Programs & Examples On #File pointer

Check if a value is within a range of numbers

You must want to determine the lower and upper bound before writing the condition

function between(value,first,last) {

 let lower = Math.min(first,last) , upper = Math.max(first,last);
 return value >= lower &&  value <= upper ;

}

How to get an input text value in JavaScript

<input type="password"id="har">
<input type="submit"value="get password"onclick="har()">
<script>
    function har() {
        var txt_val;
        txt_val = document.getElementById("har").value;
        alert(txt_val);
    }
</script>

Sort JavaScript object by key

Object.keys(unordered).sort().reduce(
    (acc,curr) => ({...acc, [curr]:unordered[curr]})
    , {}
)

How to tell CRAN to install package dependencies automatically?

On your own system, try

install.packages("foo", dependencies=...)

with the dependencies= argument is documented as

dependencies: logical indicating to also install uninstalled packages
      which these packages depend on/link to/import/suggest (and so
      on recursively).  Not used if ‘repos = NULL’.  Can also be a
      character vector, a subset of ‘c("Depends", "Imports",
      "LinkingTo", "Suggests", "Enhances")’.

      Only supported if ‘lib’ is of length one (or missing), so it
      is unambiguous where to install the dependent packages.  If
      this is not the case it is ignored, with a warning.

      The default, ‘NA’, means ‘c("Depends", "Imports",
      "LinkingTo")’.

      ‘TRUE’ means (as from R 2.15.0) to use ‘c("Depends",
      "Imports", "LinkingTo", "Suggests")’ for ‘pkgs’ and
      ‘c("Depends", "Imports", "LinkingTo")’ for added
      dependencies: this installs all the packages needed to run
      ‘pkgs’, their examples, tests and vignettes (if the package
      author specified them correctly).

so you probably want a value TRUE.

In your package, list what is needed in Depends:, see the Writing R Extensions manual which is pretty clear on this.

Tooltip with HTML content without JavaScript

Pure CSS:

_x000D_
_x000D_
.app-tooltip {_x000D_
  position: relative;_x000D_
}_x000D_
_x000D_
.app-tooltip:before {_x000D_
  content: attr(data-title);_x000D_
  background-color: rgba(97, 97, 97, 0.9);_x000D_
  color: #fff;_x000D_
  font-size: 12px;_x000D_
  padding: 10px;_x000D_
  position: absolute;_x000D_
  bottom: -50px;_x000D_
  opacity: 0;_x000D_
  transition: all 0.4s ease;_x000D_
  font-weight: 500;_x000D_
  z-index: 2;_x000D_
}_x000D_
_x000D_
.app-tooltip:after {_x000D_
  content: '';_x000D_
  position: absolute;_x000D_
  opacity: 0;_x000D_
  left: 5px;_x000D_
  bottom: -16px;_x000D_
  border-style: solid;_x000D_
  border-width: 0 10px 10px 10px;_x000D_
  border-color: transparent transparent rgba(97, 97, 97, 0.9) transparent;_x000D_
  transition: all 0.4s ease;_x000D_
}_x000D_
_x000D_
.app-tooltip:hover:after,_x000D_
.app-tooltip:hover:before {_x000D_
  opacity: 1;_x000D_
}
_x000D_
<div href="#" class="app-tooltip" data-title="Your message here"> Test here</div>
_x000D_
_x000D_
_x000D_

How do I compile with -Xlint:unchecked?

I know it sounds weird, but I'm pretty sure this is your problem:

Somewhere in MyGui.java you're using a generic collection without specifying the type. For example if you're using an ArrayList somewhere, you are doing this:

List list = new ArrayList();

When you should be doing this:

List<String> list = new ArrayList<String>();

What is the difference between a Docker image and a container?

In short:

Container is a division (virtual) in a kernel which shares a common OS and runs an image (Docker image).

A container is a self-sustainable application that will have packages and all the necessary dependencies together to run the code.

How to write both h1 and h2 in the same line?

Keyword float:

<h1 style="text-align:left;float:left;">Title</h1> 
<h2 style="text-align:right;float:right;">Context</h2> 
<hr style="clear:both;"/>

How can I print the contents of a hash in Perl?

For debugging purposes I will often use YAML.

use strict;
use warnings;

use YAML;

my %variable = ('abc' => 123, 'def' => [4,5,6]);

print "# %variable\n", Dump \%variable;

Results in:

# %variable
---
abc: 123
def:
  - 4
  - 5
  - 6

Other times I will use Data::Dump. You don't need to set as many variables to get it to output it in a nice format than you do for Data::Dumper.

use Data::Dump = 'dump';

print dump(\%variable), "\n";
{ abc => 123, def => [4, 5, 6] }

More recently I have been using Data::Printer for debugging.

use Data::Printer;
p %variable;
{
    abc   123,
    def   [
        [0] 4,
        [1] 5,
        [2] 6
    ]
}

( Result can be much more colorful on a terminal )

Unlike the other examples I have shown here, this one is designed explicitly to be for display purposes only. Which shows up more easily if you dump out the structure of a tied variable or that of an object.

use strict;
use warnings;

use MTie::Hash;
use Data::Printer;

my $h = tie my %h, "Tie::StdHash";
@h{'a'..'d'}='A'..'D';
p %h;
print "\n";
p $h;
{
    a   "A",
    b   "B",
    c   "C",
    d   "D"
} (tied to Tie::StdHash)

Tie::StdHash  {
    public methods (9) : CLEAR, DELETE, EXISTS, FETCH, FIRSTKEY, NEXTKEY, SCALAR, STORE, TIEHASH
    private methods (0)
    internals: {
        a   "A",
        b   "B",
        c   "C",
        d   "D"
    }
}

JWT refresh token flow

Below are the steps to do revoke your JWT access token:

  1. When you do log in, send 2 tokens (Access token, Refresh token) in response to the client.
  2. The access token will have less expiry time and Refresh will have long expiry time.
  3. The client (Front end) will store refresh token in his local storage and access token in cookies.
  4. The client will use an access token for calling APIs. But when it expires, pick the refresh token from local storage and call auth server API to get the new token.
  5. Your auth server will have an API exposed which will accept refresh token and checks for its validity and return a new access token.
  6. Once the refresh token is expired, the User will be logged out.

Please let me know if you need more details, I can share the code (Java + Spring boot) as well.

For your questions:

Q1: It's another JWT with fewer claims put in with long expiry time.

Q2: It won't be in a database. The backend will not store anywhere. They will just decrypt the token with private/public key and validate it with its expiry time also.

Q3: Yes, Correct

Javascript querySelector vs. getElementById

"Better" is subjective.

querySelector is the newer feature.

getElementById is better supported than querySelector.

querySelector is better supported than getElementsByClassName.

querySelector lets you find elements with rules that can't be expressed with getElementById and getElementsByClassName

You need to pick the appropriate tool for any given task.

(In the above, for querySelector read querySelector / querySelectorAll).

JSON post to Spring Controller

Try to using application/* instead. And use JSON.maybeJson() to check the data structure in the controller.

Force unmount of NFS-mounted directory

Couldn't find a working answer here; but on linux you can run "umount.nfs4 /volume -f" and it definitely unmounts it.

How to put a Scanner input into an array... for example a couple of numbers

import java.util.Scanner;
public class sort {

  public static void main(String args[])
    {
        int i,n,t;          

        Scanner sc=new Scanner(System.in);

        System.out.print("Enter the size of array");

        n=sc.nextInt();

        int a[] = new int[n];

        System.out.println("Enter elements in array");

        for(i=0;i<n;i++)
        {
            a[i]=sc.nextInt();
        }
        t=a[1];

        for(i=0;i<n;i++)
        {
            if(a[i]>t)

                t=a[i];
        }
        System.out.println("Greates integer is" +t);
    }
}

HTML embedded PDF iframe

Try this out.

_x000D_
_x000D_
<iframe src="https://docs.google.com/viewerng/viewer?url=http://infolab.stanford.edu/pub/papers/google.pdf&embedded=true" frameborder="0" height="100%" width="100%">_x000D_
</iframe>
_x000D_
_x000D_
_x000D_

How to tell if string starts with a number with Python?

You can also use try...except:

try:
    int(string[0])
    # do your stuff
except:
    pass # or do your stuff

Caused by: java.security.UnrecoverableKeyException: Cannot recover key

I had the same error when we imported a key into a keystore that was build using a 64bit OpenSSL Version. When we followed the same procedure to import the key into a keystore that was build using a 32 bit OpenSSL version everything went fine.

How can you get the Manifest Version number from the App's (Layout) XML variables?

Easiest solution is to use BuildConfig.

I use BuildConfig.VERSION_NAME in my application.

You can also use BuildConfig.VERSION_CODE to get version code.

Get GMT Time in Java

After java 8, you may want to get the formatted time as below:

DateTimeFormatter.ofPattern("HH:mm:ss.SSS").format(LocalTime.now(ZoneId.of("GMT")));

How to make MySQL handle UTF-8 properly

The charset is a property of the database (default) and the table. You can have a look (MySQL commands):

show create database foo; 
> CREATE DATABASE  `foo`.`foo` /*!40100 DEFAULT CHARACTER SET latin1 */

show create table foo.bar;
> lots of stuff ending with
> ) ENGINE=InnoDB AUTO_INCREMENT=252 DEFAULT CHARSET=latin1

In other words; it's quite easy to check your database charset or change it:

ALTER TABLE `foo`.`bar` CHARACTER SET utf8;

How to pass all arguments passed to my bash script to a function of mine?

Here's a simple script:

#!/bin/bash

args=("$@")

echo Number of arguments: $#
echo 1st argument: ${args[0]}
echo 2nd argument: ${args[1]}

$# is the number of arguments received by the script. I find easier to access them using an array: the args=("$@") line puts all the arguments in the args array. To access them use ${args[index]}.

Git - Ignore files during merge

I ended up finding git attributes. Trying it. Working so far. Did not check all scenarios yet. But it should be the solution.

Merge Strategies - Git attributes

Django template how to look up a dictionary value with a variable

Environment: Django 2.2

  1. Example code:


    from django.template.defaulttags import register

    @register.filter(name='lookup')
    def lookup(value, arg):
        return value.get(arg)

I put this code in a file named template_filters.py in my project folder named portfoliomgr

  1. No matter where you put your filter code, make sure you have __init__.py in that folder

  2. Add that file to libraries section in templates section in your projectfolder/settings.py file. For me, it is portfoliomgr/settings.py



    TEMPLATES = [
        {
            'BACKEND': 'django.template.backends.django.DjangoTemplates',
            'DIRS': [os.path.join(BASE_DIR, 'templates')],
            'APP_DIRS': True,
            'OPTIONS': {
                'context_processors': [
                    'django.template.context_processors.debug',
                    'django.template.context_processors.request',
                    'django.contrib.auth.context_processors.auth',
                    'django.contrib.messages.context_processors.messages',
                ],
                'libraries':{
                    'template_filters': 'portfoliomgr.template_filters',
                }
            },
        },
    ]

  1. In your html code load the library

    
    {% load template_filters %}
    

Inputting a default image in case the src attribute of an html <img> is not valid?

For any image, just use this javascript code:

if (ptImage.naturalWidth == 0)
    ptImage.src = '../../../../icons/blank.png';

where ptImage is a <img> tag address obtained by document.getElementById().

How, in general, does Node.js handle 10,000 concurrent requests?

Adding to slebetman answer: When you say Node.JS can handle 10,000 concurrent requests they are essentially non-blocking requests i.e. these requests are majorly pertaining to database query.

Internally, event loop of Node.JS is handling a thread pool, where each thread handles a non-blocking request and event loop continues to listen to more request after delegating work to one of the thread of the thread pool. When one of the thread completes the work, it send a signal to the event loop that it has finished aka callback. Event loop then process this callback and send the response back.

As you are new to NodeJS, do read more about nextTick to understand how event loop works internally. Read blogs on http://javascriptissexy.com, they were really helpful for me when I started with JavaScript/NodeJS.

Catching access violation exceptions?

A violation like that means that there's something seriously wrong with the code, and it's unreliable. I can see that a program might want to try to save the user's data in a way that one hopes won't write over previous data, in the hope that the user's data isn't already corrupted, but there is by definition no standard method of dealing with undefined behavior.

CSS Transition doesn't work with top, bottom, left, right

Perhaps you need to specify a top value in your css rule set, so that it will know what value to animate from.

How to upload (FTP) files to server in a bash script?

Working Example to Put Your File on Root ...........see its very simple

#!/bin/sh
HOST='ftp.users.qwest.net'
USER='yourid'
PASSWD='yourpw'
FILE='file.txt'

ftp -n $HOST <<END_SCRIPT
quote USER $USER
quote PASS $PASSWD
put $FILE
quit
END_SCRIPT
exit 0

GridLayout and Row/Column Span Woe

You have to set both layout_gravity and layout_columntWeight on your columns

<android.support.v7.widget.GridLayout
    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="wrap_content">

    <TextView android:text="??? ???"
        app:layout_gravity="fill_horizontal"
        app:layout_columnWeight="1"
        />

    <TextView android:text="??? ???"
        app:layout_gravity="fill_horizontal"
        app:layout_columnWeight="1"
        />

    <TextView android:text="??? ???"
        app:layout_gravity="fill_horizontal"
        app:layout_columnWeight="1"
        />
 </android.support.v7.widget.GridLayout>

How to develop Android app completely using python?

You could try BeeWare - as described on their website:

Write your apps in Python and release them on iOS, Android, Windows, MacOS, Linux, Web, and tvOS using rich, native user interfaces. One codebase. Multiple apps.

