end, either explicitly with print as above or implicitly by using say or -l/$\.

If you want to interpolate a variable in a string and have something immediately after it that would looks like part of the variable but isn't, enclose the variable name in {}:

print "foo${ids}bar";

On linux SUSE or RedHat, how do I load Python 2.7

If you can live with 2.6, EPEL has it for RHEL 5 in the python26 package, although you will need to use python2.6 to invoke it since the system will still need python to be 2.4 in order to run.

Padding zeros to the left in postgreSQL

The to_char() function is there to format numbers:

select to_char(column_1, 'fm000') as column_2
from some_table;

The fm prefix ("fill mode") avoids leading spaces in the resulting varchar. The 000 simply defines the number of digits you want to have.

psql (9.3.5)
Type "help" for help.

postgres=> with sample_numbers (nr) as (
postgres(>     values (1),(11),(100)
postgres(> )
postgres-> select to_char(nr, 'fm000')
postgres-> from sample_numbers;
 to_char
---------
 001
 011
 100
(3 rows)

postgres=>

For more details on the format picture, please see the manual:
http://www.postgresql.org/docs/current/static/functions-formatting.html

Calculate time difference in Windows batch file

Here is my attempt to measure time difference in batch.

It respects the regional format of %TIME% without taking any assumptions on type of characters for time and decimal separators.

The code is commented but I will also describe it here.

It is flexible so it can also be used to normalize non-standard time values as well

The main function :timediff

:: timediff
:: Input and output format is the same format as %TIME%
:: If EndTime is less than StartTime then:
::   EndTime will be treated as a time in the next day
::   in that case, function measures time difference between a maximum distance of 24 hours minus 1 centisecond
::   time elements can have values greater than their standard maximum value ex: 12:247:853.5214
::   provided than the total represented time does not exceed 24*360000 centiseconds
::   otherwise the result will not be meaningful.
:: If EndTime is greater than or equals to StartTime then:
::   No formal limitation applies to the value of elements,
::   except that total represented time can not exceed 2147483647 centiseconds.

:timediff <outDiff> <inStartTime> <inEndTime>
(
    setlocal EnableDelayedExpansion
    set "Input=!%~2! !%~3!"
    for /F "tokens=1,3 delims=0123456789 " %%A in ("!Input!") do set "time.delims=%%A%%B "
)
for /F "tokens=1-8 delims=%time.delims%" %%a in ("%Input%") do (
    for %%A in ("@h1=%%a" "@m1=%%b" "@s1=%%c" "@c1=%%d" "@h2=%%e" "@m2=%%f" "@s2=%%g" "@c2=%%h") do (
        for /F "tokens=1,2 delims==" %%A in ("%%~A") do (
            for /F "tokens=* delims=0" %%B in ("%%B") do set "%%A=%%B"
        )
    )
    set /a "@d=(@h2-@h1)*360000+(@m2-@m1)*6000+(@s2-@s1)*100+(@c2-@c1), @sign=(@d>>31)&1, @d+=(@sign*24*360000), @h=(@d/360000), @d%%=360000, @m=@d/6000, @d%%=6000, @s=@d/100, @c=@d%%100"
)
(
    if %@h% LEQ 9 set "@h=0%@h%"
    if %@m% LEQ 9 set "@m=0%@m%"
    if %@s% LEQ 9 set "@s=0%@s%"
    if %@c% LEQ 9 set "@c=0%@c%"
)
(
    endlocal
    set "%~1=%@h%%time.delims:~0,1%%@m%%time.delims:~0,1%%@s%%time.delims:~1,1%%@c%"
    exit /b
)

Example:

@echo off
setlocal EnableExtensions
set "TIME="

set "Start=%TIME%"
REM Do some stuff here...
set "End=%TIME%"

call :timediff Elapsed Start End
echo Elapsed Time: %Elapsed%

pause
exit /b

:: put the :timediff function here


Explanation of the :timediff function:

function prototype  :timediff <outDiff> <inStartTime> <inEndTime>

Input and output format is the same format as %TIME%

It takes 3 parameters from left to right:

Param1: Name of the environment variable to save the result to.
Param2: Name of the environment variable to be passed to the function containing StartTime string
Param3: Name of the environment variable to be passed to the function containing EndTime string

If EndTime is less than StartTime then:

    EndTime will be treated as a time in the next day
    in that case, the function measures time difference between a maximum distance of 24 hours minus 1 centisecond
    time elements can have values greater than their standard maximum value ex: 12:247:853.5214
    provided than the total represented time does not exceed 24*360000 centiseconds or (24:00:00.00) otherwise the result will not be meaningful.
If EndTime is greater than or equals to StartTime then:
    No formal limitation applies to the value of elements,
    except that total represented time can not exceed 2147483647 centiseconds.


More examples with literal and non-standard time values

    Literal example with EndTime less than StartTime:
@echo off
setlocal EnableExtensions

set "start=23:57:33,12"
set "end=00:02:19,41"

call :timediff dif start end

echo Start Time: %start%
echo End Time:   %end%
echo,
echo Difference: %dif%
echo,

pause
exit /b

:: put the :timediff function here
    Output:
Start Time: 23:57:33,12
End Time:   00:02:19,41

Difference: 00:04:46,29
    Normalize non-standard time:
@echo off
setlocal EnableExtensions

set "start=00:00:00.00"
set "end=27:2457:433.85935"

call :timediff normalized start end

echo,
echo %end% is equivalent to %normalized%
echo,

pause
exit /b

:: put the :timediff function here
    Output:

27:2457:433.85935 is equivalent to 68:18:32.35

    Last bonus example:
@echo off
setlocal EnableExtensions

set "start=00:00:00.00"
set "end=00:00:00.2147483647"

call :timediff normalized start end

echo,
echo 2147483647 centiseconds equals to %normalized%
echo,

pause
exit /b

:: put the :timediff function here
    Output:

2147483647 centiseconds equals to 5965:13:56.47

Remove Safari/Chrome textinput/textarea glow

This effect can occur on non-input elements, too. I've found the following works as a more general solution

:focus {
  outline-color: transparent;
  outline-style: none;
}

Update: You may not have to use the :focus selector. If you have an element, say <div id="mydiv">stuff</div>, and you were getting the outer glow on this div element, just apply like normal:

#mydiv {
  outline-color: transparent;
  outline-style: none;
}

Twitter bootstrap float div right

<p class="pull-left">Text left</p>
<p class="text-right">Text right in same line</p>

This work for me.

edit: An example with your snippet:

_x000D_
_x000D_
@import url('https://unpkg.com/[email protected]/dist/css/bootstrap.css');_x000D_
 .container {_x000D_
    margin-top: 10px;_x000D_
}
_x000D_
<div class="container">_x000D_
    <div class="row-fluid">_x000D_
        <div class="span6 pull-left">_x000D_
            <p>Text left</p>_x000D_
        </div>_x000D_
        <div class="span6 text-right">_x000D_
            <p>text right</p>_x000D_
        </div>_x000D_
    </div>_x000D_
</div>
_x000D_
_x000D_
_x000D_

How to filter data in dataview

Eg:

Datatable newTable =  new DataTable();

            foreach(string s1 in list)
            {
                if (s1 != string.Empty) {
                    dvProducts.RowFilter = "(CODE like '" + serachText + "*') AND (CODE <> '" + s1 + "')";
                    foreach(DataRow dr in dvProducts.ToTable().Rows)
                    {
                       newTable.ImportRow(dr);
                    }
                }
            }
ListView1.DataSource = newTable;
ListView1.DataBind();

fopen deprecated warning

Well you could add a:

#pragma warning (disable : 4996)

before you use fopen, but have you considered using fopen_s as the warning suggests? It returns an error code allowing you to check the result of the function call.

The problem with just disabling deprecated function warnings is that Microsoft may remove the function in question in a later version of the CRT, breaking your code (as stated below in the comments, this won't happen in this instance with fopen because it's part of the C & C++ ISO standards).

How to search in commit messages using command line?

git log --grep=<pattern>
    Limit the commits output to ones with log message that matches the 
    specified pattern (regular expression).

--git help log

Set focus on <input> element

Modify the show search method like this

showSearch(){
  this.show = !this.show;  
  setTimeout(()=>{ // this will make the execution after the above boolean has changed
    this.searchElement.nativeElement.focus();
  },0);  
}

Traits vs. interfaces

If you know English and know what trait means, it is exactly what the name says. It is a class-less pack of methods and properties you attach to existing classes by typing use.

Basically, you could compare it to a single variable. Closures functions can use these variables from outside of the scope and that way they have the value inside. They are powerful and can be used in everything. Same happens to traits if they are being used.

Detecting TCP Client Disconnect

TCP has "open" and a "close" procedures in the protocol. Once "opened", a connection is held until "closed". But there are lots of things that can stop the data flow abnormally. That being said, the techniques to determine if it is possible to use a link are highly dependent on the layers of software between the protocol and the application program. The ones mentioned above focus on a programmer attempting to use a socket in a non-invasive way (read or write 0 bytes) are perhaps the most common. Some layers in libraries will supply the "polling" for a programmer. For example Win32 asych (delayed) calls can Start a read that will return with no errors and 0 bytes to signal a socket that cannot be read any more (presumably a TCP FIN procedure). Other environments might use "events" as defined in their wrapping layers. There is no single answer to this question. The mechanism to detect when a socket cannot be used and should be closed depends on the wrappers supplied in the libraries. It is also worthy to note that sockets themselves can be reused by layers below an application library so it is wise to figure out how your environment deals with the Berkley Sockets interface.

clear data inside text file in c++

If you set the trunc flag.

#include<fstream>

using namespace std;

fstream ofs;

int main(){
ofs.open("test.txt", ios::out | ios::trunc);
ofs<<"Your content here";
ofs.close(); //Using microsoft incremental linker version 14
}

I tested this thouroughly for my own needs in a common programming situation I had. Definitely be sure to preform the ".close();" operation. If you don't do this there is no telling whether or not you you trunc or just app to the begging of the file. Depending on the file type you might just append over the file which depending on your needs may not fullfill its purpose. Be sure to call ".close();" explicity on the fstream you are trying to replace.

How to read values from the querystring with ASP.NET Core?

  1. Startup.cs add this service services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
  2. Your view add inject @inject Microsoft.AspNetCore.Http.IHttpContextAccessor HttpContextAccessor
  3. get your value

Code

@inject Microsoft.AspNetCore.Http.IHttpContextAccessor HttpContextAccessor
@{
    var id = HttpContextAccessor.HttpContext.Request.RouteValues["id"];

    if (id != null)
    {
        // parameter exist in your URL 
    }

    string navigation = await Navigation.WebNavigation(activeTab);
}

Round float to x decimals?

Default rounding in python and numpy:

In: [round(i) for i in np.arange(10) + .5]
Out: [0, 2, 2, 4, 4, 6, 6, 8, 8, 10]

I used this to get integer rounding to be applied to a pandas series:

import decimal

and use this line to set the rounding to "half up" a.k.a rounding as taught in school: decimal.getcontext().rounding = decimal.ROUND_HALF_UP

Finally I made this function to apply it to a pandas series object

def roundint(value):
    return value.apply(lambda x: int(decimal.Decimal(x).to_integral_value()))

So now you can do roundint(df.columnname)

And for numbers:

In: [int(decimal.Decimal(i).to_integral_value()) for i in np.arange(10) + .5]
Out: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

Credit: kares

text-overflow: ellipsis not working

You need to have CSS overflow, width (or max-width), display, and white-space.

http://jsfiddle.net/HerrSerker/kaJ3L/1/

span {
    border: solid 2px blue;
    white-space: nowrap;
    text-overflow: ellipsis;
    width: 100px;
    display: block;
    overflow: hidden
}

_x000D_
_x000D_
body {
    overflow: hidden;
}

span {
    border: solid 2px blue;
    white-space: nowrap;
    text-overflow: ellipsis;
    width: 100px;
    display: block;
    overflow: hidden
}
_x000D_
<span>Test test test test test test</span>
_x000D_
_x000D_
_x000D_


Addendum If you want an overview of techniques to do line clamping (Multiline Overflow Ellipses), look at this CSS-Tricks page: https://css-tricks.com/line-clampin/

Addendum2 (May 2019)
As this link claims, Firefox 68 will support -webkit-line-clamp (!)

Removing leading and trailing spaces from a string

neat and clean

 void trimLeftTrailingSpaces(string &input) {
        input.erase(input.begin(), find_if(input.begin(), input.end(), [](int ch) {
            return !isspace(ch);
        }));
    }

    void trimRightTrailingSpaces(string &input) {
        input.erase(find_if(input.rbegin(), input.rend(), [](int ch) {
            return !isspace(ch);
        }).base(), input.end());
    }

Git merge errors

as suggested in git status,

Unmerged paths:                                                                                                                                
(use "git add <file>..." to mark resolution)                                                                                                 

    both modified:   a.jl                                  
    both modified:   b.jl

I used git add to finish the merging, then git checkout works fine.

SQLite Reset Primary Key Field

As an alternate option, if you have the Sqlite Database Browser and are more inclined to a GUI solution, you can edit the sqlite_sequence table where field name is the name of your table. Double click the cell for the field seq and change the value to 0 in the dialogue box that pops up.

Get dates from a week number in T-SQL

I just incorporated the SELECT with a CASE statement (For my situation Monday marked the first day of the week, and didn't want to deal with the SET DATEFIRST command:

CASE DATEPART(dw,<YourDateTimeField>)
   WHEN 1 THEN CONVERT(char(10), DATEADD(DD, -6, <YourDateTimeField>),126) +  ' to ' + CONVERT(char(10), <YourDateTimeField>,126)
   WHEN 2 THEN CONVERT(char(10), <YourDateTimeField>,126) +  ' to ' + CONVERT(char(10), DATEADD(DD, 6, <YourDateTimeField>),126)
   WHEN 3 THEN CONVERT(char(10), DATEADD(DD, -1, <YourDateTimeField>),126) +  ' to ' + CONVERT(char(10), DATEADD(DD, 5, <YourDateTimeField>),126)
   WHEN 4 THEN CONVERT(char(10), DATEADD(DD, -2, <YourDateTimeField>),126) +  ' to ' + CONVERT(char(10), DATEADD(DD, 4, <YourDateTimeField>),126)
   WHEN 5 THEN CONVERT(char(10), DATEADD(DD, -3, <YourDateTimeField>),126) +  ' to ' + CONVERT(char(10), DATEADD(DD, 3, <YourDateTimeField>),126)
   WHEN 6 THEN CONVERT(char(10), DATEADD(DD, -4, <YourDateTimeField>),126) +  ' to ' + CONVERT(char(10), DATEADD(DD, 2, <YourDateTimeField>),126)
   WHEN 7 THEN CONVERT(char(10), DATEADD(DD, -5, <YourDateTimeField>),126) +  ' to ' + CONVERT(char(10), DATEADD(DD, 1, <YourDateTimeField>),126)
   ELSE 'UNK'
END AS Week_Range

Android Calling JavaScript functions in WebView

From kitkat onwards use evaluateJavascript method instead loadUrl to call the javascript functions like below

    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT) {
        webView.evaluateJavascript("enable();", null);
    } else {
        webView.loadUrl("javascript:enable();");
    }

Wordpress 403/404 Errors: You don't have permission to access /wp-admin/themes.php on this server

Just to follow up, problem solved! I mentioned mod_sec settings for my server as being the possible culprit as suggested and they were able to fix this issue. Here's what the tech agent said to tell them when you go to support:

Just let them know you need the rule 340163 whitelisted for domain.com as its hitting a mod_sec rule.

