Programs & Examples On #Message

Facebook messages, JavaScript messages, mobile messages (Android, iOS, windows-phone), etc.

How do I raise the same Exception with a custom message in Python?

The current answer did not work good for me, if the exception is not re-caught the appended message is not shown.

But doing like below both keeps the trace and shows the appended message regardless if the exception is re-caught or not.

try:
  raise ValueError("Original message")
except ValueError as err:
  t, v, tb = sys.exc_info()
  raise t, ValueError(err.message + " Appended Info"), tb

( I used Python 2.7, have not tried it in Python 3 )

Exception in thread "main" java.lang.Error: Unresolved compilation problems

For this error:

Exception in thread "main" java.lang.Error: Unresolved compilation problems:

There are problems with your import or package name.
You can delete the package name or fix import errors

Get all messages from Whatsapp

You can get access to the WhatsApp data base located on the SD card only as a root user I think. if you open "\data\data\com.whatsapp" you will see that "databases" is linked to "\firstboot\sqlite\com.whatsapp\"

Git commit with no commit message

When working on an important code update, if you really need an intermediate safepoint you might just do:

git commit -am'.'

or shorter:

git commit -am.

How to show the "Are you sure you want to navigate away from this page?" when changes committed?

This is an easy way to present the message if any data is input into the form, and not to show the message if the form is submitted:

$(function () {
    $("input, textarea, select").on("input change", function() {
        window.onbeforeunload = window.onbeforeunload || function (e) {
            return "You have unsaved changes.  Do you want to leave this page and lose your changes?";
        };
    });
    $("form").on("submit", function() {
        window.onbeforeunload = null;
    });
})

How to send email to multiple recipients using python smtplib?

The solution below worked for me. It successfully sends an email to multiple recipients, including "CC" and "BCC."

toaddr = ['mailid_1','mailid_2']
cc = ['mailid_3','mailid_4']
bcc = ['mailid_5','mailid_6']
subject = 'Email from Python Code'
fromaddr = 'sender_mailid'
message = "\n  !! Hello... !!"

msg['From'] = fromaddr
msg['To'] = ', '.join(toaddr)
msg['Cc'] = ', '.join(cc)
msg['Bcc'] = ', '.join(bcc)
msg['Subject'] = subject

s.sendmail(fromaddr, (toaddr+cc+bcc) , message)

Problems with entering Git commit message with Vim

I am assuming you are using msys git. If you are, the editor that is popping up to write your commit message is vim. Vim is not friendly at first. You may prefer to switch to a different editor. If you want to use a different editor, look at this answer: How do I use Notepad++ (or other) with msysgit?

If you want to use vim, type i to type in your message. When happy hit ESC. Then type :wq, and git will then be happy.

Or just type git commit -m "your message here" to skip the editor altogether.

jQuery show for 5 seconds then hide

Just as simple as this:

$("#myElem").show("slow").delay(5000).hide("slow");

Reporting Services export to Excel with Multiple Worksheets

As @huttelihut pointed out, this is now possible as of SQL Server 2008 R2 - Read More Here

Prior to 2008 R2 it does't appear possible but MSDN Social has some suggested workarounds.

How to get process ID of background process?

An even simpler way to kill all child process of a bash script:

pkill -P $$

The -P flag works the same way with pkill and pgrep - it gets child processes, only with pkill the child processes get killed and with pgrep child PIDs are printed to stdout.

In java how to get substring from a string till a character c?

or you may try something like

"abc.def.ghi".substring(0,"abc.def.ghi".indexOf(c)-1);

Spring not autowiring in unit tests with JUnit

I'm using JUnit 5 and for me the problem was that I had imported Test from the wrong package:

import org.junit.Test;

Replacing it with the following worked for me:

import org.junit.jupiter.api.Test;

How to replace existing value of ArrayList element in Java

You must use

list.remove(indexYouWantToReplace);

first.

Your elements will become like this. [zero, one, three]

then add this

list.add(indexYouWantedToReplace, newElement)

Your elements will become like this. [zero, one, new, three]

jQuery datepicker to prevent past date

Give zero to mindate and it'll disabale past dates.

$( "#datepicker" ).datepicker({ minDate: 0});

Live example

read more here

Mysql SELECT CASE WHEN something then return field

You are mixing the 2 different CASE syntaxes inappropriately.

Use this style (Searched)

  CASE  
  WHEN u.nnmu ='0' THEN mu.naziv_mesta
  WHEN u.nnmu ='1' THEN m.naziv_mesta
 ELSE 'GRESKA'
 END as mesto_utovara,

Or this style (Simple)

  CASE u.nnmu 
  WHEN '0' THEN mu.naziv_mesta
  WHEN '1' THEN m.naziv_mesta
 ELSE 'GRESKA'
 END as mesto_utovara,

Not This (Simple but with boolean search predicates)

  CASE u.nnmu 
  WHEN u.nnmu ='0' THEN mu.naziv_mesta
  WHEN u.nnmu ='1' THEN m.naziv_mesta
 ELSE 'GRESKA'
 END as mesto_utovara,

In MySQL this will end up testing whether u.nnmu is equal to the value of the boolean expression u.nnmu ='0' itself. Regardless of whether u.nnmu is 1 or 0 the result of the case expression itself will be 1

For example if nmu = '0' then (nnmu ='0') evaluates as true (1) and (nnmu ='1') evaluates as false (0). Substituting these into the case expression gives

 SELECT CASE  '0'
  WHEN 1 THEN '0'
  WHEN 0 THEN '1'
 ELSE 'GRESKA'
 END as mesto_utovara

if nmu = '1' then (nnmu ='0') evaluates as false (0) and (nnmu ='1') evaluates as true (1). Substituting these into the case expression gives

 SELECT CASE  '1'
  WHEN 0 THEN '0'
  WHEN 1 THEN '1'
 ELSE 'GRESKA'
 END as mesto_utovara

How can I nullify css property?

You need to provide a selector with higher specificity than the one in Main.css. With that selector, set the values of the properties you want to their default, e.g.

body .c1 {
    height: auto;
}

There is no "default" value that will work for all properties, you need to look up what the default is for each one and use that.

Numeric for loop in Django templates

I've used a simple technique that works nicely for small cases with no special tags and no additional context. Sometimes this comes in handy

{% for i in '0123456789'|make_list %}
    {{ forloop.counter }}
{% endfor %}

Recording video feed from an IP camera over a network

about 3 years ago i needed cctv. I found zoneminder, tried to edit it to my liking, but found i was fixing it more than editing it.

Not to mention mp4 recording feature isn't actually part of the master branch (which is kind of lol, since its a cctv program and its already been about 3 years or more since it was suggested). Its literally just adapting the ffmpeg command lol.

So i found the solution!

If you want something done right, do it yourself.

I present to you Shinobi! Shinobi : The Open Source CCTV Platform

enter image description here

Algorithm to generate all possible permutations of a list?

Wikipedia's answer for "lexicographic order" seems perfectly explicit in cookbook style to me. It cites a 14th century origin for the algorithm!

I've just written a quick implementation in Java of Wikipedia's algorithm as a check and it was no trouble. But what you have in your Q as an example is NOT "list all permutations", but "a LIST of all permutations", so wikipedia won't be a lot of help to you. You need a language in which lists of permutations are feasibly constructed. And believe me, lists a few billion long are not usually handled in imperative languages. You really want a non-strict functional programming language, in which lists are a first-class object, to get out stuff while not bringing the machine close to heat death of the Universe.

That's easy. In standard Haskell or any modern FP language:

-- perms of a list
perms :: [a] -> [ [a] ]
perms (a:as) = [bs ++ a:cs | perm <- perms as, (bs,cs) <- splits perm]
perms []     = [ [] ]

and

-- ways of splitting a list into two parts
splits :: [a] -> [ ([a],[a]) ]
splits []     = [ ([],[]) ]
splits (a:as) = ([],a:as) : [(a:bs,cs) | (bs,cs) <- splits as]

Remove a prefix from a string

Short and sweet:

def remove_prefix(text, prefix):
    return text[text.startswith(prefix) and len(prefix):]

"No such file or directory" but it exists

I had the same problem with a file that I've created on my mac. If I try to run it in a shell with ./filename I got the file not found error message. I think that something was wrong with the file.

what I've done:

open a ssh session to the server
cat filename
copy the output to the clipboard
rm filename
touch filename
vi filename
i for insert mode
paste the content from the clipboard
ESC to end insert mode
:wq!

This worked for me.

Why is visible="false" not working for a plain html table?

Who "they"? I don't think there's a visible attribute in html.

Integrating Dropzone.js into existing HTML form with other fields

Here is my sample, is based on Django + Dropzone. View has select(required) and submit.

<form action="/share/upload/" class="dropzone" id="uploadDropzone">
    {% csrf_token %}
        <select id="warehouse" required>
            <option value="">Select a warehouse</option>
                {% for warehouse in warehouses %}
                    <option value={{forloop.counter0}}>{{warehouse.warehousename}}</option>
                {% endfor %}
        </select>
    <button id="submit-upload btn" type="submit">upload</button>
</form>

<script src="{% static '/js/libs/dropzone/dropzone.js' %}"></script>
<script src="https://code.jquery.com/jquery-3.1.0.min.js"></script>
<script>
    var filename = "";

    Dropzone.options.uploadDropzone = {
        paramName: "file",  // The name that will be used to transfer the file,
        maxFilesize: 250,   // MB
        autoProcessQueue: false,
        accept: function(file, done) {
            console.log(file.name);
            filename = file.name;
            done();    // !Very important
        },
        init: function() {
            var myDropzone = this,
            submitButton = document.querySelector("[type=submit]");

            submitButton.addEventListener('click', function(e) {
                var isValid = document.querySelector('#warehouse').reportValidity();
                e.preventDefault();
                e.stopPropagation();
                if (isValid)
                    myDropzone.processQueue();
            });

            this.on('sendingmultiple', function(data, xhr, formData) {
                formData.append("warehouse", jQuery("#warehouse option:selected").val());
            });
        }
    };
</script>

CSS two div width 50% in one line with line break in file

basically inline-table is for element table, I guess what you really need here is inline-block, if you have to use inline-table anyway, try it this way:

<div style="width:50%; display:inline-table;">A</div><!--
--><div style="width:50%; display:inline-table;">B</div>

Get Request and Session Parameters and Attributes from JSF pages

You can like this:

#{requestScope["paramName"]} ,#{sessionScope["paramName"]}

Because requestScope or sessionScope is a Map object.

How to clear the entire array?

It is as simple as :

Erase aFirstArray

Azure SQL Database "DTU percentage" metric

A DTU is a unit of measure for the performance of a service tier and is a summary of several database characteristics. Each service tier has a certain number of DTUs assigned to it as an easy way to compare the performance level of one tier versus another.

Database Throughput Unit (DTU): DTUs provide a way to describe the relative capacity of a performance level of Basic, Standard, and Premium databases. DTUs are based on a blended measure of CPU, memory, reads, and writes. As DTUs increase, the power offered by the performance level increases. For example, a performance level with 5 DTUs has five times more power than a performance level with 1 DTU. A maximum DTU quota applies to each server.

The DTU Quota applies to the server, not the individual databases and each server has a maximum of 1600 DTUs. The DTU% is the percentage of units your particular database is using and it seems that this number can go over 100% of the DTU rating of the service tier (I assume to the limit of the server). This percentage number is designed to help you choose the appropriate service tier.

From down toward the bottom of this announcement:

For example, if your DTU consumption shows a value of 80%, it indicates it is consuming DTU at the rate of 80% of the limit an S2 database would have. If you see values greater than 100% in this view it means that you need a performance tier larger than S2.

As an example, let’s say you see a percentage value of 300%. This tells you that you are using three times more resources than would be available in an S2. To determine a reasonable starting size, compare the DTUs available in an S2 (50 DTUs) with the next higher sizes (P1 = 100 DTUs, or 200% of S2, P2 = 200 DTUs or 400% of S2). Because you are at 300% of S2 you would want to start with a P2 and re-test.

mysql: SOURCE error 2?

Just use the absolute path of the file and then, instead of using backslashes, use forward slashes.

Example:

with backslashes : source C:\folder1\metropolises.sql
with forward slashes : source C:/folder1/metropolises.sql

What is the difference between JOIN and UNION?

Union Operation is combined result of the Vertical Aggregate of the rows, Union Operation is combined result of the Horizontal Aggregate of the Columns.

Get Substring between two characters using javascript

I like this method:

var str = 'MyLongString:StringIWant;';
var tmpStr  = str.match(":(.*);");
var newStr = tmpStr[1];
//newStr now contains 'StringIWant'

How to convert a std::string to const char* or char*?

If you just want to pass a std::string to a function that needs const char* you can use

std::string str;
const char * c = str.c_str();

If you want to get a writable copy, like char *, you can do that with this:

std::string str;
char * writable = new char[str.size() + 1];
std::copy(str.begin(), str.end(), writable);
writable[str.size()] = '\0'; // don't forget the terminating 0

// don't forget to free the string after finished using it
delete[] writable;

Edit: Notice that the above is not exception safe. If anything between the new call and the delete call throws, you will leak memory, as nothing will call delete for you automatically. There are two immediate ways to solve this.

boost::scoped_array

boost::scoped_array will delete the memory for you upon going out of scope:

std::string str;
boost::scoped_array<char> writable(new char[str.size() + 1]);
std::copy(str.begin(), str.end(), writable.get());
writable[str.size()] = '\0'; // don't forget the terminating 0

// get the char* using writable.get()

// memory is automatically freed if the smart pointer goes 
// out of scope

std::vector

This is the standard way (does not require any external library). You use std::vector, which completely manages the memory for you.

std::string str;
std::vector<char> writable(str.begin(), str.end());
writable.push_back('\0');

// get the char* using &writable[0] or &*writable.begin()

Sending SOAP request using Python Requests

It is indeed possible.

Here is an example calling the Weather SOAP Service using plain requests lib:

import requests
url="http://wsf.cdyne.com/WeatherWS/Weather.asmx?WSDL"
#headers = {'content-type': 'application/soap+xml'}
headers = {'content-type': 'text/xml'}
body = """<?xml version="1.0" encoding="UTF-8"?>
         <SOAP-ENV:Envelope xmlns:ns0="http://ws.cdyne.com/WeatherWS/" xmlns:ns1="http://schemas.xmlsoap.org/soap/envelope/" 
            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
            <SOAP-ENV:Header/>
              <ns1:Body><ns0:GetWeatherInformation/></ns1:Body>
         </SOAP-ENV:Envelope>"""

response = requests.post(url,data=body,headers=headers)
print response.content

Some notes:

  • The headers are important. Most SOAP requests will not work without the correct headers. application/soap+xml is probably the more correct header to use (but the weatherservice prefers text/xml
  • This will return the response as a string of xml - you would then need to parse that xml.
  • For simplicity I have included the request as plain text. But best practise would be to store this as a template, then you can load it using jinja2 (for example) - and also pass in variables.

For example:

from jinja2 import Environment, PackageLoader
env = Environment(loader=PackageLoader('myapp', 'templates'))
template = env.get_template('soaprequests/WeatherSericeRequest.xml')
body = template.render()

Some people have mentioned the suds library. Suds is probably the more correct way to be interacting with SOAP, but I often find that it panics a little when you have WDSLs that are badly formed (which, TBH, is more likely than not when you're dealing with an institution that still uses SOAP ;) ).

You can do the above with suds like so:

from suds.client import Client
url="http://wsf.cdyne.com/WeatherWS/Weather.asmx?WSDL"
client = Client(url)
print client ## shows the details of this service

result = client.service.GetWeatherInformation() 
print result 

Note: when using suds, you will almost always end up needing to use the doctor!

Finally, a little bonus for debugging SOAP; TCPdump is your friend. On Mac, you can run TCPdump like so:

sudo tcpdump -As 0 

This can be helpful for inspecting the requests that actually go over the wire.

The above two code snippets are also available as gists:

SQL Query to add a new column after an existing column in SQL Server 2005

Microsoft SQL (AFAIK) does not allow you to alter the table and add a column after a specific column. Your best bet is using Sql Server Management Studio, or play around with either dropping and re-adding the table, or creating a new table and moving the data over manually. neither are very graceful.

MySQL does however:

ALTER TABLE mytable
ADD COLUMN  new_column <type>
AFTER       existing_column

The RPC server is unavailable. (Exception from HRESULT: 0x800706BA)

My problem turned out to be blank spaces in the txt file that I was using to feed the WMI Powershell script.

How to hide Bootstrap previous modal when you opening new one?

You hide Bootstrap modals with:

$('#modal').modal('hide');

Saying $().hide() makes the matched element invisible, but as far as the modal-related code is concerned, it's still there. See the Methods section in the Modals documentation.

How can I calculate the difference between two dates?