Gives you want you want now to write Android Apps in Python, plus has the advantage that you won't need to learn yet another framework in future if you end up also wanting to do something on one of the other listed platforms.

Here's the Tutorial for Android Apps.

Hibernate vs JPA vs JDO - pros and cons of each?

I made a sample WebApp in May 2012 that uses JDO 3.0 & DataNucleus 3.0 - take a look how clean it is: https://github.com/TorbenVesterager/BadAssWebApp

Okay maybe it's a little bit too clean, because I use the POJOs both for the database and the JSON client, but it's fun :)

PS: Contains a few SuppressWarnings annotations (developed in IntelliJ 11)

How to split a string into an array of characters in Python?

You take the string and pass it to list()

s = "mystring"
l = list(s)
print l

matplotlib.pyplot will not forget previous plots - how can I flush/refresh?

I would rather use plt.clf() after every plt.show() to just clear the current figure instead of closing and reopening it, keeping the window size and giving you a better performance and much better memory usage.

Similarly, you could do plt.cla() to just clear the current axes.

To clear a specific axes, useful when you have multiple axes within one figure, you could do for example:

fig, axes = plt.subplots(nrows=2, ncols=2)

axes[0, 1].clear()

const vs constexpr on variables

constexpr indicates a value that's constant and known during compilation.
const indicates a value that's only constant; it's not compulsory to know during compilation.

int sz;
constexpr auto arraySize1 = sz;    // error! sz's value unknown at compilation
std::array<int, sz> data1;         // error! same problem

constexpr auto arraySize2 = 10;    // fine, 10 is a compile-time constant
std::array<int, arraySize2> data2; // fine, arraySize2 is constexpr

Note that const doesn’t offer the same guarantee as constexpr, because const objects need not be initialized with values known during compilation.

int sz;
const auto arraySize = sz;       // fine, arraySize is const copy of sz
std::array<int, arraySize> data; // error! arraySize's value unknown at compilation

All constexpr objects are const, but not all const objects are constexpr.

If you want compilers to guarantee that a variable has a value that can be used in contexts requiring compile-time constants, the tool to reach for is constexpr, not const.

Why would one mark local variables and method parameters as "final" in Java?

We do it here for the local variables if we think they will not be reassigned or should not be reassigned.

The parameters are not final since we have a Checkstyle-Check which checks for reassigning parameters. Of course nobody would ever want to reassign a parameter variable.

datatable jquery - table header width not aligned with body width

I fixed, Work for me.

var table = $('#example').DataTable();
$('#container').css( 'display', 'block' );
table.columns.adjust().draw();

Or

var table = $('#example').DataTable();
table.columns.adjust().draw();

Reference: https://datatables.net/reference/api/columns.adjust()

Accessing nested JavaScript objects and arrays by string path

What about this solution:

setJsonValue: function (json, field, val) {
  if (field !== undefined){
    try {
      eval("json." + field + " = val");
    }
    catch(e){
      ;
    }
  }  
}

And this one, for getting:

getJsonValue: function (json, field){
  var value = undefined;
  if (field !== undefined) {
    try {
      eval("value = json." + field);
    } 
    catch(e){
      ;
    }
  }
  return value;
};

Probably some will consider them unsafe, but they must be much faster then, parsing the string.

Call japplet from jframe

First of all, Applets are designed to be run from within the context of a browser (or applet viewer), they're not really designed to be added into other containers.

Technically, you can add a applet to a frame like any other component, but personally, I wouldn't. The applet is expecting a lot more information to be available to it in order to allow it to work fully.

Instead, I would move all of the "application" content to a separate component, like a JPanel for example and simply move this between the applet or frame as required...

ps- You can use f.setLocationRelativeTo(null) to center the window on the screen ;)

Updated

You need to go back to basics. Unless you absolutely must have one, avoid applets until you understand the basics of Swing, case in point...

Within the constructor of GalzyTable2 you are doing...

JApplet app = new JApplet(); add(app); app.init(); app.start(); 

...Why are you adding another applet to an applet??

Case in point...

Within the main method, you are trying to add the instance of JFrame to itself...

f.getContentPane().add(f, button2); 

Instead, create yourself a class that extends from something like JPanel, add your UI logical to this, using compound components if required.

Then, add this panel to whatever top level container you need.

Take the time to read through Creating a GUI with Swing

Updated with example

import java.awt.BorderLayout; import java.awt.Dimension; import java.awt.EventQueue; import java.awt.event.ActionEvent; import javax.swing.ImageIcon; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTable; import javax.swing.UIManager; import javax.swing.UnsupportedLookAndFeelException;  public class GalaxyTable2 extends JPanel {      private static final int PREF_W = 700;     private static final int PREF_H = 600;      String[] columnNames                     = {"Phone Name", "Brief Description", "Picture", "price",                         "Buy"};  // Create image icons     ImageIcon Image1 = new ImageIcon(                     getClass().getResource("s1.png"));     ImageIcon Image2 = new ImageIcon(                     getClass().getResource("s2.png"));     ImageIcon Image3 = new ImageIcon(                     getClass().getResource("s3.png"));     ImageIcon Image4 = new ImageIcon(                     getClass().getResource("s4.png"));     ImageIcon Image5 = new ImageIcon(                     getClass().getResource("note.png"));     ImageIcon Image6 = new ImageIcon(                     getClass().getResource("note2.png"));     ImageIcon Image7 = new ImageIcon(                     getClass().getResource("note3.png"));      Object[][] rowData = {         {"Galaxy S", "3G Support,CPU 1GHz",             Image1, 120, false},         {"Galaxy S II", "3G Support,CPU 1.2GHz",             Image2, 170, false},         {"Galaxy S III", "3G Support,CPU 1.4GHz",             Image3, 205, false},         {"Galaxy S4", "4G Support,CPU 1.6GHz",             Image4, 230, false},         {"Galaxy Note", "4G Support,CPU 1.4GHz",             Image5, 190, false},         {"Galaxy Note2 II", "4G Support,CPU 1.6GHz",             Image6, 190, false},         {"Galaxy Note 3", "4G Support,CPU 2.3GHz",             Image7, 260, false},};      MyTable ss = new MyTable(                     rowData, columnNames);      // Create a table     JTable jTable1 = new JTable(ss);      public GalaxyTable2() {         jTable1.setRowHeight(70);          add(new JScrollPane(jTable1),                         BorderLayout.CENTER);          JPanel buttons = new JPanel();          JButton button = new JButton("Home");         buttons.add(button);         JButton button2 = new JButton("Confirm");         buttons.add(button2);          add(buttons, BorderLayout.SOUTH);     }      @Override      public Dimension getPreferredSize() {         return new Dimension(PREF_W, PREF_H);     }      public void actionPerformed(ActionEvent e) {         new AMainFrame7().setVisible(true);     }      public static void main(String[] args) {          EventQueue.invokeLater(new Runnable() {             @Override             public void run() {                 try {                     UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());                 } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {                     ex.printStackTrace();                 }                  JFrame frame = new JFrame("Testing");                 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);                 frame.add(new GalaxyTable2());                 frame.pack();                 frame.setLocationRelativeTo(null);                 frame.setVisible(true);             }         });     } } 

You also seem to have a lack of understanding about how to use layout managers.

Take the time to read through Creating a GUI with Swing and Laying components out in a container

PHPExcel - set cell type before writing a value in it

For Numbers with leading zeroes and comma separated:

You can put 'A' to affect the entire column'.

$objPHPExcel->getActiveSheet()->getStyle('A1')->getNumberFormat()->setFormatCode(PHPExcel_Style_NumberFormat::FORMAT_NUMBER_COMMA_SEPARATED1);

Then you can write to the cell as you normally would.

What should my Objective-C singleton look like?

I know there are a lot of comments on this "question", but I don't see many people suggesting using a macro to define the singleton. It's such a common pattern and a macro greatly simplifies the singleton.

Here are the macros I wrote based on several Objc implementations I've seen.

Singeton.h

/**
 @abstract  Helps define the interface of a singleton.
 @param  TYPE  The type of this singleton.
 @param  NAME  The name of the singleton accessor.  Must match the name used in the implementation.
 @discussion
 Typcially the NAME is something like 'sharedThing' where 'Thing' is the prefix-removed type name of the class.
 */
#define SingletonInterface(TYPE, NAME) \
+ (TYPE *)NAME;


/**
 @abstract  Helps define the implementation of a singleton.
 @param  TYPE  The type of this singleton.
 @param  NAME  The name of the singleton accessor.  Must match the name used in the interface.
 @discussion
 Typcially the NAME is something like 'sharedThing' where 'Thing' is the prefix-removed type name of the class.
 */
#define SingletonImplementation(TYPE, NAME) \
static TYPE *__ ## NAME; \
\
\
+ (void)initialize \
{ \
    static BOOL initialized = NO; \
    if(!initialized) \
    { \
        initialized = YES; \
        __ ## NAME = [[TYPE alloc] init]; \
    } \
} \
\
\
+ (TYPE *)NAME \
{ \
    return __ ## NAME; \
}

Example of use:

MyManager.h

@interface MyManager

SingletonInterface(MyManager, sharedManager);

// ...

@end

MyManager.m

@implementation MyManager

- (id)init
{
    self = [super init];
    if (self) {
        // Initialization code here.
    }

    return self;
}

SingletonImplementation(MyManager, sharedManager);

// ...

@end

Why a interface macro when it's nearly empty? Code consistency between the header and code files; maintainability in case you want to add more automatic methods or change it around.

I'm using the initialize method to create the singleton as is used in the most popular answer here (at time of writing).

How can I check the syntax of Python script without executing it?

You can check the syntax by compiling it:

python -m py_compile script.py

CSS: stretching background image to 100% width and height of screen?

You need to set the height of html to 100%

body {
    background-image:url("../images/myImage.jpg");
    background-repeat: no-repeat;
    background-size: 100% 100%;
}
html {
    height: 100%
}

http://jsfiddle.net/8XUjP/

Running an Excel macro via Python?

Just a quick note with a xlsm with spaces.

file = 'file with spaces.xlsm'
excel_macro.Application.Run('\'' + file + '\'' + "!Module1.Macro1")

Submit form on pressing Enter with AngularJS

Will be slightly neater using a CSS class instead of repeating inline styles.

CSS

input[type=submit] {
    position: absolute;
    left: -9999px;
}

HTML

<form ng-submit="myFunc()">
    <input type="text" ng-model="name" />
    <br />
    <input type="text" ng-model="email" />
    <input type="submit" />
</form>

How to delete Project from Google Developers Console

Go to Google Cloud Console, select the project then IAM and Admin and Settings

enter image description here

now SHUT DOWN

enter image description here

Then you have to wait for the project deletion.

enter image description here

enter image description here

Convert Uppercase Letter to Lowercase and First Uppercase in Sentence using CSS

can simply use style inside element

<p style="text-transform: lowercase;">HI I AM NEW HERE</p>

How to deserialize a list using GSON or another JSON library in Java?

Another way is to use an array as a type, e.g.:

Video[] videoArray = gson.fromJson(json, Video[].class);

This way you avoid all the hassle with the Type object, and if you really need a list you can always convert the array to a list, e.g.:

List<Video> videoList = Arrays.asList(videoArray);

IMHO this is much more readable.


In Kotlin this looks like this:

Gson().fromJson(jsonString, Array<Video>::class.java)

To convert this array into List, just use .toList() method

Objective-C : BOOL vs bool

Also, be aware of differences in casting, especially when working with bitmasks, due to casting to signed char:

bool a = 0x0100;
a == true;  // expression true

BOOL b = 0x0100;
b == false; // expression true on !((TARGET_OS_IPHONE && __LP64__) || TARGET_OS_WATCH), e.g. MacOS
b == true;  // expression true on (TARGET_OS_IPHONE && __LP64__) || TARGET_OS_WATCH

If BOOL is a signed char instead of a bool, the cast of 0x0100 to BOOL simply drops the set bit, and the resulting value is 0.

Java double comparison epsilon

Whoa whoa whoa. Is there a specific reason you're using floating-point for currency, or would things be better off with an arbitrary-precision, fixed-point number format? I have no idea what the specific problem that you're trying to solve is, but you should think about whether or not half a cent is really something you want to work with, or if it's just an artifact of using an imprecise number format.

rake assets:precompile RAILS_ENV=production not working as required

I had this problem today. I fixed it being being explict about my require

gem 'uglifier', '>= 1.0.3', require: 'uglifier'

I had mine still in the assets group.

How to make a text box have rounded corners?

This can be done with CSS3:

<input type="text" />

input
{
  -moz-border-radius: 15px;
 border-radius: 15px;
    border:solid 1px black;
    padding:5px;
}

http://jsfiddle.net/UbSkn/1/


However, an alternative would be to put the input inside a div with a rounded background, and no border on the input

to_string is not a member of std, says g++ (mingw)

This is a known bug under MinGW. Relevant Bugzilla. In the comments section you can get a patch to make it work with MinGW.

This issue has been fixed in MinGW-w64 distros higher than GCC 4.8.0 provided by the MinGW-w64 project. Despite the name, the project provides toolchains for 32-bit along with 64-bit. The Nuwen MinGW distro also solves this issue.

How do I create a list of random numbers without duplicates?

to sample integers without replacement between minval and maxval:

import numpy as np

minval, maxval, n_samples = -50, 50, 10
generator = np.random.default_rng(seed=0)
samples = generator.permutation(np.arange(minval, maxval))[:n_samples]

# or, if minval is 0,
samples = generator.permutation(maxval)[:n_samples]

with jax:

import jax

minval, maxval, n_samples = -50, 50, 10
key = jax.random.PRNGKey(seed=0)
samples = jax.random.shuffle(key, jax.numpy.arange(minval, maxval))[:n_samples]

Why "net use * /delete" does not work but waits for confirmation in my PowerShell script?

