How do I format a string using a dictionary in python-3.x?

Most answers formatted only the values of the dict.

If you want to also format the key into the string you can use dict.items():

geopoint = {'latitude':41.123,'longitude':71.091}
print("{} {}".format(*geopoint.items()))

Output:

('latitude', 41.123) ('longitude', 71.091)

If you want to format in an arbitry way, that is, not showing the key-values like tuples:

from functools import reduce
print("{} is {} and {} is {}".format(*reduce((lambda x, y: x + y), [list(item) for item in geopoint.items()])))

Output:

latitude is 41.123 and longitude is 71.091

How do I get IntelliJ to recognize common Python modules?

Have you set up a python interpreter facet?

Open Project Structure CTRL+ALT+SHIFT+S

Project settings -> Facets -> expand Python click on child -> Python Interpreter

Then:

Project settings -> Modules -> Expand module -> Python -> Dependencies -> select Python module SDK

How to find indices of all occurrences of one string in another in JavaScript?

One liner using String.protype.matchAll (ES2020):

[...sourceStr.matchAll(new RegExp(searchStr, 'gi'))].map(a => a.index)

Using your values:

const sourceStr = 'I learned to play the Ukulele in Lebanon.';
const searchStr = 'le';
const indexes = [...sourceStr.matchAll(new RegExp(searchStr, 'gi'))].map(a => a.index);
console.log(indexes); // [2, 25, 27, 33]

If you're worried about doing a spread and a map() in one line, I ran it with a for...of loop for a million iterations (using your strings). The one liner averages 1420ms while the for...of averages 1150ms on my machine. That's not an insignificant difference, but the one liner will work fine if you're only doing a handful of matches.

See matchAll on caniuse

ElasticSearch: Unassigned Shards, how to fix?

For me, this was resolved by running this from the dev console: "POST /_cluster/reroute?retry_failed"

.....

I started by looking at the index list to see which indices were red and then ran

"get /_cat/shards?h=[INDEXNAME],shard,prirep,state,unassigned.reason"

and saw that it had shards stuck in ALLOCATION_FAILED state, so running the retry above caused them to re-try the allocation.

How can I make a button redirect my page to another page?

Just another variation:

    <body>
    <button name="redirect" onClick="redirect()">

    <script type="text/javascript">
    function redirect()
    {
    var url = "http://www.(url).com";
    window.location(url);
    }
    </script>

Create a basic matrix in C (input by user !)

//R stands for ROW and C stands for COLUMN:

//i stands for ROW and j stands for COLUMN:

#include<stdio.h>

int main(){

    int M[100][100];

    int R,C,i,j;

    printf("Please enter how many rows you want:\n");

    scanf("%d",& R);

    printf("Please enter how column you want:\n");

    scanf("%d",& C);

    printf("Please enter your matrix:\n");

    for(i = 0; i < R; i++){

        for(j = 0; j < C; j++){

            scanf("%d", &M[i][j]);

        }

        printf("\n");

    }
    for(i = 0; i < R; i++){

        for(j = 0; j < C; j++){

            printf("%d\t", M[i][j]);

        }
        printf("\n");

   }

   getch();

   return 0;
}

How Can I Convert Postscript Type 1 font to .otf or .ttf?

Install apps silently, with granted INSTALL_PACKAGES permission

!/bin/bash

f=/home/cox/myapp.apk   #or $1 if input from terminal.

#backup env var
backup=$LD_LIBRARY_PATH
LD_LIBRARY_PATH=/vendor/lib:/system/lib
myTemp=/sdcard/temp.apk
adb push $f $myTemp
adb shell pm install -r $myTemp
#restore env var
LD_LIBRARY_PATH=$backup

This works for me. I run this on ubuntu 12.04, on shell terminal.

Command line tool to dump Windows DLL version?

Using Powershell it is possible to get just the Version string, i.e. 2.3.4 from any dll or exe with the following command

(Get-Item "C:\program files\OpenVPN\bin\openvpn.exe").VersionInfo.ProductVersion

Tested on Windows 10

how to include glyphicons in bootstrap 3

I think your particular problem isn't how to use Glyphicons but understanding how Bootstrap files work together.