If you want all the units, not just the biggest one, use one of these 2 methods (based on @Ankish's answer):

Example output: 28 D | 23 H | 59 M | 59 S

+ (NSString *) remaningTime:(NSDate *)startDate endDate:(NSDate *)endDate
{
    NSCalendarUnit units = NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;
    NSDateComponents *components = [[NSCalendar currentCalendar] components:units fromDate: startDate toDate: endDate options: 0];
    return [NSString stringWithFormat:@"%ti D | %ti H | %ti M | %ti S", [components day], [components hour], [components minute], [components second]];
}

+ (NSString *) timeFromNowUntil:(NSDate *)endDate
{
    return [self remaningTime:[NSDate date] endDate:endDate];
}

How do I resize a Google Map with JavaScript after it has loaded?

for Google Maps v3, you need to trigger the resize event differently:

google.maps.event.trigger(map, "resize");

See the documentation for the resize event (you'll need to search for the word 'resize'): http://code.google.com/apis/maps/documentation/v3/reference.html#event


Update

This answer has been here a long time, so a little demo might be worthwhile & although it uses jQuery, there's no real need to do so.

_x000D_
_x000D_
$(function() {
  var mapOptions = {
    zoom: 8,
    center: new google.maps.LatLng(-34.397, 150.644)
  };
  var map = new google.maps.Map($("#map-canvas")[0], mapOptions);

  // listen for the window resize event & trigger Google Maps to update too
  $(window).resize(function() {
    // (the 'map' here is the result of the created 'var map = ...' above)
    google.maps.event.trigger(map, "resize");
  });
});
_x000D_
html,
body {
  height: 100%;
}
#map-canvas {
  min-width: 200px;
  width: 50%;
  min-height: 200px;
  height: 80%;
  border: 1px solid blue;
}
_x000D_
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://maps.googleapis.com/maps/api/js?v=3.exp&dummy=.js"></script>
Google Maps resize demo
<div id="map-canvas"></div>
_x000D_
_x000D_
_x000D_

UPDATE 2018-05-22

With a new renderer release in version 3.32 of Maps JavaScript API the resize event is no longer a part of Map class.

The documentation states

When the map is resized, the map center is fixed

  • The full-screen control now preserves center.

  • There is no longer any need to trigger the resize event manually.

source: https://developers.google.com/maps/documentation/javascript/new-renderer

google.maps.event.trigger(map, "resize"); doesn't have any effect starting from version 3.32

Ansible: get current target host's IP address

Just use ansible_ssh_host variable

playbook_example.yml

- hosts: host1
  tasks:
  - name: Show host's ip
    debug:
      msg: "{{ ansible_ssh_host }}"

hosts.yml

[hosts]
host1   ansible_host=1.2.3.4

Result

TASK [Show host's ip] *********************************************************************************************************************************************************************************************
ok: [host1] => {
     "msg": "1.2.3.4"
}

JAVA_HOME does not point to the JDK

I met this issue in rhel, my "JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk"(which is a symbolic link), and ant complains.

MY solution for this is to use the real jdk path in JAVA_HOME, like:

JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.161-0.b14.el7_4.x86_64

It works for me.

In Python, when to use a Dictionary, List or Set?

Although this doesn't cover sets, it is a good explanation of dicts and lists:

Lists are what they seem - a list of values. Each one of them is numbered, starting from zero - the first one is numbered zero, the second 1, the third 2, etc. You can remove values from the list, and add new values to the end. Example: Your many cats' names.

Dictionaries are similar to what their name suggests - a dictionary. In a dictionary, you have an 'index' of words, and for each of them a definition. In python, the word is called a 'key', and the definition a 'value'. The values in a dictionary aren't numbered - tare similar to what their name suggests - a dictionary. In a dictionary, you have an 'index' of words, and for each of them a definition. The values in a dictionary aren't numbered - they aren't in any specific order, either - the key does the same thing. You can add, remove, and modify the values in dictionaries. Example: telephone book.

http://www.sthurlow.com/python/lesson06/

What are OLTP and OLAP. What is the difference between them?

OLTP: It stands for OnLine Transaction Processing and is used for managing current day to day data information.
OLAP: It stands for OnLine Analytical Processing and is used to maintain the past history of data and mainly used for data analysis, it can also be referred to as warehouse.

How do you delete all text above a certain line

Providing you know these vim commands:

1G -> go to first line in file
G -> go to last line in file

then, the following make more sense, are more unitary and easier to remember IMHO:

d1G -> delete starting from the line you are on, to the first line of file
dG -> delete starting from the line you are on, to the last line of file

Cheers.

To find first N prime numbers in python

Until we have N primes, take natural numbers one by one, check whether any of the so-far-collected-primes divide it.

If none does, "yay", we have a new prime...

that's it.

>>> def generate_n_primes(N):
...     primes  = []
...     chkthis = 2
...     while len(primes) < N:
...         ptest    = [chkthis for i in primes if chkthis%i == 0]
...         primes  += [] if ptest else [chkthis]
...         chkthis += 1
...     return primes
...
>>> print generate_n_primes(15)
[2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47]

LINQ: combining join and group by

Once you've done this

group p by p.SomeId into pg  

you no longer have access to the range variables used in the initial from. That is, you can no longer talk about p or bp, you can only talk about pg.

Now, pg is a group and so contains more than one product. All the products in a given pg group have the same SomeId (since that's what you grouped by), but I don't know if that means they all have the same BaseProductId.

To get a base product name, you have to pick a particular product in the pg group (As you are doing with SomeId and CountryCode), and then join to BaseProducts.

var result = from p in Products                         
 group p by p.SomeId into pg                         
 // join *after* group
 join bp in BaseProducts on pg.FirstOrDefault().BaseProductId equals bp.Id         
 select new ProductPriceMinMax { 
       SomeId = pg.FirstOrDefault().SomeId, 
       CountryCode = pg.FirstOrDefault().CountryCode, 
       MinPrice = pg.Min(m => m.Price), 
       MaxPrice = pg.Max(m => m.Price),
       BaseProductName = bp.Name  // now there is a 'bp' in scope
 };

That said, this looks pretty unusual and I think you should step back and consider what you are actually trying to retrieve.

Add custom headers to WebView resource requests - android

This works for me:

  1. First you need to create method, which will be returns your headers you want to add to request:

    private Map<String, String> getCustomHeaders()
    {
        Map<String, String> headers = new HashMap<>();
        headers.put("YOURHEADER", "VALUE");
        return headers;
    }
    
  2. Second you need to create WebViewClient:

    private WebViewClient getWebViewClient()
    {
    
        return new WebViewClient()
        {
    
        @Override
        @TargetApi(Build.VERSION_CODES.LOLLIPOP)
        public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request)
        {
            view.loadUrl(request.getUrl().toString(), getCustomHeaders());
            return true;
        }
    
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url)
        {
            view.loadUrl(url, getCustomHeaders());
            return true;
        }
    };
    }
    
  3. Add WebViewClient to your WebView:

    webView.setWebViewClient(getWebViewClient());
    

Hope this helps.

Multiple Python versions on the same machine?

Package Managers - user-level

For a package manager that can install and manage multiple versions of python, these are good choices:

  • pyenv - only able to install and manage versions of python
  • asdf - able to install and manage many different languages

The advantages to these package managers is that it may be easier to set them up and install multiple versions of python with them than it is to install python from source. They also provide commands for easily changing the available python version(s) using shims and setting the python version per-directory.

This disadvantage is that, by default, they are installed at the user-level (inside your home directory) and require a little bit of user-level configuration - you'll need to edit your ~/.profile and ~/.bashrc or similar files. This means that it is not easy to use them to install multiple python versions globally for all users. In order to do this, you can install from source alongside the OS's existing python version.


Installation from source - system-wide

You'll need root privileges for this method.

See the official python documentation for building from source for additional considerations and options.

/usr/local is the designated location for a system administrator to install shared (system-wide) software, so it's subdirectories are a good place to download the python source and install. See section 4.9 of the Linux Foundation's File Hierarchy Standard.

Install any build dependencies. On Debian-based systems, use:

apt update
apt install build-essential zlib1g-dev libncurses5-dev libgdbm-dev libnss3-dev libssl-dev libsqlite3-dev libreadline-dev libffi-dev libbz2-dev

Choose which python version you want to install. See the Python Source Releases page for a listing.

Download and unzip file in /usr/local/src, replacing X.X.X below with the python version (i.e. 3.8.2).

cd /usr/local/src
wget https://www.python.org/ftp/python/X.X.X/Python-X.X.X.tgz
tar vzxf Python-X.X.X.tgz

Before building and installing, set the CFLAGS environment variable with C compiler flags necessary (see GNU's make documentation). This is usually not necessary for general use, but if, for example, you were going to create a uWSGI plugin with this python version, you might want to set the flags, -fPIC, with the following:

export CFLAGS='-fPIC'

Change the working directory to the unzipped python source directory, and configure the build. You'll probably want to use the --enable-optimizations option on the ./configure command for profile guided optimization. Use --prefix=/usr/local to install to the proper subdirectories (/usr/local/bin, /usr/local/lib, etc.).

cd Python-X.X.X
./configure --enable-optimizations --prefix=/usr/local

Build the project with make and install with make altinstall to avoid overriding any files when installing multiple versions. See the warning on this page of the python build documentation.

make -j 4
make altinstall

Then you should be able to run your new python and pip versions with pythonX.X and pipX.X (i.e python3.8 and pip3.8). Note that if the minor version of your new installation is the same as the OS's version (for example if you were installing python3.8.4 and the OS used python3.8.2), then you would need to specify the entire path (/usr/local/bin/pythonX.X) or set an alias to use this version.

Writing a pandas DataFrame to CSV file

it could be not the answer for this case, but as I had the same error-message with .to_csvI tried .toCSV('name.csv') and the error-message was different ("SparseDataFrame' object has no attribute 'toCSV'). So the problem was solved by turning dataframe to dense dataframe

df.to_dense().to_csv("submission.csv", index = False, sep=',', encoding='utf-8')

Could not connect to Redis at 127.0.0.1:6379: Connection refused with homebrew

In my case, it was the password that contained some characters like ', after changing it the server started without problems.

Internal Error 500 Apache, but nothing in the logs?

The answers by @eric-leschinski is correct.

But there is another case if your Server API is FPM/FastCGI (Default on Centos 8 or you can check use phpinfo() function)

In this case:

  1. Run phpinfo() in a php file;
  2. Looking for Loaded Configuration File param to see where is config file for your PHP.
  3. Edit config file like @eric-leschinski 's answer.
  4. Check Server API param. If your server only use apache handle API -> restart apache. If your server use php-fpm you must restart php-fpm service

    systemctl restart php-fpm

    Check the log file in php-fpm log folder. eg /var/log/php-fpm/www-error.log

CSS display:table-row does not expand when width is set to 100%

You can nest table-cell directly within table. You muslt have a table. Starting eith table-row does not work. Try it with this HTML:

<html>
  <head>
    <style type="text/css">
.table {
  display: table;
  width: 100%;
}
.tr {
  display: table-row;
  width: 100%;
}
.td {
  display: table-cell;
}
    </style>
  </head>
  <body>

    <div class="table">
      <div class="tr">
        <div class="td">
          X
        </div>
        <div class="td">
          X
        </div>
        <div class="td">
          X
        </div>
      </div>
    </div>

      <div class="tr">
        <div class="td">
          X
        </div>
        <div class="td">
          X
        </div>
        <div class="td">
          X
        </div>
      </div>

    <div class="table">
        <div class="td">
          X
        </div>
        <div class="td">
          X
        </div>
        <div class="td">
          X
        </div>
    </div>

  </body>
</html>

How to download a Nuget package without nuget.exe or Visual Studio extension?

I haven't tried it yet, but it looks like NuGet Package Explorer should be able to do it:

https://github.com/NuGetPackageExplorer/NuGetPackageExplorer

NuGet Package Explorer

(or like Colonel Panic says, 7-zip should probably do it)

Error: " 'dict' object has no attribute 'iteritems' "

As you are in python3 , use dict.items() instead of dict.iteritems()

iteritems() was removed in python3, so you can't use this method anymore.

Take a look at Python 3.0 Wiki Built-in Changes section, where it is stated:

Removed dict.iteritems(), dict.iterkeys(), and dict.itervalues().

Instead: use dict.items(), dict.keys(), and dict.values() respectively.

Numpy converting array from float to strings

If the main problem is the loss of precision when converting from a float to a string, one possible way to go is to convert the floats to the decimalS: http://docs.python.org/library/decimal.html.

In python 2.7 and higher you can directly convert a float to a decimal object.

.prop() vs .attr()

A property is in the DOM; an attribute is in the HTML that is parsed into the DOM.

Further detail

If you change an attribute, the change will be reflected in the DOM (sometimes with a different name).

Example: Changing the class attribute of a tag will change the className property of that tag in the DOM. If you have no attribute on a tag, you still have the corresponding DOM property with an empty or a default value.

Example: While your tag has no class attribute, the DOM property className does exist with a empty string value.

edit

If you change the one, the other will be changed by a controller, and vice versa. This controller is not in jQuery, but in the browser's native code.

How does one create an InputStream from a String?

Java 7+

It's possible to take advantage of the StandardCharsets JDK class:

String str=...
InputStream is = new ByteArrayInputStream(StandardCharsets.UTF_16.encode(str).array());

When to use 'raise NotImplementedError'?

As Uriel says, it is meant for a method in an abstract class that should be implemented in child class, but can be used to indicate a TODO as well.

There is an alternative for the first use case: Abstract Base Classes. Those help creating abstract classes.

Here's a Python 3 example:

class C(abc.ABC):
    @abc.abstractmethod
    def my_abstract_method(self, ...):
        ...

When instantiating C, you'll get an error because my_abstract_method is abstract. You need to implement it in a child class.

TypeError: Can't instantiate abstract class C with abstract methods my_abstract_method

Subclass C and implement my_abstract_method.

class D(C):
    def my_abstract_method(self, ...):
        ...

Now you can instantiate D.

C.my_abstract_method does not have to be empty. It can be called from D using super().

An advantage of this over NotImplementedError is that you get an explicit Exception at instantiation time, not at method call time.

Easiest way to toggle 2 classes in jQuery

The easiest solution is to toggleClass() both classes individually.

Let's say you have an icon:

    <i id="target" class="fa fa-angle-down"></i>

To toggle between fa-angle-down and fa-angle-up do the following:

    $('.sometrigger').click(function(){
        $('#target').toggleClass('fa-angle-down');
        $('#target').toggleClass('fa-angle-up');
    });

Since we had fa-angle-down at the beginning without fa-angle-up each time you toggle both, one leaves for the other to appear.

How can I generate a self-signed certificate with SubjectAltName using OpenSSL?

Can someone help me with the exact syntax?

It's a three-step process, and it involves modifying the openssl.cnf file. You might be able to do it with only command line options, but I don't do it that way.

Find your openssl.cnf file. It is likely located in /usr/lib/ssl/openssl.cnf:

$ find /usr/lib -name openssl.cnf
/usr/lib/openssl.cnf
/usr/lib/openssh/openssl.cnf
/usr/lib/ssl/openssl.cnf

On my Debian system, /usr/lib/ssl/openssl.cnf is used by the built-in openssl program. On recent Debian systems it is located at /etc/ssl/openssl.cnf

You can determine which openssl.cnf is being used by adding a spurious XXX to the file and see if openssl chokes.


First, modify the req parameters. Add an alternate_names section to openssl.cnf with the names you want to use. There are no existing alternate_names sections, so it does not matter where you add it.

[ alternate_names ]

DNS.1        = example.com
DNS.2        = www.example.com
DNS.3        = mail.example.com
DNS.4        = ftp.example.com

Next, add the following to the existing [ v3_ca ] section. Search for the exact string [ v3_ca ]:

subjectAltName      = @alternate_names

You might change keyUsage to the following under [ v3_ca ]:

keyUsage = digitalSignature, keyEncipherment

digitalSignature and keyEncipherment are standard fare for a server certificate. Don't worry about nonRepudiation. It's a useless bit thought up by computer science guys/gals who wanted to be lawyers. It means nothing in the legal world.

In the end, the IETF (RFC 5280), browsers and CAs run fast and loose, so it probably does not matter what key usage you provide.


Second, modify the signing parameters. Find this line under the CA_default section:

# Extension copying option: use with caution.
# copy_extensions = copy

And change it to:

# Extension copying option: use with caution.
copy_extensions = copy

This ensures the SANs are copied into the certificate. The other ways to copy the DNS names are broken.


Third, generate your self-signed certificate:

$ openssl genrsa -out private.key 3072
$ openssl req -new -x509 -key private.key -sha256 -out certificate.pem -days 730
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
...