With PowerShell 5.1 in Windows 10 you can use:

Get-SmbMapping | Remove-SmbMapping -Confirm:$false

How to convert signed to unsigned integer in python

Python doesn't have builtin unsigned types. You can use mathematical operations to compute a new int representing the value you would get in C, but there is no "unsigned value" of a Python int. The Python int is an abstraction of an integer value, not a direct access to a fixed-byte-size integer.

What is the difference between pip and conda?

Quoting from Conda: Myths and Misconceptions (a comprehensive description):

...

Myth #3: Conda and pip are direct competitors

Reality: Conda and pip serve different purposes, and only directly compete in a small subset of tasks: namely installing Python packages in isolated environments.

Pip, which stands for Pip Installs Packages, is Python's officially-sanctioned package manager, and is most commonly used to install packages published on the Python Package Index (PyPI). Both pip and PyPI are governed and supported by the Python Packaging Authority (PyPA).

In short, pip is a general-purpose manager for Python packages; conda is a language-agnostic cross-platform environment manager. For the user, the most salient distinction is probably this: pip installs python packages within any environment; conda installs any package within conda environments. If all you are doing is installing Python packages within an isolated environment, conda and pip+virtualenv are mostly interchangeable, modulo some difference in dependency handling and package availability. By isolated environment I mean a conda-env or virtualenv, in which you can install packages without modifying your system Python installation.

Even setting aside Myth #2, if we focus on just installation of Python packages, conda and pip serve different audiences and different purposes. If you want to, say, manage Python packages within an existing system Python installation, conda can't help you: by design, it can only install packages within conda environments. If you want to, say, work with the many Python packages which rely on external dependencies (NumPy, SciPy, and Matplotlib are common examples), while tracking those dependencies in a meaningful way, pip can't help you: by design, it manages Python packages and only Python packages.

Conda and pip are not competitors, but rather tools focused on different groups of users and patterns of use.

How to convert char to integer in C?

The standard function atoi() will likely do what you want.

A simple example using "atoi":

#include <unistd.h>

int main(int argc, char *argv[])
{
    int useconds = atoi(argv[1]); 
    usleep(useconds);
}

Spring Boot: How can I set the logging level with application.properties?

in spring boot project we can write logging.level.root=WARN but here problem is, we have to restart again even we added devtools dependency, in property file if we are modified any value will not autodetectable, for this limitation i came to know the solution i,e we can add actuator in pom.xml and pass the logger level as below shown in postman client in url bar http://localhost:8080/loggers/ROOT or http://localhost:8080/loggers/com.mycompany and in the body you can pass the json format like below

{
  "configuredLevel": "WARN"
}

Showing line numbers in IPython/Jupyter Notebooks

1.press esc to enter the command mode 2.perss l(it L in lowcase) to show the line number

Could not load file or assembly System.Web.Http.WebHost after published to Azure web site

The dll is missing in the published (deployed environment). That is the reason why it is working in the local i.e. Visual Studio but not in the Azure Website Environment.

Just do Copy Local = true in the properties for the assembly(System.Web.Http.WebHost) and then do a redeploy, it should work fine.

Spring Boot: Cannot access REST Controller on localhost (404)

Place your springbootapplication class in root package for example if your service,controller is in springBoot.xyz package then your main class should be in springBoot package otherwise it will not scan below packages

Get current time in seconds since the Epoch on Linux, Bash

use this bash script (my ~/bin/epoch):

#!/bin/bash

# get seconds since epoch
test "x$1" == x && date +%s && exit 0

# or convert epoch seconds to date format (see "man date" for options)
EPOCH="$1"
shift
date -d @"$EPOCH" "$@"

Transparent ARGB hex value

Just came across this and the short code for transparency is simply #00000000.

How to pass boolean parameter value in pipeline to downstream jobs?

Jenkins "boolean" parameters are really just a shortcut for the "choice parameter" type with the choices hardcoded to the strings "true" and "false", and with a checkbox to set the string variable. But in the end, it is just that: a string variable, with nothing to do with a true boolean. That's why you need to convert the string to a boolean if you don't want to do a string comparison like:

if (myBoolean == "true")

Convert List<DerivedClass> to List<BaseClass>

The way to make this work is to iterate over the list and cast the elements. This can be done using ConvertAll:

List<A> listOfA = new List<C>().ConvertAll(x => (A)x);

You could also use Linq:

List<A> listOfA = new List<C>().Cast<A>().ToList();

Passing Variable through JavaScript from one html page to another page

There are two pages: Pageone.html :

<script>
var hello = "hi"
location.replace("http://example.com/PageTwo.html?" + hi + "");
</script>

PageTwo.html :

<script>
var link = window.location.href;
link = link.replace("http://example.com/PageTwo.html?","");
document.write("The variable contained this content:" + link + "");
</script>

Hope it helps!

How can I read an input string of unknown length?

I've seen only one simple way of reading an arbitrarily long string, but I've never used it. I think it goes like this:

char *m = NULL;
printf("please input a string\n");
scanf("%ms",&m);
if (m == NULL)
    fprintf(stderr, "That string was too long!\n");
else
{
    printf("this is the string %s\n",m);
    /* ... any other use of m */
    free(m);
}

The m between % and s tells scanf() to measure the string and allocate memory for it and copy the string into that, and to store the address of that allocated memory in the corresponding argument. Once you're done with it you have to free() it.

This isn't supported on every implementation of scanf(), though.

As others have pointed out, the easiest solution is to set a limit on the length of the input. If you still want to use scanf() then you can do so this way:

char m[100];
scanf("%99s",&m);

Note that the size of m[] must be at least one byte larger than the number between % and s.

If the string entered is longer than 99, then the remaining characters will wait to be read by another call or by the rest of the format string passed to scanf().

Generally scanf() is not recommended for handling user input. It's best applied to basic structured text files that were created by another application. Even then, you must be aware that the input might not be formatted as you expect, as somebody might have interfered with it to try to break your program.

nginx - client_max_body_size has no effect

Following nginx documentation, you can set client_max_body_size 20m ( or any value you need ) in the following context:

context: http, server, location

How to vertically center a container in Bootstrap?

My prefered technique :

body {
  display: table;
  position: absolute;
  height: 100%;
  width: 100%;
}

.jumbotron {
   display: table-cell;
   vertical-align: middle;
}

Demo

_x000D_
_x000D_
body {_x000D_
  display: table;_x000D_
  position: absolute;_x000D_
  height: 100%;_x000D_
  width: 100%;_x000D_
}_x000D_
_x000D_
.jumbotron {_x000D_
   display: table-cell;_x000D_
   vertical-align: middle;_x000D_
}
_x000D_
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">_x000D_
<div class="jumbotron vertical-center">_x000D_
  <div class="container text-center">_x000D_
    <h1>The easiest and powerful way</h1>_x000D_
    <div class="row">_x000D_
      <div class="col-md-7">_x000D_
        <div class="top-bg">Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</div>_x000D_
      </div>_x000D_
_x000D_
      <div class="col-md-5 iPhone-features">_x000D_
        <ul class="top-features">_x000D_
          <li>_x000D_
            <span><i class="fa fa-random simple_bg top-features-bg"></i></span>_x000D_
            <p><strong>Redirect</strong><br>Visitors where they converts more.</p>_x000D_
          </li>_x000D_
          <li>_x000D_
            <span><i class="fa fa-cogs simple_bg top-features-bg"></i></span>_x000D_
            <p><strong>Track</strong><br>Views, Clicks and Conversions.</p>_x000D_
          </li>_x000D_
          <li>_x000D_
            <span><i class="fa fa-check simple_bg top-features-bg"></i></span>_x000D_
            <p><strong>Check</strong><br>Constantly the status of your links.</p>_x000D_
          </li>_x000D_
          <li>_x000D_
            <span><i class="fa fa-users simple_bg top-features-bg"></i></span>_x000D_
            <p><strong>Collaborate</strong><br>With Customers, Partners and Co-Workers.</p>_x000D_
          </li>_x000D_
          <a href="pricing-and-signup.html" class="btn-primary btn h2 lightBlue get-Started-btn">GET STARTED</a>_x000D_
          <h6 class="get-Started-sub-btn">FREE VERSION AVAILABLE!</h6>_x000D_
        </ul>_x000D_
      </div>_x000D_
    </div>_x000D_
  </div>_x000D_
</div>
_x000D_
_x000D_
_x000D_

See also this Fiddle!

Extending from two classes

Like another alternative, maybe you can use an interface with a default implementation of a method. That depends of course of what you want to do.

For example, you can create an abstract class and an interface:

public abstract class FatherClass {

    abstract void methodInherit() {
        //... do something
    }
}

public interface InterfaceWithDefaultsMethods {
    default void anotherMethod() {
        //... do something
        //... maybe a method with a callable for call another function.
    }
}

So, after that, you can extend and implements both classes and use both methods.

public class extends FatherClass implements InterfaceWithDefaultsMethods {

    void methode() {
        methodInherit();
        anotherMethod();
    }
}

Hope this helps you...

How do I 'foreach' through a two-dimensional array?

Remember that a multi-dimensional array is like a table. You don't have an x element and a y element for each entry; you have a string at (for instance) table[1,2].

So, each entry is still only one string (in your example), it's just an entry at a specific x/y value. So, to get both entries at table[1, x], you'd do a nested for loop. Something like the following (not tested, but should be close)

for (int x = 0; x < table.Length; x++)
{
    for (int y = 0; y < table.Length; y += 2)
    {
        Console.WriteLine("{0} {1}", table[x, y], table[x, y + 1]);
    }
}

How to SHUTDOWN Tomcat in Ubuntu?

To stop apache process try this command

ps aux | grep tomcat | awk '{print $2}' | xargs kill -9

How to handle AssertionError in Python and find out which line or statement it occurred on?

Use the traceback module:

import sys
import traceback

try:
    assert True
    assert 7 == 7
    assert 1 == 2
    # many more statements like this
except AssertionError:
    _, _, tb = sys.exc_info()
    traceback.print_tb(tb) # Fixed format
    tb_info = traceback.extract_tb(tb)
    filename, line, func, text = tb_info[-1]

    print('An error occurred on line {} in statement {}'.format(line, text))
    exit(1)

Difference between left join and right join in SQL Server

Table from which you are taking data is 'LEFT'.
Table you are joining is 'RIGHT'.
LEFT JOIN: Take all items from left table AND (only) matching items from right table.
RIGHT JOIN: Take all items from right table AND (only) matching items from left table.
So:

Select * from Table1 left join Table2 on Table1.id = Table2.id  

gives:

Id     Name       
-------------  
1      A          
2      B      

but:

Select * from Table1 right join Table2 on Table1.id = Table2.id

gives:

Id     Name       
-------------  
1      A          
2      B   
3      C  

you were right joining table with less rows on table with more rows
AND
again, left joining table with less rows on table with more rows
Try:

 If Table1.Rows.Count > Table2.Rows.Count Then  
    ' Left Join  
 Else  
    ' Right Join  
 End If  

How to ISO 8601 format a Date with Timezone Offset in JavaScript?

I think it is worth considering that you can get the requested info with just a single API call to the standard library...

new Date().toLocaleString( 'sv', { timeZoneName: 'short' } );

// produces "2019-10-30 15:33:47 GMT-4"

You would have to do text swapping if you want to add the 'T' delimiter, remove the 'GMT-', or append the ':00' to the end.

But then you can easily play with the other options if you want to eg. use 12h time or omit the seconds etc.

Note that I'm using Sweden as locale because it is one of the countries that uses ISO 8601 format. I think most of the ISO countries use this 'GMT-4' format for the timezone offset other then Canada which uses the time zone abbreviation eg. "EDT" for eastern-daylight-time.

You can get the same thing from the newer standard i18n function "Intl.DateTimeFormat()" but you have to tell it to include the time via the options or it will just give date.

Changing ViewPager to enable infinite page scrolling

Actually, I've been looking at the various ways to do this "infinite" pagination, and even though the human notion of time is that it is infinite (even though we have a notion of the beginning and end of time), computers deal in the discrete. There is a minimum and maximum time (that can be adjusted as time goes on, remember the basis of the Y2K scare?).

Anyways, the point of this discussion is that it is/should be sufficient to support a relatively infinite date range through an actually finite date range. A great example of this is the Android framework's CalendarView implementation, and the WeeksAdapter within it. The default minimum date is in 1900 and the default maximum date is in 2100, this should cover 99% of the calendar use of anyone within a 10 year radius around today easily.

What they do in their implementation (focused on weeks) is compute the number of weeks between the minimum and maximum date. This becomes the number of pages in the pager. Remember that the pager doesn't need to maintain all of these pages simultaneously (setOffscreenPageLimit(int)), it just needs to be able to create the page based on the page number (or index/position). In this case the index is the number of weeks that the week is from the minimum date. With this approach you just have to maintain the minimum date and the number of pages (distance to the maximum date), then for any page you can easily compute the week associated with that page. No dancing around the fact that ViewPager doesn't support looping (a.k.a infinite pagination), and trying to force it to behave like it can scroll infinitely.

new FragmentStatePagerAdapter(getFragmentManager()) {
    @Override
    public Fragment getItem(int index) {
        final Bundle arguments = new Bundle(getArguments());
        final Calendar temp_calendar = Calendar.getInstance();
        temp_calendar.setTimeInMillis(_minimum_date.getTimeInMillis());
        temp_calendar.setFirstDayOfWeek(_calendar.getStartOfWeek());
        temp_calendar.add(Calendar.WEEK_OF_YEAR, index);
        // Moves to the first day of this week
        temp_calendar.add(Calendar.DAY_OF_YEAR,
                -UiUtils.modulus(temp_calendar.get(Calendar.DAY_OF_WEEK) - temp_calendar.getFirstDayOfWeek(),
                7));
        arguments.putLong(KEY_DATE, temp_calendar.getTimeInMillis());
        return Fragment.instantiate(getActivity(), WeekDaysFragment.class.getName(), arguments);
    }

    @Override
    public int getCount() {
        return _total_number_of_weeks;
    }
};

Then WeekDaysFragment can easily display the week starting at the date passed in its arguments.