Bootstrap requires a specific file structure to work. I see from your code you have this:

<link href="bootstrap.css" rel="stylesheet" media="screen">

Your Bootstrap.css is being loaded from the same location as your page, this would create a problem if you didn't adjust your file structure.

But first, let me recommend you setup your folder structure like so:

/css      <-- Bootstrap.css here
/fonts    <-- Bootstrap fonts here
/img
/js       <-- Bootstrap JavaScript here
index.html

If you notice, this is also how Bootstrap structures its files in its download ZIP.

You then include your Bootstrap file like so:

<link href="css/bootstrap.css" rel="stylesheet" media="screen">
or
<link href="./css/bootstrap.css" rel="stylesheet" media="screen">
or
<link href="/css/bootstrap.css" rel="stylesheet" media="screen">

Depending on your server structure or what you're going for.

The first and second are relative to your file's current directory. The second one is just more explicit by saying "here" (./) first then css folder (/css).

The third is good if you're running a web server, and you can just use relative to root notation as the leading "/" will be always start at the root folder.

So, why do this?

Bootstrap.css has this specific line for Glyphfonts:

@font-face {
    font-family: 'Glyphicons Halflings';
    src: url('../fonts/glyphicons-halflings-regular.eot');
    src: url('../fonts/glyphicons-halflings-regular.eot?#iefix') format('embedded-opentype'), url('../fonts/glyphicons-halflings-regular.woff') format('woff'), url('../fonts/glyphicons-halflings-regular.ttf') format('truetype'), url('../fonts/glyphicons-halflings-regular.svg#glyphicons-halflingsregular') format('svg');
}

What you can see is that that Glyphfonts are loaded by going up one directory ../ and then looking for a folder called /fonts and THEN loading the font file.

The URL address is relative to the location of the CSS file. So, if your CSS file is at the same location like this:

/fonts
Bootstrap.css
index.html

The CSS file is going one level deeper than looking for a /fonts folder.

So, let's say the actual location of these files are:

C:\www\fonts
C:\www\Boostrap.css
C:\www\index.html

The CSS file would technically be looking for a folder at:

C:\fonts

but your folder is actually in:

C:\www\fonts

So see if that helps. You don't have to do anything 'special' to load Bootstrap Glyphicons, except make sure your folder structure is set up appropriately.

When you get that fixed, your HTML should simply be:

<span class="glyphicon glyphicon-comment"></span>

Note, you need both classes. The first class glyphicon sets up the basic styles while glyphicon-comment sets the specific image.

select2 changing items dynamically

In my project I use following code:

$('#attribute').select2();
$('#attribute').bind('change', function(){
    var $options = $();
    for (var i in data) {
        $options = $options.add(
            $('<option>').attr('value', data[i].id).html(data[i].text)
        );
    }
    $('#value').html($options).trigger('change');
});

Try to comment out the select2 part. The rest of the code will still work.

Appending a byte[] to the end of another byte[]

First you need to allocate an array of the combined length, then use arraycopy to fill it from both sources.

byte[] ciphertext = blah;
byte[] mac = blah;
byte[] out = new byte[ciphertext.length + mac.length];


System.arraycopy(ciphertext, 0, out, 0, ciphertext.length);
System.arraycopy(mac, 0, out, ciphertext.length, mac.length);

Difference between malloc and calloc?

from an article Benchmarking fun with calloc() and zero pages on Georg Hager's Blog

When allocating memory using calloc(), the amount of memory requested is not allocated right away. Instead, all pages that belong to the memory block are connected to a single page containing all zeroes by some MMU magic (links below). If such pages are only read (which was true for arrays b, c and d in the original version of the benchmark), the data is provided from the single zero page, which – of course – fits into cache. So much for memory-bound loop kernels. If a page gets written to (no matter how), a fault occurs, the “real” page is mapped and the zero page is copied to memory. This is called copy-on-write, a well-known optimization approach (that I even have taught multiple times in my C++ lectures). After that, the zero-read trick does not work any more for that page and this is why performance was so much lower after inserting the – supposedly redundant – init loop.

How to add an integer to each element in a list?

ASP.NET MVC3 Razor - Html.ActionLink style

Reviving an old question because it seems to appear at the top of search results.

I wanted to retain transition effects while still being able to style the actionlink so I came up with this solution.