Apparently you will need to do this for each domain that is having the issue, but it works. Thanks for all the suggestions everyone!

How to launch jQuery Fancybox on page load?

In case if you don't have button to click. I mean if you want to open it on ajax response then it would be like this :

$.fancybox({
      href: '#ID',
      padding   : 23,
      maxWidth  : 690,
      maxHeight : 345
});

RESTful URL design for search

I use two approaches to implement searches.

1) Simplest case, to query associated elements, and for navigation.

    /cars?q.garage.id.eq=1

This means, query cars that have garage ID equal to 1.

It is also possible to create more complex searches:

    /cars?q.garage.street.eq=FirstStreet&q.color.ne=red&offset=300&max=100

Cars in all garages in FirstStreet that are not red (3rd page, 100 elements per page).

2) Complex queries are considered as regular resources that are created and can be recovered.

    POST /searches  => Create
    GET  /searches/1  => Recover search
    GET  /searches/1?offset=300&max=100  => pagination in search

The POST body for search creation is as follows:

    {  
       "$class":"test.Car",
       "$q":{
          "$eq" : { "color" : "red" },
          "garage" : {
             "$ne" : { "street" : "FirstStreet" }
          }
       }
    }

It is based in Grails (criteria DSL): http://grails.org/doc/2.4.3/ref/Domain%20Classes/createCriteria.html

Rotate an image in image source in html

This CSS seems to work in Safari and Chrome:

div#div2
{
-webkit-transform:rotate(90deg); /* Chrome, Safari, Opera */
transform:rotate(90deg); /* Standard syntax */
}

and in the body:

<div id="div2"><img src="image.jpg"  ></div>

But this (and the .rotate90 example above) pushes the rotated image higher up on the page than if it were un-rotated. Not sure how to control placement of the image relative to text or other rotated images.

Set cURL to use local virtual hosts

It seems that this is not an uncommon problem.

Check this first.

If that doesn't help, you can install a local DNS server on Windows, such as this. Configure Windows to use localhost as the DNS server. This server can be configured to be authoritative for whatever fake domains you need, and to forward requests on to the real DNS servers for all other requests.

I personally think this is a bit over the top, and can't see why the hosts file wouldn't work. But it should solve the problem you're having. Make sure you set up your normal DNS servers as forwarders as well.

Docker error : no space left on device

I run the below commands.

There is no need to rebuilt images afterwards.

docker rm $(docker ps -qf 'status=exited')
docker rmi $(docker images -qf "dangling=true")
docker volume rm $(docker volume ls -qf dangling=true)

These remove exited/dangling containers and dangling volumes.

CSS Background Image Not Displaying

According to your CSS file path, I will suppose it is at the same directory with your HTML page, you have to change the url as follows:

body { background: url(img/debut_dark.png) repeat 0 0; }

Postgresql Windows, is there a default password?

Try this:

Open PgAdmin -> Files -> Open pgpass.conf

You would get the path of pgpass.conf at the bottom of the window. Go to that location and open this file, you can find your password there.

Reference

If the above does not work, you may consider trying this:

 1. edit pg_hba.conf to allow trust authorization temporarily
 2. Reload the config file (pg_ctl reload)
 3. Connect and issue ALTER ROLE / PASSWORD to set the new password
 4. edit pg_hba.conf again and restore the previous settings
 5. Reload the config file again

Factorial using Recursion in Java

public class Factorial2 {
    public static long factorial(long x) {
        if (x < 0) 
            throw new IllegalArgumentException("x must be >= 0");
        if (x <= 1) 
            return 1;  // Stop recursing here
        else 
           return x * factorial(x-1);  // Recurse by calling ourselves
    }
}

writing integer values to a file using out.write()

i = Your_int_value

Write bytes value like this for example:

the_file.write(i.to_bytes(2,"little"))

Depend of you int value size and the bit order your prefer

Using jQuery UI sortable with HTML tables

You can call sortable on a <tbody> instead of on the individual rows.

<table>
    <tbody>
        <tr> 
            <td>1</td>
            <td>2</td>
        </tr>
        <tr>
            <td>3</td>
            <td>4</td> 
        </tr>
        <tr>
            <td>5</td>
            <td>6</td>
        </tr>  
    </tbody>    
</table>?

<script>
    $('tbody').sortable();
</script> 

_x000D_
_x000D_
$(function() {_x000D_
  $( "tbody" ).sortable();_x000D_
});
_x000D_
 _x000D_
table {_x000D_
    border-spacing: collapse;_x000D_
    border-spacing: 0;_x000D_
}_x000D_
td {_x000D_
    width: 50px;_x000D_
    height: 25px;_x000D_
    border: 1px solid black;_x000D_
}
_x000D_
 _x000D_
_x000D_
<link href="//code.jquery.com/ui/1.11.1/themes/smoothness/jquery-ui.css" rel="stylesheet">_x000D_
<script src="//code.jquery.com/jquery-1.11.1.js"></script>_x000D_
<script src="//code.jquery.com/ui/1.11.1/jquery-ui.js"></script>_x000D_
_x000D_
<table>_x000D_
    <tbody>_x000D_
        <tr>_x000D_
            <td>1</td>_x000D_
            <td>2</td>_x000D_
        </tr>_x000D_
        <tr>_x000D_
            <td>3</td>_x000D_
            <td>4</td>_x000D_
        </tr>_x000D_
        <tr> _x000D_
            <td>5</td>_x000D_
            <td>6</td>_x000D_
        </tr>_x000D_
        <tr>_x000D_
            <td>7</td>_x000D_
            <td>8</td>_x000D_
        </tr>_x000D_
        <tr>_x000D_
            <td>9</td> _x000D_
            <td>10</td>_x000D_
        </tr>  _x000D_
    </tbody>    _x000D_
</table>
_x000D_
_x000D_
_x000D_

How can I run an external command asynchronously from Python?

If you want to run many processes in parallel and then handle them when they yield results, you can use polling like in the following:

from subprocess import Popen, PIPE
import time

running_procs = [
    Popen(['/usr/bin/my_cmd', '-i %s' % path], stdout=PIPE, stderr=PIPE)
    for path in '/tmp/file0 /tmp/file1 /tmp/file2'.split()]

while running_procs:
    for proc in running_procs:
        retcode = proc.poll()
        if retcode is not None: # Process finished.
            running_procs.remove(proc)
            break
        else: # No process is done, wait a bit and check again.
            time.sleep(.1)
            continue

    # Here, `proc` has finished with return code `retcode`
    if retcode != 0:
        """Error handling."""
    handle_results(proc.stdout)

The control flow there is a little bit convoluted because I'm trying to make it small -- you can refactor to your taste. :-)

This has the advantage of servicing the early-finishing requests first. If you call communicate on the first running process and that turns out to run the longest, the other running processes will have been sitting there idle when you could have been handling their results.

How can I get the values of data attributes in JavaScript code?

Modern browsers accepts HTML and SVG DOMnode.dataset

Using pure Javascript's DOM-node dataset property.

It is an old Javascript standard for HTML elements (since Chorme 8 and Firefox 6) but new for SVG (since year 2017 with Chorme 55.x and Firefox 51)... It is not a problem for SVG because in nowadays (2019) the version's usage share is dominated by modern browsers.

The values of dataset's key-values are pure strings, but a good practice is to adopt JSON string format for non-string datatypes, to parse it by JSON.parse().

Using the dataset property in any context

Code snippet to get and set key-value datasets at HTML and SVG contexts.

_x000D_
_x000D_
console.log("-- GET values --")_x000D_
var x = document.getElementById('html_example').dataset;_x000D_
console.log("s:", x.s );_x000D_
for (var i of JSON.parse(x.list)) console.log("list_i:",i)_x000D_
_x000D_
var y = document.getElementById('g1').dataset;_x000D_
console.log("s:", y.s );_x000D_
for (var i of JSON.parse(y.list)) console.log("list_i:",i)_x000D_
_x000D_
console.log("-- SET values --");_x000D_
y.s="BYE!"; y.list="null";_x000D_
console.log( document.getElementById('svg_example').innerHTML )
_x000D_
<p id="html_example" data-list="[1,2,3]" data-s="Hello123">Hello!</p>_x000D_
<svg id="svg_example">_x000D_
  <g id="g1" data-list="[4,5,6]" data-s="Hello456 SVG"></g>_x000D_
</svg>
_x000D_
_x000D_
_x000D_

Which JRE am I using?

The following command will tell you a lot of information about your java version, including the vendor:

java -XshowSettings:properties -version

It works on Windows, Mac, and Linux.

Where is shared_ptr?

for VS2008 with feature pack update, shared_ptr can be found under namespace std::tr1.

std::tr1::shared_ptr<int> MyIntSmartPtr = new int;

of

if you had boost installation path (for example @ C:\Program Files\Boost\boost_1_40_0) added to your IDE settings:

#include <boost/shared_ptr.hpp>

Callback functions in Java

A method is not (yet) a first-class object in Java; you can't pass a function pointer as a callback. Instead, create an object (which usually implements an interface) that contains the method you need and pass that.

Proposals for closures in Java—which would provide the behavior you are looking for—have been made, but none will be included in the upcoming Java 7 release.

ng-change not working on a text input

Maybe you can try something like this:

Using a directive

directive('watchChange', function() {
    return {
        scope: {
            onchange: '&watchChange'
        },
        link: function(scope, element, attrs) {
            element.on('input', function() {
                scope.onchange();
            });
        }
    };
});

http://jsfiddle.net/H2EAB/

Creating virtual directories in IIS express

In answer to the further question -

"is there anyway to apply this within the Visual Studio project? In a multi-developer environment, if someone else check's out the code on their machine, then their local IIS Express wouldn't be configured with the virtual directory and cause runtime errors wouldn't it?"

I never found a consistant answer to this anywhere but then figured out you could do it with a post build event using the XmlPoke task in the project file for the website -

<Target Name="AfterBuild">
    <!-- Get the local directory root (and strip off the website name) -->
    <PropertyGroup>
        <LocalTarget>$(ProjectDir.Replace('MyWebSite\', ''))</LocalTarget>
    </PropertyGroup>

    <!-- Now change the virtual directories as you need to -->
    <XmlPoke XmlInputPath="..\..\Source\Assemblies\MyWebSite\.vs\MyWebSite\config\applicationhost.config" 
        Value="$(LocalTarget)AnotherVirtual" 
        Query="/configuration/system.applicationHost/sites/site[@name='MyWebSite']/application[@path='/']/virtualDirectory[@path='/AnotherVirtual']/@physicalPath"/>
</Target>

You can use this technique to repoint anything in the file before IISExpress starts up. This would allow you to initially force an applicationHost.config file into GIT (assuming it is ignored by gitignore) then subsequently repoint all the paths at build time. GIT will ignore any changes to the file so it's now easy to share them around.

In answer to the futher question about adding other applications under one site:

You can create the site in your application hosts file just like the one on your server. For example:

  <site name="MyWebSite" id="2">
    <application path="/" applicationPool="Clr4IntegratedAppPool">
      <virtualDirectory path="/" physicalPath="C:\GIT\MyWebSite\Main" />
      <virtualDirectory path="/SharedContent" physicalPath="C:\GIT\SharedContent" />
      <virtualDirectory path="/ServerResources" physicalPath="C:\GIT\ServerResources" />
    </application>
    <application path="/AppSubSite" applicationPool="Clr4IntegratedAppPool">
      <virtualDirectory path="/" physicalPath="C:\GIT\AppSubSite\" />
      <virtualDirectory path="/SharedContent" physicalPath="C:\GIT\SharedContent" />
      <virtualDirectory path="/ServerResources" physicalPath="C:\GIT\ServerResources" />
    </application>
    <bindings>
      <binding protocol="http" bindingInformation="*:4076:localhost" />
    </bindings>
  </site>

Then use the above technique to change the folder locations at build time.

Formatting a field using ToText in a Crystal Reports formula field

I think you are looking for ToText(CCur(@Price}/{ValuationReport.YestPrice}*100-100))

You can use CCur to convert numbers or string to Curency formats. CCur(number) or CCur(string)


I think this may be what you are looking for,

Replace (ToText(CCur({field})),"$" , "") that will give the parentheses for negative numbers

It is a little hacky, but I'm not sure CR is very kind in the ways of formatting

Removing rounded corners from a <select> element in Chrome/Webkit

For some reason it's actually affected by the color of the border??? When you use the standard color the corners stay rounded but if you change the color even slightly the rounding goes away.

select.regularcolor {
    border-color: rgb(169, 169, 169);
}

select.offcolor {
    border-color: rgb(170, 170, 170);
}

https://jsfiddle.net/hLg70o70/2/

How to set entire application in portrait mode only?

Similar to Graham Borland answer...but it seems you dont have to create Application class if you dont want...just create a Base Activity in your project

public class BaseActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_base);
    setRequestedOrientation (ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

}

And extend this class instead of AppCompatActivity where you want to use Potrait Mode

public class your_activity extends BaseActivity {}

Difference between \b and \B in regex

The confusion stems from your thinking \b matches spaces (probably because "b" suggests "blank").

\b matches the empty string at the beginning or end of a word. \B matches the empty string not at the beginning or end of a word. The key here is that "-" is not a part of a word. So <left>-<right> matches \b-\b because there are word boundaries on either side of the -. On the other hand for <left> - <right> (note the spaces), there are not word boundaries on either side of the dash. The word boundaries are one space further left and right.