Alternatively, it seems that some version of the Calendar app on Android uses a ViewSwitcher (which means there's only 2 pages, the one you see and the hidden page). It then changes the transition animation based on which way the user swiped and renders the next/previous page accordingly. In this way you get infinite pagination because it just switching between two pages infinitely. This requires using a View for the page though, which is way I went with the first approach.

In general, if you want "infinite pagination", it's probably because your pages are based off of dates or times somehow. If this is the case consider using a finite subset of time that is relatively infinite instead. This is how CalendarView is implemented for example. Or you can use the ViewSwitcher approach. The advantage of these two approaches is that neither does anything particularly unusual with the ViewSwitcher or ViewPager, and doesn't require any tricks or reimplementation to coerce them to behave infinitely (ViewSwitcher is already designed to switch between views infinitely, but ViewPager is designed to work on a finite, but not necessarily constant, set of pages).

The POST method is not supported for this route. Supported methods: GET, HEAD. Laravel

mainly this type of error generate, 1.first check a code, in code, we define @csrf

<form method ="post" action={{url('project'')}}
   @csrf
   ...... 

2.when we define a wrong variable name, that time also happened this type of problem.

ex. if your database field name "xyz" and you use a "wxyz"

3.if our method is wrong in form,so plz check our method. ex. <form method="post">

Adding item to Dictionary within loop

In your current code, what Dictionary.update() does is that it updates (update means the value is overwritten from the value for same key in passed in dictionary) the keys in current dictionary with the values from the dictionary passed in as the parameter to it (adding any new key:value pairs if existing) . A single flat dictionary does not satisfy your requirement , you either need a list of dictionaries or a dictionary with nested dictionaries.

If you want a list of dictionaries (where each element in the list would be a diciotnary of a entry) then you can make case_list as a list and then append case to it (instead of update) .

Example -

case_list = []
for entry in entries_list:
    case = {'key1': entry[0], 'key2': entry[1], 'key3':entry[2] }
    case_list.append(case)

Or you can also have a dictionary of dictionaries with the key of each element in the dictionary being entry1 or entry2 , etc and the value being the corresponding dictionary for that entry.

case_list = {}
for entry in entries_list:
    case = {'key1': value, 'key2': value, 'key3':value }
    case_list[entryname] = case  #you will need to come up with the logic to get the entryname.

Align div with fixed position on the right side

make a parent div, in css make it float:right then make the child div's position fixed this will make the div stay in its position at all times and on the right

How to use nan and inf in C?

I usually use

#define INFINITY (1e999)

or

const double INFINITY = 1e999

which works at least in IEEE 754 contexts because the highest representable double value is roughly 1e308. 1e309 would work just as well, as would 1e99999, but three nines is sufficient and memorable. Since this is either a double literal (in the #define case) or an actual Inf value, it will remain infinite even if you're using 128-bit (“long double”) floats.

Hide axis values but keep axis tick labels in matplotlib

This works great. Just paste this before plt.show():

plt.gca().axes.get_yaxis().set_visible(False)

Boom.

How do I automatically resize an image for a mobile site?

Your css with doesn't have any effect as the outer element doesn't have a width defined (and body is missing as well).

A different approach is to deliver already scaled images. http://www.sencha.com/products/io/ for example delivers the image already scaled down depending on the viewing device.

Using HTML5/JavaScript to generate and save a file

Simple Solution!

_x000D_
_x000D_
<a download="My-FileName.txt" href="data:application/octet-stream,HELLO-WORLDDDDDDDD">Click here</a>
_x000D_
_x000D_
_x000D_

Works in all Modern browsers.

Simple parse JSON from URL on Android and display in listview

You could use AsyncTask, you'll have to customize to fit your needs, but something like the following


Async task has three primary methods:

  1. onPreExecute() - most commonly used for setting up and starting a progress dialog

  2. doInBackground() - Makes connections and receives responses from the server (Do NOT try to assign response values to GUI elements, this is a common mistake, that cannot be done in a background thread).

  3. onPostExecute() - Here we are out of the background thread, so we can do user interface manipulation with the response data, or simply assign the response to specific variable types.

First we will start the class, initialize a String to hold the results outside of the methods but inside the class, then run the onPreExecute() method setting up a simple progress dialog.

class MyAsyncTask extends AsyncTask<String, String, Void> {

    private ProgressDialog progressDialog = new ProgressDialog(MainActivity.this);
    InputStream inputStream = null;
    String result = ""; 

    protected void onPreExecute() {
        progressDialog.setMessage("Downloading your data...");
        progressDialog.show();
        progressDialog.setOnCancelListener(new OnCancelListener() {
            public void onCancel(DialogInterface arg0) {
                MyAsyncTask.this.cancel(true);
            }
        });
    }

Then we need to set up the connection and how we want to handle the response:

    @Override
    protected Void doInBackground(String... params) {

        String url_select = "http://yoururlhere.com";

        ArrayList<NameValuePair> param = new ArrayList<NameValuePair>();

        try {
            // Set up HTTP post

            // HttpClient is more then less deprecated. Need to change to URLConnection
            HttpClient httpClient = new DefaultHttpClient();

            HttpPost httpPost = new HttpPost(url_select);
            httpPost.setEntity(new UrlEncodedFormEntity(param));
            HttpResponse httpResponse = httpClient.execute(httpPost);
            HttpEntity httpEntity = httpResponse.getEntity();

            // Read content & Log
            inputStream = httpEntity.getContent();
        } catch (UnsupportedEncodingException e1) {
            Log.e("UnsupportedEncodingException", e1.toString());
            e1.printStackTrace();
        } catch (ClientProtocolException e2) {
            Log.e("ClientProtocolException", e2.toString());
            e2.printStackTrace();
        } catch (IllegalStateException e3) {
            Log.e("IllegalStateException", e3.toString());
            e3.printStackTrace();
        } catch (IOException e4) {
            Log.e("IOException", e4.toString());
            e4.printStackTrace();
        }
        // Convert response to string using String Builder
        try {
            BufferedReader bReader = new BufferedReader(new InputStreamReader(inputStream, "utf-8"), 8);
            StringBuilder sBuilder = new StringBuilder();

            String line = null;
            while ((line = bReader.readLine()) != null) {
                sBuilder.append(line + "\n");
            }

            inputStream.close();
            result = sBuilder.toString();

        } catch (Exception e) {
            Log.e("StringBuilding & BufferedReader", "Error converting result " + e.toString());
        }
    } // protected Void doInBackground(String... params)

Lastly, here we will parse the return, in this example it was a JSON Array and then dismiss the dialog:

    protected void onPostExecute(Void v) {
        //parse JSON data
        try {
            JSONArray jArray = new JSONArray(result);    
            for(i=0; i < jArray.length(); i++) {

                JSONObject jObject = jArray.getJSONObject(i);

                String name = jObject.getString("name");
                String tab1_text = jObject.getString("tab1_text");
                int active = jObject.getInt("active");

            } // End Loop
            this.progressDialog.dismiss();
        } catch (JSONException e) {
            Log.e("JSONException", "Error: " + e.toString());
        } // catch (JSONException e)
    } // protected void onPostExecute(Void v)
} //class MyAsyncTask extends AsyncTask<String, String, Void>

Center button under form in bootstrap

Try adding this class

class="pager"

<p class="pager" style="line-height: 70px;">
    <button type="submit" class="btn">Confirm</button>
</p>

I tried mine within a <div class=pager><button etc etc></div> which worked well

See http://getbootstrap.com/components/ look under Pagination -> Pager

This looks like the correct bootstrap class to center this, text-align: center; is meant for text not images and blocks etc.

How to clone a Date object?

_x000D_
_x000D_
var orig = new Date();
var copy = new Date(+orig);

console.log(orig, copy);
_x000D_
_x000D_
_x000D_

How to process a file in PowerShell line-by-line as a stream

If you want to use straight PowerShell check out the below code.

$content = Get-Content C:\Users\You\Documents\test.txt
foreach ($line in $content)
{
    Write-Host $line
}

In C#, what is the difference between public, private, protected, and having no access modifier?

I think it is related to good OOP design. If you are a developer of a library you want to hide the inner workings of your library. That way, you can modify your library inner workings later on. So you put your members and helper methods as private, and only interface methods are public. Methods that should be overwritten should be protected.

ImportError: No module named BeautifulSoup

On Ubuntu 14.04 I installed it from apt-get and it worked fine:

sudo apt-get install python-beautifulsoup

Then just do:

from BeautifulSoup import BeautifulSoup

graphing an equation with matplotlib

This is because in line

graph(x**3+2*x-4, range(-10, 11))

x is not defined.

The easiest way is to pass the function you want to plot as a string and use eval to evaluate it as an expression.

So your code with minimal modifications will be

import numpy as np  
import matplotlib.pyplot as plt  
def graph(formula, x_range):  
    x = np.array(x_range)  
    y = eval(formula)
    plt.plot(x, y)  
    plt.show()

and you can call it as

graph('x**3+2*x-4', range(-10, 11))

What is polymorphism, what is it for, and how is it used?

Let's use an analogy. For a given musical script every musician which plays it gives her own touch in the interpretation.

Musician can be abstracted with interfaces, genre to which musician belongs can be an abstrac class which defines some global rules of interpretation and every musician who plays can be modeled with a concrete class.

If you are a listener of the musical work, you have a reference to the script e.g. Bach's 'Fuga and Tocata' and every musician who performs it does it polymorphicaly in her own way.

This is just an example of a possible design (in Java):

public interface Musician {
  public void play(Work work);
}

public interface Work {
  public String getScript();
}

public class FugaAndToccata implements Work {
  public String getScript() {
    return Bach.getFugaAndToccataScript();
  }
}

public class AnnHalloway implements Musician {
  public void play(Work work) {
    // plays in her own style, strict, disciplined
    String script = work.getScript()
  }
}

public class VictorBorga implements Musician {
  public void play(Work work) {
    // goofing while playing with superb style
    String script = work.getScript()
  }
}

public class Listener {
  public void main(String[] args) {
    Musician musician;
    if (args!=null && args.length > 0 && args[0].equals("C")) {
      musician = new AnnHalloway();
    } else {
      musician = new TerryGilliam();
    }
    musician.play(new FugaAndToccata());
}

How to pass multiple values to single parameter in stored procedure

Either use a User Defined Table

Or you can use CSV by defining your own CSV function as per This Post.

I'd probably recommend the second method, as your stored proc is already written in the correct format and you'll find it handy later on if you need to do this down the road.

Cheers!

pandas create new column based on values from other columns / apply a function of multiple columns, row-wise

OK, two steps to this - first is to write a function that does the translation you want - I've put an example together based on your pseudo-code:

def label_race (row):
   if row['eri_hispanic'] == 1 :
      return 'Hispanic'
   if row['eri_afr_amer'] + row['eri_asian'] + row['eri_hawaiian'] + row['eri_nat_amer'] + row['eri_white'] > 1 :
      return 'Two Or More'
   if row['eri_nat_amer'] == 1 :
      return 'A/I AK Native'
   if row['eri_asian'] == 1:
      return 'Asian'
   if row['eri_afr_amer']  == 1:
      return 'Black/AA'
   if row['eri_hawaiian'] == 1:
      return 'Haw/Pac Isl.'
   if row['eri_white'] == 1:
      return 'White'
   return 'Other'

You may want to go over this, but it seems to do the trick - notice that the parameter going into the function is considered to be a Series object labelled "row".

Next, use the apply function in pandas to apply the function - e.g.

df.apply (lambda row: label_race(row), axis=1)

Note the axis=1 specifier, that means that the application is done at a row, rather than a column level. The results are here:

0           White
1        Hispanic
2           White
3           White
4           Other
5           White
6     Two Or More
7           White
8    Haw/Pac Isl.
9           White

If you're happy with those results, then run it again, saving the results into a new column in your original dataframe.

df['race_label'] = df.apply (lambda row: label_race(row), axis=1)

The resultant dataframe looks like this (scroll to the right to see the new column):

      lname   fname rno_cd  eri_afr_amer  eri_asian  eri_hawaiian   eri_hispanic  eri_nat_amer  eri_white rno_defined    race_label
0      MOST    JEFF      E             0          0             0              0             0          1       White         White
1    CRUISE     TOM      E             0          0             0              1             0          0       White      Hispanic
2      DEPP  JOHNNY    NaN             0          0             0              0             0          1     Unknown         White
3     DICAP     LEO    NaN             0          0             0              0             0          1     Unknown         White
4    BRANDO  MARLON      E             0          0             0              0             0          0       White         Other
5     HANKS     TOM    NaN             0          0             0              0             0          1     Unknown         White
6    DENIRO  ROBERT      E             0          1             0              0             0          1       White   Two Or More
7    PACINO      AL      E             0          0             0              0             0          1       White         White
8  WILLIAMS   ROBIN      E             0          0             1              0             0          0       White  Haw/Pac Isl.
9  EASTWOOD   CLINT      E             0          0             0              0             0          1       White         White

How to set cellpadding and cellspacing in table with CSS?