I wrapped the action link with a div that would contain the parent style:

<div class="parent-style-one">
      @Html.ActionLink("Homepage", "Home", "Home")
</div>

Next I create the CSS for the div, this will be the parent css and will be inherited by the child elements such as the action link.

  .parent-style-one {
     /* your styles here */
  }

Because all an action link is, is an element when broken down as html so you just need to target that element in your css selection:

  .parent-style-one a {
     text-decoration: none;
  }

For transition effects I did this:

  .parent-style-one a:hover {
        text-decoration: underline;
        -webkit-transition-duration: 1.1s; /* Safari */
        transition-duration: 1.1s;         
  }

This way I only target the child elements of the div in this case the action link and still be able to apply transition effects.

How to get setuptools and easy_install?

please try to install the dependencie with pip, run this command:

sudo pip install -U setuptools

'float' vs. 'double' precision

float : 23 bits of significand, 8 bits of exponent, and 1 sign bit.

double : 52 bits of significand, 11 bits of exponent, and 1 sign bit.

load Js file in HTML

If this is your detail.html I don't see where do you load detail.js? Maybe this

<script src="js/index.js"></script>

should be this

<script src="js/detail.js"></script>

Where does Hive store files in HDFS?

Hive database is nothing but directories within HDFS with .db extensions.

So, from a Unix or Linux host which is connected to HDFS, search by following based on type of HDFS distribution:

hdfs dfs -ls -R / 2>/dev/null|grep db or hadoop fs -ls -R / 2>/dev/null|grep db

You will see full path of .db database directories. All tables will be residing under respective .db database directories.

How to compile C++ under Ubuntu Linux?

Update your apt-get:

$ sudo apt-get update
$ sudo apt-get install g++

Run your program.cpp:

$ g++ program.cpp
$ ./a.out

Android Studio emulator does not come with Play Store for API 23

Solved in easy way: You should create a new emulator, before opening it for the first time follow these 3 easy steps:

1- go to "C:\Users[user].android\avd[your virtual device folder]" open "config.ini" with text editor like notepad

2- change

"PlayStore.enabled=false" to "PlayStore.enabled=true"

3- change

"mage.sysdir.1 = system-images\android-30\google_apis\x86"

"image.sysdir.1 = system-images\android-30\google_apis_playstore\x86"

Storing C++ template function definitions in a .CPP file

This code is well-formed. You only have to pay attention that the definition of the template is visible at the point of instantiation. To quote the standard, § 14.7.2.4:

The definition of a non-exported function template, a non-exported member function template, or a non-exported member function or static data member of a class template shall be present in every translation unit in which it is explicitly instantiated.

How to create NSIndexPath for TableView

indexPathForRow is a class method!

The code should read:

NSIndexPath *myIP = [NSIndexPath indexPathForRow:0 inSection:0] ;

How to convert a file into a dictionary?

IMHO a bit more pythonic to use generators (probably you need 2.7+ for this):

with open('infile.txt') as fd:
    pairs = (line.split(None) for line in fd)
    res   = {int(pair[0]):pair[1] for pair in pairs if len(pair) == 2 and pair[0].isdigit()}

This will also filter out lines not starting with an integer or not containing exactly two items

How to create a file in Ruby

File.new and File.open default to read mode ('r') as a safety mechanism, to avoid possibly overwriting a file. We have to explicitly tell Ruby to use write mode ('w' is the most common way) if we're going to output to the file.

If the text to be output is a string, rather than write:

File.open('foo.txt', 'w') { |fo| fo.puts "bar" }

or worse:

fo = File.open('foo.txt', 'w')
fo.puts "bar"
fo.close

Use the more succinct write:

File.write('foo.txt', 'bar')

write has modes allowed so we can use 'w', 'a', 'r+' if necessary.

open with a block is useful if you have to compute the output in an iterative loop and want to leave the file open as you do so. write is useful if you are going to output the content in one blast then close the file.

See the documentation for more information.

How to add column if not exists on PostgreSQL?

You can do it by following way.

ALTER TABLE tableName drop column if exists columnName; 
ALTER TABLE tableName ADD COLUMN columnName character varying(8);

So it will drop the column if it is already exists. And then add the column to particular table.

How to create an empty file with Ansible?