On the other hand, when searching for \bcat\b word boundaries behave more intuitively, and it matches " cat " as expected.

Javascript loading CSV file into an array

If your not overly worried about the size of the file then it may be easier for you to store the data as a JS object in another file and import it in your . Either synchronously or asynchronously using the syntax <script src="countries.js" async></script>. Saves on you needing to import the file and parse it.

However, i can see why you wouldnt want to rewrite 10000 entries so here's a basic object orientated csv parser i wrote.

function requestCSV(f,c){return new CSVAJAX(f,c);};
function CSVAJAX(filepath,callback)
{
    this.request = new XMLHttpRequest();
    this.request.timeout = 10000;
    this.request.open("GET", filepath, true);
    this.request.parent = this;
    this.callback = callback;
    this.request.onload = function() 
    {
        var d = this.response.split('\n'); /*1st separator*/
        var i = d.length;
        while(i--)
        {
            if(d[i] !== "")
                d[i] = d[i].split(','); /*2nd separator*/
            else
                d.splice(i,1);
        }
        this.parent.response = d;
        if(typeof this.parent.callback !== "undefined")
            this.parent.callback(d);
    };
    this.request.send();
};

Which can be used like this;

var foo = requestCSV("csvfile.csv",drawlines(lines)); 

The first parameter is the file, relative to the position of your html file in this case. The second parameter is an optional callback function the runs when the file has been completely loaded.

If your file has non-separating commmas then it wont get on with this, as it just creates 2d arrays by chopping at returns and commas. You might want to look into regexp if you need that functionality.

//THIS works 

"1234","ABCD" \n
"!@£$" \n

//Gives you 
[
 [
  1234,
  'ABCD'
 ],
 [
  '!@£$'
 ]
]

//This DOESN'T!

"12,34","AB,CD" \n
"!@,£$" \n

//Gives you

[
 [
  '"12',
  '34"',
  '"AB',
  'CD'
 ]
 [
  '"!@',
  '£$'
 ]
]

If your not used to the OO methods; they create a new object (like a number, string, array) with their own local functions and variables via a 'constructor' function. Very handy in certain situations. This function could be used to load 10 different files with different callbacks all at the same time(depending on your level of csv love! )

Show or hide element in React

Simple hide/show example with React Hooks: (srry about no fiddle)

const Example = () => {

  const [show, setShow] = useState(false);

  return (
    <div>
      <p>Show state: {show}</p>
      {show ? (
        <p>You can see me!</p>
      ) : null}
      <button onClick={() => setShow(!show)}>
    </div>
  );

};

export default Example;

Android Recyclerview vs ListView with Viewholder

I used a ListView with Glide image loader, having memory growth. Then I replaced the ListView with a RecyclerView. It is not only more difficult in coding, but also leads to a more memory usage than a ListView. At least, in my project.

In another activity I used a complex list with EditText's. In some of them an input method may vary, also a TextWatcher can be applied. If I used a ViewHolder, how could I replace a TextWatcher during scrolling? So, I used a ListView without a ViewHolder, and it works.

Streaming video from Android camera to server

I'm looking into this as well, and while I don't have a good solution for you I did manage to dig up SIPDroid's video code:

http://code.google.com/p/sipdroid/source/browse/trunk/src/org/sipdroid/sipua/ui/VideoCamera.java

How do you get the currently selected <option> in a <select> via JavaScript?

Using the selectedOptions property:

var yourSelect = document.getElementById("your-select-id");
alert(yourSelect.selectedOptions[0].value);

It works in all browsers except Internet Explorer.

How do I use boolean variables in Perl?

I came across a tutorial which have a well explaination about What values are true and false in Perl. It state that:

Following scalar values are considered false:

  • undef - the undefined value
  • 0 the number 0, even if you write it as 000 or 0.0
  • '' the empty string.
  • '0' the string that contains a single 0 digit.

All other scalar values, including the following are true:

  • 1 any non-0 number
  • ' ' the string with a space in it
  • '00' two or more 0 characters in a string
  • "0\n" a 0 followed by a newline
  • 'true'
  • 'false' yes, even the string 'false' evaluates to true.

There is another good tutorial which explain about Perl true and false.

How can I format the output of a bash command in neat columns

Found this by searching for "linux output formatted columns".

http://www.unix.com/shell-programming-scripting/117543-formatting-output-columns.html

For your needs, it's like:

awk '{ printf "%-20s %-40s\n", $1, $2}'

Why must wait() always be in synchronized block

as per docs:

The current thread must own this object's monitor. The thread releases ownership of this monitor.

wait() method simply means it releases the lock on the object. So the object will be locked only within the synchronized block/method. If thread is outside the sync block means it's not locked, if it's not locked then what would you release on the object?

How to get the current time in milliseconds from C in Linux?

Use gettimeofday() to get the time in seconds and microseconds. Combining and rounding to milliseconds is left as an exercise.

Using varchar(MAX) vs TEXT on SQL Server

The VARCHAR(MAX) type is a replacement for TEXT. The basic difference is that a TEXT type will always store the data in a blob whereas the VARCHAR(MAX) type will attempt to store the data directly in the row unless it exceeds the 8k limitation and at that point it stores it in a blob.

Using the LIKE statement is identical between the two datatypes. The additional functionality VARCHAR(MAX) gives you is that it is also can be used with = and GROUP BY as any other VARCHAR column can be. However, if you do have a lot of data you will have a huge performance issue using these methods.

In regard to if you should use LIKE to search, or if you should use Full Text Indexing and CONTAINS. This question is the same regardless of VARCHAR(MAX) or TEXT.

If you are searching large amounts of text and performance is key then you should use a Full Text Index.

LIKE is simpler to implement and is often suitable for small amounts of data, but it has extremely poor performance with large data due to its inability to use an index.

How To Pass GET Parameters To Laravel From With GET Method ?

The simplest way is just to accept the incoming request, and pull out the variables you want in the Controller:

Route::get('search', ['as' => 'search', 'uses' => 'SearchController@search']);

and then in SearchController@search:

class SearchController extends BaseController {

    public function search()
    {
        $category = Input::get('category', 'default category');
        $term = Input::get('term', false);

        // do things with them...
    }
}

Usefully, you can set defaults in Input::get() in case nothing is passed to your Controller's action.

As joe_archer says, it's not necessary to put these terms into the URL, and it might be better as a POST (in which case you should update your call to Form::open() and also your search route in routes.php - Input::get() remains the same)

What's NSLocalizedString equivalent in Swift?

I use next solution:

1) create extension:

extension String {
    var localized: String {
        return NSLocalizedString(self, tableName: nil, bundle: Bundle.main, value: "", comment: "")
    }
}

2) in Localizable.strings file:

"Hi" = "??????";

3) example of use:

myLabel.text = "Hi".localized

enjoy! ;)

--upd:--

for case with comments you can use this solution:

1) Extension:

extension String {
    func localized(withComment:String) -> String {
        return NSLocalizedString(self, tableName: nil, bundle: Bundle.main, value: "", comment: withComment)
    }
}

2) in .strings file:

/* with !!! */
"Hi" = "??????!!!";

3) using:

myLabel.text = "Hi".localized(withComment: "with !!!")

Why can't I use a list as a dict key in python?

The simple answer to your question is that the class list does not implement the method hash which is required for any object which wishes to be used as a key in a dictionary. However the reason why hash is not implemented the same way it is in say the tuple class (based on the content of the container) is because a list is mutable so editing the list would require the hash to be recalculated which may mean the list in now located in the wrong bucket within the underling hash table. Note that since you cannot modify a tuple (immutable) it doesn't run into this problem.

As a side note, the actual implementation of the dictobjects lookup is based on Algorithm D from Knuth Vol. 3, Sec. 6.4. If you have that book available to you it might be a worthwhile read, in addition if you're really, really interested you may like to take a peek at the developer comments on the actual implementation of dictobject here. It goes into great detail as to exactly how it works. There is also a python lecture on the implementation of dictionaries which you may be interested in. They go through the definition of a key and what a hash is in the first few minutes.

How to convert buffered image to image and vice-versa?

Just an information: let us all remember that the Image class is actually an abstract class and referencing a variable of this with a BufferedImage only stores or returns any Object's memory adress.

Also, wherefore, static java.awt.image.imageIO's read() method returns a BufferedImage object, therefore no doubt that using operator/expression instanceof BufferedImage on that object will return true.

In fact, being abstract, Image class has such method signatures as:

  1. public abstract Graphics getGraphics()
  2. public abstract ImageProducer getSource()

among others.

I emphasize, an actual Image variable only holds memory adress of a concrete Image-subclass object, almost like pointers in C, C++, Ada, etc.

If you're introduced or advanced in those languages, and also of Java interface instances like Runnable, javax.sound.Clip, AWT's Shape, etc.. . Take note that Image has: public abstract Image getScaledInstance(...) - you get the point. (Of course, scaling in 2D Graphics programming is interchangeable to resizing, for which precision is desirable).

But in an impossible case when herein ImageIO method return ! (instanceof BufferedImage) just create a new BufferedImage object with this ImgObjNotInstncfBufImg apassed to one of its constructor argument. Then, at (rational) will manipulate this in the logic of your code.

Anyways, the Affine Transform class is appropriate for transforming Shapes and Images to thier scaled, rotated, relocated, etc forms, so I recommend you to study about using an "affine transform".

Take note that you can manipulate the actual pixels in such Image's Raster - well another technical 2D Graphics jargon which must be referenced from a technical glossary - which perhaps a excercised skill in Java ways of binary blitwise operations will be needed, in types of Image buffers that store individual color attributes in a compact in of 32-bytes - 7-bits each for the alpha and RGB values.

I suspect your gonna use it in layering images. So, FINALLY, the rational is that you only reference BufferedImage with the abstract Image, and if ever your Image object isn't a BufferedImage one yet, then you can just make an image out of this related-but-non-BufferedImage-instance without having to worry about any conversion, casting, autoboxing or whatever; manipulating a BufferedImage really means manipulating also the underlying root Image data-bearing object that it points to.

Okay, finished; I think I certainly extracted and splintered out what deadlock you may have thought you are facing to. As I have said abstract classes in java, and also interfaces, are very much the equivaleng of the low-level, more-close-to-hardware operators called pointers in other languages.

How to get the query string by javascript?

You can use this Javascript :

function getParameterByName(name) {
    var match = RegExp('[?&]' + name + '=([^&]*)').exec(window.location.search);
    return match && decodeURIComponent(match[1].replace(/\+/g, ' '));
}

OR

You can also use the plugin jQuery-URL-Parser allows to retrieve all parts of URL, including anchor, host, etc.

Usage is very simple and cool:

$.url().param("itemID")

via James&Alfa

How can I check if a string represents an int, without using try/except?

I have one possibility that doesn't use int at all, and should not raise an exception unless the string does not represent a number

float(number)==float(number)//1

It should work for any kind of string that float accepts, positive, negative, engineering notation...

Python: split a list based on a condition?

If your concern is not to use two lines of code for an operation whose semantics only need once you just wrap some of the approaches above (even your own) in a single function:

def part_with_predicate(l, pred):
    return [i for i in l if pred(i)], [i for i in l if not pred(i)]

It is not a lazy-eval approach and it does iterate twice through the list, but it allows you to partition the list in one line of code.

How to create timer in angular2

Another solution is to use TimerObservable

TimerObservable is a subclass of Observable.

import {Component, OnInit, OnDestroy} from '@angular/core';
import {Subscription} from "rxjs";
import {TimerObservable} from "rxjs/observable/TimerObservable";

@Component({
  selector: 'app-component',
  template: '{{tick}}',
})
export class Component implements OnInit, OnDestroy {

  private tick: string;
  private subscription: Subscription;

  constructor() {
  }

  ngOnInit() {
    let timer = TimerObservable.create(2000, 1000);
    this.subscription = timer.subscribe(t => {
      this.tick = t;
    });
  }

  ngOnDestroy() {
    this.subscription.unsubscribe();
  }
}

P.S.: Don't forget to unsubsribe.

Javascript "Not a Constructor" Exception while creating objects

I just want to add that if the constructor is called from a different file, then something as simple as forgetting to export the constructor with

module.exports = NAME_OF_CONSTRUCTOR

will also cause the "Not a constructor" exception.

TSQL select into Temp table from dynamic sql

A working example.

DECLARE @TableName AS VARCHAR(100)
SELECT @TableName = 'YourTableName'

EXECUTE ('SELECT * INTO #TEMP  FROM ' + @TableName +'; SELECT * FROM #TEMP;')

Second solution with accessible temp table

DECLARE @TableName AS VARCHAR(100)
SELECT @TableName = 'YOUR_TABLE_NAME'

EXECUTE ('CREATE VIEW vTemp AS
        SELECT *
        FROM ' + @TableName)
SELECT * INTO #TEMP  FROM vTemp 

--DROP THE VIEW HERE      
DROP VIEW vTemp

/*START USING TEMP TABLE
************************/
--EX:
SELECT * FROM #TEMP


--DROP YOUR TEMP TABLE HERE
DROP TABLE #TEMP

How to use cURL to get jSON data and decode the data?

You can Use this for Curl:

function fakeip()  
{  
    return long2ip( mt_rand(0, 65537) * mt_rand(0, 65535) );   
}  

function getdata($url,$args=false) 
{ 
    global $session; 
    $ch = curl_init(); 
    curl_setopt($ch, CURLOPT_URL,$url); 
    curl_setopt($ch, CURLOPT_HTTPHEADER, array("REMOTE_ADDR: ".fakeip(),"X-Client-IP: ".fakeip(),"Client-IP: ".fakeip(),"HTTP_X_FORWARDED_FOR: ".fakeip(),"X-Forwarded-For: ".fakeip())); 
    if($args) 
    { 
        curl_setopt($ch, CURLOPT_POST, 1); 
        curl_setopt($ch, CURLOPT_POSTFIELDS,$args); 
    } 
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); 
    //curl_setopt($ch, CURLOPT_PROXY, "127.0.0.1:8888"); 
    $result = curl_exec ($ch); 
    curl_close ($ch); 
    return $result; 
} 

Then To Read Json:

$result=getdata("https://example.com");

Then :

///Deocde Json
$data = json_decode($result,true);
///Count
             $total=count($data);
             $Str='<h1>Total : '.$total.'';
             echo $Str;
//You Can Also Make In Table:
             foreach ($data as $key => $value)
              {
          echo '  <td><font  face="calibri"color="red">'.$value[type].'   </font></td><td><font  face="calibri"color="blue">'.$value[category].'   </font></td><td><font  face="calibri"color="green">'.$value[amount].'   </font></tr><tr>';

           }
           echo "</tr></table>";
           }

You Can Also Use This:

echo '<p>Name : '.$data['result']['name'].'</p>
      <img src="'.$data['result']['pic'].'"><br>';

Hope this helped.