Use padding on the cells and border-spacing on the table. The former will give you cellpadding while the latter will give you cellspacing.

table { border-spacing: 5px; } /* cellspacing */

th, td { padding: 5px; } /* cellpadding */

jsFiddle Demo

Sorting Python list based on the length of the string

I can do it using below two methods, using function

def lensort(x):
    list1 = []
    for i in x:
        list1.append([len(i),i])
    return sorted(list1)

lista = ['a', 'bb', 'ccc', 'dddd']
a=lensort(lista)
print([l[1] for l in a])

In one Liner using Lambda, as below, a already answered above.

 lista = ['a', 'bb', 'ccc', 'dddd']
 lista.sort(key = lambda x:len(x))
 print(lista)

IE7 Z-Index Layering Issues

In IE6 in general, certain UI-elements are implemented with native controls. These controls are rendered in a completely separate phase (window?) and always appear above any other controls, regardless of z-index. Select-boxes are another such problematic control.

The only way to work-around this issue is to construct content which IE renders as a seperate "window" - i.e. you can place a selectbox over a textbox, or, more usefully, an iframe.

In short, you'll need to put "on-hover" like things such as menu's in an iframe in order to let IE place these above built-in UI controls.

This should have been fixed in IE7 (see http://blogs.msdn.com/ie/archive/2006/01/17/514076.aspx) but perhaps you're running in some kind of compatibility mode?

jQuery toggle CSS?

You can do by maintaining the state as below:

$('#user_button').on('click',function(){
    if($(this).attr('data-click-state') == 1) {
        $(this).attr('data-click-state', 0);
        $(this).css('background-color', 'red')
      }
    else {
      $(this).attr('data-click-state', 1);
      $(this).css('background-color', 'orange')
    }
  });

Take a reference from hear codepen example

VC++ fatal error LNK1168: cannot open filename.exe for writing

Enable “Application Experience” service. Launch a console window and type net start AeLookupSvc

How can I make content appear beneath a fixed DIV element?

#nav{
    position: -webkit-sticky; /* Safari */
    position: sticky;
    top: 0;
    margin: 0 auto;
    z-index: 9999;
    background-color: white;
}

[INSTALL_FAILED_NO_MATCHING_ABIS: Failed to extract native libraries, res=-113]

If you got this error when working with your flutter project, you can add the following code in the module build.gradle and within Android block and then in the defaultConfig block. This error happened when I was trying to make a flutter apk build.

android{
    ...
    defaultConfig{
        ...
        //Add this ndk block of code to your build.gradle
        ndk {
            abiFilters 'armeabi-v7a', 'x86', 'armeabi'
        }
    }
}

Select records from NOW() -1 Day

You're almost there: it's NOW() - INTERVAL 1 DAY

How can I convert string to double in C++?

If it is a c-string (null-terminated array of type char), you can do something like:

#include <stdlib.h>
char str[] = "3.14159";
double num = atof(str);

If it is a C++ string, just use the c_str() method:

double num = atof( cppstr.c_str() );

atof() will convert the string to a double, returning 0 on failure. The function is documented here: http://www.cplusplus.com/reference/clibrary/cstdlib/atof.html

How to improve Netbeans performance?

Close all the instences you have running. You might not have closed any of them in a while causing them to stack up and run in the background. Therefore causing lag/making the program work slower.

How to unpack an .asar file?

It is possible to upack without node installed using the following 7-Zip plugin:
http://www.tc4shell.com/en/7zip/asar/

Thanks @MayaPosch for mentioning that in this comment.

Oracle SQL query for Date format

if you are using same date format and have select query where date in oracle :

   select count(id) from Table_name where TO_DATE(Column_date)='07-OCT-2015';

To_DATE provided by oracle

Folder structure for a Node.js project

There is a discussion on GitHub because of a question similar to this one: https://gist.github.com/1398757

You can use other projects for guidance, search in GitHub for:

  • ThreeNodes.js - in my opinion, seems to have a specific structure not suitable for every project;
  • lighter - an more simple structure, but lacks a bit of organization;

And finally, in a book (http://shop.oreilly.com/product/0636920025344.do) suggests this structure:

+-- index.html
+-- js/
¦   +-- main.js
¦   +-- models/
¦   +-- views/
¦   +-- collections/
¦   +-- templates/
¦   +-- libs/
¦       +-- backbone/
¦       +-- underscore/
¦       +-- ...
+-- css/
+-- ...

Maven plugins can not be found in IntelliJ

I just delete all my maven plugins stored in .m2\repository\org\apache\maven\plugins, and IntelliJ downloaded all the plugins again a it solve my problem and it worked fine for me!!!

Convert Set to List without creating new List

Java 8 provides the option of using streams and you can get a list from Set<String> setString as:

List<String> stringList = setString.stream().collect(Collectors.toList());

Though the internal implementation as of now provides an instance of ArrayList:

public static <T>
    Collector<T, ?, List<T>> toList() {
        return new CollectorImpl<>((Supplier<List<T>>) ArrayList::new, List::add,
                                   (left, right) -> { left.addAll(right); return left; },
                                   CH_ID);
    }

but JDK does not guarantee it. As mentioned here:

There are no guarantees on the type, mutability, serializability, or thread-safety of the List returned; if more control over the returned List is required, use toCollection(Supplier).

In case you want to be sure always then you can request for an instance specifically as:

List<String> stringArrayList = setString.stream()
                     .collect(Collectors.toCollection(ArrayList::new));

Bash Shell Script - Check for a flag and grab its value

You should read this getopts tutorial.

Example with -a switch that requires an argument :

#!/bin/bash

while getopts ":a:" opt; do
  case $opt in
    a)
      echo "-a was triggered, Parameter: $OPTARG" >&2
      ;;
    \?)
      echo "Invalid option: -$OPTARG" >&2
      exit 1
      ;;
    :)
      echo "Option -$OPTARG requires an argument." >&2
      exit 1
      ;;
  esac
done

Like greybot said(getopt != getopts) :

The external command getopt(1) is never safe to use, unless you know it is GNU getopt, you call it in a GNU-specific way, and you ensure that GETOPT_COMPATIBLE is not in the environment. Use getopts (shell builtin) instead, or simply loop over the positional parameters.

How to query DATETIME field using only date in Microsoft SQL Server?

select * from test 
where date between '03/19/2014' and '03/19/2014 23:59:59'

This is a realy bad answer. For two reasons.

1. What happens with times like 23.59.59.700 etc. There are times larger than 23:59:59 and the next day.

2. The behaviour depends on the datatype. The query behaves differently for datetime/date/datetime2 types.

Testing with 23:59:59.999 makes it even worse because depending on the datetype you get different roundings.

select convert (varchar(40),convert(date      , '2014-03-19 23:59:59.999'))
select convert (varchar(40),convert(datetime  , '2014-03-19 23:59:59.999'))
select convert (varchar(40),convert(datetime2 , '2014-03-19 23:59:59.999'))

-- For date the value is 'chopped'. -- For datetime the value is rounded up to the next date. (Nearest value). -- For datetime2 the value is precise.

Linux shell script for database backup

Here is my mysql backup script for ubuntu in case it helps someone.

#Mysql back up script

start_time="$(date -u +%s)"

now(){
date +%d-%B-%Y_%H-%M-%S
}

ip(){
/sbin/ifconfig eth0 2>/dev/null|awk '/inet addr:/ {print $2}'|sed 's/addr://'
}

filename="`now`".zip
backupfolder=/path/to/any/folder
fullpathbackupfile=$backupfolder/$filename
db_user=xxx
db_password=xxx
db_name=xxx

printf "\n\n"
printf "******************************\n"
printf "Started Automatic Mysql Backup\n"
printf "******************************\n"
printf "TIME: `now`\n"
printf "IP_ADDRESS: `ip` \n"
printf "DB_SERVER_NAME: DB-SERVER-1\n"

printf "%sBACKUP_FILE_PATH $fullpathbackupfile\n"

printf "Starting Mysql Dump \n"

mysqldump -u $db_user -p$db_password $db_name| pv | zip > $fullpathbackupfile

end_time="$(date -u +%s)"

elapsed=$(($end_time-$start_time))

printf "%sMysql Dump Completed In $elapsed seconds\n"

printf "******************************\n"

PS: Rememember to install pv and zip in your ubuntu

sudo apt install pv
sudo apt install zip

Here is how I set crontab by using crontab -e in ubuntu to run every 6 hours

0 */6 * * * sh /path/to/shfile/backup-mysql.sh >> /path/to/logs/backup-mysql.log 2>&1

Cool thing is it will create a zip file which is easier to unzip from anywhere

TypeError: expected str, bytes or os.PathLike object, not _io.BufferedReader

I think it has to do with your second element in storbinary. You are trying to open file, but it is already a pointer to the file you opened in line file = open(local_path,'rb'). So, try to use ftp.storbinary("STOR " + i, file).

Can Javascript read the source of any web page?

Javascript can be used, as long as you grab whatever page you're after via a proxy on your domain:

<html>
<head>
<script src="/js/jquery-1.3.2.js"></script>
</head>
<body>
<script>
$.get("www.mydomain.com/?url=www.google.com", function(response) { 
    alert(response) 
});
</script>
</body>

ld.exe: cannot open output file ... : Permission denied

If you think the executable is locked by a process, try Process Explorer from SysInternals. In the File/handle, enter Fibonacci.exe and you should see who holds the file.

If it is not enough, you can use Process Monitor (from SysInternals, again) to follow the activity of all processes on your system on Fibonacci.exe. With a little bit of analysis (call stacks), you'll may find out why the access to the file is denied and what make it disappear.

Execute Shell Script after post build in Jenkins

If I'm reading your question right, you want to run a script in the post build actions part of the build.

I myself use PostBuildScript Plugin for running git clean -fxd after the build has archived artifacts and published test results. My Jenkins slaves have SSD disks, so I do not have the room keep generated files in the workspace.

Declaring a boolean in JavaScript using just var

You can use and test uninitialized variables at least for their 'definedness'. Like this:

var iAmNotDefined;
alert(!iAmNotDefined); //true
//or
alert(!!iAmNotDefined); //false

Furthermore, there are many possibilites: if you're not interested in exact types use the '==' operator (or ![variable] / !![variable]) for comparison (that is what Douglas Crockford calls 'truthy' or 'falsy' I think). In that case assigning true or 1 or '1' to the unitialized variable always returns true when asked. Otherwise [if you need type safe comparison] use '===' for comparison.

var thisMayBeTrue;

thisMayBeTrue = 1;
alert(thisMayBeTrue == true); //=> true
alert(!!thisMayBeTrue); //=> true
alert(thisMayBeTrue === true); //=> false

thisMayBeTrue = '1';
alert(thisMayBeTrue == true); //=> true 
alert(!!thisMayBeTrue); //=> true
alert(thisMayBeTrue === true); //=> false
// so, in this case, using == or !! '1' is implicitly 
// converted to 1 and 1 is implicitly converted to true)

thisMayBeTrue = true;
alert(thisMayBeTrue == true); //=> true
alert(!!thisMayBeTrue); //=> true
alert(thisMayBeTrue === true); //=> true

thisMayBeTrue = 'true';
alert(thisMayBeTrue == true); //=> false
alert(!!thisMayBeTrue); //=> true
alert(thisMayBeTrue === true); //=> false
// so, here's no implicit conversion of the string 'true'
// it's also a demonstration of the fact that the 
// ! or !! operator tests the 'definedness' of a variable.

PS: you can't test 'definedness' for nonexisting variables though. So:

alert(!!HelloWorld);

gives a reference Error ('HelloWorld is not defined')

(is there a better word for 'definedness'? Pardon my dutch anyway;~)

Linux/Unix command to determine if process is running?

You SHOULD know the PID !

Finding a process by trying to do some kind of pattern recognition on the process arguments (like pgrep "mysqld") is a strategy that is doomed to fail sooner or later. What if you have two mysqld running? Forget that approach. You MAY get it right temporarily and it MAY work for a year or two but then something happens that you haven't thought about.

Only the process id (pid) is truly unique.

Always store the pid when you launch something in the background. In Bash this can be done with the $! Bash variable. You will save yourself SO much trouble by doing so.

How to determine if process is running (by pid)

So now the question becomes how to know if a pid is running.

Simply do:

ps -o pid= -p <pid>

This is POSIX and hence portable. It will return the pid itself if the process is running or return nothing if the process is not running. Strictly speaking the command will return a single column, the pid, but since we've given that an empty title header (the stuff immediately preceding the equals sign) and this is the only column requested then the ps command will not use header at all. Which is what we want because it makes parsing easier.

This will work on Linux, BSD, Solaris, etc.

Another strategy would be to test on the exit value from the above ps command. It should be zero if the process is running and non-zero if it isn't. The POSIX spec says that ps must exit >0 if an error has occurred but it is unclear to me what constitutes 'an error'. Therefore I'm not personally using that strategy although I'm pretty sure it will work as well on all Unix/Linux platforms.

Is Java's assertEquals method reliable?

The JUnit assertEquals(obj1, obj2) does indeed call obj1.equals(obj2).

There's also assertSame(obj1, obj2) which does obj1 == obj2 (i.e., verifies that obj1 and obj2 are referencing the same instance), which is what you're trying to avoid.

So you're fine.