A combination of two answers, with a twist. The code will be detected as changed, when the file is created or the permission updated.

- name: Touch again the same file, but dont change times this makes the task idempotent
  file:
    path: /etc/foo.conf
    state: touch
    mode: 0644
    modification_time: preserve
    access_time: preserve
  changed_when: >
    p.diff.before.state == "absent" or
    p.diff.before.mode|default("0644") != "0644"

and a version that also corrects the owner and group and detects it as changed when it does correct these:

- name: Touch again the same file, but dont change times this makes the task idempotent
  file:
    path: /etc/foo.conf
    state: touch
    state: touch
    mode: 0644
    owner: root
    group: root
    modification_time: preserve
    access_time: preserve
  register: p
  changed_when: >
    p.diff.before.state == "absent" or
    p.diff.before.mode|default("0644") != "0644" or
    p.diff.before.owner|default(0) != 0 or
    p.diff.before.group|default(0) != 0

Iterating C++ vector from the end to the beginning

Here's a super simple implementation that allows use of the for each construct and relies only on C++14 std library:

namespace Details {

    // simple storage of a begin and end iterator
    template<class T>
    struct iterator_range
    {
        T beginning, ending;
        iterator_range(T beginning, T ending) : beginning(beginning), ending(ending) {}

        T begin() const { return beginning; }
        T end() const { return ending; }
    };

}

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// usage:
//  for (auto e : backwards(collection))
template<class T>
auto backwards(T & collection)
{
    using namespace std;
    return Details::iterator_range(rbegin(collection), rend(collection));
}

This works with things that supply an rbegin() and rend(), as well as with static arrays.

std::vector<int> collection{ 5, 9, 15, 22 };
for (auto e : backwards(collection))
    ;

long values[] = { 3, 6, 9, 12 };
for (auto e : backwards(values))
    ;

How to truncate milliseconds off of a .NET DateTime

Regarding Diadistis response. This worked for me, except I had to use Floor to remove the fractional part of the division before the multiplication. So,

d = new DateTime((d.Ticks / TimeSpan.TicksPerSecond) * TimeSpan.TicksPerSecond);

becomes

d = new DateTime(Math.Floor(d.Ticks / TimeSpan.TicksPerSecond) * TimeSpan.TicksPerSecond);

I would have expected the division of two Long values to result in a Long, thus removing the decimal part, but it resolves it as a Double leaving the exact same value after the multiplication.

Eppsy

Convert Python dict into a dataframe

p.s. in particular, I've found Row-Oriented examples helpful; since often that how records are stored externally.

https://pbpython.com/pandas-list-dict.html

Git/GitHub can't push to master

There is a simple solution to this for someone new to this:

Edit the configuration file in your local .git directory (config). Change git: to https: below.

[remote "origin"]
    url = https://github.com/your_username/your_repo

Converting JSON String to Dictionary Not List

pass the data using javascript ajax from get methods

    **//javascript function    
    function addnewcustomer(){ 
    //This function run when button click
    //get the value from input box using getElementById
            var new_cust_name = document.getElementById("new_customer").value;
            var new_cust_cont = document.getElementById("new_contact_number").value;
            var new_cust_email = document.getElementById("new_email").value;
            var new_cust_gender = document.getElementById("new_gender").value;
            var new_cust_cityname = document.getElementById("new_cityname").value;
            var new_cust_pincode = document.getElementById("new_pincode").value;
            var new_cust_state = document.getElementById("new_state").value;
            var new_cust_contry = document.getElementById("new_contry").value;
    //create json or if we know python that is call dictionary.        
    var data = {"cust_name":new_cust_name, "cust_cont":new_cust_cont, "cust_email":new_cust_email, "cust_gender":new_cust_gender, "cust_cityname":new_cust_cityname, "cust_pincode":new_cust_pincode, "cust_state":new_cust_state, "cust_contry":new_cust_contry};
    //apply stringfy method on json
            data = JSON.stringify(data);
    //insert data into database using javascript ajax
            var send_data = new XMLHttpRequest();
            send_data.open("GET", "http://localhost:8000/invoice_system/addnewcustomer/?customerinfo="+data,true);
            send_data.send();

            send_data.onreadystatechange = function(){
              if(send_data.readyState==4 && send_data.status==200){
                alert(send_data.responseText);
              }
            }
          }