Finally, examine the certificate:

$ openssl x509 -in certificate.pem -text -noout
Certificate:
    Data:
        Version: 3 (0x2)
        Serial Number: 9647297427330319047 (0x85e215e5869042c7)
    Signature Algorithm: sha256WithRSAEncryption
        Issuer: C=US, ST=MD, L=Baltimore, O=Test CA, Limited, CN=Test CA/[email protected]
        Validity
            Not Before: Feb  1 05:23:05 2014 GMT
            Not After : Feb  1 05:23:05 2016 GMT
        Subject: C=US, ST=MD, L=Baltimore, O=Test CA, Limited, CN=Test CA/[email protected]
        Subject Public Key Info:
            Public Key Algorithm: rsaEncryption
                Public-Key: (3072 bit)
                Modulus:
                    00:e2:e9:0e:9a:b8:52:d4:91:cf:ed:33:53:8e:35:
                    ...
                    d6:7d:ed:67:44:c3:65:38:5d:6c:94:e5:98:ab:8c:
                    72:1c:45:92:2c:88:a9:be:0b:f9
                Exponent: 65537 (0x10001)
        X509v3 extensions:
            X509v3 Subject Key Identifier:
                34:66:39:7C:EC:8B:70:80:9E:6F:95:89:DB:B5:B9:B8:D8:F8:AF:A4
            X509v3 Authority Key Identifier:
                keyid:34:66:39:7C:EC:8B:70:80:9E:6F:95:89:DB:B5:B9:B8:D8:F8:AF:A4

            X509v3 Basic Constraints: critical
                CA:FALSE
            X509v3 Key Usage:
                Digital Signature, Non Repudiation, Key Encipherment, Certificate Sign
            X509v3 Subject Alternative Name:
                DNS:example.com, DNS:www.example.com, DNS:mail.example.com, DNS:ftp.example.com
    Signature Algorithm: sha256WithRSAEncryption
         3b:28:fc:e3:b5:43:5a:d2:a0:b8:01:9b:fa:26:47:8e:5c:b7:
         ...
         71:21:b9:1f:fa:30:19:8b:be:d2:19:5a:84:6c:81:82:95:ef:
         8b:0a:bd:65:03:d1

How to run a hello.js file in Node.js on windows?

another simple way

  1. download nodejs to your system
  2. open a notepad write js command "console.log('Hello World');"
  3. save the file as hello.js preferably same location as nodejs
  4. open command prompt navigate to the location where the nodejs is located
    c:\program files\nodejs
  5. and run the command from the location like c:\program files\nodejs>node hello.js
  6. in case the js file in another location give the path of file c:\program files\nodejs>node path\hello.js

The network path was not found

Possibly also check the sessionState tag in Web.config

Believe it or not, some projects I've worked on will set a connection string here as well.

Setting this config to:

<sessionState mode="InProc" />

Fixed this issue in my case after checking all other connection strings were correct.

Location of Django logs and errors

Add to your settings.py:

LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'handlers': {
        'file': {
            'level': 'DEBUG',
            'class': 'logging.FileHandler',
            'filename': 'debug.log',
        },
    },
    'loggers': {
        'django': {
            'handlers': ['file'],
            'level': 'DEBUG',
            'propagate': True,
        },
    },
}

And it will create a file called debug.log in the root of your. https://docs.djangoproject.com/en/1.10/topics/logging/

Embedding JavaScript engine into .NET

i believe all the major opensource JS engines (JavaScriptCore, SpiderMonkey, V8, and KJS) provide embedding APIs. The only one I am actually directly familiar with is JavaScriptCore (which is name of the JS engine the SquirrelFish lives in) which provides a pure C API. If memory serves (it's been a while since i used .NET) .NET has fairly good support for linking in C API's.

I'm honestly not sure what the API's for the other engines are like, but I do know that they all provide them.

That said, depending on your purposes JScript.NET may be best, as all of these other engines will require you to include them with your app, as JSC is the only one that actually ships with an OS, but that OS is MacOS :D

How do I move files in node.js?

Just my 2 cents as stated in the answer above : The copy() method shouldn't be used as-is for copying files without a slight adjustment:

function copy(callback) {
    var readStream = fs.createReadStream(oldPath);
    var writeStream = fs.createWriteStream(newPath);

    readStream.on('error', callback);
    writeStream.on('error', callback);

    // Do not callback() upon "close" event on the readStream
    // readStream.on('close', function () {
    // Do instead upon "close" on the writeStream
    writeStream.on('close', function () {
        callback();
    });

    readStream.pipe(writeStream);
}

The copy function wrapped in a Promise:

function copy(oldPath, newPath) {
  return new Promise((resolve, reject) => {
    const readStream = fs.createReadStream(oldPath);
    const writeStream = fs.createWriteStream(newPath);

    readStream.on('error', err => reject(err));
    writeStream.on('error', err => reject(err));

    writeStream.on('close', function() {
      resolve();
    });

    readStream.pipe(writeStream);
  })

However, keep in mind that the filesystem might crash if the target folder doesn't exist.

Deleting queues in RabbitMQ

Hopefully it might help someone.

I tried the above pieces of code but I did not do any streaming.

sudo rabbitmqctl list_queues | awk '{print $1}' > queues.txt; for line in $(cat queues.txt); do sudo rabbitmqctl delete_queue "$line"; done.

I generate a file that contains all the queue names and loops through it line by line to the delete them. For the loops, while read ... did not do it for me. It was always stopping at the first queue name.

Also, if you want to delete a single queue, the above solutions will help(python, Java ...) and also do sudo rabbitmqctl delete_queue queue_name. I am using rabbitmqctl instead of rabbitmqadmin.

How to post JSON to a server using C#?

I recently came up with a much simpler way to post a JSON, with the additional step of converting from a model in my app. Note that you have to make the model [JsonObject] for your controller to get the values and do the conversion.

Request:

 var model = new MyModel(); 

 using (var client = new HttpClient())
 {
     var uri = new Uri("XXXXXXXXX"); 
     var json = new JavaScriptSerializer().Serialize(model);
     var stringContent = new StringContent(json, Encoding.UTF8, "application/json");
     var response = await Client.PutAsync(uri,stringContent).Result;
     ...
     ...
  }

Model:

[JsonObject]
[Serializable]
public class MyModel
{
    public Decimal Value { get; set; }
    public string Project { get; set; }
    public string FilePath { get; set; }
    public string FileName { get; set; }
}

Server side:

[HttpPut]     
public async Task<HttpResponseMessage> PutApi([FromBody]MyModel model)
{
    ...
    ... 
}

Creating lowpass filter in SciPy - understanding methods and units

A few comments:

  • The Nyquist frequency is half the sampling rate.
  • You are working with regularly sampled data, so you want a digital filter, not an analog filter. This means you should not use analog=True in the call to butter, and you should use scipy.signal.freqz (not freqs) to generate the frequency response.
  • One goal of those short utility functions is to allow you to leave all your frequencies expressed in Hz. You shouldn't have to convert to rad/sec. As long as you express your frequencies with consistent units, the scaling in the utility functions takes care of the normalization for you.

Here's my modified version of your script, followed by the plot that it generates.

import numpy as np
from scipy.signal import butter, lfilter, freqz
import matplotlib.pyplot as plt


def butter_lowpass(cutoff, fs, order=5):
    nyq = 0.5 * fs
    normal_cutoff = cutoff / nyq
    b, a = butter(order, normal_cutoff, btype='low', analog=False)
    return b, a

def butter_lowpass_filter(data, cutoff, fs, order=5):
    b, a = butter_lowpass(cutoff, fs, order=order)
    y = lfilter(b, a, data)
    return y


# Filter requirements.
order = 6
fs = 30.0       # sample rate, Hz
cutoff = 3.667  # desired cutoff frequency of the filter, Hz

# Get the filter coefficients so we can check its frequency response.
b, a = butter_lowpass(cutoff, fs, order)

# Plot the frequency response.
w, h = freqz(b, a, worN=8000)
plt.subplot(2, 1, 1)
plt.plot(0.5*fs*w/np.pi, np.abs(h), 'b')
plt.plot(cutoff, 0.5*np.sqrt(2), 'ko')
plt.axvline(cutoff, color='k')
plt.xlim(0, 0.5*fs)
plt.title("Lowpass Filter Frequency Response")
plt.xlabel('Frequency [Hz]')
plt.grid()


# Demonstrate the use of the filter.
# First make some data to be filtered.
T = 5.0         # seconds
n = int(T * fs) # total number of samples
t = np.linspace(0, T, n, endpoint=False)
# "Noisy" data.  We want to recover the 1.2 Hz signal from this.
data = np.sin(1.2*2*np.pi*t) + 1.5*np.cos(9*2*np.pi*t) + 0.5*np.sin(12.0*2*np.pi*t)

# Filter the data, and plot both the original and filtered signals.
y = butter_lowpass_filter(data, cutoff, fs, order)

plt.subplot(2, 1, 2)
plt.plot(t, data, 'b-', label='data')
plt.plot(t, y, 'g-', linewidth=2, label='filtered data')
plt.xlabel('Time [sec]')
plt.grid()
plt.legend()

plt.subplots_adjust(hspace=0.35)
plt.show()

lowpass example

Android: how to make keyboard enter button say "Search" and handle its click?

In xml file, put imeOptions="actionSearch" and inputType="text", maxLines="1":

<EditText
    android:id="@+id/search_box"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:hint="@string/search"
    android:imeOptions="actionSearch"
    android:inputType="text"
    android:maxLines="1" />

Swift Bridging Header import issue

I imported in some files from bridgin header files from cocoapods not in a proper way.

Instead of importing

#import <SomeCocoaPod/SomeCocoaPod.h>

I wrote

#import "SomeCocoaPod.h"

And this was my HUGE mistake

Best practice for localization and globalization of strings and labels

As far as I know, there's a good library called localeplanet for Localization and Internationalization in JavaScript. Furthermore, I think it's native and has no dependencies to other libraries (e.g. jQuery)

Here's the website of library: http://www.localeplanet.com/

Also look at this article by Mozilla, you can find very good method and algorithms for client-side translation: http://blog.mozilla.org/webdev/2011/10/06/i18njs-internationalize-your-javascript-with-a-little-help-from-json-and-the-server/

The common part of all those articles/libraries is that they use a i18n class and a get method (in some ways also defining an smaller function name like _) for retrieving/converting the key to the value. In my explaining the key means that string you want to translate and the value means translated string.
Then, you just need a JSON document to store key's and value's.

For example:

var _ = document.webL10n.get;
alert(_('test'));

And here the JSON:

{ test: "blah blah" }

I believe using current popular libraries solutions is a good approach.

How do I POST XML data with curl

I prefer the following command-line options:

cat req.xml | curl -X POST -H 'Content-type: text/xml' -d @- http://www.example.com

or

curl -X POST -H 'Content-type: text/xml' -d @req.xml http://www.example.com

or

curl -X POST -H 'Content-type: text/xml'  -d '<XML>data</XML>' http://www.example.com 

How to convert XML to java.util.Map and vice versa

If you only need to convert simple map to xml, without nested properties, then the lightweight solution would be just a private method, as follows:

private String convertMapToXML(Map<String, String> map) {
    StringBuilder xmlBuilder = new StringBuilder();
    xmlBuilder.append("<xml>");
    for (Map.Entry<String, String> entry : map.entrySet()) {
        if (entry.getValue() != null) {
            String xmlElement = entry.getKey();
            xmlBuilder.append("<");
            xmlBuilder.append(xmlElement);
            xmlBuilder.append(">");
            xmlBuilder.append(entry.getValue());
            xmlBuilder.append("<");
            xmlBuilder.append("/");
            xmlBuilder.append(xmlElement);                
            xmlBuilder.append(">");
        }             
    }

    xmlBuilder.append("</xml>");
    return xmlBuilder.toString();
}

Double value to round up in Java

If you do not want to use DecimalFormat (e.g. due to its efficiency) and you want a general solution, you could also try this method that uses scaled rounding:

public static double roundToDigits(double value, int digitCount) {
    if (digitCount < 0)
        throw new IllegalArgumentException("Digit count must be positive for rounding!");

    double factor = Math.pow(10, digitCount);
    return (double)(Math.round(value * factor)) / factor;
}

Setting action for back button in navigation controller

The solution I have found so far is not very nice, but it works for me. Taking this answer, I also check whether I'm popping programmatically or not:

- (void)viewWillDisappear:(BOOL)animated {
  [super viewWillDisappear:animated];

  if ((self.isMovingFromParentViewController || self.isBeingDismissed)
      && !self.isPoppingProgrammatically) {
    // Do your stuff here
  }
}

You have to add that property to your controller and set it to YES before popping programmatically:

self.isPoppingProgrammatically = YES;
[self.navigationController popViewControllerAnimated:YES];

How to test if a file is a directory in a batch script?

Here is my solution after many tests with if exist, pushd, dir /AD, etc...

@echo off
cd /d C:\
for /f "delims=" %%I in ('dir /a /ogn /b') do (
    call :isdir "%%I"
    if errorlevel 1 (echo F: %%~fI) else echo D: %%~fI
)
cmd/k

:isdir
echo.%~a1 | findstr /b "d" >nul
exit /b %errorlevel%

:: Errorlevel
:: 0 = folder
:: 1 = file or item not found
  • It works with files that have no extension
  • It works with folders named folder.ext
  • It works with UNC path
  • It works with double-quoted full path or with just the dirname or filename only.
  • It works even if you don't have read permissions
  • It works with Directory Links (Junctions).
  • It works with files whose path contains a Directory Link.

How to add row of data to Jtable from values received from jtextfield and comboboxes

Peeskillet's lame tutorial for working with JTables in Netbeans GUI Builder

  • Set the table column headers
    1. Highglight the table in the design view then go to properties pane on the very right. Should be a tab that says "Properties". Make sure to highlight the table and not the scroll pane surrounding it, or the next step wont work
    2. Click on the ... button to the right of the property model. A dialog should appear.
    3. Set rows to 0, set the number of columns you want, and their names.
  • Add a button to the frame somwhere,. This button will be clicked when the user is ready to submit a row

    1. Right-click on the button and select Events -> Action -> actionPerformed
    2. You should see code like the following auto-generated

      private void jButton1ActionPerformed(java.awt.event.ActionEvent) {}
      
  • The jTable1 will have a DefaultTableModel. You can add rows to the model with your data

    private void jButton1ActionPerformed(java.awt.event.ActionEvent) {
        String data1 = something1.getSomething();
        String data2 = something2.getSomething();
        String data3 = something3.getSomething();
        String data4 = something4.getSomething();
    
        Object[] row = { data1, data2, data3, data4 };
    
        DefaultTableModel model = (DefaultTableModel) jTable1.getModel();
    
        model.addRow(row);
    
        // clear the entries.
    }
    

So for every set of data like from a couple text fields, a combo box, and a check box, you can gather that data each time the button is pressed and add it as a row to the model.

Reset Excel to default borders

Another way, There is check box Page Layout tab with Gridlines [ ] View which should be checked.

Page Layout Tab

Super-simple example of C# observer/observable with delegates

I've tied together a couple of the great examples above (thank you as always to Mr. Skeet and Mr. Karlsen) to include a couple of different Observables and utilized an interface to keep track of them in the Observer and allowed the Observer to to "observe" any number of Observables via an internal list:

namespace ObservablePattern
{
    using System;
    using System.Collections.Generic;

    internal static class Program
    {
        private static void Main()
        {
            var observable = new Observable();
            var anotherObservable = new AnotherObservable();

            using (IObserver observer = new Observer(observable))
            {
                observable.DoSomething();
                observer.Add(anotherObservable);
                anotherObservable.DoSomething();
            }

            Console.ReadLine();
        }
    }

    internal interface IObservable
    {
        event EventHandler SomethingHappened;
    }

    internal sealed class Observable : IObservable
    {
        public event EventHandler SomethingHappened;

        public void DoSomething()
        {
            var handler = this.SomethingHappened;

            Console.WriteLine("About to do something.");
            if (handler != null)
            {
                handler(this, EventArgs.Empty);
            }
        }
    }

    internal sealed class AnotherObservable : IObservable
    {
        public event EventHandler SomethingHappened;

        public void DoSomething()
        {
            var handler = this.SomethingHappened;

            Console.WriteLine("About to do something different.");
            if (handler != null)
            {
                handler(this, EventArgs.Empty);
            }
        }
    }

    internal interface IObserver : IDisposable
    {
        void Add(IObservable observable);

        void Remove(IObservable observable);
    }

    internal sealed class Observer : IObserver
    {
        private readonly Lazy<IList<IObservable>> observables =
            new Lazy<IList<IObservable>>(() => new List<IObservable>());

        public Observer()
        {
        }

        public Observer(IObservable observable) : this()
        {
            this.Add(observable);
        }

        public void Add(IObservable observable)
        {
            if (observable == null)
            {
                return;
            }

            lock (this.observables)
            {
                this.observables.Value.Add(observable);
                observable.SomethingHappened += HandleEvent;
            }
        }

        public void Remove(IObservable observable)
        {
            if (observable == null)
            {
                return;
            }

            lock (this.observables)
            {
                observable.SomethingHappened -= HandleEvent;
                this.observables.Value.Remove(observable);
            }
        }

        public void Dispose()
        {
            for (var i = this.observables.Value.Count - 1; i >= 0; i--)
            {
                this.Remove(this.observables.Value[i]);
            }
        }

        private static void HandleEvent(object sender, EventArgs args)
        {
            Console.WriteLine("Something happened to " + sender);
        }
    }
}

Extract first item of each sublist

You could use zip:

>>> lst=[[1,2,3],[11,12,13],[21,22,23]]
>>> zip(*lst)[0]
(1, 11, 21)

Or, Python 3 where zip does not produce a list:

>>> list(zip(*lst))[0]
(1, 11, 21)

Or,

>>> next(zip(*lst))
(1, 11, 21)

Or, (my favorite) use numpy:

>>> import numpy as np
>>> a=np.array([[1,2,3],[11,12,13],[21,22,23]])
>>> a
array([[ 1,  2,  3],
       [11, 12, 13],
       [21, 22, 23]])
>>> a[:,0]
array([ 1, 11, 21])

Saving response from Requests to file

As Peter already pointed out:

In [1]: import requests

In [2]: r = requests.get('https://api.github.com/events')

In [3]: type(r)
Out[3]: requests.models.Response

In [4]: type(r.content)
Out[4]: str

You may also want to check r.text.