Get name of object or class

Get your object's constructor function and then inspect its name property.

myObj.constructor.name

Returns "myClass".

New line in Sql Query

use CHAR(10) for New Line in SQL
char(9) for Tab
and Char(13) for Carriage Return

Retain precision with double in Java

As others have noted, not all decimal values can be represented as binary since decimal is based on powers of 10 and binary is based on powers of two.

If precision matters, use BigDecimal, but if you just want friendly output:

System.out.printf("%.2f\n", total);

Will give you:

11.40

How to check if a given directory exists in Ruby

You can also use Dir::exist? like so:

Dir.exist?('Directory Name')

Returns true if the 'Directory Name' is a directory, false otherwise.1

How to use setInterval and clearInterval?

I used angular with electron,

In my case, setInterval returns a Nodejs Timer object. which when I called clearInterval(timerobject) it did not work.

I had to get the id first and call to clearInterval

clearInterval(timerobject._id)

I have struggled many hours with this. hope this helps.

Cannot find Dumpbin.exe

You can use the Visual Studio command prompt. dumpbin is available then.

Difference between using Throwable and Exception in a try catch

By catching Throwable it includes things that subclass Error. You should generally not do that, except perhaps at the very highest "catch all" level of a thread where you want to log or otherwise handle absolutely everything that can go wrong. It would be more typical in a framework type application (for example an application server or a testing framework) where it can be running unknown code and should not be affected by anything that goes wrong with that code, as much as possible.

How to pass a function as a parameter in Java?

I used the command pattern that @jk. mentioned, adding a return type:

public interface Callable<I, O> {

    public O call(I input);   
}

Cleanest way to toggle a boolean variable in Java?

Before:

boolean result = isresult();
if (result) {
    result = false;
} else {
    result = true;
}

After:

boolean result = isresult();
result ^= true;

Do I use <img>, <object>, or <embed> for SVG files?

If you need your SVGs to be fully styleable with CSS they have to be inline in the DOM. This can be achieved through SVG injection, which uses Javascript to replace a HTML element (usually an <img> element) with the contents of an SVG file after the page has loaded.

Here is a minimal example using SVGInject:

<html>
<head>
  <script src="svg-inject.min.js"></script>
</head>
<body>
  <img src="image.svg" onload="SVGInject(this)" />
</body>
</html>

After the image is loaded the onload="SVGInject(this) will trigger the injection and the <img> element will be replaced by the contents of the file provided in the src attribute. This works with all browsers that support SVG.

Disclaimer: I am the co-author of SVGInject

How to pass the password to su/sudo/ssh without overriding the TTY?

The usual solution to this problem is setuiding a helper app that performs the task requiring superuser access: http://en.wikipedia.org/wiki/Setuid

Sudo is not meant to be used offline.

Later edit: SSH can be used with private-public key authentication. If the private key does not have a passphrase, ssh can be used without prompting for a password.

How can I find all matches to a regular expression in Python?

Use re.findall or re.finditer instead.

re.findall(pattern, string) returns a list of matching strings.

re.finditer(pattern, string) returns an iterator over MatchObject objects.

Example:

re.findall( r'all (.*?) are', 'all cats are smarter than dogs, all dogs are dumber than cats')
# Output: ['cats', 'dogs']

[x.group() for x in re.finditer( r'all (.*?) are', 'all cats are smarter than dogs, all dogs are dumber than cats')]
# Output: ['all cats are', 'all dogs are']

git ignore exception

This is how I do it, with a README.md file in each directory:

/data/*
!/data/README.md

!/data/input/
/data/input/*
!/data/input/README.md

!/data/output/
/data/output/*
!/data/output/README.md

The database cannot be opened because it is version 782. This server supports version 706 and earlier. A downgrade path is not supported

I use VS 2017. By default SQL Server Instance name is (LocalDB)\MSSQLLocalDB. However, downgrading the compatibility level of the database to 110 as in @user3390927's answer, I could attach the database file in VS, choosing Server Name as "localhost\SQLExpress".

Handling key-press events (F1-F12) using JavaScript and jQuery, cross-browser

Solution in ES6 for modern browsers and IE11 (with transpilation to ES5):

//Disable default IE help popup
window.onhelp = function() {
    return false;
};
window.onkeydown = evt => {
    switch (evt.keyCode) {
        //ESC
        case 27:
            this.onEsc();
            break;
        //F1
        case 112:
            this.onF1();
            break;
        //Fallback to default browser behaviour
        default:
            return true;
    }
    //Returning false overrides default browser event
    return false;
};

Why AVD Manager options are not showing in Android Studio

Here is a screenshot of me fixing this. I've encountered it many times, and it's always due to this config-related jazz:

  1. Click Event Log (bottom right)
  2. Click Configure of the Android Framework detected notification
  3. Done

enter image description here

If you do this and your icon still isn't lit up, then you probably need to set up the emulator still. I would recommend investigating the SDK Manager if so.

Make Frequency Histogram for Factor Variables

If you'd like to do this in ggplot, an API change was made to geom_histogram() that leads to an error: https://github.com/hadley/ggplot2/issues/1465

To get around this, use geom_bar():

animals <- c("cat", "dog",  "dog", "dog", "dog", "dog", "dog", "dog", "cat", "cat", "bird")

library(ggplot2)
# counts
ggplot(data.frame(animals), aes(x=animals)) +
  geom_bar()

enter image description here

jquery get all input from specific form

Use HTML Form "elements" attribute:

$.each($("form").elements, function(){ 
    console.log($(this));
    });

Now it's not necessary to provide such names as "input, textarea, select ..." etc.

bypass invalid SSL certificate in .net core

ServicePointManager.ServerCertificateValidationCallback isn't supported in .Net Core.

Current situation is that it will be a a new ServerCertificateCustomValidationCallback method for the upcoming 4.1.* System.Net.Http contract (HttpClient). .NET Core team are finalizing the 4.1 contract now. You can read about this in here on github

You can try out the pre-release version of System.Net.Http 4.1 by using the sources directly here in CoreFx or on the MYGET feed: https://dotnet.myget.org/gallery/dotnet-core

Current WinHttpHandler.ServerCertificateCustomValidationCallback definition on Github

Checking version of angular-cli that's installed?

ng version or ng --version or ng v OR ng -v

You can use this 4 commands to check the which version of angular-cli installed in your machine.

Where are the recorded macros stored in Notepad++?

Hit F6

Insert::

npp_open $(PLUGINS_CONFIG_DIR)\..\..\shortcuts.xml

Click OK

You now have the file opened in your editor.


Before altering things checkout the related docs:

Sql query to insert datetime in SQL Server

You will want to use the YYYYMMDD for unambiguous date determination in SQL Server.

insert into table1(approvaldate)values('20120618 10:34:09 AM');

If you are married to the dd-mm-yy hh:mm:ss xm format, you will need to use CONVERT with the specific style.

insert into table1 (approvaldate)
       values (convert(datetime,'18-06-12 10:34:09 PM',5));

5 here is the style for Italian dates. Well, not just Italians, but that's the culture it's attributed to in Books Online.

How to compare arrays in JavaScript?

I like to use the Underscore library for array/object heavy coding projects ... in Underscore and Lodash whether you're comparing arrays or objects it just looks like this:

_.isEqual(array1, array2)   // returns a boolean
_.isEqual(object1, object2) // returns a boolean

fatal: bad default revision 'HEAD'

I got the same error and couldn't solve it.

Then I noticed 3 extra files in one of my directories.

The files were named:

config, HEAD, description

I deleted the files, and the error didn't appear.

config contained:

[core]
    repositoryformatversion = 0
    filemode = true
    bare = true

HEAD contained:

ref: refs/heads/master

description contained:

Unnamed repository; edit this file 'description' to name the repository.

Example: Communication between Activity and Service using Messaging

For sending data to a service you can use:

Intent intent = new Intent(getApplicationContext(), YourService.class);
intent.putExtra("SomeData","ItValue");
startService(intent);

And after in service in onStartCommand() get data from intent.

For sending data or event from a service to an application (for one or more activities):

private void sendBroadcastMessage(String intentFilterName, int arg1, String extraKey) {
    Intent intent = new Intent(intentFilterName);
    if (arg1 != -1 && extraKey != null) {
        intent.putExtra(extraKey, arg1);
    }
    sendBroadcast(intent);
}

This method is calling from your service. You can simply send data for your Activity.

private void someTaskInYourService(){

    //For example you downloading from server 1000 files
    for(int i = 0; i < 1000; i++) {
        Thread.sleep(5000) // 5 seconds. Catch in try-catch block
        sendBroadCastMessage(Events.UPDATE_DOWNLOADING_PROGRESSBAR, i,0,"up_download_progress");
    }

For receiving an event with data, create and register method registerBroadcastReceivers() in your activity:

private void registerBroadcastReceivers(){
    broadcastReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            int arg1 = intent.getIntExtra("up_download_progress",0);
            progressBar.setProgress(arg1);
        }
    };
    IntentFilter progressfilter = new IntentFilter(Events.UPDATE_DOWNLOADING_PROGRESS);
    registerReceiver(broadcastReceiver,progressfilter);

For sending more data, you can modify method sendBroadcastMessage();. Remember: you must register broadcasts in onResume() & unregister in onStop() methods!

UPDATE

Please don't use my type of communication between Activity & Service. This is the wrong way. For a better experience please use special libs, such us:

1) EventBus from greenrobot

2) Otto from Square Inc

P.S. I'm only using EventBus from greenrobot in my projects,

SQL comment header examples

Here is my preferred variant:

/* =====================================================================
DESC:   Some notes about what this does
           tabbed in if you need additional lines
NOTES:  Additional notes
           tabbed in if you need additional lines
======================================================================== */

Create an empty data.frame

The most efficient way to do this is to use structure to create a list that has the class "data.frame":

structure(list(Date = as.Date(character()), File = character(), User = character()), 
          class = "data.frame")
# [1] Date File User
# <0 rows> (or 0-length row.names)

To put this into perspective compared to the presently accepted answer, here's a simple benchmark:

s <- function() structure(list(Date = as.Date(character()), 
                               File = character(), 
                               User = character()), 
                          class = "data.frame")
d <- function() data.frame(Date = as.Date(character()),
                           File = character(), 
                           User = character(), 
                           stringsAsFactors = FALSE) 
library("microbenchmark")
microbenchmark(s(), d())
# Unit: microseconds
#  expr     min       lq     mean   median      uq      max neval
#   s()  58.503  66.5860  90.7682  82.1735 101.803  469.560   100
#   d() 370.644 382.5755 523.3397 420.1025 604.654 1565.711   100

What is Java Servlet?

I think servlet is basically a java class which acts as a middle way between HTTP request and HTTP response.Servlet is also used to make your web page dynamic. Suppose for example if you want to redirect to another web page on server then you have to use servlets. Another important thing is that servlet can run on localhost as well as a web browser.

How do I fix "Expected to return a value at the end of arrow function" warning?

The problem seems to be that you are not returning something in the event that your first if-case is false.

The error you are getting states that your arrow function (comment) => { doesn't have a return statement. While it does for when your if-case is true, it does not return anything for when it's false.

return this.props.comments.map((comment) => {
  if (comment.hasComments === true) {
    return (
      <div key={comment.id}>
        <CommentItem className="MainComment" />
        {this.props.comments.map(commentReply => {
          if (commentReply.replyTo === comment.id) { 
            return (
              <CommentItem className="SubComment"/>
            )
          }
        })
        }
      </div>
    )
  } else {
     //return something here.
  }
});

edit you should take a look at Kris' answer for how to better implement what you are trying to do.

TimePicker Dialog from clicking EditText

You have not put the last argument in the TimePickerDialog.

{
public TimePickerDialog(Context context, OnTimeSetListener listener, int hourOfDay, int minute,
            boolean is24HourView) {
        this(context, 0, listener, hourOfDay, minute, is24HourView);
    }
}

this is the code of the TimePickerclass. it requires a boolean argument is24HourView

How to make HTTP Post request with JSON body in Swift

    var request = URLRequest(url: URL(string:  "your URL")!)
    request.httpMethod = "POST"


    let postString =  String(format: "email=%@&lang=%@", arguments: [txt_emailVirify.text!, language!])
    print(postString)

    emailString = txt_emailVirify.text!

    request.httpBody = postString.data(using: .utf8)
    request.addValue("delta141forceSEAL8PARA9MARCOSBRAHMOS", forHTTPHeaderField: "Authorization")
    request.addValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
    request.addValue("application/json", forHTTPHeaderField: "Accept")


    let task = URLSession.shared.dataTask(with: request) { data, response, error in
        guard let data = data, error == nil
            else
        {
            print("error=\(String(describing: error))")
            return
        }

        do
        {

            let dictionary = try JSONSerialization.jsonObject(with: data, options: .allowFragments) as! NSDictionary
            print(dictionary)

            let status = dictionary.value(forKey: "status") as! String
            let sts = Int(status)
            DispatchQueue.main.async()
                {
                    if sts == 200
                    {
                        print(dictionary)


                    }
                    else
                    {
                       self.alertMessageOk(title: self.Alert!, message: dictionary.value(forKey: "message") as! String)


                    }
            }
        }
        catch
        {
            print(error)
        }

    }
    task.resume()

Adding values to Arraylist

The second form is preferred:

ArrayList<Object> arr = new ArrayList<Object>();
arr.add(3);
arr.add("ss");

Always specify generic arguments when using generic types (such as ArrayList<T>). This rules out the first form.

As to the last form, it is more verbose and does extra work for no benefit.

Creating a List of Lists in C#

public class ListOfLists<T> : List<List<T>>
{
}


var myList = new ListOfLists<string>();

MongoDB - admin user not authorized

I had this problem because of the hostname in my MongoDB Compass was pointing to admin instead for my project. Fixed by adding the /projectname after the hostname :) Try this:

  1. Choose your project in the MongoDB atlas website
  2. Connect/Connect with MongoDB Compass
  3. Download Compass/Choose your OS
  4. I used Compass 1.12 or later
  5. Copy the connection string under the Compass 1.12 or later.
  6. Open MongoDB Compass/Connect(top left)/Connect To
  7. Connection String detected/Yes/
  8. Append your project name after the hostname: cluster9-foodie.mongodb.net/projectname
  9. Connect & Tested the API with POSTMAN.
  10. Succeed.