django views

    def addNewCustomer(request):
    #if method is get then condition is true and controller check the further line
        if request.method == "GET":
    #this line catch the json from the javascript ajax.
            cust_info = request.GET.get("customerinfo")
    #fill the value in variable which is coming from ajax.
    #it is a json so first we will get the value from using json.loads method.
    #cust_name is a key which is pass by javascript json. 
    #as we know json is a key value pair. the cust_name is a key which pass by javascript json
            cust_name = json.loads(cust_info)['cust_name']
            cust_cont = json.loads(cust_info)['cust_cont']
            cust_email = json.loads(cust_info)['cust_email']
            cust_gender = json.loads(cust_info)['cust_gender']
            cust_cityname = json.loads(cust_info)['cust_cityname']
            cust_pincode = json.loads(cust_info)['cust_pincode']
            cust_state = json.loads(cust_info)['cust_state']
            cust_contry = json.loads(cust_info)['cust_contry']
    #it print the value of cust_name variable on server
            print(cust_name)
            print(cust_cont)
            print(cust_email)
            print(cust_gender)
            print(cust_cityname)
            print(cust_pincode)
            print(cust_state)
            print(cust_contry)
            return HttpResponse("Yes I am reach here.")**

Android Dialog: Removing title bar

You can try this simple android dialog popup library. It is very simple to use on your activity.

When submit button is clicked try following code after including above lib in your code

Pop.on(this)
   .with()
   .title(R.string.title) //ignore if not needed
   .icon(R.drawable.icon) //ignore if not needed
   .cancelable(false) //ignore if not needed
   .layout(R.layout.custom_pop)
   .when(new Pop.Yah() {
       @Override
       public void clicked(DialogInterface dialog, View view) {
           Toast.makeText(getBaseContext(), "Yah button clicked", Toast.LENGTH_LONG).show();
       }
   }).show();

Add one line in your gradle and you good to go

dependencies {
    compile 'com.vistrav:pop:2.0'
}

Removing a Fragment from the back stack

You add to the back state from the FragmentTransaction and remove from the backstack using FragmentManager pop methods:

FragmentManager manager = getActivity().getSupportFragmentManager();
FragmentTransaction trans = manager.beginTransaction();
trans.remove(myFrag);
trans.commit();
manager.popBackStack();

Push Notifications in Android Platform

Firebase Cloud Messaging (FCM) is the new version of GCM. FCM is a cross-platform messaging solution that allows you to send messages securely and for free. Inherits GCM's central infrastructure to deliver messages reliably on Android, iOS, Web (javascript), Unity and C ++.

As of April 10, 2018, Google has disapproved of GCM. The GCM server and client APIs are deprecated and will be removed on April 11, 2019. Google recommends migrating GCM applications to Firebase Cloud Messaging (FCM), which inherits the reliable and scalable GCM infrastructure.

Resource

How do you make an element "flash" in jQuery

Would a ~~pulse effect~~(offline) JQuery plugin be appropriate for what you are looking for ?

You can add a duration for limiting the pulse effect in time.

As mentioned by J-P in the comments, there is now his updated pulse plugin.
See his GitHub repo. And here is a demo.

What is the difference between Linear search and Binary search?

For a clear understanding, please take a look at my codepen implementations https://codepen.io/serdarsenay/pen/XELWqN

Biggest difference is the need to sort your sample before applying binary search, therefore for most "normal sized" (meaning to be argued) samples will be quicker to search with a linear search algorithm.

Here is the javascript code, for html and css and full running example please refer to above codepen link.

var unsortedhaystack = [];
var haystack = [];
function init() {
  unsortedhaystack = document.getElementById("haystack").value.split(' ');
}
function sortHaystack() {
  var t = timer('sort benchmark');
  haystack = unsortedhaystack.sort();
  t.stop();
}

var timer = function(name) {
    var start = new Date();
    return {
        stop: function() {
            var end  = new Date();
            var time = end.getTime() - start.getTime();
            console.log('Timer:', name, 'finished in', time, 'ms');
        }
    }
};

function lineerSearch() {
  init();
  var t = timer('lineerSearch benchmark');
  var input = this.event.target.value;
  for(var i = 0;i<unsortedhaystack.length - 1;i++) {
    if (unsortedhaystack[i] === input) {
      document.getElementById('result').innerHTML = 'result is... "' + unsortedhaystack[i] + '", on index: ' + i + ' of the unsorted array. Found' + ' within ' + i + ' iterations';
      console.log(document.getElementById('result').innerHTML);
      t.stop(); 
      return unsortedhaystack[i]; 
    }
  }
}

function binarySearch () {
  init();
  sortHaystack();
  var t = timer('binarySearch benchmark');
  var firstIndex = 0;
  var lastIndex = haystack.length-1;
  var input = this.event.target.value;