Also: https://2.python-requests.org/en/latest/user/quickstart/

PuTTY scripting to log onto host

For me it works this way:

putty -ssh [email protected] 22 -pw password

putty, protocol, user name @ ip address port and password. To connect in less than a second.

Can we add div inside table above every <tr>?

If we follow the w3 org table reference ,and follow the Permitted Contents section, we can see that the table tags takes tbody(optional) and tr as the only permitted contents.

So i reckon it is safe to say we cannot add a div tag which is a flow content as a direct child of the table which i understand is what you meant when you had said above a tr.

Having said that , as we follow the above link , you will find that it is safe to use divs inside the td element as seen here

How to get the first element of the List or Set?

You can use the get(index) method to access an element from a List.

Sets, by definition, simply contain elements and have no particular order. Therefore, there is no "first" element you can get, but it is possible to iterate through it using iterator (using the for each loop) or convert it to an array using the toArray() method.

Favorite Visual Studio keyboard shortcuts

By far the most useful (after Ctrl+Shift+B) are:

  • Ctrl+K, C - to Comment out selection

  • Ctrl+k, U - to Uncomment a selection

Display PDF file inside my android application

Maybe you can integrate MuPdf in your application. Here is I've described how to do this: Integrate MuPDF Reader in an app

Insertion sort vs Bubble Sort Algorithms

Insertion Sort

After i iterations the first i elements are ordered.

In each iteration the next element is bubbled through the sorted section until it reaches the right spot:

sorted  | unsorted
1 3 5 8 | 4 6 7 9 2
1 3 4 5 8 | 6 7 9 2

The 4 is bubbled into the sorted section

Pseudocode:

for i in 1 to n
    for j in i downto 2
        if array[j - 1] > array[j]
            swap(array[j - 1], array[j])
        else
            break

Bubble Sort

After i iterations the last i elements are the biggest, and ordered.

In each iteration, sift through the unsorted section to find the maximum.

unsorted  | biggest
3 1 5 4 2 | 6 7 8 9
1 3 4 2 | 5 6 7 8 9

The 5 is bubbled out of the unsorted section

Pseudocode:

for i in 1 to n
    for j in 1 to n - i
         if array[j] > array[j + 1]
             swap(array[j], array[j + 1])

Note that typical implementations terminate early if no swaps are made during one of the iterations of the outer loop (since that means the array is sorted).

Difference

In insertion sort elements are bubbled into the sorted section, while in bubble sort the maximums are bubbled out of the unsorted section.

Import XXX cannot be resolved for Java SE standard classes

This is an issue relating JRE.In my case (eclipse Luna with Maven plugin, JDK 7) I solved this by making following change in pom.xml and then Maven Update Project.

from:

 <configuration>
        <source>1.8</source>
        <target>1.8</target>
</configuration>

to:

 <configuration>
        <source>1.7</source>
        <target>1.7</target>
</configuration>

Screenshot showing problem in JRE: enter image description here

Export DataTable to Excel File

use this code...

    dt = city.GetAllCity();//your datatable
    string attachment = "attachment; filename=city.xls";
    Response.ClearContent();
    Response.AddHeader("content-disposition", attachment);
    Response.ContentType = "application/vnd.ms-excel";
    string tab = "";
    foreach (DataColumn dc in dt.Columns)
    {
        Response.Write(tab + dc.ColumnName);
        tab = "\t";
    }
    Response.Write("\n");
    int i;
    foreach (DataRow dr in dt.Rows)
    {
        tab = "";
        for (i = 0; i < dt.Columns.Count; i++)
        {
            Response.Write(tab + dr[i].ToString());
            tab = "\t";
        }
        Response.Write("\n");
    }
    Response.End();

How can I convert JSON to a HashMap using Gson?

This is more of addendum to Kevin Dolan's answer than a complete answer, but I was having trouble extracting the type from the Number. This is my solution:

private Object handlePrimitive(JsonPrimitive json) {
  if(json.isBoolean()) {
    return json.getAsBoolean();
  } else if(json.isString())
    return json.getAsString();
  }

  Number num = element.getAsNumber();

  if(num instanceof Integer){
    map.put(fieldName, num.intValue());
  } else if(num instanceof Long){
    map.put(fieldName, num.longValue());
  } else if(num instanceof Float){
    map.put(fieldName, num.floatValue());
  } else {    // Double
     map.put(fieldName, num.doubleValue());
  }
}

How do I protect Python code?

using cxfreeze ( py2exe for linux ) will do the job.

http://cx-freeze.sourceforge.net/

it is available in ubuntu repositories

Access properties file programmatically with Spring?

Create a class like below

    package com.tmghealth.common.util;

    import java.util.Properties;

    import org.springframework.beans.BeansException;

    import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;

    import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;

    import org.springframework.context.annotation.Configuration;

    import org.springframework.context.annotation.PropertySource;

    import org.springframework.stereotype.Component;


    @Component
    @Configuration
    @PropertySource(value = { "classpath:/spring/server-urls.properties" })
    public class PropertiesReader extends PropertyPlaceholderConfigurer {

        @Override
        protected void processProperties(
                ConfigurableListableBeanFactory beanFactory, Properties props)
                throws BeansException {
            super.processProperties(beanFactory, props);

        }

    }

Then wherever you want to access a property use

    @Autowired
        private Environment environment;
    and getters and setters then access using 

    environment.getProperty(envName
                    + ".letter.fdi.letterdetails.restServiceUrl");

-- write getters and setters in the accessor class

    public Environment getEnvironment() {
            return environment;
        }`enter code here`

        public void setEnvironment(Environment environment) {
            this.environment = environment;
        }

Counting number of occurrences in column?

Just adding some extra sorting if needed

=QUERY(A2:A,"select A, count(A) where A is not null group by A order by count(A) DESC label A 'Name', count(A) 'Count'",-1)

enter image description here

High-precision clock in Python

time.clock() has 13 decimal points on Windows but only two on Linux. time.time() has 17 decimals on Linux and 16 on Windows but the actual precision is different.

I don't agree with the documentation that time.clock() should be used for benchmarking on Unix/Linux. It is not precise enough, so what timer to use depends on operating system.

On Linux, the time resolution is high in time.time():

>>> time.time(), time.time()
(1281384913.4374139, 1281384913.4374161)

On Windows, however the time function seems to use the last called number:

>>> time.time()-int(time.time()), time.time()-int(time.time()), time.time()-time.time()
(0.9570000171661377, 0.9570000171661377, 0.0)

Even if I write the calls on different lines in Windows it still returns the same value so the real precision is lower.

So in serious measurements a platform check (import platform, platform.system()) has to be done in order to determine whether to use time.clock() or time.time().

(Tested on Windows 7 and Ubuntu 9.10 with python 2.6 and 3.1)

Facebook how to check if user has liked page and show content?

There is an article here that describes your problem

http://www.hyperarts.com/blog/facebook-fan-pages-content-for-fans-only-static-fbml/

    <fb:visible-to-connection>
       Fans will see this content.
       <fb:else>
           Non-fans will see this content.
       </fb:else>
    </fb:visible-to-connection>

Add Custom Headers using HttpWebRequest

A simple method of creating the service, adding headers and reading the JSON response,

private static void WebRequest()
{
    const string WEBSERVICE_URL = "<<Web Service URL>>";
    try
    {
        var webRequest = System.Net.WebRequest.Create(WEBSERVICE_URL);
        if (webRequest != null)
        {
            webRequest.Method = "GET";
            webRequest.Timeout = 20000;
            webRequest.ContentType = "application/json";
            webRequest.Headers.Add("Authorization", "Basic dcmGV25hZFzc3VudDM6cGzdCdvQ=");
            using (System.IO.Stream s = webRequest.GetResponse().GetResponseStream())
            {
                using (System.IO.StreamReader sr = new System.IO.StreamReader(s))
                {
                    var jsonResponse = sr.ReadToEnd();
                    Console.WriteLine(String.Format("Response: {0}", jsonResponse));
                }
            }
        }
    }
    catch (Exception ex)
    {
        Console.WriteLine(ex.ToString());
    }
}

Correct way to write line to file?

I do not think there is a "correct" way.

I would use:

with open ('myfile', 'a') as f: f.write ('hi there\n')

In memoriam Tim Toady.

HTML 5 Favicon - Support?

The answers provided (at the time of this post) are link only answers so I thought I would summarize the links into an answer and what I will be using.

When working to create Cross Browser Favicons (including touch icons) there are several things to consider.

The first (of course) is Internet Explorer. IE does not support PNG favicons until version 11. So our first line is a conditional comment for favicons in IE 9 and below:

<!--[if IE]><link rel="shortcut icon" href="path/to/favicon.ico"><![endif]-->

To cover the uses of the icon create it at 32x32 pixels. Notice the rel="shortcut icon" for IE to recognize the icon it needs the word shortcut which is not standard. Also we wrap the .ico favicon in a IE conditional comment because Chrome and Safari will use the .ico file if it is present, despite other options available, not what we would like.

The above covers IE up to IE 9. IE 11 accepts PNG favicons, however, IE 10 does not. Also IE 10 does not read conditional comments thus IE 10 won't show a favicon. With IE 11 and Edge available I don't see IE 10 in widespread use, so I ignore this browser.

For the rest of the browsers we are going to use the standard way to cite a favicon:

<link rel="icon" href="path/to/favicon.png">

This icon should be 196x196 pixels in size to cover all devices that may use this icon.

To cover touch icons on mobile devices we are going to use Apple's proprietary way to cite a touch icon:

<link rel="apple-touch-icon-precomposed" href="apple-touch-icon-precomposed.png">

Using rel="apple-touch-icon-precomposed" will not apply the reflective shine when bookmarked on iOS. To have iOS apply the shine use rel="apple-touch-icon". This icon should be sized to 180x180 pixels as that is the current size recommend by Apple for the latest iPhones and iPads. I have read Blackberry will also use rel="apple-touch-icon-precomposed".

As a note: Chrome for Android states:

The apple-touch-* are deprecated, and will be supported only for a short time. (Written as of beta for m31 of Chrome).

Custom Tiles for IE 11+ on Windows 8.1+

IE 11+ on Windows 8.1+ does offer a way to create pinned tiles for your site.

Microsoft recommends creating a few tiles at the following size:

Small: 128 x 128

Medium: 270 x 270

Wide: 558 x 270

Large: 558 x 558

These should be transparent images as we will define a color background next.

Once these images are created you should create an xml file called browserconfig.xml with the following code:

<?xml version="1.0" encoding="utf-8"?>
<browserconfig>
  <msapplication>
    <tile>
      <square70x70logo src="images/smalltile.png"/>
      <square150x150logo src="images/mediumtile.png"/>
      <wide310x150logo src="images/widetile.png"/>
      <square310x310logo src="images/largetile.png"/>
      <TileColor>#009900</TileColor>
    </tile>
  </msapplication>
</browserconfig>

Save this xml file in the root of your site. When a site is pinned IE will look for this file. If you want to name the xml file something different or have it in a different location add this meta tag to the head:

<meta name="msapplication-config" content="path-to-browserconfig/custom-name.xml" />

For additional information on IE 11+ custom tiles and using the XML file visit Microsoft's website.

Putting it all together:

To put it all together the above code would look like this:

<!-- For IE 9 and below. ICO should be 32x32 pixels in size -->
<!--[if IE]><link rel="shortcut icon" href="path/to/favicon.ico"><![endif]-->

<!-- Touch Icons - iOS and Android 2.1+ 180x180 pixels in size. --> 
<link rel="apple-touch-icon-precomposed" href="apple-touch-icon-precomposed.png">

<!-- Firefox, Chrome, Safari, IE 11+ and Opera. 196x196 pixels in size. -->
<link rel="icon" href="path/to/favicon.png">

Windows Phone Live Tiles

If a user is using a Windows Phone they can pin a website to the start screen of their phone. Unfortunately, when they do this it displays a screenshot of your phone, not a favicon (not even the MS specific code referenced above). To make a "Live Tile" for Windows Phone Users for your website one must use the following code:

Here are detailed instructions from Microsoft but here is a synopsis:

Step 1

Create a square image for your website, to support hi-res screens create it at 768x768 pixels in size.

Step 2

Add a hidden overlay of this image. Here is example code from Microsoft:

<div id="TileOverlay" onclick="ToggleTileOverlay()" style='background-color: Highlight; height: 100%; width: 100%; top: 0px; left: 0px; position: fixed; color: black; visibility: hidden'>
  <img src="customtile.png" width="320" height="320" />
  <div style='margin-top: 40px'>
     Add text/graphic asking user to pin to start using the menu...
  </div>
</div>

Step 3

You then can add thew following line to add a pin to start link:

<a href="javascript:ToggleTileOverlay()">Pin this site to your start screen</a>

Microsoft recommends that you detect windows phone and only show that link to those users since it won't work for other users.

Step 4

Next you add some JS to toggle the overlay visibility

<script>
function ToggleTileOverlay() {
 var newVisibility =     (document.getElementById('TileOverlay').style.visibility == 'visible') ? 'hidden' : 'visible';
 document.getElementById('TileOverlay').style.visibility =    newVisibility;
}
</script>

Note on Sizes

I am using one size as every browser will scale down the image as necessary. I could add more HTML to specify multiple sizes if desired for those with a lower bandwidth but I am already compressing the PNG files heavily using TinyPNG and I find this unnecessary for my purposes. Also, according to philippe_b's answer Chrome and Firefox have bugs that cause the browser to load all sizes of icons. Using one large icon may be better than multiple smaller ones because of this.

Further Reading

For those who would like more details see the links below:

How do I fix a "Expected Primary-expression before ')' token" error?

showInventory(player); is passing a type as parameter. That's illegal, you need to pass an object.

For example, something like:

player p;
showInventory(p);  

I'm guessing you have something like this:

int main()
{
   player player;
   toDo();
}

which is awful. First, don't name the object the same as your type. Second, in order for the object to be visible inside the function, you'll need to pass it as parameter:

int main()
{
   player p;
   toDo(p);
}

and

std::string toDo(player& p) 
{
    //....
    showInventory(p);
    //....
}

Is there a way to programmatically minimize a window

FormName.WindowState = FormWindowState.Minimized;

How to remove border from specific PrimeFaces p:panelGrid?

If BalusC answer doesn't work try this:

.companyHeaderGrid td {
     border-style: hidden !important;
}

Does IE9 support console.log, and is it a real function?

In Internet Explorer 9 (and 8), the console object is only exposed when the developer tools are opened for a particular tab. If you hide the developer tools window for that tab, the console object remains exposed for each page you navigate to. If you open a new tab, you must also open the developer tools for that tab in order for the console object to be exposed.

The console object is not part of any standard and is an extension to the Document Object Model. Like other DOM objects, it is considered a host object and is not required to inherit from Object, nor its methods from Function, like native ECMAScript functions and objects do. This is the reason apply and call are undefined on those methods. In IE 9, most DOM objects were improved to inherit from native ECMAScript types. As the developer tools are considered an extension to IE (albeit, a built-in extension), they clearly didn't receive the same improvements as the rest of the DOM.

For what it's worth, you can still use some Function.prototype methods on console methods with a little bind() magic:

var log = Function.prototype.bind.call(console.log, console);
log.apply(console, ["this", "is", "a", "test"]);
//-> "thisisatest"

Init method in Spring Controller (annotation version)

public class InitHelloWorld implements BeanPostProcessor {

   public Object postProcessBeforeInitialization(Object bean,
             String beanName) throws BeansException {
       System.out.println("BeforeInitialization : " + beanName);
       return bean;  // you can return any other object as well
   }

   public Object postProcessAfterInitialization(Object bean,
             String beanName) throws BeansException {
       System.out.println("AfterInitialization : " + beanName);
       return bean;  // you can return any other object as well
   }

}

Combine two arrays

This works:

$output = $array1 + $array2;

Android ImageView's onClickListener does not work

Same Silly thing happed with me.

I just copied one activity and pasted. Defined in Manifest.

Open from MainActivity.java but I was forgot that Copied Activity is getting some params in bundle and If I don't pass any params, just finished.

So My Activity is getting started but finished at same moment.

I had written Toast and found this silly mistake. :P

JSP : JSTL's <c:out> tag

c:out escapes HTML characters so that you can avoid cross-site scripting.

if person.name = <script>alert("Yo")</script>

the script will be executed in the second case, but not when using c:out

How can I loop through a List<T> and grab each item?

The low level iterator manipulate code:

List<Money> myMoney = new List<Money>
{
    new Money{amount = 10, type = "US"},
    new Money{amount = 20, type = "US"}
};
using (var enumerator = myMoney.GetEnumerator())
{
    while (enumerator.MoveNext())
    {
        var element = enumerator.Current;
        Console.WriteLine(element.amount);
    }
}

Adding new files to a subversion repository

Normally svn add * works. But if you get message like svn: warning: W150002: due to mix off versioned and non-versioned files in working copy. Use this command:

svn add <path to directory> --force

or

svn add * --force

Gridview with two columns and auto resized images

another simple approach with modern built-in stuff like PercentRelativeLayout is now available for new users who hit this problem. thanks to android team for release this item.