Use the same connection string in your code too:

  1. Before:
    • mongodb+srv://projectname:password@cluster9-foodie.mongodb.net/admin
  2. After:
    • mongodb+srv://projectname:password@cluster9-foodie.mongodb.net/projectname

Good luck.

How do I get the collection of Model State Errors in ASP.NET MVC?

Putting together several answers from above, this is what I ended up using:

var validationErrors = ModelState.Values.Where(E => E.Errors.Count > 0)
    .SelectMany(E => E.Errors)
    .Select(E => E.ErrorMessage)
    .ToList();

validationErrors ends up being a List<string> that contains each error message. From there, it's easy to do what you want with that list.

enter image description here

How to bind WPF button to a command in ViewModelBase?

 <Grid >
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="*"/>
    </Grid.ColumnDefinitions>
    <Button Command="{Binding ClickCommand}" Width="100" Height="100" Content="wefwfwef"/>
</Grid>

the code behind for the window:

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        DataContext = new ViewModelBase();
    }
}

The ViewModel:

public class ViewModelBase
{
    private ICommand _clickCommand;
    public ICommand ClickCommand
    {
        get
        {
            return _clickCommand ?? (_clickCommand = new CommandHandler(() => MyAction(), ()=> CanExecute));
        }
    }
     public bool CanExecute
     {
        get
        {
            // check if executing is allowed, i.e., validate, check if a process is running, etc. 
            return true/false;
        }
     }

    public void MyAction()
    {

    }
}

Command Handler:

 public class CommandHandler : ICommand
{
    private Action _action;
    private Func<bool> _canExecute;

    /// <summary>
    /// Creates instance of the command handler
    /// </summary>
    /// <param name="action">Action to be executed by the command</param>
    /// <param name="canExecute">A bolean property to containing current permissions to execute the command</param>
    public CommandHandler(Action action, Func<bool> canExecute)
    {
        _action = action;
        _canExecute = canExecute;
    }

    /// <summary>
    /// Wires CanExecuteChanged event 
    /// </summary>
    public event EventHandler CanExecuteChanged
    {
        add { CommandManager.RequerySuggested += value; }
        remove { CommandManager.RequerySuggested -= value; }
    }

    /// <summary>
    /// Forcess checking if execute is allowed
    /// </summary>
    /// <param name="parameter"></param>
    /// <returns></returns>
    public bool CanExecute(object parameter)
    {
        return _canExecute.Invoke();
    }

    public void Execute(object parameter)
    {
        _action();
    }
}

I hope this will give you the idea.

How to find controls in a repeater header or footer

Better solution

You can check item type in ItemCreated event:

protected void rptSummary_ItemCreated(Object sender, RepeaterItemEventArgs e) {
    if (e.Item.ItemType == ListItemType.Footer) {
        e.Item.FindControl(ctrl);
    }
    if (e.Item.ItemType == ListItemType.Header) {
        e.Item.FindControl(ctrl);
    }
}

How to find the difference in days between two dates?

I'd submit another possible solution in Ruby. Looks like it's the be smallest and cleanest looking one so far:

A=2003-12-11
B=2002-10-10
DIFF=$(ruby -rdate -e "puts Date.parse('$A') - Date.parse('$B')")
echo $DIFF

Send json post using php

Beware that file_get_contents solution doesn't close the connection as it should when a server returns Connection: close in the HTTP header.

CURL solution, on the other hand, terminates the connection so the PHP script is not blocked by waiting for a response.

How to store images in mysql database using php

<!-- 
//THIS PROGRAM WILL UPLOAD IMAGE AND WILL RETRIVE FROM DATABASE. UNSING BLOB
(IF YOU HAVE ANY QUERY CONTACT:[email protected])


CREATE TABLE  `images` (
  `id` int(100) NOT NULL AUTO_INCREMENT,
  `name` varchar(100) NOT NULL,
  `image` longblob NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB ;

-->
<!-- this form is user to store images-->
<form action="index.php" method="post"  enctype="multipart/form-data">
Enter the Image Name:<input type="text" name="image_name" id="" /><br />

<input name="image" id="image" accept="image/JPEG" type="file"><br /><br />
<input type="submit" value="submit" name="submit" />
</form>
<br /><br />
<!-- this form is user to display all the images-->
<form action="index.php" method="post"  enctype="multipart/form-data">
Retrive all the images:
<input type="submit" value="submit" name="retrive" />
</form>



<?php
//THIS IS INDEX.PHP PAGE
//connect to database.db name is images
        mysql_connect("", "", "") OR DIE (mysql_error());
        mysql_select_db ("") OR DIE ("Unable to select db".mysql_error());
//to retrive send the page to another page
if(isset($_POST['retrive']))
{
    header("location:search.php");

}

//to upload
if(isset($_POST['submit']))
{
if(isset($_FILES['image'])) {
        $name=$_POST['image_name'];
        $email=$_POST['mail'];
        $fp=addslashes(file_get_contents($_FILES['image']['tmp_name'])); //will store the image to fp
        }
                // our sql query
                $sql = "INSERT INTO images VALUES('null', '{$name}','{$fp}');";
                            mysql_query($sql) or die("Error in Query insert: " . mysql_error());
} 
?>



<?php
//SEARCH.PHP PAGE
    //connect to database.db name = images
         mysql_connect("localhost", "root", "") OR DIE (mysql_error());
        mysql_select_db ("image") OR DIE ("Unable to select db".mysql_error());
//display all the image present in the database

        $msg="";
        $sql="select * from images";
        if(mysql_query($sql))
        {
            $res=mysql_query($sql);
            while($row=mysql_fetch_array($res))
            {
                    $id=$row['id'];
                    $name=$row['name'];
                    $image=$row['image'];

                  $msg.= '<a href="search.php?id='.$id.'"><img src="data:image/jpeg;base64,'.base64_encode($row['image']). ' " />   </a>';

            }
        }
        else
            $msg.="Query failed";
?>
<div>
<?php
echo $msg;
?>

Getting an "ambiguous redirect" error

I got this error when trying to use brace expansion to write output to multiple files.

for example: echo "text" > {f1,f2}.txt results in -bash: {f1,f2}.txt: ambiguous redirect

In this case, use tee to output to multiple files:

echo "text" | tee {f1,f2,...,fn}.txt 1>/dev/null

the 1>/dev/null will prevent the text from being written to stdout

If you want to append to the file(s) use tee -a

How do I set the default locale in the JVM?

You can set it on the command line via JVM parameters:

java -Duser.country=CA -Duser.language=fr ... com.x.Main

For further information look at Internationalization: Understanding Locale in the Java Platform - Using Locale

Killing a process created with Python's subprocess.Popen()

In your code it should be

proc1.kill()

Both kill or terminate are methods of the Popen object which sends the signal signal.SIGKILL to the process.

Storing images in SQL Server?

Why it can be good to store pictures in the database an not in a catalog on the web server.

You have made an application with lots of pictures stored in a folder on the server, that the client has used for years.

Now they come to you. They server has been destroyed and they need to restore it on a new server. They have no access to the old server anymore. The only backup they have is the database backup.

You have of course the source and can simple deploy it to the new server, install SqlServer and restore the database. But now all the pictures are gone.

If you have saved the pictures in SqlServer everything will work as before.

Just my 2 cents.

Unable to auto-detect email address

With SmartGit, you can also edit them by going to Project > Repository settings and hitting the "Commit" tab (make sure to have "Remember as default" selected).

Eclipse interface icons very small on high resolution screen in Windows 8.1

What worked for me at the end was adding the manifest file to the javaw.exe just like Heikki Juntunen said at https://bugs.eclipse.org/bugs/show_bug.cgi?id=421383#c66

The instructions about how to edit the registry and create the manifest file where written by Matthew Cochrane at https://bugs.eclipse.org/bugs/show_bug.cgi?id=421383#c60 and @KItis wrote the instructions here

I put here a copy of that post:


First you need to add this registry key

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\SideBySide\PreferExternalManifest (DWORD) to 1

Next, a manifest file with the same name as the executable must be present in the same folder as the executable. The file is named eclipse.exe.manifest and consists of:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0" xmlns:asmv3="urn:schemas-microsoft-com:asm.v3">
    <description>eclipse</description>
    <trustInfo xmlns="urn:schemas-microsoft-com:asm.v2">
        <security>
            <requestedPrivileges>
                <requestedExecutionLevel xmlns:ms_asmv3="urn:schemas-microsoft-com:asm.v3"
                               level="asInvoker"
                               ms_asmv3:uiAccess="false">
                </requestedExecutionLevel>
            </requestedPrivileges>
        </security>
    </trustInfo>
    <asmv3:application>
        <asmv3:windowsSettings xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">
            <ms_windowsSettings:dpiAware xmlns:ms_windowsSettings="http://schemas.microsoft.com/SMI/2005/WindowsSettings">false</ms_windowsSettings:dpiAware>
        </asmv3:windowsSettings>
    </asmv3:application>
</assembly>

C# Version Of SQL LIKE

public static bool Like(this string value, string pattern)
{
    if (string.IsNullOrEmpty(value) || string.IsNullOrEmpty(pattern))
        return false;

    bool valid = true;
    string[] words = pattern.Split("*");
    int counter = words.Count();

    for (int i = 0; i < counter; i++)
    {
        valid = valid && value.StartsWith(words[i]);                
        value = value.Substring(words[i].Length);
    }
    return valid;
 }

jQuery: How can I show an image popup onclick of the thumbnail?

This is the most popular (9500 stars) and light weight (20KB minify, 7.5KB minify+gzip) popup gallery I think: Magnific-Popup

Disable scrolling on `<input type=number>`

While trying to solve this for myself, I noticed that it's actually possible to retain the scrolling of the page and focus of the input while disabling number changes by attempting to re-fire the caught event on the parent element of the <input type="number"/> on which it was caught, simply like this:

e.target.parentElement.dispatchEvent(e);

However, this causes an error in browser console, and is probably not guaranteed to work everywhere (I only tested on Firefox), since it is intentionally invalid code.

Another solution which works nicely at least on Firefox and Chromium is to temporarily make the <input> element readOnly, like this:

function handleScroll(e) {
  if (e.target.tagName.toLowerCase() === 'input'
    && (e.target.type === 'number')
    && (e.target === document.activeElement)
    && !e.target.readOnly
  ) {
      e.target.readOnly = true;
      setTimeout(function(el){ el.readOnly = false; }, 0, e.target);
  }
}
document.addEventListener('wheel', function(e){ handleScroll(e); });

One side effect that I've noticed is that it may cause the field to flicker for a split-second if you have different styling for readOnly fields, but for my case at least, this doesn't seem to be an issue.

Similarly, (as explained in James' answer) instead of modifying the readOnly property, you can blur() the field and then focus() it back, but again, depending on styles in use, some flickering might occur.

Alternatively, as mentioned in other comments here, you can just call preventDefault() on the event instead. Assuming that you only handle wheel events on number inputs which are in focus and under the mouse cursor (that's what the three conditions above signify), negative impact on user experience would be close to none.

Autoplay an audio with HTML5 embed tag while the player is invisible

You Could use this code, It's Works with me

<div style="visibility:hidden">
    <audio autoplay loop>
        <source src="../audio/audio.mp3">
    </audio> 
</div>

How to open a local disk file with JavaScript?

Consider reformatting your file into javascript. Then you can simply load it using good old...

<script src="thefileIwantToLoad.js" defer></script>

Build fails with "Command failed with a nonzero exit code"

I had the JSONwebtoken pod installed and that was causing issues. I needed to delete the CommonCrypto folder that is in the JSONWebtoken pod folder. Here is a ->link<- explaining the issue. This started happening in Xcode 10.

What is the difference between Scope_Identity(), Identity(), @@Identity, and Ident_Current()?

Scope Identity: Identity of last record added within the stored procedure being executed.

@@Identity: Identity of last record added within the query batch, or as a result of the query e.g. a procedure that performs an insert, the then fires a trigger that then inserts a record will return the identity of the inserted record from the trigger.

IdentCurrent: The last identity allocated for the table.

C# Clear all items in ListView

The Problem is arising because you are trying to clear the entire list box. Just use listView1.Items.Clear();

Key Shortcut for Eclipse Imports

CTRL + 1 can also be used which will suggest to import.

Can I extend a class using more than 1 class in PHP?

You are able to do that using Traits in PHP which announced as of PHP 5.4

Here is a quick tutorial for you, http://culttt.com/2014/06/25/php-traits/

How to create a BKS (BouncyCastle) format Java Keystore that contains a client certificate chain

Detailed Step by Step instructions I followed to achieve this

  • Download bouncycastle JAR from http://repo2.maven.org/maven2/org/bouncycastle/bcprov-ext-jdk15on/1.46/bcprov-ext-jdk15on-1.46.jar or take it from the "doc" folder.
  • Configure BouncyCastle for PC using one of the below methods.
    • Adding the BC Provider Statically (Recommended)
      • Copy the bcprov-ext-jdk15on-1.46.jar to each
        • D:\tools\jdk1.5.0_09\jre\lib\ext (JDK (bundled JRE)
        • D:\tools\jre1.5.0_09\lib\ext (JRE)
        • C:\ (location to be used in env variable)
      • Modify the java.security file under
        • D:\tools\jdk1.5.0_09\jre\lib\security
        • D:\tools\jre1.5.0_09\lib\security
        • and add the following entry
          • security.provider.7=org.bouncycastle.jce.provider.BouncyCastleProvider
      • Add the following environment variable in "User Variables" section
        • CLASSPATH=%CLASSPATH%;c:\bcprov-ext-jdk15on-1.46.jar
    • Add bcprov-ext-jdk15on-1.46.jar to CLASSPATH of your project and Add the following line in your code
      • Security.addProvider(new BouncyCastleProvider());
  • Generate the Keystore using Bouncy Castle
    • Run the following command
      • keytool -genkey -alias myproject -keystore C:/myproject.keystore -storepass myproject -storetype BKS -provider org.bouncycastle.jce.provider.BouncyCastleProvider
    • This generates the file C:\myproject.keystore
    • Run the following command to check if it is properly generated or not
      • keytool -list -keystore C:\myproject.keystore -storetype BKS
  • Configure BouncyCastle for TOMCAT

    • Open D:\tools\apache-tomcat-6.0.35\conf\server.xml and add the following entry

      • <Connector port="8443" keystorePass="myproject" alias="myproject" keystore="c:/myproject.keystore" keystoreType="BKS" SSLEnabled="true" clientAuth="false" protocol="HTTP/1.1" scheme="https" secure="true" sslProtocol="TLS" sslImplementationName="org.bouncycastle.jce.provider.BouncyCastleProvider"/>
    • Restart the server after these changes.