  //currently point in the half of the array
  var currentIndex = (haystack.length-1)/2 | 0;
  var iterations = 0;

  while (firstIndex <= lastIndex) {
    currentIndex = (firstIndex + lastIndex)/2 | 0;
    iterations++;
    if (haystack[currentIndex]  < input) {
      firstIndex = currentIndex + 1;
      //console.log(currentIndex + " added, fI:"+firstIndex+", lI: "+lastIndex);
    } else if (haystack[currentIndex] > input) {
      lastIndex = currentIndex - 1;
      //console.log(currentIndex + " substracted, fI:"+firstIndex+", lI: "+lastIndex);
    } else {
      document.getElementById('result').innerHTML = 'result is... "' + haystack[currentIndex] + '", on index: ' + currentIndex + ' of the sorted array. Found' + ' within ' + iterations + ' iterations';
      console.log(document.getElementById('result').innerHTML);
      t.stop(); 
      return true;
    }
  }
}

How Do I Convert an Integer to a String in Excel VBA?

If you have a valid integer value and your requirement is to compare values, you can simply go ahead with the comparison as seen below.

Sub t()

Dim i As Integer
Dim s  As String

' pass
i = 65
s = "65"
If i = s Then
MsgBox i
End If

' fail - Type Mismatch
i = 65
s = "A"
If i = s Then
MsgBox i
End If
End Sub

How to animate the change of image in an UIImageView?

Why not try this.

NSArray *animationFrames = [NSArray arrayWithObjects:
  [UIImage imageWithName:@"image1.png"],
  [UIImage imageWithName:@"image2.png"], 
  nil];

UIImageView *animatedImageView = [[UIImageView alloc] init];
animatedImageView.animationImages = animationsFrame;
[animatedImageView setAnimationRepeatCount:1];
[animatedImageView startAnimating];

A swift version:

let animationsFrames = [UIImage(named: "image1.png"), UIImage(named: "image2.png")]
let animatedImageView = UIImageView()
animatedImageView.animationImages = animationsFrames
animatedImageView.animationRepeatCount = 1
animatedImageView.startAnimating()

Getting hold of the outer class object from the inner class object

/**
 * Not applicable to Static Inner Class (nested class)
 */
public static Object getDeclaringTopLevelClassObject(Object object) {
    if (object == null) {
        return null;
    }
    Class cls = object.getClass();
    if (cls == null) {
        return object;
    }
    Class outerCls = cls.getEnclosingClass();
    if (outerCls == null) {
        // this is top-level class
        return object;
    }
    // get outer class object
    Object outerObj = null;
    try {
        Field[] fields = cls.getDeclaredFields();
        for (Field field : fields) {
            if (field != null && field.getType() == outerCls
                    && field.getName() != null && field.getName().startsWith("this$")) {
                field.setAccessible(true);
                outerObj = field.get(object);
                break;
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    return getDeclaringTopLevelClassObject(outerObj);
}

Of course, the name of the implicit reference is unreliable, so you shouldn't use reflection for the job.

Comparing two java.util.Dates to see if they are in the same day

Convert dates to Java 8 java.time.LocalDate as seen here.

LocalDate localDate1 = date1.toInstant().atZone(ZoneId.systemDefault()).toLocalDate();
LocalDate localDate2 = date2.toInstant().atZone(ZoneId.systemDefault()).toLocalDate();

// compare dates
assertTrue("Not on the same day", localDate1.equals(localDate2));

What's the difference between interface and @interface in java?

interface in the Java programming language is an abstract type that is used to specify a behavior that classes must implement. They are similar to protocols. Interfaces are declared using the interface keyword

@interface is used to create your own (custom) Java annotations. Annotations are defined in their own file, just like a Java class or interface. Here is custom Java annotation example:

@interface MyAnnotation {

    String   value();

    String   name();
    int      age();
    String[] newNames();

}

This example defines an annotation called MyAnnotation which has four elements. Notice the @interface keyword. This signals to the Java compiler that this is a Java annotation definition.