<android.support.percent.PercentRelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clickable="true"
app:layout_widthPercent="50%">

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:id="@+id/picture"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scaleType="centerCrop" />

    <TextView
        android:id="@+id/text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        android:background="#55000000"
        android:paddingBottom="15dp"
        android:paddingLeft="10dp"
        android:paddingRight="10dp"
        android:paddingTop="15dp"
        android:textColor="@android:color/white" />

</FrameLayout>

and for better performance you can use some stuff like picasso image loader which help you to fill whole width of every image parents. for example in your adapter you should use this:

int width= context.getResources().getDisplayMetrics().widthPixels;
    com.squareup.picasso.Picasso
            .with(context)
            .load("some url")
            .centerCrop().resize(width/2,width/2)
            .error(R.drawable.placeholder)
            .placeholder(R.drawable.placeholder)
            .into(item.drawableId);

now you dont need CustomImageView Class anymore.

P.S i recommend to use ImageView in place of Type Int in class Item.

hope this help..

7-Zip command to create and extract a password-protected ZIP file on Windows?

To fully script-automate:

Create:

7z -mhc=on -mhe=on -pPasswordHere a %ZipDest% %WhatYouWantToZip%

Unzip:

7z x %ZipFile% -pPasswordHere

(Depending, you might need to: Set Path=C:\Program Files\7-Zip;%Path% )

MySQL/SQL: Group by date only on a Datetime column

Cast the datetime to a date, then GROUP BY using this syntax:

SELECT SUM(foo), DATE(mydate) FROM a_table GROUP BY DATE(a_table.mydate);

Or you can GROUP BY the alias as @orlandu63 suggested:

SELECT SUM(foo), DATE(mydate) DateOnly FROM a_table GROUP BY DateOnly;

Though I don't think it'll make any difference to performance, it is a little clearer.

Creating a PHP header/footer

Just create the header.php file, and where you want to use it do:

<?php
include('header.php');
?>

Same with the footer. You don't need php tags in these files if you just have html.

See more about include here:

http://php.net/manual/en/function.include.php

Removing App ID from Developer Connection

App IDs cannot be removed because once allocated they need to stay alive so that another App ID doesn't accidentally collide with a previously existing App ID.

Apple should however support hiding unwanted App IDs (instead of completely deleting them) to reduce clutter.

How to switch text case in visual studio code

To have in Visual Studio Code what you can do in Sublime Text ( CTRL+K CTRL+U and CTRL+K CTRL+L ) you could do this:

  • Open "Keyboard Shortcuts" with click on "File -> Preferences -> Keyboard Shortcuts"
  • Click on "keybindings.json" link which appears under "Search keybindings" field
  • Between the [] brackets add:

    {
        "key": "ctrl+k ctrl+u",
        "command": "editor.action.transformToUppercase",
        "when": "editorTextFocus"
    },
    {
        "key": "ctrl+k ctrl+l",
        "command": "editor.action.transformToLowercase",
        "when": "editorTextFocus"
    }
    
  • Save and close "keybindings.json"


Another way:
Microsoft released "Sublime Text Keymap and Settings Importer", an extension which imports keybindings and settings from Sublime Text to VS Code. - https://marketplace.visualstudio.com/items?itemName=ms-vscode.sublime-keybindings

The 'packages' element is not declared

You can also find a copy of the nuspec.xsd here as it seems to no longer be available:

https://gist.github.com/sharwell/6131243

SQL Server format decimal places with commas

SQL (or to be more precise, the RDBMS) is not meant to be the right choice for formatting the output. The database should deliver raw data which then should be formatted (or more general: processed) in the destination application.

However, depending on the specific system you use, you may write a UDF (user defined function) to achive what you want. But please bear in mind that you then are in fact returning a varchar, which you will not be able to further process (e.g. summarize).

javascript code to check special characters

If you don't want to include any special character, then try this much simple way for checking special characters using RegExp \W Metacharacter.

var iChars = "~`!#$%^&*+=-[]\\\';,/{}|\":<>?";
if(!(iChars.match(/\W/g)) == "") {
    alert ("File name has special characters ~`!#$%^&*+=-[]\\\';,/{}|\":<>? \nThese are not allowed\n");
    return false;
}

PHP cURL not working - WAMP on Windows 7 64 bit

Ensure that your system PATH environment variable contains the directory in which PHP is installed. Stop the Apache server and restart it once more. With luck CURL will start working.

Adding text to a cell in Excel using VBA

You can also use the cell property.

Cells(1, 1).Value = "Hey, what's up?"

Make sure to use a . before Cells(1,1).Value as in .Cells(1,1).Value, if you are using it within With function. If you are selecting some sheet.

m2eclipse not finding maven dependencies, artifacts not found

It sounds like your m2eclipse install is using the embedded Maven, which has its own repository (located under user home) and settings.

If you open up the Maven preferences (Window->Preferences->Maven->Installations, you can add your Maven installation by selecting Add... then browsing to the M2_HOME directory.

Preferences screenshot
(source: sonatype.com)

For more details see the m2eclipse book

Fatal Error: Allowed Memory Size of 134217728 Bytes Exhausted (CodeIgniter + XML-RPC)

After enabling these two lines, it started working:

; Determines the size of the realpath cache to be used by PHP. This value should
; be increased on systems where PHP opens many files to reflect the quantity of
; the file operations performed.
; http://php.net/realpath-cache-size
realpath_cache_size = 16k

; Duration of time, in seconds for which to cache realpath information for a given
; file or directory. For systems with rarely changing files, consider increasing this
; value.
; http://php.net/realpath-cache-ttl
realpath_cache_ttl = 120

StringIO in Python3

I hope this will meet your requirement

import PyPDF4
import io

pdfFile = open(r'test.pdf', 'rb')
pdfReader = PyPDF4.PdfFileReader(pdfFile)
pageObj = pdfReader.getPage(1)
pagetext = pageObj.extractText()

for line in io.StringIO(pagetext):
    print(line)

How to configure slf4j-simple

This is a sample simplelogger.properties which you can place on the classpath (uncomment the properties you wish to use):

# SLF4J's SimpleLogger configuration file
# Simple implementation of Logger that sends all enabled log messages, for all defined loggers, to System.err.

# Default logging detail level for all instances of SimpleLogger.
# Must be one of ("trace", "debug", "info", "warn", or "error").
# If not specified, defaults to "info".
#org.slf4j.simpleLogger.defaultLogLevel=info

# Logging detail level for a SimpleLogger instance named "xxxxx".
# Must be one of ("trace", "debug", "info", "warn", or "error").
# If not specified, the default logging detail level is used.
#org.slf4j.simpleLogger.log.xxxxx=

# Set to true if you want the current date and time to be included in output messages.
# Default is false, and will output the number of milliseconds elapsed since startup.
#org.slf4j.simpleLogger.showDateTime=false

# The date and time format to be used in the output messages.
# The pattern describing the date and time format is the same that is used in java.text.SimpleDateFormat.
# If the format is not specified or is invalid, the default format is used.
# The default format is yyyy-MM-dd HH:mm:ss:SSS Z.
#org.slf4j.simpleLogger.dateTimeFormat=yyyy-MM-dd HH:mm:ss:SSS Z

# Set to true if you want to output the current thread name.
# Defaults to true.
#org.slf4j.simpleLogger.showThreadName=true

# Set to true if you want the Logger instance name to be included in output messages.
# Defaults to true.
#org.slf4j.simpleLogger.showLogName=true

# Set to true if you want the last component of the name to be included in output messages.
# Defaults to false.
#org.slf4j.simpleLogger.showShortLogName=false

Assign JavaScript variable to Java Variable in JSP

Java script plays on browser where java code is server side thing so you can't simply do this.

What you can do is submit the calculated variable from javascript to server by form-submission, or using URL parameter or using AJAX calls and then you can make it available on server

HTML

<input type="hidden" id="hiddenField"/>

make sure this fields lays under <form>

Javascript

document.getElementById("hiddenField").value=yourCalculatedVariable;

on server you would get this as a part of request

Insert line after first match using sed

Sed command that works on MacOS (at least, OS 10) and Unix alike (ie. doesn't require gnu sed like Gilles' (currently accepted) one does):

sed -e '/CLIENTSCRIPT="foo"/a\'$'\n''CLIENTSCRIPT2="hello"' file

This works in bash and maybe other shells too that know the $'\n' evaluation quote style. Everything can be on one line and work in older/POSIX sed commands. If there might be multiple lines matching the CLIENTSCRIPT="foo" (or your equivalent) and you wish to only add the extra line the first time, you can rework it as follows:

sed -e '/^ *CLIENTSCRIPT="foo"/b ins' -e b -e ':ins' -e 'a\'$'\n''CLIENTSCRIPT2="hello"' -e ': done' -e 'n;b done' file

(this creates a loop after the line insertion code that just cycles through the rest of the file, never getting back to the first sed command again).

You might notice I added a '^ *' to the matching pattern in case that line shows up in a comment, say, or is indented. Its not 100% perfect but covers some other situations likely to be common. Adjust as required...

These two solutions also get round the problem (for the generic solution to adding a line) that if your new inserted line contains unescaped backslashes or ampersands they will be interpreted by sed and likely not come out the same, just like the \n is - eg. \0 would be the first line matched. Especially handy if you're adding a line that comes from a variable where you'd otherwise have to escape everything first using ${var//} before, or another sed statement etc.

This solution is a little less messy in scripts (that quoting and \n is not easy to read though), when you don't want to put the replacement text for the a command at the start of a line if say, in a function with indented lines. I've taken advantage that $'\n' is evaluated to a newline by the shell, its not in regular '\n' single-quoted values.

Its getting long enough though that I think perl/even awk might win due to being more readable.

Can I set the height of a div based on a percentage-based width?

I made a CSS approach to this that is sized by the viewport width, but maxes out at 100% of the viewport height. It doesn't require box-sizing:border-box. If a pseudo element cannot be used, the pseudo-code's CSS can be applied to a child. Demo

.container {
  position: relative;
  max-width:100vh;
  max-height:100%;
  margin:0 auto;
  overflow: hidden;
}
.container:before {
  content: "";
  display: block;
  margin-top: 100%;
}
.child {
  position: absolute;
  top: 0;
  left: 0;
}

Support table for viewport units

I wrote about this approach and others in a CSS-Tricks article on scaling responsive animations that you should check out.

Calculating distance between two geographic locations

distanceTo will give you the distance in meters between the two given location ej target.distanceTo(destination).

distanceBetween give you the distance also but it will store the distance in a array of float( results[0]). the doc says If results has length 2 or greater, the initial bearing is stored in results[1]. If results has length 3 or greater, the final bearing is stored in results[2]

hope that this helps

i've used distanceTo to get the distance from point A to B i think that is the way to go.

C free(): invalid pointer

You're attempting to free something that isn't a pointer to a "freeable" memory address. Just because something is an address doesn't mean that you need to or should free it.

There are two main types of memory you seem to be confusing - stack memory and heap memory.

  • Stack memory lives in the live span of the function. It's temporary space for things that shouldn't grow too big. When you call the function main, it sets aside some memory for your variables you've declared (p,token, and so on).

  • Heap memory lives from when you malloc it to when you free it. You can use much more heap memory than you can stack memory. You also need to keep track of it - it's not easy like stack memory!

You have a few errors:

  • You're trying to free memory that's not heap memory. Don't do that.

  • You're trying to free the inside of a block of memory. When you have in fact allocated a block of memory, you can only free it from the pointer returned by malloc. That is to say, only from the beginning of the block. You can't free a portion of the block from the inside.

For your bit of code here, you probably want to find a way to copy relevant portion of memory to somewhere else...say another block of memory you've set aside. Or you can modify the original string if you want (hint: char value 0 is the null terminator and tells functions like printf to stop reading the string).

EDIT: The malloc function does allocate heap memory*.

"9.9.1 The malloc and free Functions

The C standard library provides an explicit allocator known as the malloc package. Programs allocate blocks from the heap by calling the malloc function."

~Computer Systems : A Programmer's Perspective, 2nd Edition, Bryant & O'Hallaron, 2011

EDIT 2: * The C standard does not, in fact, specify anything about the heap or the stack. However, for anyone learning on a relevant desktop/laptop machine, the distinction is probably unnecessary and confusing if anything, especially if you're learning about how your program is stored and executed. When you find yourself working on something like an AVR microcontroller as H2CO3 has, it is definitely worthwhile to note all the differences, which from my own experience with embedded systems, extend well past memory allocation.

T-SQL How to select only Second row from a table?

you can use OFFSET and FETCH NEXT

SELECT id
FROM tablename
ORDER BY column
OFFSET 1 ROWS
FETCH NEXT 1 ROWS ONLY;

NOTE:

OFFSET can only be used with ORDER BY clause. It cannot be used on its own.

OFFSET value must be greater than or equal to zero. It cannot be negative, else return error.

The OFFSET argument is used to identify the starting point to return rows from a result set. Basically, it exclude the first set of records.

The FETCH argument is used to return a set of number of rows. FETCH can’t be used itself, it is used in conjuction with OFFSET.

JQuery Redirect to URL after specified time

You can use

    $(document).ready(function(){
      setTimeout(function() {
       window.location.href = "http://test.example.com/;"
      }, 5000);
    });

How to change permissions for a folder and its subfolders/files in one step?

Use:

sudo chmod 755 -R /whatever/your/directory/is

However, be careful with that. It can really hurt you if you change the permissions of the wrong files/folders.

Import SQL dump into PostgreSQL database

If you are using a file with .dump extension use:

pg_restore -h hostname -d dbname -U username filename.dump

How do I check out a specific version of a submodule using 'git submodule'?

Submodule repositories stay in a detached HEAD state pointing to a specific commit. Changing that commit simply involves checking out a different tag or commit then adding the change to the parent repository.

$ cd submodule
$ git checkout v2.0
Previous HEAD position was 5c1277e... bumped version to 2.0.5
HEAD is now at f0a0036... version 2.0

git-status on the parent repository will now report a dirty tree:

# On branch dev [...]
#
#   modified:   submodule (new commits)

Add the submodule directory and commit to store the new pointer.

Random integer in VB.NET

As has been pointed out many times, the suggestion to write code like this is problematic:

Public Function GetRandom(ByVal Min As Integer, ByVal Max As Integer) As Integer
    Dim Generator As System.Random = New System.Random()
    Return Generator.Next(Min, Max)
End Function

The reason is that the constructor for the Random class provides a default seed based on the system's clock. On most systems, this has limited granularity -- somewhere in the vicinity of 20 ms. So if you write the following code, you're going to get the same number a bunch of times in a row:

Dim randoms(1000) As Integer
For i As Integer = 0 to randoms.Length - 1
    randoms(i) = GetRandom(1, 100)
Next

The following code addresses this issue:

Public Function GetRandom(ByVal Min As Integer, ByVal Max As Integer) As Integer
    ' by making Generator static, we preserve the same instance '
    ' (i.e., do not create new instances with the same seed over and over) '
    ' between calls '
    Static Generator As System.Random = New System.Random()
    Return Generator.Next(Min, Max)
End Function

I threw together a simple program using both methods to generate 25 random integers between 1 and 100. Here's the output:

Non-static: 70 Static: 70
Non-static: 70 Static: 46
Non-static: 70 Static: 58
Non-static: 70 Static: 19
Non-static: 70 Static: 79
Non-static: 70 Static: 24
Non-static: 70 Static: 14
Non-static: 70 Static: 46
Non-static: 70 Static: 82
Non-static: 70 Static: 31
Non-static: 70 Static: 25
Non-static: 70 Static: 8
Non-static: 70 Static: 76
Non-static: 70 Static: 74
Non-static: 70 Static: 84
Non-static: 70 Static: 39
Non-static: 70 Static: 30
Non-static: 70 Static: 55
Non-static: 70 Static: 49
Non-static: 70 Static: 21
Non-static: 70 Static: 99
Non-static: 70 Static: 15
Non-static: 70 Static: 83
Non-static: 70 Static: 26
Non-static: 70 Static: 16
Non-static: 70 Static: 75

Windows Batch: How to add Host-Entries?

Here is my modification of @rashy above. The script does the following:

  • it verifies you have access, if not, requests it
  • allows you to enter in multiple hosts in a list
  • loops through the list
  • It finds the line containing the the domain name and removes it, then re-adds it (incase the ip has changed since the last time the script was run).
  • if the domain isn't there, it just adds it.

This is the script:

@echo off
TITLE Modifying your HOSTS file
COLOR F0
ECHO.