  • Configure BouncyCastle for Android Client
    • No need to configure since Android supports Bouncy Castle Version 1.46 internally in the provided "android.jar".
    • Just implement your version of HTTP Client (MyHttpClient.java can be found below) and set the following in code
      • SSLSocketFactory.setHostnameVerifier(SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
    • If you don't do this, it gives an exception as below
      • javax.net.ssl.SSLException: hostname in certificate didn't match: <192.168.104.66> !=
    • In production mode, change the above code to
      • SSLSocketFactory.setHostnameVerifier(SSLSocketFactory.STRICT_HOSTNAME_VERIFIER);

MyHttpClient.java

package com.arisglobal.aglite.network;

import java.io.InputStream;
import java.security.KeyStore;

import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.conn.scheme.PlainSocketFactory;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.conn.scheme.SchemeRegistry;
import org.apache.http.conn.ssl.SSLSocketFactory;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.conn.SingleClientConnManager;

import com.arisglobal.aglite.activity.R;

import android.content.Context;

public class MyHttpClient extends DefaultHttpClient {

    final Context context;

    public MyHttpClient(Context context) {
        this.context = context;
    }

    @Override
    protected ClientConnectionManager createClientConnectionManager() {
        SchemeRegistry registry = new SchemeRegistry();

        registry.register(new Scheme("http", PlainSocketFactory.getSocketFactory(), 80));

        // Register for port 443 our SSLSocketFactory with our keystore to the ConnectionManager
        registry.register(new Scheme("https", newSslSocketFactory(), 443));
        return new SingleClientConnManager(getParams(), registry);
    }

    private SSLSocketFactory newSslSocketFactory() {
        try {
            // Get an instance of the Bouncy Castle KeyStore format
            KeyStore trusted = KeyStore.getInstance("BKS");

            // Get the raw resource, which contains the keystore with your trusted certificates (root and any intermediate certs)
            InputStream in = context.getResources().openRawResource(R.raw.aglite);
            try {
                // Initialize the keystore with the provided trusted certificates.
                // Also provide the password of the keystore
                trusted.load(in, "aglite".toCharArray());
            } finally {
                in.close();
            }

            // Pass the keystore to the SSLSocketFactory. The factory is responsible for the verification of the server certificate.
            SSLSocketFactory sf = new SSLSocketFactory(trusted);

            // Hostname verification from certificate
            // http://hc.apache.org/httpcomponents-client-ga/tutorial/html/connmgmt.html#d4e506
            sf.setHostnameVerifier(SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
            return sf;
        } catch (Exception e) {
            throw new AssertionError(e);
        }
    }
}

How to invoke the above code in your Activity class:

DefaultHttpClient client = new MyHttpClient(getApplicationContext());
HttpResponse response = client.execute(...);

Temporarily change current working directory in bash to run a command

Something like this should work:

sh -c 'cd /tmp && exec pwd'

unable to set private key file: './cert.pem' type PEM

I have a similar situation, but I use the key and the certificate in different files.

in my case you can check the matching of the key and the lock by comparing the hashes (see https://michaelheap.com/curl-58-unable-to-set-private-key-file-server-key-type-pem/). This helped me to identify inconsistencies.

What is exactly the base pointer and stack pointer? To what do they point?

You have it right. The stack pointer points to the top item on the stack and the base pointer points to the "previous" top of the stack before the function was called.

When you call a function, any local variable will be stored on the stack and the stack pointer will be incremented. When you return from the function, all the local variables on the stack go out of scope. You do this by setting the stack pointer back to the base pointer (which was the "previous" top before the function call).

Doing memory allocation this way is very, very fast and efficient.

What is the meaning of the prefix N in T-SQL statements and when should I use it?

1. Performance:

Assume your where clause is like this:

WHERE NAME='JON'

If the NAME column is of any type other than nvarchar or nchar, then you should not specify the N prefix. However, if the NAME column is of type nvarchar or nchar, then if you do not specify the N prefix, then 'JON' is treated as non-unicode. This means the data type of NAME column and string 'JON' are different and so SQL Server implicitly converts one operand’s type to the other. If the SQL Server converts the literal’s type to the column’s type then there is no issue, but if it does the other way then performance will get hurt because the column's index (if available) wont be used.

2. Character set:

If the column is of type nvarchar or nchar, then always use the prefix N while specifying the character string in the WHERE criteria/UPDATE/INSERT clause. If you do not do this and one of the characters in your string is unicode (like international characters - example - a) then it will fail or suffer data corruption.

There can be only one auto column

Note also that "key" does not necessarily mean primary key. Something like this will work:

CREATE TABLE book (
    isbn             BIGINT NOT NULL PRIMARY KEY,
    id               INT    NOT NULL AUTO_INCREMENT,
    accepted_terms   BIT(1) NOT NULL,
    accepted_privacy BIT(1) NOT NULL,
    INDEX(id)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

This is a contrived example and probably not the best idea, but it can be very useful in certain cases.

PHP Constants Containing Arrays?

Can even work with Associative Arrays.. for example in a class.

class Test {

    const 
        CAN = [
            "can bark", "can meow", "can fly"
        ],
        ANIMALS = [
            self::CAN[0] => "dog",
            self::CAN[1] => "cat",
            self::CAN[2] => "bird"
        ];

    static function noParameter() {
        return self::ANIMALS[self::CAN[0]];
    }

    static function withParameter($which, $animal) {
        return "who {$which}? a {$animal}.";
    }

}

echo Test::noParameter() . "s " . Test::CAN[0] . ".<br>";
echo Test::withParameter(
    array_keys(Test::ANIMALS)[2], Test::ANIMALS["can fly"]
);

// dogs can bark.
// who can fly? a bird.

Why is "cursor:pointer" effect in CSS not working

It works if you remove position:fixed from #firstdiv - but @Sj is probably right as well - most likely a z-index layering issue.

How can I get terminal output in python?

You can use Popen in subprocess as they suggest.

with os, which is not recomment, it's like below:

import os
a  = os.popen('pwd').readlines()

Set Focus After Last Character in Text Box

var val =$("#inputname").val();
$("#inputname").removeAttr('value').attr('value', val).focus();
// I think this is beter for all browsers...

MySQL string replace

Yes, MySQL has a REPLACE() function:

mysql> SELECT REPLACE('www.mysql.com', 'w', 'Ww');
    -> 'WwWwWw.mysql.com'

http://dev.mysql.com/doc/refman/5.0/en/string-functions.html#function_replace

Note that it's easier if you make that an alias when using SELECT

SELECT REPLACE(string_column, 'search', 'replace') as url....

Float a div in top right corner without overlapping sibling header

Another problem solved by the rubber duck:

The css is right but you still have to remember that the HTML elements order matters: the div has to come before the header. http://jsfiddle.net/Fq2Na/1/ enter image description here

Change your HTML code to have the div before the header:

<section>
<div><button>button</button></div>
<h1>some long long long long header, a whole line, 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6</h1>
</section>

And keep your CSS to the simple div { float: right; }.

pull access denied repository does not exist or may require docker login

I had the same error message but for a totally different reason.

Being new to docker, I issued

docker run -it <crypticalId>

where <crypticalId> was the id of my newly created container.

But, the run command wants the id of an image, not a container.

To start a container, docker wants

docker start -i <crypticalId>

error LNK2019: unresolved external symbol _main referenced in function ___tmainCRTStartup

You need a main() function so the program knows where to start.

How to convert a number to string and vice versa in C++

How to convert a number to a string in C++03

  1. Do not use the itoa or itof functions because they are non-standard and therefore not portable.
  2. Use string streams

     #include <sstream>  //include this to use string streams
     #include <string> 
    
    int main()
    {    
        int number = 1234;
    
        std::ostringstream ostr; //output string stream
        ostr << number; //use the string stream just like cout,
        //except the stream prints not to stdout but to a string.
    
        std::string theNumberString = ostr.str(); //the str() function of the stream 
        //returns the string.
    
        //now  theNumberString is "1234"  
    }
    

    Note that you can use string streams also to convert floating-point numbers to string, and also to format the string as you wish, just like with cout

    std::ostringstream ostr;
    float f = 1.2;
    int i = 3;
    ostr << f << " + " i << " = " << f + i;   
    std::string s = ostr.str();
    //now s is "1.2 + 3 = 4.2" 
    

    You can use stream manipulators, such as std::endl, std::hex and functions std::setw(), std::setprecision() etc. with string streams in exactly the same manner as with cout

    Do not confuse std::ostringstream with std::ostrstream. The latter is deprecated

  3. Use boost lexical cast. If you are not familiar with boost, it is a good idea to start with a small library like this lexical_cast. To download and install boost and its documentation go here. Although boost isn't in C++ standard many libraries of boost get standardized eventually and boost is widely considered of the best C++ libraries.

    Lexical cast uses streams underneath, so basically this option is the same as the previous one, just less verbose.

    #include <boost/lexical_cast.hpp>
    #include <string>
    
    int main()
    {
       float f = 1.2;
       int i = 42;
       std::string sf = boost::lexical_cast<std::string>(f); //sf is "1.2"
       std::string si = boost::lexical_cast<std::string>(i); //sf is "42"
    }
    

How to convert a string to a number in C++03

  1. The most lightweight option, inherited from C, is the functions atoi (for integers (alphabetical to integer)) and atof (for floating-point values (alphabetical to float)). These functions take a C-style string as an argument (const char *) and therefore their usage may be considered a not exactly good C++ practice. cplusplus.com has easy-to-understand documentation on both atoi and atof including how they behave in case of bad input. However the link contains an error in that according to the standard if the input number is too large to fit in the target type, the behavior is undefined.

    #include <cstdlib> //the standard C library header
    #include <string>
    int main()
    {
        std::string si = "12";
        std::string sf = "1.2";
        int i = atoi(si.c_str()); //the c_str() function "converts" 
        double f = atof(sf.c_str()); //std::string to const char*
    }
    
  2. Use string streams (this time input string stream, istringstream). Again, istringstream is used just like cin. Again, do not confuse istringstream with istrstream. The latter is deprecated.

    #include <sstream>
    #include <string>
    int main()
    {
       std::string inputString = "1234 12.3 44";
       std::istringstream istr(inputString);
       int i1, i2;
       float f;
       istr >> i1 >> f >> i2;
       //i1 is 1234, f is 12.3, i2 is 44  
    }
    
  3. Use boost lexical cast.

    #include <boost/lexical_cast.hpp>
    #include <string>
    
    int main()
    {
       std::string sf = "42.2"; 
       std::string si = "42";
       float f = boost::lexical_cast<float>(sf); //f is 42.2
       int i = boost::lexical_cast<int>(si);  //i is 42
    }       
    

    In case of a bad input, lexical_cast throws an exception of type boost::bad_lexical_cast

"Uncaught TypeError: undefined is not a function" - Beginner Backbone.js Application

[Joke mode on]

You can fix this by adding this:

https://github.com/donavon/undefined-is-a-function

import { undefined } from 'undefined-is-a-function';
// Fixed! undefined is now a function.

[joke mode off]

Java: Finding the highest value in an array

import java.util.*;
class main9 //Find the smallest and 2lagest and  ascending and descending order of  elements in array//
{
    public static void main(String args[])
    {
        Scanner sc=new Scanner(System.in);
        System.out.println("Enter the array range");
        int no=sc.nextInt();
        System.out.println("Enter the array element");
        int a[]=new int[no];
        int i;
        for(i=0;i<no;i++)
        {
            a[i]=sc.nextInt();
        }
        Arrays.sort(a);
        int s=a[0];
        int l=a[a.length-1];
        int m=a[a.length-2];
        System.out.println("Smallest no is="+s);
        System.out.println("lagest 2 numbers are=");
        System.out.println(l);
        System.out.println(m);
        System.out.println("Array in ascending:");
        for(i=0;i<no;i++)
        {
            System.out.println(a[i]);
        }
        System.out.println("Array in descending:");
        for(i=a.length-1;i>=0;i--)
        {
            System.out.println(a[i]);
        }
    }
}

How do I stop a program when an exception is raised in Python?

import sys

try:
    import feedparser
except:
    print "Error: Cannot import feedparser.\n" 
    sys.exit(1)

Here we're exiting with a status code of 1. It is usually also helpful to output an error message, write to a log, and clean up.

How to upload & Save Files with Desired name

Just get the file extention then assign the file a new name with uniqid and pass the new name to the move_upload_file method. For example:

if(isset($_POST['submit'])){
  $total = count($_FILES['files']['tmp_name']);
  for($i=0;$i<$total;$i++){
    $fileName = $_FILES['files']['name'][$i];
    $ext = pathinfo($fileName, PATHINFO_EXTENSION);
    $newFileName = uniqid();
    $fileDest = 'filesUploaded/'.$newFileName.'.'.$ext;
    if($ext === 'pdf' || 'jpeg' || 'JPG'){
        move_uploaded_file($_FILES['files']['tmp_name'][$i], $fileDest);
        $fileUpload = $newFileName.'.'.$ext[$i].',<br>';
    }else{
      echo 'Pdfs and jpegs only please';
    }
  }
}

Passing string to a function in C - with or without pointers?

The accepted convention of passing C-strings to functions is to use a pointer:

void function(char* name)

When the function modifies the string you should also pass in the length:

void function(char* name, size_t name_length)

Your first example:

char *functionname(char *string name[256])

passes an array of pointers to strings which is not what you need at all.

Your second example:

char functionname(char string[256])

passes an array of chars. The size of the array here doesn't matter and the parameter will decay to a pointer anyway, so this is equivalent to:

char functionname(char *string)

See also this question for more details on array arguments in C.

Convert datetime value into string

Use DATE_FORMAT()

SELECT
  DATE_FORMAT(NOW(), '%d %m %Y') AS your_date;

Commit only part of a file in Git

With TortoiseGit:

right click on the file and use Context Menu ? Restore after commit. This will create a copy of the file as it is. Then you can edit the file, e.g. in TortoiseGitMerge and undo all the changes you don't want to commit. After saving those changes you can commit the file.

Use jQuery to get the file input's selected filename without the path

Get path work with all OS

var filename = $('input[type=file]').val().replace(/.*(\/|\\)/, '');

Example

C:\fakepath\filename.doc 
/var/fakepath/filename.doc

Both return

filename.doc
filename.doc

Disable scrolling when touch moving certain element

I found that ev.stopPropagation(); worked for me.