Sleeping in a batch file

There are lots of ways to accomplish a 'sleep' in cmd/batch:

My favourite one:

TIMEOUT /NOBREAK 5 >NUL 2>NUL

This will stop the console for 5 seconds, without any output.

Most used:

ping localhost -n 5 >NUL 2>NUL

This will try to make a connection to localhost 5 times. Since it is hosted on your computer, it will always reach the host, so every second it will try the new every second. The -n flag indicates how many times the script will try the connection. In this case is 5, so it will last 5 seconds.

Variants of the last one:

ping 1.1.1.1 -n 5 >nul

In this script there are some differences comparing it with the last one. This will not try to call localhost. Instead, it will try to connect to 1.1.1.1, a very fast website. The action will last 5 seconds only if you have an active internet connection. Else it will last approximately 15 to complete the action. I do not recommend using this method.

ping 127.0.0.1 -n 5 >nul

This is exactly the same as example 2 (most used). Also, you can also use:

ping [::1] -n 5 >nul

This instead, uses IPv6's localhost version.

There are lots of methods to perform this action. However, I prefer method 1 for Windows Vista and later versions and the most used method (method 2) for earlier versions of the OS.

Disable submit button on form submit

I have been using blockUI to avoid browser incompatibilies on disabled or hidden buttons.

http://malsup.com/jquery/block/#element

Then my buttons have a class autobutton:

  $(".autobutton").click(
     function(event) {
        var nv = $(this).html();
        var nv2 = '<span class="fa fa-circle-o-notch fa-spin" aria-hidden="true"></span> ' + nv;
        $(this).html(nv2);
        var form = $(this).parents('form:first');

        $(this).block({ message: null });
        form.submit();                
        });   

Then a form is like that:

<form>
....
<button class="autobutton">Submit</button>   
</form>

Pick a random value from an enum?

I would use this:

private static Random random = new Random();

public Object getRandomFromEnum(Class<? extends Enum<?>> clazz) {
    return clazz.values()[random.nextInt(clazz.values().length)];
}

Call Stored Procedure within Create Trigger in SQL Server

The following should do the trick - Only SqlServer


Alter TRIGGER Catagory_Master_Date_update ON Catagory_Master AFTER delete,Update
AS
BEGIN

SET NOCOUNT ON;

Declare @id int
DECLARE @cDate as DateTime
    set @cDate =(select Getdate())

select @id=deleted.Catagory_id from deleted
print @cDate

execute dbo.psp_Update_Category @id

END

Alter PROCEDURE dbo.psp_Update_Category
@id int
AS
BEGIN

DECLARE @cDate as DateTime
    set @cDate =(select Getdate())
    --Update Catagory_Master Set Modify_date=''+@cDate+'' Where Catagory_ID=@id   --@UserID
    Insert into Catagory_Master (Catagory_id,Catagory_Name) values(12,'Testing11')
END 

Codeigniter unset session

answering to your question:

How can I destroy or unset the value of the session?

I can help you by this:

$this->session->unset_userdata('some_name');

and for multiple data you can:

$array_items = array('username' => '', 'email' => '');

$this->session->unset_userdata($array_items);

and to destroy the session:

$this->session->sess_destroy();

Now for the on page change part (on the top of my mind):

you can set the config "anchor_class" of the paginator equal to the classname you want.

after that just check it with jquery onclick for that class which will send a head up to the controller function that will unset the user session.

Appending an element to the end of a list in Scala

List(1,2,3) :+ 4

Results in List[Int] = List(1, 2, 3, 4)

Note that this operation has a complexity of O(n). If you need this operation frequently, or for long lists, consider using another data type (e.g. a ListBuffer).

How can I tell where mongoDB is storing data? (its not in the default /data/db!)

While this question is targeted for Linux/Unix instances of Mongo, it's one of the first search results regardless of the operating system used, so for future Windows users that find this:

If MongoDB is set up as a Windows Service in the default manner, you can usually find it by looking at the 'Path to executable' entry in the MongoDB Service's Properties:

Properties Window showing 'Path to Executable' option

How do I verify that a string only contains letters, numbers, underscores and dashes?

If it were not for the dashes and underscores, the easiest solution would be

my_little_string.isalnum()

(Section 3.6.1 of the Python Library Reference)

How to use local docker images with Minikube?

One approach is to build the image locally and then do:

docker save imageNameGoesHere | pv | (eval $(minikube docker-env) && docker load)

minikube docker-env might not return the correct info running under a different user / sudo. Instead you can run sudo -u yourUsername minikube docker-env.

It should return something like:

export DOCKER_TLS_VERIFY="1"
export DOCKER_HOST="tcp://192.168.99.100:2376"
export DOCKER_CERT_PATH="/home/chris/.minikube/certs"
export DOCKER_API_VERSION="1.23"
# Run this command to configure your shell:
# eval $(minikube docker-env)

Convert NSArray to NSString in Objective-C

One approach would be to iterate over the array, calling the description message on each item:

NSMutableString * result = [[NSMutableString alloc] init];
for (NSObject * obj in array)
{
    [result appendString:[obj description]];
}
NSLog(@"The concatenated string is %@", result);

Another approach would be to do something based on each item's class:

NSMutableString * result = [[NSMutableString alloc] init];
for (NSObject * obj in array)
{
    if ([obj isKindOfClass:[NSNumber class]])
    {
        // append something
    }
    else
    {
        [result appendString:[obj description]];
    }
}
NSLog(@"The concatenated string is %@", result);

If you want commas and other extraneous information, you can just do:

NSString * result = [array description];

MySQL root access from all hosts

I'm using AWS LightSail and for my instance to work, I had to change:

bind-address = 127.0.0.1

to

bind-address = <Private IP Assigned by Amazon>

Then I was able to connect remotely.

org.json.simple cannot be resolved

try this

<!-- https://mvnrepository.com/artifact/com.googlecode.json-simple/json-simple -->
<dependency>
    <groupId>com.googlecode.json-simple</groupId>
    <artifactId>json-simple</artifactId>
    <version>1.1.1</version>
</dependency>

npm ERR! network getaddrinfo ENOTFOUND

I had this issue in my Arch Linux distro with npm 14.3.0 (w/ npm 6.14.5). I simply deleted the ~/.npm directory and tried again and this time it worked.

GnuPG: "decryption failed: secret key not available" error from gpg on Windows

Yes, your secret key appears to be missing. Without it, you will not be able to decrypt the files.

Do you have the key backed up somewhere?

Re-creating the keys, whether you use the same passphrase or not, will not work. Each key pair is unique.

How to downgrade to older version of Gradle

Change your gradle version in project setting: If you are using mac,click File->Project structure,then change gradle version,here: enter image description here

And check your build.gradle of project,change dependency of gradle,like this:

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:1.0.1'
    }
}

Could not load file or assembly 'xxx' or one of its dependencies. An attempt was made to load a program with an incorrect format

Make sure you verify your setting for "Prefer 32-bit". In my case Visual Studio 2012 had this setting checked by default. Trying to use anything from an external DLL failed until I unchecked "Prefer 32-bit".

enter image description here

Why can't I declare static methods in an interface?

With Java 8, interfaces can now have static methods.

For example, Comparator has a static naturalOrder() method.

The requirement that interfaces cannot have implementations has also been relaxed. Interfaces can now declare "default" method implementations, which are like normal implementations with one exception: if you inherit both a default implementation from an interface and a normal implementation from a superclass, the superclass's implementation will always take priority.

Homebrew refusing to link OpenSSL

Note: this no longer works due to https://github.com/Homebrew/brew/pull/612

I had the same problem today. I uninstalled (unbrewed??) openssl 1.0.2 and installed 1.0.1 also with homebrew. Dotnet new/restore/run then worked fine.

Install openssl 101:
brew install homebrew/versions/openssl101
Linking:
brew link --force homebrew/versions/openssl101

Java URLConnection Timeout

Try this:

       import java.net.HttpURLConnection;

       URL url = new URL("http://www.myurl.com/sample.xml");

       HttpURLConnection huc = (HttpURLConnection) url.openConnection();
       HttpURLConnection.setFollowRedirects(false);
       huc.setConnectTimeout(15 * 1000);
       huc.setRequestMethod("GET");
       huc.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1.2) Gecko/20090729 Firefox/3.5.2 (.NET CLR 3.5.30729)");
       huc.connect();
       InputStream input = huc.getInputStream();

OR

       import org.jsoup.nodes.Document;

       Document doc = null;
       try {
           doc = Jsoup.connect("http://www.myurl.com/sample.xml").get();
       } catch (Exception e) {
           //log error
       }

And take look on how to use Jsoup: http://jsoup.org/cookbook/input/load-document-from-url

How to get current date time in milliseconds in android

I think leverage this functionality using Java

long time= System.currentTimeMillis();

this will return current time in milliseconds mode . this will surely work

long time= System.currentTimeMillis();
android.util.Log.i("Time Class ", " Time value in millisecinds "+time);

Here is my logcat using the above function

05-13 14:38:03.149: INFO/Time Class(301): Time value in millisecinds 1368436083157

If you got any doubt with millisecond value .Check Here

EDIT : Time Zone I used to demo the code IST(+05:30) ,So if you check milliseconds that mentioned in log to match with time in log you might get a different value based your system timezone

EDIT: This is easy approach .but if you need time zone or any other details I think this won't be enough Also See this approach using android api support

How to use group by with union in t-sql

with UnionTable as  
(
    SELECT a.id, a.time FROM dbo.a
    UNION
    SELECT b.id, b.time FROM dbo.b
) SELECT id FROM UnionTable GROUP BY id

Windows.history.back() + location.reload() jquery

After struggling with this for a few days, it turns out that you can't do a window.location.reload() after a window.history.go(-2), because the code stops running after the window.history.go(-2). Also the html spec basically views a history.go(-2) to the the same as hitting the back button and should retrieve the page as it was instead of as it now may be. There was some talk of setting caching headers in the webserver to turn off caching but I did not want to do this.

The solution for me was to use session storage to set a flag in the browser with sessionStorage.setItem('refresh', 'true'); Then in the "theme" or the next page that needs to be refreshed do:

if (sessionStorage.getItem("refresh") == "true") { 
    sessionStorage.removeItem("refresh"); window.location.reload()
}

So basically tell it to reload in the sessionStorage then check for that at the top of the page that needs to be reloaded.

Hope this helps someone with this bit of frustration.

ORA-00907: missing right parenthesis

Firstly, in histories_T, you are referencing table T_customer (should be T_customers) and secondly, you are missing the FOREIGN KEY clause that REFERENCES orders; which is not being created (or dropped) with the code you provided.

There may be additional errors as well, and I admit Oracle has never been very good at describing the cause of errors - "Mutating Tables" is a case in point.

Let me know if there additional problems you are missing.

Working with SQL views in Entity Framework Core

Here is a new way to work with SQL views in EF Core: Query Types.

Store output of subprocess.Popen call in a string

In Python 3.7 a new keyword argument capture_output was introduced for subprocess.run. Enabling the short and simple:

import subprocess

p = subprocess.run("echo 'hello world!'", capture_output=True, shell=True, encoding="utf8")
assert p.stdout == 'hello world!\n'

Access cell value of datatable

You can also try (first cell in 4th column):

dt.Rows[0][3]

Comprehensive methods of viewing memory usage on Solaris

"top" is usually available on Solaris.

If not then revert to "vmstat" which is available on most UNIX system.

It should look something like this (from an AIX box)

vmstat

System configuration: lcpu=4 mem=12288MB ent=2.00

kthr    memory              page              faults              cpu
----- ----------- ------------------------ ------------ -----------------------
 r  b   avm   fre  re  pi  po  fr   sr  cy  in   sy  cs us sy id wa    pc    ec
 2  1 1614644 585722   0   0   1  22  104   0 808 29047 2767 12  8 77  3  0.45  22.3

the colums "avm" and "fre" tell you the total memory and free memery.

a "man vmstat" should get you the gory details.

Why avoid increment ("++") and decrement ("--") operators in JavaScript?

Is Fortran a C-like language? It has neither ++ nor --. Here is how you write a loop:

     integer i, n, sum

      sum = 0
      do 10 i = 1, n
         sum = sum + i
         write(*,*) 'i =', i
         write(*,*) 'sum =', sum
  10  continue

The index element i is incremented by the language rules each time through the loop. If you want to increment by something other than 1, count backwards by two for instance, the syntax is ...

      integer i

      do 20 i = 10, 1, -2
         write(*,*) 'i =', i
  20  continue

Is Python C-like? It uses range and list comprehensions and other syntaxes to bypass the need for incrementing an index:

print range(10,1,-2) # prints [10,8.6.4.2]
[x*x for x in range(1,10)] # returns [1,4,9,16 ... ]

So based on this rudimentary exploration of exactly two alternatives, language designers may avoid ++ and -- by anticipating use cases and providing an alternate syntax.

Are Fortran and Python notably less of a bug magnet than procedural languages which have ++ and --? I have no evidence.

I claim that Fortran and Python are C-like because I have never met someone fluent in C who could not with 90% accuracy guess correctly the intent of non-obfuscated Fortran or Python.

How do I import a .dmp file into Oracle?

imp system/system-password@SID file=directory-you-selected\FILE.dmp log=log-dir\oracle_load.log fromuser=infodba touser=infodba commit=Y

How to break lines in PowerShell?

If escaping doesn't work, you can try this:

$str += $("" | Out-String)

It just adds nothing, but as an Out-String, which creates a new line.

Deserializing JSON array into strongly typed .NET object

Pat, the json structure looks very familiar to a problem i described here - The answer for me was to treat the json representation as a Dictionary<TKey, TValue>, even though there was only 1 entry.