:: BatchGotAdmin
:-------------------------------------
REM  --> Check for permissions
>nul 2>&1 "%SYSTEMROOT%\system32\cacls.exe" "%SYSTEMROOT%\system32\config\system"

REM --> If error flag set, we do not have admin.
if '%errorlevel%' NEQ '0' (
    echo Requesting administrative privileges...
    goto UACPrompt
) else ( goto gotAdmin )

:UACPrompt
    echo Set UAC = CreateObject^("Shell.Application"^) > "%temp%\getadmin.vbs"
    set params = %*:"="
    echo UAC.ShellExecute "cmd.exe", "/c %~s0 %params%", "", "runas", 1 >> "%temp%\getadmin.vbs"

    "%temp%\getadmin.vbs"
    del "%temp%\getadmin.vbs"
    exit /B

:gotAdmin
    pushd "%CD%"
    CD /D "%~dp0"
:--------------------------------------

:LOOP
SET Choice=
SET /P Choice="Do you want to modify HOSTS file ? (Y/N)"

IF NOT '%Choice%'=='' SET Choice=%Choice:~0,1%

ECHO.
IF /I '%Choice%'=='Y' GOTO ACCEPTED
IF /I '%Choice%'=='N' GOTO REJECTED
ECHO Please type Y (for Yes) or N (for No) to proceed!
ECHO.
GOTO Loop


:REJECTED
ECHO Your HOSTS file was left unchanged>>%systemroot%\Temp\hostFileUpdate.log
ECHO Finished.
GOTO END


:ACCEPTED
setlocal enabledelayedexpansion
::Create your list of host domains
set LIST=(diqc.oca wiki.oca)
::Set the ip of the domains you set in the list above
set diqc.oca=192.168.111.6
set wiki.oca=192.168.111.4
:: deletes the parentheses from LIST
set _list=%LIST:~1,-1%
::ECHO %WINDIR%\System32\drivers\etc\hosts > tmp.txt
for  %%G in (%_list%) do (
    set  _name=%%G
    set  _value=!%%G!
    SET NEWLINE=^& echo.
    ECHO Carrying out requested modifications to your HOSTS file
    ::strip out this specific line and store in tmp file
    type %WINDIR%\System32\drivers\etc\hosts | findstr /v !_name! > tmp.txt
    ::re-add the line to it
    ECHO %NEWLINE%^!_value! !_name!>>tmp.txt
    ::overwrite host file
    copy /b/v/y tmp.txt %WINDIR%\System32\drivers\etc\hosts
    del tmp.txt
)
ipconfig /flushdns
ECHO.
ECHO.
ECHO Finished, you may close this window now.
ECHO You should now open Chrome and go to "chrome://net-internals/#dns" (without quotes)
ECHO     then click the "clear host cache" button
GOTO END

:END
ECHO.
ping -n 11 192.0.2.2 > nul
EXIT

Python: Convert timedelta to int in a dataframe

The simplest way to do this is by

df["DateColumn"] = (df["DateColumn"]).dt.days

Get current date, given a timezone in PHP?

If you have access to PHP 5.3, the intl extension is very nice for doing things like this.

Here's an example from the manual:

$fmt = new IntlDateFormatter( "en_US" ,IntlDateFormatter::FULL, IntlDateFormatter::FULL,
    'America/Los_Angeles',IntlDateFormatter::GREGORIAN  );
$fmt->format(0); //0 for current time/date

In your case, you can do:

$fmt = new IntlDateFormatter( "en_US" ,IntlDateFormatter::FULL, IntlDateFormatter::FULL,
        'America/New_York');
 $fmt->format($datetime); //where $datetime may be a DateTime object, an integer representing a Unix timestamp value (seconds since epoch, UTC) or an array in the format output by localtime(). 

As you can set a Timezone such as America/New_York, this is much better than using a GMT or UTC offset, as this takes into account the day light savings periods as well.

Finaly, as the intl extension uses ICU data, which contains a lot of very useful features when it comes to creating your own date/time formats.

How does a PreparedStatement avoid or prevent SQL injection?

The SQL used in a PreparedStatement is precompiled on the driver. From that point on, the parameters are sent to the driver as literal values and not executable portions of SQL; thus no SQL can be injected using a parameter. Another beneficial side effect of PreparedStatements (precompilation + sending only parameters) is improved performance when running the statement multiple times even with different values for the parameters (assuming that the driver supports PreparedStatements) as the driver does not have to perform SQL parsing and compilation each time the parameters change.

Cannot create SSPI context

In my case it was a missing SPN, had to run these two commands:

setspn -a MSSQLSvc:SERVERNAME SERVERNAME setspn -a MSSQLSvc:SERVERNAME:1433 SERVERNAME

In other words in my case I had the FQDN in there already correctly but not just the NETBIOS name, after adding these it worked fine. Well initially it didn't but after waiting 2 minutes it did.

Auto detect mobile browser (via user-agent?)

Have you considered using css3 media queries? In most cases you can apply some css styles specifically for the targeted device without having to create a separate mobile version of the site.

@media screen and (max-width:1025px) {
   #content {
     width: 100%;
   }
}

You can set the width to whatever you want, but 1025 will catch the iPad landscape view.

You'll also want to add the following meta tag to your head:

<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">

Check out this article over at HTML5 Rocks for some good examples

How to set a Header field on POST a form?

From FormData documention:

XMLHttpRequest Level 2 adds support for the new FormData interface. FormData objects provide a way to easily construct a set of key/value pairs representing form fields and their values, which can then be easily sent using the XMLHttpRequest send() method.

With an XMLHttpRequest you can set the custom headers and then do the POST.

Update rows in one table with data from another table based on one column in each being equal

You Could always use and leave out the "when not matched section"

merge into table1 FromTable   
   using table2 ToTable
     on     ( FromTable.field1 = ToTable.field1
          and  FromTable.field2 =ToTable.field2)
when Matched then
update set 
  ToTable.fieldr = FromTable.fieldx,
  ToTable.fields = FromTable.fieldy, 
  ToTable.fieldt =  FromTable.fieldz)
when not matched then
  insert  (ToTable.field1,
       ToTable.field2,
       ToTable.fieldr,
       ToTable.fields,
       ToTable.fieldt)
  values (FromTable.field1,
         FromTable.field2,
         FromTable.fieldx,
         FromTable.fieldy,
         FromTable.fieldz);

How can I emulate a get request exactly like a web browser?

Are you sure the curl module honors ini_set('user_agent',...)? There is an option CURLOPT_USERAGENT described at http://docs.php.net/function.curl-setopt.
Could there also be a cookie tested by the server? That you can handle by using CURLOPT_COOKIE, CURLOPT_COOKIEFILE and/or CURLOPT_COOKIEJAR.

edit: Since the request uses https there might also be error in verifying the certificate, see CURLOPT_SSL_VERIFYPEER.

$url="https://new.aol.com/productsweb/subflows/ScreenNameFlow/AjaxSNAction.do?s=username&f=firstname&l=lastname";
$agent= 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.0.3705; .NET CLR 1.1.4322)';

$ch = curl_init();
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_VERBOSE, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_USERAGENT, $agent);
curl_setopt($ch, CURLOPT_URL,$url);
$result=curl_exec($ch);
var_dump($result);

Adding ID's to google map markers

JavaScript is a dynamic language. You could just add it to the object itself.

var marker = new google.maps.Marker(markerOptions);
marker.metadata = {type: "point", id: 1};

Also, because all v3 objects extend MVCObject(). You can use:

marker.setValues({type: "point", id: 1});
// or
marker.set("type", "point");
marker.set("id", 1);
var val = marker.get("id");

Angular - res.json() is not a function

Don't need to use this method:

 .map((res: Response) => res.json() );

Just use this simple method instead of the previous method. hopefully you'll get your result:

.map(res => res );

Making WPF applications look Metro-styled, even in Windows 7? (Window Chrome / Theming / Theme)

What I did was creating my own Window and Style. Because I like to have control over everything and I didn't want some external libraries just to use a Window from it. I looked at already mentioned MahApps.Metro on GitHub

MahApps

and also very nice Modern UI on GitHub. (.NET4.5 only)

Modern UI

There is one more it's Elysium but I really didn't try this one.

Elysium

The style I did was really easy when I looked how it's done in these. Now I have my own Window and I can do whatever I want with xaml... for me it's the main reason why I did my own. And I made one more for you too :) I should probably say that I wouldn't be able to do it without exploring Modern UI it was great help. I tried to make it look like VS2012 Window. It looks like this.

MyWindow

Here is code (please note that it's targeting .NET4.5)

public class MyWindow : Window
{

    public MyWindow()
    {
        this.CommandBindings.Add(new CommandBinding(SystemCommands.CloseWindowCommand, this.OnCloseWindow));
        this.CommandBindings.Add(new CommandBinding(SystemCommands.MaximizeWindowCommand, this.OnMaximizeWindow, this.OnCanResizeWindow));
        this.CommandBindings.Add(new CommandBinding(SystemCommands.MinimizeWindowCommand, this.OnMinimizeWindow, this.OnCanMinimizeWindow));
        this.CommandBindings.Add(new CommandBinding(SystemCommands.RestoreWindowCommand, this.OnRestoreWindow, this.OnCanResizeWindow));
    }

    private void OnCanResizeWindow(object sender, CanExecuteRoutedEventArgs e)
    {
        e.CanExecute = this.ResizeMode == ResizeMode.CanResize || this.ResizeMode == ResizeMode.CanResizeWithGrip;
    }

    private void OnCanMinimizeWindow(object sender, CanExecuteRoutedEventArgs e)
    {
        e.CanExecute = this.ResizeMode != ResizeMode.NoResize;
    }

    private void OnCloseWindow(object target, ExecutedRoutedEventArgs e)
    {
        SystemCommands.CloseWindow(this);
    }

    private void OnMaximizeWindow(object target, ExecutedRoutedEventArgs e)
    {
        SystemCommands.MaximizeWindow(this);
    }

    private void OnMinimizeWindow(object target, ExecutedRoutedEventArgs e)
    {
        SystemCommands.MinimizeWindow(this);
    }

    private void OnRestoreWindow(object target, ExecutedRoutedEventArgs e)
    {
        SystemCommands.RestoreWindow(this);
    }
}

And here resources:

<BooleanToVisibilityConverter x:Key="bool2VisibilityConverter" />

<Color x:Key="WindowBackgroundColor">#FF2D2D30</Color>
<Color x:Key="HighlightColor">#FF3F3F41</Color>
<Color x:Key="BlueColor">#FF007ACC</Color>
<Color x:Key="ForegroundColor">#FFF4F4F5</Color>

<SolidColorBrush x:Key="WindowBackgroundColorBrush" Color="{StaticResource WindowBackgroundColor}"/>
<SolidColorBrush x:Key="HighlightColorBrush" Color="{StaticResource HighlightColor}"/>
<SolidColorBrush x:Key="BlueColorBrush" Color="{StaticResource BlueColor}"/>
<SolidColorBrush x:Key="ForegroundColorBrush" Color="{StaticResource ForegroundColor}"/>

<Style x:Key="WindowButtonStyle" TargetType="{x:Type Button}">
    <Setter Property="Foreground" Value="{DynamicResource ForegroundColorBrush}" />
    <Setter Property="Background" Value="Transparent" />
    <Setter Property="HorizontalContentAlignment" Value="Center" />
    <Setter Property="VerticalContentAlignment" Value="Center" />
    <Setter Property="Padding" Value="1" />
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type Button}">
                <Grid Background="{TemplateBinding Background}">
                    <ContentPresenter x:Name="contentPresenter"
                          HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                          VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
                          SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"
                          Margin="{TemplateBinding Padding}"
                          RecognizesAccessKey="True" />
                </Grid>
                <ControlTemplate.Triggers>
                    <Trigger Property="IsMouseOver" Value="True">
                        <Setter Property="Background" Value="{StaticResource HighlightColorBrush}" />
                    </Trigger>
                    <Trigger Property="IsPressed" Value="True">
                        <Setter Property="Background" Value="{DynamicResource BlueColorBrush}" />
                    </Trigger>
                    <Trigger Property="IsEnabled" Value="false">
                        <Setter TargetName="contentPresenter" Property="Opacity" Value=".5" />
                    </Trigger>
                </ControlTemplate.Triggers>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

<Style x:Key="MyWindowStyle" TargetType="local:MyWindow">
    <Setter Property="Foreground" Value="{DynamicResource ForegroundColorBrush}" />
    <Setter Property="Background" Value="{DynamicResource WindowBackgroundBrush}"/>
    <Setter Property="ResizeMode" Value="CanResizeWithGrip" />
    <Setter Property="UseLayoutRounding" Value="True" />
    <Setter Property="TextOptions.TextFormattingMode" Value="Display" />
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="local:MyWindow">
                <Border x:Name="WindowBorder" Margin="{Binding Source={x:Static SystemParameters.WindowNonClientFrameThickness}}" Background="{StaticResource WindowBackgroundColorBrush}">
                    <Grid>
                        <Border BorderThickness="1">
                            <AdornerDecorator>
                                <Grid x:Name="LayoutRoot">
                                    <Grid.RowDefinitions>
                                        <RowDefinition Height="25" />
                                        <RowDefinition Height="*" />
                                        <RowDefinition Height="15" />
                                    </Grid.RowDefinitions>
                                    <ContentPresenter Grid.Row="1" Grid.RowSpan="2" Margin="7"/>
                                    <Rectangle x:Name="HeaderBackground" Height="25" Fill="{DynamicResource WindowBackgroundColorBrush}" VerticalAlignment="Top" Grid.Row="0"/>
                                    <StackPanel Orientation="Horizontal" HorizontalAlignment="Right" VerticalAlignment="Top" WindowChrome.IsHitTestVisibleInChrome="True" Grid.Row="0">
                                        <Button Command="{Binding Source={x:Static SystemCommands.MinimizeWindowCommand}}" ToolTip="minimize" Style="{StaticResource WindowButtonStyle}">
                                            <Button.Content>
                                                <Grid Width="30" Height="25" RenderTransform="1,0,0,1,0,1">
                                                    <Path Data="M0,6 L8,6 Z" Width="8" Height="7" VerticalAlignment="Center" HorizontalAlignment="Center"
                                                        Stroke="{Binding Foreground, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=Button}}" StrokeThickness="2"  />
                                                </Grid>
                                            </Button.Content>
                                        </Button>
                                        <Grid Margin="1,0,1,0">
                                            <Button x:Name="Restore" Command="{Binding Source={x:Static SystemCommands.RestoreWindowCommand}}" ToolTip="restore" Visibility="Collapsed" Style="{StaticResource WindowButtonStyle}">
                                                <Button.Content>
                                                    <Grid Width="30" Height="25" UseLayoutRounding="True" RenderTransform="1,0,0,1,.5,.5">
                                                        <Path Data="M2,0 L8,0 L8,6 M0,3 L6,3 M0,2 L6,2 L6,8 L0,8 Z" Width="8" Height="8" VerticalAlignment="Center" HorizontalAlignment="Center"
                                                            Stroke="{Binding Foreground, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=Button}}" StrokeThickness="1"  />
                                                    </Grid>
                                                </Button.Content>
                                            </Button>
                                            <Button x:Name="Maximize" Command="{Binding Source={x:Static SystemCommands.MaximizeWindowCommand}}" ToolTip="maximize" Style="{StaticResource WindowButtonStyle}">
                                                <Button.Content>
                                                    <Grid Width="31" Height="25">
                                                        <Path Data="M0,1 L9,1 L9,8 L0,8 Z" Width="9" Height="8" VerticalAlignment="Center" HorizontalAlignment="Center"
                                                            Stroke="{Binding Foreground, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=Button}}" StrokeThickness="2"  />
                                                    </Grid>
                                                </Button.Content>
                                            </Button>
                                        </Grid>
                                        <Button Command="{Binding Source={x:Static SystemCommands.CloseWindowCommand}}" ToolTip="close"  Style="{StaticResource WindowButtonStyle}">
                                            <Button.Content>
                                                <Grid Width="30" Height="25" RenderTransform="1,0,0,1,0,1">
                                                    <Path Data="M0,0 L8,7 M8,0 L0,7 Z" Width="8" Height="7" VerticalAlignment="Center" HorizontalAlignment="Center"
                                                        Stroke="{Binding Foreground, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=Button}}" StrokeThickness="1.5"  />
                                                </Grid>
                                            </Button.Content>
                                        </Button>
                                    </StackPanel>
                                    <TextBlock x:Name="WindowTitleTextBlock" Grid.Row="0" Text="{TemplateBinding Title}" HorizontalAlignment="Left" TextTrimming="CharacterEllipsis" VerticalAlignment="Center"  Margin="8 -1 0 0"  FontSize="16"  Foreground="{TemplateBinding Foreground}"/>
                                    <Grid Grid.Row="2">
                                        <Path x:Name="ResizeGrip" Visibility="Collapsed" Width="12" Height="12" Margin="1" HorizontalAlignment="Right"
                                        Stroke="{StaticResource BlueColorBrush}" StrokeThickness="1" Stretch="None" Data="F1 M1,10 L3,10 M5,10 L7,10 M9,10 L11,10 M2,9 L2,11 M6,9 L6,11 M10,9 L10,11 M5,6 L7,6 M9,6 L11,6 M6,5 L6,7 M10,5 L10,7 M9,2 L11,2 M10,1 L10,3" />
                                    </Grid>
                                </Grid>
                            </AdornerDecorator>
                        </Border>
                        <Border BorderBrush="{StaticResource BlueColorBrush}" BorderThickness="1" Visibility="{Binding IsActive, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}, Converter={StaticResource bool2VisibilityConverter}}" />
                    </Grid>
                </Border>
                <ControlTemplate.Triggers>
                    <Trigger Property="WindowState" Value="Maximized">
                        <Setter TargetName="Maximize" Property="Visibility" Value="Collapsed" />
                        <Setter TargetName="Restore" Property="Visibility" Value="Visible" />
                        <Setter TargetName="LayoutRoot" Property="Margin" Value="7" />
                    </Trigger>
                    <Trigger Property="WindowState" Value="Normal">
                        <Setter TargetName="Maximize" Property="Visibility" Value="Visible" />
                        <Setter TargetName="Restore" Property="Visibility" Value="Collapsed" />
                    </Trigger>
                    <MultiTrigger>
                        <MultiTrigger.Conditions>
                            <Condition Property="ResizeMode" Value="CanResizeWithGrip" />
                            <Condition Property="WindowState" Value="Normal" />
                        </MultiTrigger.Conditions>
                        <Setter TargetName="ResizeGrip" Property="Visibility" Value="Visible" />
                    </MultiTrigger>
                </ControlTemplate.Triggers>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
    <Setter Property="WindowChrome.WindowChrome">
        <Setter.Value>
            <WindowChrome CornerRadius="0" GlassFrameThickness="1" UseAeroCaptionButtons="False" />
        </Setter.Value>
    </Setter>
</Style>

How can I check whether a radio button is selected with JavaScript?

http://www.somacon.com/p143.php/

function getCheckedValue(radioObj) {
    if(!radioObj)
        return "";
    var radioLength = radioObj.length;
    if(radioLength == undefined)
        if(radioObj.checked)
            return radioObj.value;
        else
            return "";
    for(var i = 0; i < radioLength; i++) {
        if(radioObj[i].checked) {
            return radioObj[i].value;
        }
    }
    return "";
}

Convert string to date in bash

We can use date -d option

1) Change format to "%Y-%m-%d" format i.e 20121212 to 2012-12-12

date -d '20121212' +'%Y-%m-%d'

2)Get next or last day from a given date=20121212. Like get a date 7 days in past with specific format

date -d '20121212 -7 days' +'%Y-%m-%d'

3) If we are getting date in some variable say dat

dat2=$(date -d "$dat -1 days" +'%Y%m%d')

What is a predicate in c#?