Place input box at the center of div

#input_box {
    margin: 0 auto;
    text-align: left;
}
#div {
    text-align: center;
}

<div id="div">
    <label for="input_box">Input: </label><input type="text" id="input_box" name="input_box" />
</div>

or you could do it using padding, but this is not that great of an idea.

How do I add a new class to an element dynamically?

Since everyone has given you jQuery/JS answers to this, I will provide an additional solution. The answer to your question is still no, but using LESS (a CSS Pre-processor) you can do this easily.

.first-class {
  background-color: yellow;
}
.second-class:hover {
  .first-class;
}

Quite simply, any time you hover over .second-class it will give it all the properties of .first-class. Note that it won't add the class permanently, just on hover. You can learn more about LESS here: Getting Started with LESS

Here is a SASS way to do it as well:

.first-class {
  background-color: yellow;
}
.second-class {
  &:hover {
    @extend .first-class;
  }
}

AngularJS - value attribute for select

If you use the track by option, the value attribute is correctly written, e.g.:

<div ng-init="a = [{label: 'one', value: 15}, {label: 'two', value: 20}]">
    <select ng-model="foo" ng-options="x for x in a track by x.value"/>
</div>

produces:

<select>
    <option value="" selected="selected"></option>
    <option value="15">one</option>
    <option value="20">two</option>
</select>

Kill all processes for a given user

Just (temporarily) killed my Macbook with

killall -u pu -m .

where pu is my userid. Watch the dot at the end of the command.

Also try

pkill -u pu

or

ps -o pid -u pu | xargs kill -1

How can I assign an ID to a view programmatically?

Android id overview

An Android id is an integer commonly used to identify views; this id can be assigned via XML (when possible) and via code (programmatically.) The id is most useful for getting references for XML-defined Views generated by an Inflater (such as by using setContentView.)

Assign id via XML

  • Add an attribute of android:id="@+id/somename" to your view.
  • When your application is built, the android:id will be assigned a unique int for use in code.
  • Reference your android:id's int value in code using "R.id.somename" (effectively a constant.)
  • this int can change from build to build so never copy an id from gen/package.name/R.java, just use "R.id.somename".
  • (Also, an id assigned to a Preference in XML is not used when the Preference generates its View.)

Assign id via code (programmatically)

  • Manually set ids using someView.setId(int);
  • The int must be positive, but is otherwise arbitrary- it can be whatever you want (keep reading if this is frightful.)
  • For example, if creating and numbering several views representing items, you could use their item number.

Uniqueness of ids

  • XML-assigned ids will be unique.
  • Code-assigned ids do not have to be unique
  • Code-assigned ids can (theoretically) conflict with XML-assigned ids.
  • These conflicting ids won't matter if queried correctly (keep reading).

When (and why) conflicting ids don't matter

  • findViewById(int) will iterate depth-first recursively through the view hierarchy from the View you specify and return the first View it finds with a matching id.
  • As long as there are no code-assigned ids assigned before an XML-defined id in the hierarchy, findViewById(R.id.somename) will always return the XML-defined View so id'd.

Dynamically Creating Views and Assigning IDs

  • In layout XML, define an empty ViewGroup with id.
  • Such as a LinearLayout with android:id="@+id/placeholder".
  • Use code to populate the placeholder ViewGroup with Views.
  • If you need or want, assign any ids that are convenient to each view.
  • Query these child views using placeholder.findViewById(convenientInt);

  • API 17 introduced View.generateViewId() which allows you to generate a unique ID.

If you choose to keep references to your views around, be sure to instantiate them with getApplicationContext() and be sure to set each reference to null in onDestroy. Apparently leaking the Activity (hanging onto it after is is destroyed) is wasteful.. :)

Reserve an XML android:id for use in code

API 17 introduced View.generateViewId() which generates a unique ID. (Thanks to take-chances-make-changes for pointing this out.)*

If your ViewGroup cannot be defined via XML (or you don't want it to be) you can reserve the id via XML to ensure it remains unique:

Here, values/ids.xml defines a custom id:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <item name="reservedNamedId" type="id"/>
</resources>

Then once the ViewGroup or View has been created, you can attach the custom id

myViewGroup.setId(R.id.reservedNamedId);

Conflicting id example

For clarity by way of obfuscating example, lets examine what happens when there is an id conflict behind the scenes.

layout/mylayout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    <LinearLayout
        android:id="@+id/placeholder"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >
</LinearLayout>

To simulate a conflict, lets say our latest build assigned R.id.placeholder(@+id/placeholder) an int value of 12..

Next, MyActivity.java defines some adds views programmatically (via code):

int placeholderId = R.id.placeholder; // placeholderId==12
// returns *placeholder* which has id==12:
ViewGroup placeholder = (ViewGroup)this.findViewById(placeholderId);
for (int i=0; i<20; i++){
    TextView tv = new TextView(this.getApplicationContext());
    // One new TextView will also be assigned an id==12:
    tv.setId(i);
    placeholder.addView(tv);
}

So placeholder and one of our new TextViews both have an id of 12! But this isn't really a problem if we query placeholder's child views:

// Will return a generated TextView:
 placeholder.findViewById(12);

// Whereas this will return the ViewGroup *placeholder*;
// as long as its R.id remains 12: 
Activity.this.findViewById(12);

*Not so bad

moment.js, how to get day of week number

I think this would work

moment().weekday(); //if today is thursday it will return 4

How to set .net Framework 4.5 version in IIS 7 application pool

Go to "Run" and execute this:

%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_regiis.exe -ir

NOTE: run as administrator.

Passing arguments to C# generic new() of templated type

This will not work in your situation. You can only specify the constraint that it has an empty constructor:

public static string GetAllItems<T>(...) where T: new()

What you could do is use property injection by defining this interface:

public interface ITakesAListItem
{
   ListItem Item { set; }
}

Then you could alter your method to be this:

public static string GetAllItems<T>(...) where T : ITakesAListItem, new()
{
   ...
   List<T> tabListItems = new List<T>();
   foreach (ListItem listItem in listCollection) 
   {
       tabListItems.Add(new T() { Item = listItem });
   } 
   ...
}

The other alternative is the Func method described by JaredPar.

how to concat two columns into one with the existing column name in mysql?

Instead of getting all the table columns using * in your sql statement, you use to specify the table columns you need.

You can use the SQL statement something like:

SELECT CONCAT(FIRSTNAME, ' ', LASTNAME) AS FIRSTNAME FROM customer;

BTW, why couldn't you use FullName instead of FirstName? Like this:

SELECT CONCAT(FIRSTNAME, ' ', LASTNAME) AS 'CUSTOMER NAME' FROM customer;

I want my android application to be only run in portrait mode?

Old post I know. In order to run your app always in portrait mode even when orientation may be or is swapped etc (for example on tablets) I designed this function that is used to set the device in the right orientation without the need to know how the portrait and landscape features are organised on the device.

   private void initActivityScreenOrientPortrait()
    {
        // Avoid screen rotations (use the manifests android:screenOrientation setting)
        // Set this to nosensor or potrait

        // Set window fullscreen
        this.activity.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

        DisplayMetrics metrics = new DisplayMetrics();
        this.activity.getWindowManager().getDefaultDisplay().getMetrics(metrics);

         // Test if it is VISUAL in portrait mode by simply checking it's size
        boolean bIsVisualPortrait = ( metrics.heightPixels >= metrics.widthPixels ); 

        if( !bIsVisualPortrait )
        { 
            // Swap the orientation to match the VISUAL portrait mode
            if( this.activity.getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT )
             { this.activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE); }
            else { this.activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT ); }
        }
        else { this.activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_NOSENSOR); }

    }

Works like a charm!

NOTICE: Change this.activity by your activity or add it to the main activity and remove this.activity ;-)

Bold black cursor in Eclipse deletes code, and I don't know how to get rid of it

The problem is also identified in your status bar at the bottom:

overwrite label in status bar

You are in overwrite mode instead of insert mode.

The “Insert” key toggles between insert and overwrite modes.

:touch CSS pseudo-class or something similar?

Since mobile doesn't give hover feedback, I want, as a user, to see instant feedback when a link is tapped. I noticed that -webkit-tap-highlight-color is the fastest to respond (subjective).

Add the following to your body and your links will have a tap effect.

body {
    -webkit-tap-highlight-color: #ccc;
}

Python: finding lowest integer

l = [-1.2, 0.0, 1]

x = 100.0
for i in l:
    if i < x:
        x = i
print (x)

This is the answer, i needed this for my homework, took your code, and i deleted the " " around the numbers, it then worked, i hope this helped

How do I format a String in an email so Outlook will print the line breaks?

The trick is to use the encodeURIComponent() functionality from js:

var formattedBody = "FirstLine \n Second Line \n Third Line";
var mailToLink = "mailto:[email protected]?body=" + encodeURIComponent(formattedBody);

RESULT:

FirstLine
SecondLine
ThirdLine

C# - Print dictionary

Just to close this

foreach (KeyValuePair<DateTime, string> kvp in dictionary)
{
    //textBox3.Text += ("Key = {0}, Value = {1}", kvp.Key, kvp.Value);
    Console.WriteLine("Key = {0}, Value = {1}", kvp.Key, kvp.Value);
}

Changes to this

foreach (KeyValuePair<DateTime, string> kvp in dictionary)
{
    //textBox3.Text += ("Key = {0}, Value = {1}", kvp.Key, kvp.Value);
    textBox3.Text += string.Format("Key = {0}, Value = {1}", kvp.Key, kvp.Value);
}

Filename timestamp in Windows CMD batch script getting truncated

for /f "tokens=2-8 delims=.:/ " %%a in ("%date% %time: =0%") do set DateNtime=%%c-%%a-%%b_%%d-%%e-%%f.%%g
echo %DateNtime%

Or, from the command line:

for /f "tokens=2-8 delims=.:/ " %a in ("%date% %time: =0%") do echo %c-%a-%b_%d-%e-%f.%g 

EDIT: As per bryce's non-standard time/date specs. (03-Sep-12 9:06:21.54)

@echo off
setlocal enabledelayedexpansion
for /f "tokens=1-7 delims=.:/- " %%a in ("%date% %time%") do (
  if "%%b"=="Jan" set MM=01
  if "%%b"=="Feb" set MM=02
  if "%%b"=="Mar" set MM=03
  if "%%b"=="Apr" set MM=04
  if "%%b"=="May" set MM=05
  if "%%b"=="Jun" set MM=06
  if "%%b"=="Jul" set MM=07
  if "%%b"=="Aug" set MM=08
  if "%%b"=="Sep" set MM=09
  if "%%b"=="Oct" set MM=10
  if "%%b"=="Nov" set MM=11
  if "%%b"=="Dec" set MM=12
  set HH=0%%d
  set HH=!HH:~-2!
  echo 20%%c-!MM!-%%a_!HH!-%%e-%%f.%%g
)
endlocal

What's the best practice for primary keys in tables?

Natural versus artificial keys to me is a matter of how much of the business logic you want in your database. Social Security number (SSN) is a great example.

"Each client in my database will, and must, have an SSN." Bam, done, make it the primary key and be done with it. Just remember when your business rule changes you're burned.

I don't like natural keys myself, due to my experience with changing business rules. But if your sure it won't change, it might prevent a few critical joins.

Looking for a short & simple example of getters/setters in C#

In C#, Properties represent your Getters and Setters.

Here's an example:

public class PropertyExample
{
    private int myIntField = 0;

    public int MyInt
    {
        // This is your getter.
        // it uses the accessibility of the property (public)
        get
        {
            return myIntField;
        }
        // this is your setter
        // Note: you can specify different accessibility
        // for your getter and setter.
        protected set
        {
            // You can put logic into your getters and setters
            // since they actually map to functions behind the scenes
            DoSomeValidation(value)
            {
                // The input of the setter is always called "value"
                // and is of the same type as your property definition
                myIntField = value;
            }
        }
    }
}

You would access this property just like a field. For example:

PropertyExample example = new PropertyExample();
example.MyInt = 4; // sets myIntField to 4
Console.WriteLine( example.MyInt ); // prints 4

A few other things to note:

  1. You don't have to specifiy both a getter and a setter, you can omit either one.
  2. Properties are just "syntactic sugar" for your traditional getter and setter. The compiler will actually build get_ and set_ functions behind the scenes (in the compiled IL) and map all references to your property to those functions.

How can I programmatically check whether a keyboard is present in iOS app?

drawnonward's code is very close, but collides with UIKit's namespace and could be made easier to use.

@interface KeyboardStateListener : NSObject {
    BOOL _isVisible;
}
+ (KeyboardStateListener *)sharedInstance;
@property (nonatomic, readonly, getter=isVisible) BOOL visible;
@end

static KeyboardStateListener *sharedInstance;

@implementation KeyboardStateListener

+ (KeyboardStateListener *)sharedInstance
{
    return sharedInstance;
}

+ (void)load
{
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    sharedInstance = [[self alloc] init];
    [pool release];
}

- (BOOL)isVisible
{
    return _isVisible;
}

- (void)didShow
{
    _isVisible = YES;
}

- (void)didHide
{
    _isVisible = NO;
}

- (id)init
{
    if ((self = [super init])) {
        NSNotificationCenter *center = [NSNotificationCenter defaultCenter];
        [center addObserver:self selector:@selector(didShow) name:UIKeyboardDidShowNotification object:nil];
        [center addObserver:self selector:@selector(didHide) name:UIKeyboardWillHideNotification object:nil];
    }
    return self;
}

@end

Return Result from Select Query in stored procedure to a List

May be this will help:

Getting rows from DB:

public static DataRowCollection getAllUsers(string tableName) 
{
     DataSet set = new DataSet();
     SqlCommand comm = new SqlCommand();
     comm.Connection = DAL.DAL.conn;
     comm.CommandType = CommandType.StoredProcedure;
     comm.CommandText = "getAllUsers";
     SqlDataAdapter da = new SqlDataAdapter();
     da.SelectCommand = comm;
     da.Fill(set,tableName);

     DataRowCollection usersCollection = set.Tables[tableName].Rows;
     return usersCollection;
}

Populating DataGridView from DataRowCollection :

public static void ShowAllUsers(DataGridView grdView,string table, params string[] fields) 
{
    DataRowCollection userSet = getAllUsers(table);
    foreach (DataRow user in userSet)
    {
         grdView.Rows.Add(user[fields[0]],
         user[fields[1]],
         user[fields[2]],
         user[fields[3]]);
    }
}

Implementation :

BLL.BLL.ShowAllUsers(grdUsers,"eusers","eid","euname","eupassword","eposition");

Java - How to find the redirected url of a url?

public static URL getFinalURL(URL url) {
    try {
        HttpURLConnection con = (HttpURLConnection) url.openConnection();
        con.setInstanceFollowRedirects(false);
        con.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.94 Safari/537.36");
        con.addRequestProperty("Accept-Language", "en-US,en;q=0.8");
        con.addRequestProperty("Referer", "https://www.google.com/");
        con.connect();
        //con.getInputStream();
        int resCode = con.getResponseCode();
        if (resCode == HttpURLConnection.HTTP_SEE_OTHER
                || resCode == HttpURLConnection.HTTP_MOVED_PERM
                || resCode == HttpURLConnection.HTTP_MOVED_TEMP) {
            String Location = con.getHeaderField("Location");
            if (Location.startsWith("/")) {
                Location = url.getProtocol() + "://" + url.getHost() + Location;
            }
            return getFinalURL(new URL(Location));
        }
    } catch (Exception e) {
        System.out.println(e.getMessage());
    }
    return url;
}

To get "User-Agent" and "Referer" by yourself, just go to developer mode of one of your installed browser (E.g. press F12 on Google Chrome). Then go to tab 'Network' and then click on one of the requests. You should see it's details. Just press 'Headers' sub tab (the image below) request details

Convert Datetime column from UTC to local time in select statement

Well if you store the data as UTC date in the database you can do something as simple as

select 
 [MyUtcDate] + getdate() - getutcdate()
from [dbo].[mytable]

this was it's always local from the point of the server and you are not fumbling with AT TIME ZONE 'your time zone name', if your database get moved to another time zone like a client installation a hard coded time zone might bite you.