If I am correct your key is of type string and the value of a List<T> where T represents the class 'TheUser'

HTH

PS - if you want better serialisation perf check out using Silverlight Serializer, you'll need to build a WP7 version, Shameless plug - I wrote a blog post about this

How to easily import multiple sql files into a MySQL database?

Save this file as .bat and run it , change variables inside parenthesis ...

@echo off
title Mysql Import Script
cd (Folder Name)
 for %%a in (*) do (
     echo Importing File  : %%a 
     mysql -u(username) -p(password)  %%~na < %%a
)
pause

if it's only one database modify (%%~na) with the database name .

Java converting Image to BufferedImage

One way to handle this is to create a new BufferedImage, and tell it's graphics object to draw your scaled image into the new BufferedImage:

final float FACTOR  = 4f;
BufferedImage img = ImageIO.read(new File("graphic.png"));
int scaleX = (int) (img.getWidth() * FACTOR);
int scaleY = (int) (img.getHeight() * FACTOR);
Image image = img.getScaledInstance(scaleX, scaleY, Image.SCALE_SMOOTH);
BufferedImage buffered = new BufferedImage(scaleX, scaleY, TYPE);
buffered.getGraphics().drawImage(image, 0, 0 , null);

That should do the trick without casting.

How can I fix assembly version conflicts with JSON.NET after updating NuGet package references in a new ASP.NET MVC 5 project?

If none of the above works, try using this in web.config or app.config:

<runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
        <dependentAssembly>
            <assemblyIdentity name="Newtonsoft.Json" publicKeyToken="30AD4FE6B2A6AEED" culture="neutral"/>
            <bindingRedirect oldVersion="0.0.0.0-6.0.0.0" newVersion="6.0.0.0"/>
        </dependentAssembly>
    </assemblyBinding>
</runtime>

Java Currency Number format

I know this is an old question but...

import java.text.*;

public class FormatCurrency
{
    public static void main(String[] args)
    {
        double price = 123.4567;
        DecimalFormat df = new DecimalFormat("#.##");
        System.out.print(df.format(price));
    }
}

MySQL select one column DISTINCT, with corresponding other columns

The DISTINCT keyword doesn't really work the way you're expecting it to. When you use SELECT DISTINCT col1, col2, col3 you are in fact selecting all unique {col1, col2, col3} tuples.

Is there a mechanism to loop x times in ES6 (ECMAScript 6) without mutable variables?

addressing the functional aspect:

function times(n, f) {
    var _f = function (f) {
        var i;
        for (i = 0; i < n; i++) {
            f(i);
        }
    };
    return typeof f === 'function' && _f(f) || _f;
}
times(6)(function (v) {
    console.log('in parts: ' + v);
});
times(6, function (v) {
    console.log('complete: ' + v);
});

How to set session timeout in web.config

If you are using MVC, you put this in the web.config file in the Root directory of the web application, not the web.config in the Views directory. It also needs to be IN the system.web node, not under like George2 stated in his question: "I wrote under system.web section in the web.config"

The timeout parameter value represents minutes.

There are other attributes that can be set in the sessionState element. You can find information here: docs.microsoft.com sessionState

<configuration>
   <system.web>
      <sessionState timeout="20"></sessionState>
   </system.web>
</configuration>

You can then catch the begining of a new session in the Global.asax file by adding the following method:

void Session_Start(object sender, EventArgs e)
{
    if (Session.IsNewSession)
    {
        //do things that need to happen
        //when a new session starts.
    }
}

Xcode 7.2 no matching provisioning profiles found

Using Xcode 7.3, I spent way too much time trying to figure this out -- none of the answers here or elsewhere did the trick -- and ultimately stumbled into a ridiculously easy solution.

  1. In the Xcode preferences team settings, delete all provisioning profiles as mentioned in several other answers. I do this with right click, "Show in Finder," Command+A, delete -- it seems these details have changed over different Xcode versions.
  2. Do not re-download any profiles. Instead, exit your preferences and rebuild your project (I built it for my connected iPhone). A little while into the build sequence there will be an alert informing you no provisioning profiles were found, and it will ask if you want this to be fixed automatically. Choose to fix it automatically.
  3. After Xcode does some stuff, you will magically have a new provisioning profile providing what your app needs. I have since uploaded my app for TestFlight and it works great.

Hope this helps someone.

How to handle the `onKeyPress` event in ReactJS?

For me onKeyPress the e.keyCode is always 0, but e.charCode has correct value. If used onKeyDown the correct code in e.charCode.

var Title = React.createClass({
    handleTest: function(e) {
      if (e.charCode == 13) {
        alert('Enter... (KeyPress, use charCode)');
      }
      if (e.keyCode == 13) {
        alert('Enter... (KeyDown, use keyCode)');
      }
    },
    render: function() {
      return(
        <div>
          <textarea onKeyPress={this.handleTest} />
        </div>
      );
    }
  });

React Keyboard Events.

How to add a class with React.js?

this is pretty useful:

https://github.com/JedWatson/classnames

You can do stuff like

classNames('foo', 'bar'); // => 'foo bar'
classNames('foo', { bar: true }); // => 'foo bar'
classNames({ 'foo-bar': true }); // => 'foo-bar'
classNames({ 'foo-bar': false }); // => ''
classNames({ foo: true }, { bar: true }); // => 'foo bar'
classNames({ foo: true, bar: true }); // => 'foo bar'

// lots of arguments of various types
classNames('foo', { bar: true, duck: false }, 'baz', { quux: true }); // => 'foo bar baz quux'

// other falsy values are just ignored
classNames(null, false, 'bar', undefined, 0, 1, { baz: null }, ''); // => 'bar 1'

or use it like this

var btnClass = classNames('btn', this.props.className, {
  'btn-pressed': this.state.isPressed,
  'btn-over': !this.state.isPressed && this.state.isHovered
});

The system cannot find the file specified. in Visual Studio

This is because you have not compiled it. Click 'Project > compile'. Then, either click 'start debugging', or 'start without debugging'.

What is a practical use for a closure in JavaScript?

I wrote an article a while back about how closures can be used to simplify event-handling code. It compares ASP.NET event handling to client-side jQuery.

http://www.hackification.com/2009/02/20/closures-simplify-event-handling-code/

Text to speech(TTS)-Android

Text to speech is built into Android 1.6+. Here is a simple example of how to do it.

TextToSpeech tts = new TextToSpeech(this, this);
tts.setLanguage(Locale.US);
tts.speak("Text to say aloud", TextToSpeech.QUEUE_ADD, null);

More info: http://android-developers.blogspot.com/2009/09/introduction-to-text-to-speech-in.html


Here are instructions on how to download sample code from the Android SDK Manager:

  1. Launch the Android SDK Manager.

    a. On Windows, double-click the SDK Manager.exe file at the root of the Android SDK directory.

    b. On Mac or Linux, open a terminal to the tools/ directory in the Android SDK, then execute android sdk.

  2. Expand the list of packages for the latest Android platform.

  3. Select and download Samples for SDK. When the download is complete, you can find the source code for all samples at this location:

/sdk/samples/android-version/

(i.e. \android-sdk-windows\samples\android-16\ApiDemos\src\com\example\android\apis\app\TextToSpeechActivity.java)

How to dump only specific tables from MySQL?

Usage: mysqldump [OPTIONS] database [tables]

i.e.

mysqldump -u username -p db_name table1_name table2_name table3_name > dump.sql

Unable to call the built in mb_internal_encoding method?

apt-get install php7.3-mbstring solved the issue on ubuntu, php version is php-fpm 7.3

How to install packages offline?

Download the tarball, transfer it to your FreeBSD machine and extract it, afterwards run python setup.py install and you're done!

EDIT: Just to add on that, you can also install the tarballs with pip now.

ASP.NET MVC Bundle not rendering script files on staging server. It works on development server

By adding following code of line in bundle to config it works for me

bundles.IgnoreList.Clear();  

Follow the link for more explanation

Select unique values with 'select' function in 'dplyr' library

In dplyr 0.3 this can be easily achieved using the distinct() method.

Here is an example:

distinct_df = df %>% distinct(field1)

You can get a vector of the distinct values with:

distinct_vector = distinct_df$field1

You can also select a subset of columns at the same time as you perform the distinct() call, which can be cleaner to look at if you examine the data frame using head/tail/glimpse.:

distinct_df = df %>% distinct(field1) %>% select(field1) distinct_vector = distinct_df$field1

Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[]]

Just go to the project Properties->Project Facets

  1. Uncheck the dynamic module, click apply.

  2. Maven->update the project.

How can I export data to an Excel file

I used interop to open Excel and to modify the column widths once the data was done. If you use interop to spit the data into a new Excel workbook (if this is what you want), it will be terribly slow. Instead, I generated a .CSV, then opened the .CSV in Excel. This has its own problems, but I've found this the quickest method.

First, convert the .CSV:

// Convert array data into CSV format.
// Modified from http://csharphelper.com/blog/2018/04/write-a-csv-file-from-an-array-in-c/.
private string GetCSV(List<string> Headers, List<List<double>> Data)
{
    // Get the bounds.
    var rows = Data[0].Count;
    var cols = Data.Count;
    var row = 0;

    // Convert the array into a CSV string.
    StringBuilder sb = new StringBuilder();

    // Add the first field in this row.
    sb.Append(Headers[0]);

    // Add the other fields in this row separated by commas.
    for (int col = 1; col < cols; col++)
        sb.Append("," + Headers[col]);

    // Move to the next line.
    sb.AppendLine();

    for (row = 0; row < rows; row++)
    {
        // Add the first field in this row.
        sb.Append(Data[0][row]);

        // Add the other fields in this row separated by commas.
        for (int col = 1; col < cols; col++)
            sb.Append("," + Data[col][row]);

        // Move to the next line.
        sb.AppendLine();
    }

    // Return the CSV format string.
    return sb.ToString();
}

Then, export it to Excel:

public void ExportToExcel()
{
    // Initialize app and pop Excel on the screen.
    var excelApp = new Excel.Application { Visible = true };

    // I use unix time to give the files a unique name that's almost somewhat useful.
    DateTime dateTime = DateTime.UtcNow;
    long unixTime = ((DateTimeOffset)dateTime).ToUnixTimeSeconds();
    var path = @"C:\Users\my\path\here + unixTime + ".csv";

    var csv = GetCSV();
    File.WriteAllText(path, csv);

    // Create a new workbook and get its active sheet.
    excelApp.Workbooks.Open(path);

    var workSheet = (Excel.Worksheet)excelApp.ActiveSheet;

    // iterate over each value and throw it in the chart
    for (var column = 0; column < Data.Count; column++)
    {
        ((Excel.Range)workSheet.Columns[column + 1]).AutoFit();
    }

    currentSheet = workSheet;
}

You'll have to install some stuff, too...

  1. Right click on the solution from solution explorer and select "Manage NuGet Packages." - add Microsoft.Office.Interop.Excel

  2. It might actually work right now if you created the project the way interop wants you to. If it still doesn't work, I had to create a new project in a different category. Under New > Project, select Visual C# > Windows Desktop > Console App. Otherwise, the interop tools won't work.

In case I forgot anything, here's my 'using' statements:

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using Excel = Microsoft.Office.Interop.Excel;

How to check if DST (Daylight Saving Time) is in effect, and if so, the offset?

I was faced with this same problem today but since our daylight saving starts and stops at differing times from the USA (at least from my understanding), I used a slightly different route..

var arr = [];
for (var i = 0; i < 365; i++) {
 var d = new Date();
 d.setDate(i);
 newoffset = d.getTimezoneOffset();
 arr.push(newoffset);
}
DST = Math.min.apply(null, arr);
nonDST = Math.max.apply(null, arr);

Then you simply compare the current timezone offset with DST and nonDST to see which one matches.

OVER_QUERY_LIMIT in Google Maps API v3: How do I pause/delay in Javascript to slow it down?

The general answer to this question is:

Don't geocode known locations every time you load your page. Geocode them off-line and use the resulting coordinates to display the markers on your page.

The limits exist for a reason.

If you can't geocode the locations off-line, see this page (Part 17 Geocoding multiple addresses) from Mike Williams' v2 tutorial which describes an approach, port that to the v3 API.