Predicate<T> is a functional construct providing a convenient way of basically testing if something is true of a given T object.

For example suppose I have a class:

class Person {
    public string Name { get; set; }
    public int Age { get; set; }
}

Now let's say I have a List<Person> people and I want to know if there's anyone named Oscar in the list.

Without using a Predicate<Person> (or Linq, or any of that fancy stuff), I could always accomplish this by doing the following:

Person oscar = null;
foreach (Person person in people) {
    if (person.Name == "Oscar") {
        oscar = person;
        break;
    }
}

if (oscar != null) {
    // Oscar exists!
}

This is fine, but then let's say I want to check if there's a person named "Ruth"? Or a person whose age is 17?

Using a Predicate<Person>, I can find these things using a LOT less code:

Predicate<Person> oscarFinder = (Person p) => { return p.Name == "Oscar"; };
Predicate<Person> ruthFinder = (Person p) => { return p.Name == "Ruth"; };
Predicate<Person> seventeenYearOldFinder = (Person p) => { return p.Age == 17; };

Person oscar = people.Find(oscarFinder);
Person ruth = people.Find(ruthFinder);
Person seventeenYearOld = people.Find(seventeenYearOldFinder);

Notice I said a lot less code, not a lot faster. A common misconception developers have is that if something takes one line, it must perform better than something that takes ten lines. But behind the scenes, the Find method, which takes a Predicate<T>, is just enumerating after all. The same is true for a lot of Linq's functionality.

So let's take a look at the specific code in your question:

Predicate<int> pre = delegate(int a){ return a % 2 == 0; };

Here we have a Predicate<int> pre that takes an int a and returns a % 2 == 0. This is essentially testing for an even number. What that means is:

pre(1) == false;
pre(2) == true;

And so on. This also means, if you have a List<int> ints and you want to find the first even number, you can just do this:

int firstEven = ints.Find(pre);

Of course, as with any other type that you can use in code, it's a good idea to give your variables descriptive names; so I would advise changing the above pre to something like evenFinder or isEven -- something along those lines. Then the above code is a lot clearer:

int firstEven = ints.Find(evenFinder);

Remove border from IFrame

If you are using the iFrame to fit the width and height of the entire screen, which I am assuming you are not based on the 300x300 size, you must also set the body margins to "0" like this:

<body style="margin:0px;">

Pandas read_csv from url

url = "https://github.com/cs109/2014_data/blob/master/countries.csv"
c = pd.read_csv(url, sep = "\t")

How to use the CancellationToken property?

You can implement your work method as follows:

private static void Work(CancellationToken cancelToken)
{
    while (true)
    {
        if(cancelToken.IsCancellationRequested)
        {
            return;
        }
        Console.Write("345");
    }
}

That's it. You always need to handle cancellation by yourself - exit from method when it is appropriate time to exit (so that your work and data is in consistent state)

UPDATE: I prefer not writing while (!cancelToken.IsCancellationRequested) because often there are few exit points where you can stop executing safely across loop body, and loop usually have some logical condition to exit (iterate over all items in collection etc.). So I believe it's better not to mix that conditions as they have different intention.

Cautionary note about avoiding CancellationToken.ThrowIfCancellationRequested():

Comment in question by Eamon Nerbonne:

... replacing ThrowIfCancellationRequested with a bunch of checks for IsCancellationRequested exits gracefully, as this answer says. But that's not just an implementation detail; that affects observable behavior: the task will no longer end in the cancelled state, but in RanToCompletion. And that can affect not just explicit state checks, but also, more subtly, task chaining with e.g. ContinueWith, depending on the TaskContinuationOptions used. I'd say that avoiding ThrowIfCancellationRequested is dangerous advice.

Delete a row from a table by id

Something quick and dirty:

<script type='text/javascript'>
function del_tr(remtr)  
{   
    while((remtr.nodeName.toLowerCase())!='tr')
        remtr = remtr.parentNode;

    remtr.parentNode.removeChild(remtr);
}
function del_id(id)  
{   
        del_tr(document.getElementById(id));
}
</script>

if you place

<a href='' onclick='del_tr(this);return false;'>x</a>

anywhere within the row you want to delete, than its even working without any ids

Using Case/Switch and GetType to determine the object

In the MSDN blog post Many Questions: switch on type is some information on why .NET does not provide switching on types.

As usual - workarounds always exists.

This one isn't mine, but unfortunately I have lost the source. It makes switching on types possible, but I personally think it's quite awkward (the dictionary idea is better):

  public class Switch
  {
      public Switch(Object o)
      {
          Object = o;
      }

      public Object Object { get; private set; }
  }


  /// <summary>
  /// Extensions, because otherwise casing fails on Switch==null
  /// </summary>
  public static class SwitchExtensions
  {
      public static Switch Case<T>(this Switch s, Action<T> a)
            where T : class
      {
          return Case(s, o => true, a, false);
      }

      public static Switch Case<T>(this Switch s, Action<T> a,
           bool fallThrough) where T : class
      {
          return Case(s, o => true, a, fallThrough);
      }

      public static Switch Case<T>(this Switch s,
          Func<T, bool> c, Action<T> a) where T : class
      {
          return Case(s, c, a, false);
      }

      public static Switch Case<T>(this Switch s,
          Func<T, bool> c, Action<T> a, bool fallThrough) where T : class
      {
          if (s == null)
          {
              return null;
          }

          T t = s.Object as T;
          if (t != null)
          {
              if (c(t))
              {
                  a(t);
                  return fallThrough ? s : null;
              }
          }

          return s;
      }
  }

Usage:

 new Switch(foo)
     .Case<Fizz>
         (action => { doingSomething = FirstMethodCall(); })
     .Case<Buzz>
         (action => { return false; })

React.js: Set innerHTML vs dangerouslySetInnerHTML

Based on (dangerouslySetInnerHTML).

It's a prop that does exactly what you want. However they name it to convey that it should be use with caution

How to get time in milliseconds since the unix epoch in Javascript?

Date.now() returns a unix timestamp in milliseconds.

_x000D_
_x000D_
const now = Date.now(); // Unix timestamp in milliseconds_x000D_
console.log( now );
_x000D_
_x000D_
_x000D_

Prior to ECMAScript5 (I.E. Internet Explorer 8 and older) you needed to construct a Date object, from which there are several ways to get a unix timestamp in milliseconds:

_x000D_
_x000D_
console.log( +new Date );_x000D_
console.log( (new Date).getTime() );_x000D_
console.log( (new Date).valueOf() );
_x000D_
_x000D_
_x000D_

How can I increase a scrollbar's width using CSS?

This can be done in WebKit-based browsers (such as Chrome and Safari) with only CSS:

::-webkit-scrollbar {
    width: 2em;
    height: 2em
}
::-webkit-scrollbar-button {
    background: #ccc
}
::-webkit-scrollbar-track-piece {
    background: #888
}
::-webkit-scrollbar-thumb {
    background: #eee
}?

JSFiddle Demo


References:

AngularJS $watch window resize inside directive

// Following is angular 2.0 directive for window re size that adjust scroll bar for give element as per your tag

---- angular 2.0 window resize directive.
import { Directive, ElementRef} from 'angular2/core';

@Directive({
       selector: '[resize]',
       host: { '(window:resize)': 'onResize()' } // Window resize listener
})

export class AutoResize {

element: ElementRef; // Element that associated to attribute.
$window: any;
       constructor(_element: ElementRef) {

         this.element = _element;
         // Get instance of DOM window.
         this.$window = angular.element(window);

         this.onResize();

    }

    // Adjust height of element.
    onResize() {
         $(this.element.nativeElement).css('height', (this.$window.height() - 163) + 'px');
   }
}

How to set null to a GUID property

you can make guid variable to accept null first using ? operator then you use Guid.Empty or typecast it to null using (Guid?)null;

eg:

 Guid? id = Guid.Empty;

or

 Guid? id =  (Guid?)null;

django MultiValueDictKeyError error, how do I deal with it

First check if the request object have the 'is_private' key parameter. Most of the case's this MultiValueDictKeyError occurred for missing key in the dictionary-like request object. Because dictionary is an unordered key, value pair “associative memories” or “associative arrays”

In another word. request.GET or request.POST is a dictionary-like object containing all request parameters. This is specific to Django.

The method get() returns a value for the given key if key is in the dictionary. If key is not available then returns default value None.

You can handle this error by putting :

is_private = request.POST.get('is_private', False);

How to Customize the time format for Python logging?

if using logging.config.fileConfig with a configuration file use something like:

[formatter_simpleFormatter]
format=%(asctime)s - %(name)s - %(levelname)s - %(message)s
datefmt=%Y-%m-%d %H:%M:%S

How to get commit history for just one branch?

Note: if you limit that log to the last n commit (last 3 commits for instance, git log -3), make sure to put a space between 'n' and your branch:

git log -3 master..

Before Git 2.1 (August 2014), this mistake: git log -3master.. would actually show you the last 3 commits of the current branch (here my_experiment), ignoring the master limit (meaning if my_experiment contains only one commit, 3 would still be listed, 2 of them from master)

See commit e3fa568 by Junio C Hamano (gitster):

revision: parse "git log -<count>" more carefully

This mistyped command line simply ignores "master" and ends up showing two commits from the current HEAD:

$ git log -2master

because we feed "2master" to atoi() without making sure that the whole string is parsed as an integer.

Use the strtol_i() helper function instead.

Stop Visual Studio from mixing line endings in files

see http://editorconfig.org and https://docs.microsoft.com/en-us/visualstudio/ide/create-portable-custom-editor-options?view=vs-2017

  1. If it does not exist, add a new file called .editorconfig for your project

  2. manipulate editor config to use your preferred behaviour.

I prefer spaces over tabs, and CRLF for all code files.
Here's my .editorconfig

# http://editorconfig.org
root = true

[*]
indent_style = space
indent_size = 4
end_of_line = crlf
charset = utf-8
trim_trailing_whitespace = true
insert_final_newline = true

[*.md]
trim_trailing_whitespace = false

[*.tmpl.html]
indent_size = 4

[*.scss]
indent_size = 2 

How to create a drop-down list?

Spinner xml:

<Spinner
      android:id="@+id/spinner"
      android:layout_width="wrap_content"
      android:layout_height="match_parent" />

java:

public class MainActivity extends AppCompatActivity implements AdapterView.OnItemSelectedListener{

    private Spinner spinner;
    private static final String[] paths = {"item 1", "item 2", "item 3"};

    @Override
    protected void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_layout);

        spinner = (Spinner)findViewById(R.id.spinner);
        ArrayAdapter<String>adapter = new ArrayAdapter<String>(MainActivity.this,
                android.R.layout.simple_spinner_item,paths);

        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinner.setAdapter(adapter);
        spinner.setOnItemSelectedListener(this);

    }

    @Override
    public void onItemSelected(AdapterView<?> parent, View v, int position, long id) {

        switch (position) {
            case 0:
                // Whatever you want to happen when the first item gets selected
                break;
            case 1:
                // Whatever you want to happen when the second item gets selected
                break;
            case 2:
                // Whatever you want to happen when the thrid item gets selected
                break;

        }
    }

    @Override
    public void onNothingSelected(AdapterView<?> parent) {
            // TODO Auto-generated method stub
        }

}

Parsing JSON with Unix tools

Using Node.js

If the system has installed, it's possible to use the -p print and -e evaulate script flags with JSON.parse to pull out any value that is needed.

A simple example using the JSON string { "foo": "bar" } and pulling out the value of "foo":

$ node -pe 'JSON.parse(process.argv[1]).foo' '{ "foo": "bar" }'
bar

Because we have access to cat and other utilities, we can use this for files:

$ node -pe 'JSON.parse(process.argv[1]).foo' "$(cat foobar.json)"
bar

Or any other format such as an URL that contains JSON:

$ node -pe 'JSON.parse(process.argv[1]).name' "$(curl -s https://api.github.com/users/trevorsenior)"
Trevor Senior

Fundamental difference between Hashing and Encryption algorithms

Basic overview of hashing and encryption/decryption techniques are.

Hashing:

If you hash any plain text again you can not get the same plain text from hashed text. Simply, It's a one-way process.

hashing


Encryption and Decryption:

If you encrypt any plain text with a key again you can get same plain text by doing decryption on encrypted text with same(symetric)/diffrent(asymentric) key.

encryption and decryption


UPDATE: To address the points mentioned in the edited question.

1. When to use hashes vs encryptions

Hashing is useful if you want to send someone a file. But you are afraid that someone else might intercept the file and change it. So a way that the recipient can make sure that it is the right file is if you post the hash value publicly. That way the recipient can compute the hash value of the file received and check that it matches the hash value.

Encryption is good if you say have a message to send to someone. You encrypt the message with a key and the recipient decrypts with the same (or maybe even a different) key to get back the original message. credits


2. What makes a hash or encryption algorithm different (from a theoretical/mathematical level) i.e. what makes hashes irreversible (without aid of a rainbow tree)

Basically hashing is an operation that loses information but not encryption. Let's look at the difference in simple mathematical way for our easy understanding, of course both have much more complicated mathematical operation with repetitions involved in it

Encryption/Decryption (Reversible):


Addition:

4 + 3 = 7  

This can be reversed by taking the sum and subtracting one of the addends

7 - 3 = 4     

Multiplication:

4 * 5 = 20  

This can be reversed by taking the product and dividing by one of the factors

20 / 4 = 5    

So, here we could assume one of the addends/factors is a decrpytion key and result(7,20) is an excrypted text.


Hashing (Not Reversible):


Modulo division:

22 % 7 = 1   

This can not be reversed because there is no operation that you can do to the quotient and the dividend to reconstitute the divisor (or vice versa).

Can you find an operation to fill in where the '?' is?

1  ?  7 = 22  
1  ?  22 = 7

So hash functions have the same mathematical quality as modulo division and looses the information.

credits

How to dismiss keyboard for UITextView with return key?

Swift Code

Implement UITextViewDelegate in your class / View like so:

class MyClass: UITextViewDelegate  { ...

set the textView delegate to self

myTextView.delegate = self

And then implement the following:

  func textViewDidChange(_ textView: UITextView) {
    if textView.text.characters.count >= 1 {

        if let lastChar = textView.text.characters.last {

            if(lastChar == "\n"){

              textView.text = textView.text.substring(to: textView.text.index(before: textView.text.endIndex))
              textView.resignFirstResponder()
            }
        }
    }
}

EDIT I updated the code because it is never a good idea to change the user input in a textfield to for a workarround and not resetting the state after the hack code completed.

Sort a list of tuples by 2nd item (integer value)

From python wiki:

>>> from operator import itemgetter, attrgetter    
>>> sorted(student_tuples, key=itemgetter(2))
[('dave', 'B', 10), ('jane', 'B', 12), ('john', 'A', 15)]    
>>> sorted(student_objects, key=attrgetter('age'))
[('dave', 'B', 10), ('jane', 'B', 12), ('john', 'A', 15)]

Multiple Buttons' OnClickListener() android

You could set the property:

android:onClick="buttonClicked"

in the xml file for each of those buttons, and use this in the java code:

public void buttonClicked(View view) {

    if (view.getId() == R.id.button1) {
        // button1 action
    } else if (view.getId() == R.id.button2) {
        //button2 action
    } else if (view.getId() == R.id.button3) {
        //button3 action
    }

}

Convert java.util.date default format to Timestamp in Java

You can use the Calendar class to convert Date

public long getDifference()
{
    SimpleDateFormat sdf = new SimpleDateFormat("EEE MMM dd kk:mm:ss z yyyy");
    Date d = sdf.parse("Mon May 27 11:46:15 IST 2013");

    Calendar c = Calendar.getInstance();
    c.setTime(d);
    long time = c.getTimeInMillis();
    long curr = System.currentTimeMillis();
    long diff = curr - time;    //Time difference in milliseconds
    return diff/1000;
}

Populating Spring @Value during Unit Test

Its quite old question, and I'm not sure if it was an option at that time, but this is the reason why I always prefer DependencyInjection by the constructor than by the value.