C# error: Use of unassigned local variable

The compiler doesn't know that the Environment.Exit() is going to terminate the program; it just sees you executing a static method on a class. Just initialize queue to null when you declare it.

Queue queue = null;

What is the difference between bottom-up and top-down?

Top down and bottom up DP are two different ways of solving the same problems. Consider a memoized (top down) vs dynamic (bottom up) programming solution to computing fibonacci numbers.

fib_cache = {}

def memo_fib(n):
  global fib_cache
  if n == 0 or n == 1:
     return 1
  if n in fib_cache:
     return fib_cache[n]
  ret = memo_fib(n - 1) + memo_fib(n - 2)
  fib_cache[n] = ret
  return ret

def dp_fib(n):
   partial_answers = [1, 1]
   while len(partial_answers) <= n:
     partial_answers.append(partial_answers[-1] + partial_answers[-2])
   return partial_answers[n]

print memo_fib(5), dp_fib(5)

I personally find memoization much more natural. You can take a recursive function and memoize it by a mechanical process (first lookup answer in cache and return it if possible, otherwise compute it recursively and then before returning, you save the calculation in the cache for future use), whereas doing bottom up dynamic programming requires you to encode an order in which solutions are calculated, such that no "big problem" is computed before the smaller problem that it depends on.

Sending a JSON to server and retrieving a JSON in return, without JQuery

Using new api fetch:

_x000D_
_x000D_
const dataToSend = JSON.stringify({"email": "[email protected]", "password": "101010"});
let dataReceived = ""; 
fetch("", {
    credentials: "same-origin",
    mode: "same-origin",
    method: "post",
    headers: { "Content-Type": "application/json" },
    body: dataToSend
})
    .then(resp => {
        if (resp.status === 200) {
            return resp.json()
        } else {
            console.log("Status: " + resp.status)
            return Promise.reject("server")
        }
    })
    .then(dataJson => {
        dataReceived = JSON.parse(dataJson)
    })
    .catch(err => {
        if (err === "server") return
        console.log(err)
    })

console.log(`Received: ${dataReceived}`)                
_x000D_
_x000D_
_x000D_ You need to handle when server sends other status rather than 200(ok), you should reject that result because if you were to left it in blank, it will try to parse the json but there isn't, so it will throw an error

Finding duplicate integers in an array and display how many times they occurred

Use Group by:

int[] values = new []{1,2,3,4,5,4,4,3};

var groups = values.GroupBy(v => v);
foreach(var group in groups)
    Console.WriteLine("Value {0} has {1} items", group.Key, group.Count());

Is it possible to make desktop GUI application in .NET Core?

You could develop a web application with .NET Core and MVC and encapsulate it in a Windows universal JavaScript app: Progressive Web Apps on Windows

It is still a web application, but it's a very lightweight way to transform a web application into a desktop app without learning a new framework or/and redevelop the UI, and it works great.

The inconvenience is unlike Electron or ReactXP for example, the result is a universal Windows application and not a cross platform desktop application.

Export javascript data to CSV file without server interaction

See adeneo's answer, but don't forget encodeURIComponent!

a.href     = 'data:application/csv;charset=utf-8,' + encodeURIComponent(csvString);

Also, I needed to do "\r\n" not just "\n" for the row delimiter.

var csvString = csvRows.join("\r\n");

Revised fiddle: http://jsfiddle.net/7Q3c6/

How to store(bitmap image) and retrieve image from sqlite database in android?

If you are working with Android's MediaStore database, here is how to store an image and then display it after it is saved.

on button click write this

 Intent in = new Intent(Intent.ACTION_PICK,
                    android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
            in.putExtra("crop", "true");
            in.putExtra("outputX", 100);
            in.putExtra("outputY", 100);
            in.putExtra("scale", true);
            in.putExtra("return-data", true);

            startActivityForResult(in, 1);

then do this in your activity

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        // TODO Auto-generated method stub
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == 1 && resultCode == RESULT_OK && data != null) {

            Bitmap bmp = (Bitmap) data.getExtras().get("data");

            img.setImageBitmap(bmp);
            btnadd.requestFocus();

            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            bmp.compress(Bitmap.CompressFormat.JPEG, 100, baos);
            byte[] b = baos.toByteArray();
            String encodedImageString = Base64.encodeToString(b, Base64.DEFAULT);

            byte[] bytarray = Base64.decode(encodedImageString, Base64.DEFAULT);
            Bitmap bmimage = BitmapFactory.decodeByteArray(bytarray, 0,
                    bytarray.length);

        }

    }

What is the difference between 'protected' and 'protected internal'?

Protected Member

Protected Member of a class in only available in the contained class (in which it has been declared) and in the derived class within the assembly and also outside the assembly.

Means if a class that resides outside the assembly can use the protected member of the other assembly by inherited that class only.

We can exposed the Protected member outside the assembly by inherited that class and use it in the derived class only.

Note: Protected members are not accessible using the object in the derived class.

Internal Member

Internal Member of a class is available or access within the assembly either creating object or in a derived class or you can say it is accessible across all the classes within the assembly.

Note: Internal members not accessible outside the assembly either using object creating or in a derived class.

Protected Internal

Protected Internal access modifier is combination Protected or Internal.

Protected Internal Member can be available within the entire assembly in which it declared either creating object or by inherited that class. And can be accessible outside the assembly in a derived class only.

Note: Protected Internal member works as Internal within the same assembly and works as Protected for outside the assembly.

printf a variable in C

As Shafik already wrote you need to use the right format because scanf gets you a char. Don't hesitate to look here if u aren't sure about the usage: http://www.cplusplus.com/reference/cstdio/printf/

Hint: It's faster/nicer to write x=x+1; the shorter way: x++;

Sorry for answering what's answered just wanted to give him the link - the site was really useful to me all the time dealing with C.

Ubuntu: OpenJDK 8 - Unable to locate package

After adding the JDK repo, before Installing you might want to run an update first so the repo can be added run apt update

an then continue with your installation sudo apt install adoptopenjdk-8-hotspot

How do I exit the Vim editor?

Vim has three modes of operation: Input mode, Command mode & Ex mode.

Input mode - everything that you type, all keystrokes are echoed on the screen.

Command mode or Escape mode - everything that you type in this mode is interpreted as a command.

Ex mode - this is another editor, ex. It is a line editor. It works per line or based on a range of lines. In this mode, a : appears at the bottom of the screen. This is the ex editor.

In order to exit Vim, you can exit while you are in either the ex mode or in the command mode. You cannot exit Vim when you are in input mode.

Exiting from ex mode

  1. You need to be sure that you are in the Command mode. To do that, simply press the Esc key.

  2. Go to the ex mode by pressing the : key

  3. Use any of the following combinations in ex mode to exit:

    :q - quit :q! - quit without saving :wq - save & quit or write & quit :wq! - same as wq, but force write in case file permissions are readonly :x - write & quit :qa - quit all. useful when multiple files are opened like: vim abc.txt xyz.txt

Exiting from command mode

  1. Press the escape key. You probably have done this already if you are in command mode.

  2. Press capital ZZ (shift zz) - save & exit

  3. Press capital ZQ (shift zq) - exit without saving.

Base64 Java encode and decode a string

The following is a good solution -

import android.util.Base64;

String converted = Base64.encodeToString(toConvert.toString().getBytes(), Base64.DEFAULT);

String stringFromBase = new String(Base64.decode(converted, Base64.DEFAULT));

That's it. A single line encoding and decoding.

Search for string within text column in MySQL

SELECT * FROM items WHERE `items.xml` LIKE '%123456%'

The % operator in LIKE means "anything can be here".

How to play a sound in C#, .NET

For Windows Forms one way is to use the SoundPlayer

private void Button_Click(object sender, EventArgs e)
{
    using (var soundPlayer = new SoundPlayer(@"c:\Windows\Media\chimes.wav")) {
        soundPlayer.Play(); // can also use soundPlayer.PlaySync()
    }
}

MSDN page

This will also work with WPF, but you have other options like using MediaPlayer MSDN page

How to make IPython notebook matplotlib plot inline

I have to agree with foobarbecue (I don't have enough recs to be able to simply insert a comment under his post):

It's now recommended that python notebook isn't started wit the argument --pylab, and according to Fernando Perez (creator of ipythonnb) %matplotlib inline should be the initial notebook command.

See here: http://nbviewer.ipython.org/github/ipython/ipython/blob/1.x/examples/notebooks/Part%203%20-%20Plotting%20with%20Matplotlib.ipynb

How to disable a input in angular2

Demo

make is_edit of type boolean.

<input [disabled]=is_edit id="name" type="text">

export class App {
  name:string;
  is_edit: boolean; 
  constructor() {
    this.name = 'Angular2'
    this.is_edit = true;
  }
}

Can someone explain mappedBy in JPA and Hibernate?

mappedby speaks for itself, it tells hibernate not to map this field. it's already mapped by this field [name="field"].
field is in the other entity (name of the variable in the class not the table in the database)..

If you don't do that, hibernate will map this two relation as it's not the same relation

so we need to tell hibernate to do the mapping in one side only and co-ordinate between them.

what is the most efficient way of counting occurrences in pandas?

Just an addition to the previous answers. Let's not forget that when dealing with real data there might be null values, so it's useful to also include those in the counting by using the option dropna=False (default is True)

An example:

>>> df['Embarked'].value_counts(dropna=False)
S      644
C      168
Q       77
NaN      2

Parse JSON with R

The function fromJSON() in RJSONIO, rjson and jsonlite don't return a simple 2D data.frame for complex nested json objects.

To overcome this you can use tidyjson. It takes in a json and always returns a data.frame. It is currently not availble in CRAN, you can get it here: https://github.com/sailthru/tidyjson

Update: tidyjson is now available in cran, you can install it directly using install.packages("tidyjson")

How to set back button text in Swift

Swift 4.2

If you want to change the navigation bar back button item text, put this in viewDidLoad of the controller BEFORE the one where the back button shows, NOT on the view controller where the back button is visible.

 let backButton = UIBarButtonItem()
 backButton.title = "New Back Button Text"
 self.navigationController?.navigationBar.topItem?.backBarButtonItem = backButton

If you want to change the current navigation bar title text use the code below (note that this becomes the default back text for the NEXT view pushed onto the navigation controller, but this default back text can be overridden by the code above)

 self.title = "Navigation Bar Title"

Alternative to google finance api

I'm way late, but check out Quandl. They have an API for stock prices and fundamentals.

Here's an example call, using Quandl-api download in csv

example:

https://www.quandl.com/api/v1/datasets/WIKI/AAPL.csv?column=4&sort_order=asc&collapse=quarterly&trim_start=2012-01-01&trim_end=2013-12-31

They support these languages. Their source data comes from Yahoo Finance, Google Finance, NSE, BSE, FSE, HKEX, LSE, SSE, TSE and more (see here).

Remove substring from the string

How about str.gsub("subString", "") Check out the Ruby Doc

Difference between "include" and "require" in php

require will throw a PHP Fatal Error if the file cannot be loaded. (Execution stops)

include produces a Warning if the file cannot be loaded. (Execution continues)

Here is a nice illustration of include and require difference:

enter image description here

From: Difference require vs. include php (by Robert; Nov 2012)

Output a NULL cell value in Excel

I've been frustrated by this problem as well. Find/Replace can be helpful though, because if you don't put anything in the "replace" field it will replace with an -actual- NULL. So the steps would be something along the lines of:

1: Place some unique string in your formula in place of the NULL output (i like to use a password-like string)

2: Run your formula

3: Open Find/Replace, and fill in the unique string as the search value. Leave "replace with" blank

4: Replace All

Obviously, this has limitations. It only works when the context allows you to do a find/replace, so for more dynamic formulas this won't help much. But, I figured I'd put it up here anyway.

How to change background Opacity when bootstrap modal is open

use this code

_x000D_
_x000D_
$("#your_modal_id").on("shown.bs.modal", function(){_x000D_
      $('.modal-backdrop.in').css('opacity', '0.9');_x000D_
});
_x000D_
_x000D_
_x000D_

Ruby combining an array into one string

While a bit more cryptic than join, you can also multiply the array by a string.

@arr * " "

Set and Get Methods in java?

Setters and getters are used to replace directly accessing member variables from external classes. if you use a setter and getter in accessing a property, you can include initialization, error checking, complex transformations, etc. Some examples:

private String x;

public void setX(String newX) {
    if (newX == null) {
        x = "";
    } else {
        x = newX;
    }
}

public String getX() {
    if (x == null) {
        return "";
    } else {
       return x;
    }
}

How to use boolean 'and' in Python

Try this:

i = 5
ii = 10
if i == 5 and ii == 10:
      print "i is 5 and ii is 10"

Edit: Oh, and you dont need that semicolon on the last line (edit to remove it from my code).