EPPlus - Read Excel Table

Working solution with validate email,mobile number

 public class ExcelProcessing
        {
            public List<ExcelUserData> ReadExcel()
            {
                string path = Config.folderPath + @"\MemberUploadFormat.xlsx";
    
                using (var excelPack = new ExcelPackage())
                {
                    //Load excel stream
                    using (var stream = File.OpenRead(path))
                    {
                        excelPack.Load(stream);
                    }
    
                    //Lets Deal with first worksheet.(You may iterate here if dealing with multiple sheets)
                    var ws = excelPack.Workbook.Worksheets[0];
    
                    List<ExcelUserData> userList = new List<ExcelUserData>();
    
                    int colCount = ws.Dimension.End.Column;  //get Column Count
                    int rowCount = ws.Dimension.End.Row;
                       
                    for (int row = 2; row <= rowCount; row++) // start from to 2 omit header
                    {
                       
                        bool IsValid = true;
                        ExcelUserData _user = new ExcelUserData();
    
                        for (int col = 1; col <= colCount; col++)
                        {
                            if (col == 1)
                            {
                                _user.FirstName = ws.Cells[row, col].Value?.ToString().Trim();
                                if (string.IsNullOrEmpty(_user.FirstName))
                                {
                                    _user.ErrorMessage += "Enter FirstName <br/>";
                                    IsValid = false;
                                }
                            }
                            else if (col == 2)
                            {
                                _user.Email = ws.Cells[row, col].Value?.ToString().Trim();
    
                                if (string.IsNullOrEmpty(_user.Email))
                                {
                                    _user.ErrorMessage += "Enter Email <br/>";
                                    IsValid = false;
                                }
                                else if (!IsValidEmail(_user.Email))
                                {
                                    _user.ErrorMessage += "Invalid Email Address <br/>";
                                    IsValid = false;
                                }
                            }
                            else if (col ==3)
                            {
                                _user.MobileNo = ws.Cells[row, col].Value?.ToString().Trim();
    
                                if (string.IsNullOrEmpty(_user.MobileNo))
                                {
                                    _user.ErrorMessage += "Enter Mobile No <br/>";
                                    IsValid = false;
                                }
                                else if (_user.MobileNo.Length != 10)
                                {
                                    _user.ErrorMessage += "Invalid Mobile No <br/>";
                                    IsValid = false;
                                }
    
                            }
                            else if (col == 4)
                            {
                                _user.IsAdmin = ws.Cells[row, col].Value?.ToString().Trim();
    
                                if (string.IsNullOrEmpty(_user.IsAdmin))
                                {
                                    _user.IsAdmin = "0";
                                }
                            }
    
                            _user.IsValid = IsValid;
                        }
                        userList.Add(_user);
                    }
                    return userList;
                }
            }
            public static bool IsValidEmail(string email)
            {
                Regex regex = new Regex(@"^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$",
                 RegexOptions.CultureInvariant | RegexOptions.Singleline);
    
                return regex.IsMatch(email);
            }
        }

How to get Exception Error Code in C#

I suggest you to use Message Properte from The Exception Object Like below code

try
{
 object result = processClass.InvokeMethod("Create", methodArgs);
}
catch (Exception e)
{  
    //use Console.Write(e.Message); from Console Application 
    //and use MessageBox.Show(e.Message); from WindowsForm and WPF Application
}

How do you add UI inside cells in a google spreadsheet using app script?

The apps UI only works for panels.

The best you can do is to draw a button yourself and put that into your spreadsheet. Than you can add a macro to it.

Go into "Insert > Drawing...", Draw a button and add it to the spreadsheet. Than click it and click "assign Macro...", then insert the name of the function you wish to execute there. The function must be defined in a script in the spreadsheet.

Alternatively you can also draw the button somewhere else and insert it as an image.

More info: https://developers.google.com/apps-script/guides/menus

enter image description here enter image description here enter image description here

How can I return the sum and average of an int array?

This is the way you should be doing it, and I say this because you are clearly new to C# and should probably try to understand how some basic stuff works!

public int Sum(params int[] customerssalary)
{
   int result = 0;

   for(int i = 0; i < customerssalary.Length; i++)
   {
      result += customerssalary[i];
   }

   return result;
}

with this Sum function, you can use this to calculate the average too...

public decimal Average(params int[] customerssalary)
{
   int sum = Sum(customerssalary);
   decimal result = (decimal)sum / customerssalary.Length;
   return result;
}

the reason for using a decimal type in the second function is because the division can easily return a non-integer result


Others have provided a Linq alternative which is what I would use myself anyway, but with Linq there is no point in having your own functions anyway. I have made the assumption that you have been asked to implement such functions as a task to demonstrate your understanding of C#, but I could be wrong.

How to reload a page using JavaScript

Automatic reload page after 20 seconds.

<script>
    window.onload = function() {
        setTimeout(function () {
            location.reload()
        }, 20000);
     };
</script>

Edit and Continue: "Changes are not allowed when..."

I did all the changes mentioned in every other answer and none worked. What did I learn? Enable and Continue exists in both the Tools > Options > Debugging menu and also in the Project settings. After I checked both, Enable and Continue worked for me.

How can I display a tooltip on an HTML "option" tag?

If increasing the number of visible options is available, the following might work for you:

<html>
    <head>
        <title>Select Option Tooltip Test</title>
        <script>
            function showIETooltip(e){
                if(!e){var e = window.event;}
                var obj = e.srcElement;
                var objHeight = obj.offsetHeight;
                var optionCount = obj.options.length;
                var eX = e.offsetX;
                var eY = e.offsetY;

                //vertical position within select will roughly give the moused over option...
                var hoverOptionIndex = Math.floor(eY / (objHeight / optionCount));

                var tooltip = document.getElementById('dvDiv');
                tooltip.innerHTML = obj.options[hoverOptionIndex].title;

                mouseX=e.pageX?e.pageX:e.clientX;
                mouseY=e.pageY?e.pageY:e.clientY;

                tooltip.style.left=mouseX+10;
                tooltip.style.top=mouseY;

                tooltip.style.display = 'block';

                var frm = document.getElementById("frm");
                frm.style.left = tooltip.style.left;
                frm.style.top = tooltip.style.top;
                frm.style.height = tooltip.offsetHeight;
                frm.style.width = tooltip.offsetWidth;
                frm.style.display = "block";
            }
            function hideIETooltip(e){
                var tooltip = document.getElementById('dvDiv');
                var iFrm = document.getElementById('frm');
                tooltip.innerHTML = '';
                tooltip.style.display = 'none';
                iFrm.style.display = 'none';
            }
        </script>
    </head>
    <body>
        <select onmousemove="showIETooltip();" onmouseout="hideIETooltip();" size="10">
            <option title="Option #1" value="1">Option #1</option>
            <option title="Option #2" value="2">Option #2</option>
            <option title="Option #3" value="3">Option #3</option>
            <option title="Option #4" value="4">Option #4</option>
            <option title="Option #5" value="5">Option #5</option>
            <option title="Option #6" value="6">Option #6</option>
            <option title="Option #7" value="7">Option #7</option>
            <option title="Option #8" value="8">Option #8</option>
            <option title="Option #9" value="9">Option #9</option>
            <option title="Option #10" value="10">Option #10</option>
        </select>
        <div id="dvDiv" style="display:none;position:absolute;padding:1px;border:1px solid #333333;;background-color:#fffedf;font-size:smaller;z-index:999;"></div>
        <iframe id="frm" style="display:none;position:absolute;z-index:998"></iframe>
    </body>
</html>

Make child visible outside an overflow:hidden parent

For others, if clearfix does not solve this for you, add margins to the non-floated sibling that is/are the same as the width(s) of the floated sibling(s).

Get array elements from index to end

The [:-1] removes the last element. Instead of

a[3:-1]

write

a[3:]

You can read up on Python slicing notation here: Explain Python's slice notation

NumPy slicing is an extension of that. The NumPy tutorial has some coverage: Indexing, Slicing and Iterating.

How to check whether a str(variable) is empty or not?

Empty strings are False by default:

>>> if not "":
...     print("empty")
...
empty

symbol(s) not found for architecture i386

I've been stumped by this one before only to realize I added a data-only @interface and forgot to add the empty @implementation block.

Waiting for HOME ('android.process.acore') to be launched

None of these solutions worked for me. Instead, what worked was to go to a command line tool (or terminal in Mac), CD into the SDK/platform-tools directory, and then run this:

adb kill-server

then run this:

adb start-server

After I did this everything worked again. Why? Who knows.

On my MAC the path to the platform-tools folder was $HOME/Installations/adt-bundle-mac-x86_64-20130522/sdk/platform-tools It will probably be somewhere else on your machine.

I also found this page that presents some helpful steps:

http://android.okhelp.cz/android-emulator-wont-run-application-started-from-eclipse/

how to run a command at terminal from java program?

I vote for Karthik T's answer. you don't need to open a terminal to run commands.

For example,

// file: RunShellCommandFromJava.java
import java.io.BufferedReader;
import java.io.InputStreamReader;

public class RunShellCommandFromJava {

    public static void main(String[] args) {

        String command = "ping -c 3 www.google.com";

        Process proc = Runtime.getRuntime().exec(command);

        // Read the output

        BufferedReader reader =  
              new BufferedReader(new InputStreamReader(proc.getInputStream()));

        String line = "";
        while((line = reader.readLine()) != null) {
            System.out.print(line + "\n");
        }

        proc.waitFor();   

    }
} 

The output:

$ javac RunShellCommandFromJava.java
$ java RunShellCommandFromJava
PING http://google.com (123.125.81.12): 56 data bytes
64 bytes from 123.125.81.12: icmp_seq=0 ttl=59 time=108.771 ms
64 bytes from 123.125.81.12: icmp_seq=1 ttl=59 time=119.601 ms
64 bytes from 123.125.81.12: icmp_seq=2 ttl=59 time=11.004 ms

--- http://google.com ping statistics ---
3 packets transmitted, 3 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 11.004/79.792/119.601/48.841 ms

Laravel Checking If a Record Exists

Laravel 5.6.26v

to find the existing record through primary key ( email or id )

    $user = DB::table('users')->where('email',$email)->first();

then

      if(!$user){
             //user is not found 
      }
      if($user){
             // user found 
      }

include " use DB " and table name user become plural using the above query like user to users

using where and inner join in mysql

Try this :

SELECT
    (
      SELECT
          `NAME`
      FROM
          locations
      WHERE
          ID = school_locations.LOCATION_ID
    ) as `NAME`
FROM
     school_locations
WHERE
     (
      SELECT
          `TYPE`
      FROM
          locations
      WHERE
          ID = school_locations.LOCATION_ID
     ) = 'coun';

Spring MVC Multipart Request with JSON

This must work!

client (angular):

$scope.saveForm = function () {
      var formData = new FormData();
      var file = $scope.myFile;
      var json = $scope.myJson;
      formData.append("file", file);
      formData.append("ad",JSON.stringify(json));//important: convert to JSON!
      var req = {
        url: '/upload',
        method: 'POST',
        headers: {'Content-Type': undefined},
        data: formData,
        transformRequest: function (data, headersGetterFunction) {
          return data;
        }
      };

Backend-Spring Boot:

@RequestMapping(value = "/upload", method = RequestMethod.POST)
    public @ResponseBody
    Advertisement storeAd(@RequestPart("ad") String adString, @RequestPart("file") MultipartFile file) throws IOException {

        Advertisement jsonAd = new ObjectMapper().readValue(adString, Advertisement.class);
//do whatever you want with your file and jsonAd

Is there a way to crack the password on an Excel VBA Project?

ElcomSoft makes Advanced Office Password Breaker and Advanced Office Password Recovery products which may apply to this case, as long as the document was created in Office 2007 or prior.

How to ensure that there is a delay before a service is started in systemd?

This answer on super user I think is a better answer. From https://superuser.com/a/573761/67952

"But since you asked for a way without using Before and After, you can use:

Type=idle

which as man systemd.service explains

Behavior of idle is very similar to simple; however, actual execution of the service program is delayed until all active jobs are dispatched. This may be used to avoid interleaving of output of shell services with the status output on the console. Note that this type is useful only to improve console output, it is not useful as a general unit ordering tool, and the effect of this service type is subject to a 5s time-out, after which the service program is invoked anyway. "

How to get the previous page URL using JavaScript?

You can use the following to get the previous URL.

var oldURL = document.referrer;
alert(oldURL);

Reactjs setState() with a dynamic key name?

Can use a spread syntax, something like this:

inputChangeHandler : function (event) {
    this.setState( { 
        ...this.state,
        [event.target.id]: event.target.value
    } );
},

Div with margin-left and width:100% overflowing on the right side

A div is a block element and by default 100% wide. You should just have to set the textarea width to 100%.

grabbing first row in a mysql query only

You didn't specify how the order is determined, but this will give you a rank value in MySQL:

SELECT t.*,
       @rownum := @rownum +1 AS rank
  FROM TBL_FOO t
  JOIN (SELECT @rownum := 0) r
 WHERE t.name = 'sarmen'

Then you can pick out what rows you want, based on the rank value.

TERM environment variable not set

You've answered the question with this statement:

Cron calls this .sh every 2 minutes

Cron does not run in a terminal, so why would you expect one to be set?

The most common reason for getting this error message is because the script attempts to source the user's .profile which does not check that it's running in a terminal before doing something tty related. Workarounds include using a shebang line like:

#!/bin/bash -p

Which causes the sourcing of system-level profile scripts which (one hopes) does not attempt to do anything too silly and will have guards around code that depends on being run from a terminal.

If this is the entirety of the script, then the TERM error is coming from something other than the plain content of the script.

jQuery: selecting each td in a tr

$('#tblNewAttendees tbody tr).each((index, tr)=> {
        //console.log(tr);
        $(tr).children('td').each ((index, td) => {
            console.log(td);

        }); 

    });

You can use this tr and td parameter also.

Why am I getting a FileNotFoundError?

Difficult to give code examples in the comments.

To read the words in the file, you can read the contents of the file, which gets you a string - this is what you were doing before, with the read() method - and then use split() to get the individual words. Split breaks up a String on the delimiter provided, or on whitespace by default. For example,

"the quick brown fox".split()

produces

['the', 'quick', 'brown', 'fox']

Similarly,

fileScan.read().split()

will give you an array of Strings. Hope that helps!

How to insert a value that contains an apostrophe (single quote)?

eduffy had a good idea. He just got it backwards in his code example. Either in JavaScript or in SQLite you can replace the apostrophe with the accent symbol.

He (accidentally I am sure) placed the accent symbol as the delimiter for the string instead of replacing the apostrophe in O'Brian. This is in fact a terrifically simple solution for most cases.

.prop('checked',false) or .removeAttr('checked')?

use checked : true, false property of the checkbox.

jQuery:

if($('input[type=checkbox]').is(':checked')) {
    $(this).prop('checked',true);
} else {
    $(this).prop('checked',false);
}