I can imagine that your class might look like this:

class ExampleClass{

   @Autowired
   private Dog dog;

   @Value("${this.property.value}") 
   private String thisProperty;

   ...other stuff...
}

You can change it to:

class ExampleClass{

   private Dog dog;
   private String thisProperty;

   //optionally @Autowire
   public ExampleClass(final Dog dog, @Value("${this.property.value}") final String thisProperty){
      this.dog = dog;
      this.thisProperty = thisProperty;
   }

   ...other stuff...
}

With this implementation, the spring will know what to inject automatically, but for unit testing, you can do whatever you need. For example Autowire every dependency wth spring, and inject them manually via constructor to create "ExampleClass" instance, or use only spring with test property file, or do not use spring at all and create all object yourself.

Uncaught SyntaxError: Unexpected token with JSON.parse

The error you are getting i.e. "unexpected token o" is because json is expected but object is obtained while parsing. That "o" is the first letter of word "object".

Does Python SciPy need BLAS?

On Fedora, this works:

 yum install lapack lapack-devel blas blas-devel
 pip install numpy
 pip install scipy

Remember to install 'lapack-devel' and 'blas-devel' in addition to 'blas' and 'lapack' otherwise you'll get the error you mentioned or the "numpy.distutils.system_info.LapackNotFoundError" error.

How to allow only numbers in textbox in mvc4 razor

Hi try the following....

<div class="editor-field">
  <%: Html.TextBoxFor(m => m.UserName, new {onkeydown="return ValidateNumber(event);" })%>
  <%: Html.ValidationMessageFor(m => m.UserName) %>
</div>

SCRIPT

<script type="text/javascript">
   function ValidateNumber(e) {
       var evt = (e) ? e : window.event;
       var charCode = (evt.keyCode) ? evt.keyCode : evt.which;
       if (charCode > 31 && (charCode < 48 || charCode > 57)) {
           return false;
       }
       return true;
   };

Disable / Check for Mock Location (prevent gps spoofing)

try this code its very simple and usefull

  public boolean isMockLocationEnabled() {
        boolean isMockLocation = false;
        try {
            //if marshmallow
            if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                AppOpsManager opsManager = (AppOpsManager) getApplicationContext().getSystemService(Context.APP_OPS_SERVICE);
                isMockLocation = (opsManager.checkOp(AppOpsManager.OPSTR_MOCK_LOCATION, android.os.Process.myUid(), BuildConfig.APPLICATION_ID)== AppOpsManager.MODE_ALLOWED);
            } else {
                // in marshmallow this will always return true
                isMockLocation = !android.provider.Settings.Secure.getString(getApplicationContext().getContentResolver(), "mock_location").equals("0");
            }
        } catch (Exception e) {
            return isMockLocation;
        }
        return isMockLocation;
    }

Change New Google Recaptcha (v2) Width

.g-recaptcha{
    -moz-transform:scale(1.1);
    -ms-transform:scale(1.1); 
    -o-transform:scale(1.1); 
    -moz-transform-origin:0; 
    -ms-transform-origin:0;
    -o-transform-origin:0;
    -webkit-transform:scale(1.1);
    transform:scale(1.1);
    -webkit-transform-origin:0 0;
    transform-origin:0;
    filter: progid:DXImageTransform.Microsoft.Matrix(M11=1.1,M12=0,M21=0,M22=1.1,SizingMethod='auto expand');
}

Launch Image does not show up in my iOS App

I set up "LaunchImage" in my asset catalog and simply cleared the "Launch Screen" field et voila ! I had the launch images appear ...

Mathematical functions in Swift

To be perfectly precise, Darwin is enough. No need to import the whole Cocoa framework.

import Darwin

Of course, if you need elements from Cocoa or Foundation or other higher level frameworks, you can import them instead

Regular expression for checking if capital letters are found consecutively in a string?

Edit: 2015-10-26: thanks for the upvotes - but take a look at tchrist's answer, especially if you develop for the web or something more "international".

Oren Trutners answer isn't quite right (see sample input of "RightHerE" which must be matched but isn't)

Here is the correct solution:

(?!^.*[A-Z]{2,}.*$)^[A-Za-z]*$

edit:

(?!^.*[A-Z]{2,}.*$)  // don't match the whole expression if there are two or more consecutive uppercase letters
^[A-Za-z]*$          // match uppercase and lowercase letters

/edit

the key for the solution is a negative lookahead see: http://www.regular-expressions.info/lookaround.html

What's the difference between "&nbsp;" and " "?

Not an answer as much as examples...

Example #1:

<div style="width:45px; height:45px; border: solid thin red; overflow: visible">
    Hello&nbsp;There
</div>  

Example #2:

<div style="width:45px; height:45px; border: solid thin red; overflow: visible">
    Hello There
</div>

And link to the fiddle.

Proper way to use **kwargs in Python

You could do something like this

class ExampleClass:
    def __init__(self, **kwargs):
        arguments = {'val':1, 'val2':2}
        arguments.update(kwargs)
        self.val = arguments['val']
        self.val2 = arguments['val2']

C fopen vs open

I changed to open() from fopen() for my application, because fopen was causing double reads every time I ran fopen fgetc . Double reads were disruptive of what I was trying to accomplish. open() just seems to do what you ask of it.

Conditional WHERE clause in SQL Server

The problem with your query is that in CASE expressions, the THEN and ELSE parts have to have an expression that evaluates to a number or a varchar or any other datatype but not to a boolean value.

You just need to use boolean logic (or rather the ternary logic that SQL uses) and rewrite it:

WHERE 
    DateDropped = 0
AND ( @JobsOnHold = 1 AND DateAppr >= 0 
   OR (@JobsOnHold <> 1 OR @JobsOnHold IS NULL) AND DateAppr <> 0
    )

How to use external ".js" files

Code like this

 <html>
    <head>
          <script type="text/javascript" src="path/to/script.js"></script>
          <!--other script and also external css included over here-->
    </head>
    <body>
        <form>
            <select name="users" onChange="showUser(this.value)">
               <option value="1">Tom</option>
               <option value="2">Bob</option>
               <option value="3">Joe</option>
            </select>
        </form>
    </body>
    </html>

I hope it will help you.... thanks

Adding 1 hour to time variable

for this problem please follow bellow code:

$time= '10:09';
$new_time=date('H:i',strtotime($time.'+ 1 hour'));
echo $new_time;`
// now output will be: 11:09

What is the max size of VARCHAR2 in PL/SQL and SQL?

As per official documentation link shared by Andre Kirpitch, Oracle 10g gives a maximum size of 4000 bytes or characters for varchar2. If you are using a higher version of oracle (for example Oracle 12c), you can get a maximum size upto 32767 bytes or characters for varchar2. To utilize the extended datatype feature of oracle 12, you need to start oracle in upgrade mode. Follow the below steps in command prompt:

1) Login as sysdba (sqlplus / as sysdba)

2) SHUTDOWN IMMEDIATE;

3) STARTUP UPGRADE;

4) ALTER SYSTEM SET max_string_size=extended;

5) Oracle\product\12.1.0.2\rdbms\admin\utl32k.sql

6) SHUTDOWN IMMEDIATE;

7) STARTUP;

How to create a popup windows in javafx

You can either create a new Stage, add your controls into it or if you require the POPUP as Dialog box, then you may consider using DialogsFX or ControlsFX(Requires JavaFX8)

For creating a new Stage, you can use the following snippet

@Override
public void start(final Stage primaryStage) {
    Button btn = new Button();
    btn.setText("Open Dialog");
    btn.setOnAction(
        new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent event) {
                final Stage dialog = new Stage();
                dialog.initModality(Modality.APPLICATION_MODAL);
                dialog.initOwner(primaryStage);
                VBox dialogVbox = new VBox(20);
                dialogVbox.getChildren().add(new Text("This is a Dialog"));
                Scene dialogScene = new Scene(dialogVbox, 300, 200);
                dialog.setScene(dialogScene);
                dialog.show();
            }
         });
    }

If you don't want it to be modal (block other windows), use:

dialog.initModality(Modality.NONE);

Python - How do you run a .py file?

If you want to run .py files in Windows, Try installing Git bash Then download python(Required Version) from python.org and install in the main c drive folder

For me, its :

"C:\Python38"

then open Git Bash and go to the respective folder where your .py file is stored :

For me, its :

File Location : "Downloads" File Name : Train.py

So i changed my Current working Directory From "C:/User/(username)/" to "C:/User/(username)/Downloads"

then i will run the below command

" /c/Python38/python Train.py "

and it will run successfully.

But if it give the below error :

from sklearn.model_selection import train_test_split ModuleNotFoundError: No module named 'sklearn'

Then Do not panic :

and use this command :

" /c/Python38/Scripts/pip install sklearn "

and after it has installed sklearn go back and run the previous command :

" /c/Python38/python Train.py "

and it will run successfully.

!!!!HAPPY LEARNING !!!!

What MIME type should I use for CSV?

Strange behavior with MS Excel: If i export to "text based, comma-separated format (csv)" this is the mime-type I get after uploading on my webserver:

[name] => data.csv
[type] => application/vnd.ms-excel

So Microsoft seems to be doing own things again, regardless of existing standards: https://en.wikipedia.org/wiki/Comma-separated_values

Copy values from one column to another in the same table

you can do it with Procedure also so i have a procedure for this

 DELIMITER $$
 CREATE PROCEDURE copyTo()
       BEGIN
               DECLARE x  INT;
            DECLARE str varchar(45);
              SET x = 1;
            set str = '';
              WHILE x < 5 DO
                set  str = (select source_col from emp where id=x);
            update emp set target_col =str where id=x;      
            SET  x = x + 1;
                END WHILE;

       END$$
   DELIMITER ;

Is it possible to convert char[] to char* in C?

If you have char[] c then you can do char* d = &c[0] and access element c[1] by doing *(d+1), etc.

Insert data into a view (SQL Server)

INSERT INTO viewname (Column name) values (value);

Convert an ArrayList to an object array

Convert an ArrayList to an object array

ArrayList has a constructor that takes a Collection, so the common idiom is:

List<T> list = new ArrayList<T>(Arrays.asList(array));

Which constructs a copy of the list created by the array.

now, Arrays.asList(array) will wrap the array, so changes to the list will affect the array, and visa versa. Although you can't add or remove

elements from such a list.

JavaScript chop/slice/trim off last character in string

Performance

Today 2020.05.13 I perform tests of chosen solutions on Chrome v81.0, Safari v13.1 and Firefox v76.0 on MacOs High Sierra v10.13.6.

Conclusions

  • the slice(0,-1)(D) is fast or fastest solution for short and long strings and it is recommended as fast cross-browser solution
  • solutions based on substring (C) and substr(E) are fast
  • solutions based on regular expressions (A,B) are slow/medium fast
  • solutions B, F and G are slow for long strings
  • solution F is slowest for short strings, G is slowest for long strings

enter image description here

Details

I perform two tests for solutions A, B, C, D, E(ext), F, G(my)

  • for 8-char short string (from OP question) - you can run it HERE
  • for 1M long string - you can run it HERE

Solutions are presented in below snippet

_x000D_
_x000D_
function A(str) {
  return str.replace(/.$/, '');
}

function B(str) {
  return str.match(/(.*).$/)[1];
}

function C(str) {
  return str.substring(0, str.length - 1);
}

function D(str) {
  return str.slice(0, -1); 
}

function E(str) {
  return str.substr(0, str.length - 1);
}

function F(str) {
  let s= str.split("");
  s.pop();
  return s.join("");
}

function G(str) {
  let s='';
  for(let i=0; i<str.length-1; i++) s+=str[i];
  return s;
 }



// ---------
// TEST
// ---------

let log = (f)=>console.log(`${f.name}: ${f("12345.00")}`);

[A,B,C,D,E,F,G].map(f=>log(f));
_x000D_
This snippet only presents soutions
_x000D_
_x000D_
_x000D_

Here are example results for Chrome for short string

enter image description here

How to solve WAMP and Skype conflict on Windows 7?

  1. open skype
  2. click tools and go to options
  3. click advanced option from left side
  4. click connection
  5. unchecked (Use port 80 and 443 as alternatives for incoming connection)

Uncaught SoapFault exception: [HTTP] Error Fetching http headers

In my apache error log, I saw:

[Tue Feb 16 14:55:02 2010] [notice] child pid 9985 exit signal File size limit exceeded (25)

So I, removed all the contents of my largest log file 2.1GB /var/log/system.log. Now everything works.

Running python script inside ipython

for Python 3.6.5

import os
os.getcwd()
runfile('testing.py')

How to print colored text to the terminal?

If you are using Django:

>>> from django.utils.termcolors import colorize
>>> print colorize("Hello, World!", fg="blue", bg='red',
...                 opts=('bold', 'blink', 'underscore',))
Hello World!
>>> help(colorize)

Snapshot:

Image

(I generally use colored output for debugging on runserver terminal, so I added it.)

You can test if it is installed in your machine: $ python -c "import django; print django.VERSION". To install it, check: How to install Django

Give it a try!!

How to make nginx to listen to server_name:port

The server_namedocs directive is used to identify virtual hosts, they're not used to set the binding.

netstat tells you that nginx listens on 0.0.0.0:80 which means that it will accept connections from any IP.

If you want to change the IP nginx binds on, you have to change the listendocs rule.
So, if you want to set nginx to bind to localhost, you'd change that to:

listen 127.0.0.1:80;

In this way, requests that are not coming from localhost are discarded (they don't even hit nginx).

TypeError: 'undefined' is not an object

try out this if you want to assign value to object and it is showing this error in angular..

crate object in construtor

this.modelObj = new Model(); //<---------- after declaring object above

How do I POST urlencoded form data with $http without jQuery?

All of these look like overkill (or don't work)... just do this:

$http.post(loginUrl, `username=${ encodeURIComponent(username) }` +
                     `&password=${ encodeURIComponent(password) }` +
                     '&grant_type=password'
).success(function (data) {

Does Arduino use C or C++?

Arduino sketches are written in C++.

Here is a typical construct you'll encounter:

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
...
lcd.begin(16, 2);
lcd.print("Hello, World!");

That's C++, not C.

Hence do yourself a favor and learn C++. There are plenty of books and online resources available.

How to print the current Stack Trace in .NET without any exception?

There are two ways to do this. The System.Diagnostics.StackTrace() will give you a stack trace for the current thread. If you have a reference to a Thread instance, you can get the stack trace for that via the overloaded version of StackTrace().

You may also want to check out Stack Overflow question How to get non-current thread's stacktrace?.

how to auto select an input field and the text in it on page load

Let the input text field automatically get focus when the page loads:

<form action="/action_page.php">
  <input type="text" id="fname" name="fname" autofocus>
  <input type="submit">
</form>

Source : https://www.w3schools.com/tags/att_input_autofocus.asp

How to filter for multiple criteria in Excel?

The regular filter options in Excel don't allow for more than 2 criteria settings. To do 2+ criteria settings, you need to use the Advanced Filter option. Below are the steps I did to try this out.

http://www.bettersolutions.com/excel/EDZ483/QT419412321.htm

Set up the criteria. I put this above the values I want to filter. You could do that or put on a different worksheet. Note that putting the criteria in rows will make it an 'OR' filter and putting them in columns will make it an 'AND' filter.

  1. E1 : Letters
  2. E2 : =m
  3. E3 : =h
  4. E4 : =j

I put the data starting on row 5:

  1. A5 : Letters
  2. A6 :
  3. A7 :
  4. ...

Select the first data row (A6) and click the Advanced Filter option. The List Range should be pre-populated. Select the Criteria range as E1:E4 and click OK.

That should be it. Note that I use the '=' operator. You will want to use something a bit different to test for file extensions.

How to remove all subviews of a view in Swift?

For iOS/Swift, to get rid of all subviews I use:

for v in view.subviews{
   v.removeFromSuperview()
}

to get rid of all subviews of a particular class (like UILabel) I use:

for v in view.subviews{
   if v is UILabel{
      v.removeFromSuperview()
   }
}

Suppress output of a function

invisible(cat("Dataset: ", dataset, fill = TRUE))
invisible(cat(" Width: " ,width, fill = TRUE))
invisible(cat(" Bin1:  " ,bin1interval, fill = TRUE))
invisible(cat(" Bin2:  " ,bin2interval, fill = TRUE))
invisible(cat(" Bin3:  " ,bin3interval, fill = TRUE))

produces output without NULL at the end of the line or on the next line

Dataset:  17 19 26 29 31 32 34 45 47 51 52 59 60 62 63
Width:  15.33333

Bin1:   17 32.33333
Bin2:   32.33333 47.66667
Bin3:   47.66667 63

Deactivate or remove the scrollbar on HTML

put this code in your html header:

<style type="text/css">
html {
        overflow: auto;
}
</style>