Notice that each element is defined similarly to a method definition in an interface. It has a data type and a name. You can use all primitive data types as element data types. You can also use arrays as data type. You cannot use complex objects as data type.

To use the above annotation, you could use code like this:

@MyAnnotation(
    value="123",
    name="Jakob",
    age=37,
    newNames={"Jenkov", "Peterson"}
)
public class MyClass {


}

Reference - http://tutorials.jenkov.com/java/annotations.html

How to assign a select result to a variable?

DECLARE @tmp_key int
DECLARE @get_invckey cursor 

SET @get_invckey = CURSOR FOR 
    SELECT invckey FROM tarinvoice WHERE confirmtocntctkey IS NULL AND tranno LIKE '%115876'

OPEN @get_invckey 

FETCH NEXT FROM @get_invckey INTO @tmp_key

DECLARE @PrimaryContactKey int --or whatever datatype it is

WHILE (@@FETCH_STATUS = 0) 
BEGIN 
    SELECT @PrimaryContactKey=c.PrimaryCntctKey
    FROM tarcustomer c, tarinvoice i
    WHERE i.custkey = c.custkey AND i.invckey = @tmp_key

    UPDATE tarinvoice SET confirmtocntctkey = @PrimaryContactKey WHERE invckey = @tmp_key
    FETCH NEXT FROM @get_invckey INTO @tmp_key
END 

CLOSE @get_invckey
DEALLOCATE @get_invckey

EDIT:
This question has gotten a lot more traction than I would have anticipated. Do note that I'm not advocating the use of the cursor in my answer, but rather showing how to assign the value based on the question.

What is .htaccess file?

.htaccess is a configuration file for use on web servers running the Apache Web Server software.

When a .htaccess file is placed in a directory which is in turn 'loaded via the Apache Web Server', then the .htaccess file is detected and executed by the Apache Web Server software.

These .htaccess files can be used to alter the configuration of the Apache Web Server software to enable/disable additional functionality and features that the Apache Web Server software has to offer.

These facilities include basic redirect functionality, for instance if a 404 file not found error occurs, or for more advanced functions such as content password protection or image hot link prevention.

Whenever any request is sent to the server it always passes through .htaccess file. There are some rules are defined to instruct the working.

Is there a way to instantiate a class by name in Java?

Class.forName("ClassName") will solve your purpose.

Class class1 = Class.forName(ClassName);
Object object1 = class1.newInstance();

How do I do a bulk insert in mySQL using node.js

Few things I want to mention is that I'm using mysql package for making a connection with my database and what you saw below is working code and written for insert bulk query.

const values = [
  [1, 'DEBUG', 'Something went wrong. I have to debug this.'],
  [2, 'INFO', 'This just information to end user.'],
  [3, 'WARNING', 'Warning are really helping users.'],
  [4, 'SUCCESS', 'If everything works then your request is successful']
];

const query = "INSERT INTO logs(id, type, desc) VALUES ?";

const query = connection.query(query, [values], function(err, result) {
  if (err) {
    console.log('err', err)
  }

  console.log('result', result)
});

Get HTML5 localStorage keys

function listAllItems(){  
    for (i=0; i<localStorage.length; i++)  
    {  
        key = localStorage.key(i);  
        alert(localStorage.getItem(key));
    }  
}

Django - Did you forget to register or load this tag?

For Django 2.2 up to 3, you have to load staticfiles in html template first before use static keyword

{% load staticfiles %}
<link rel="stylesheet" href="{% static 'css/bootstrap.min.css' %}">

For other versions use static

{% load static %}
<link rel="stylesheet" href="{% static 'css/bootstrap.min.css' %}">

Also you have to check that you defined STATIC_URL in setting.py

At last, make sure the static files exist in the defined folder

Generating a UUID in Postgres for Insert statement?

PostgreSQL 13 supports natively gen_random_uuid ():

PostgreSQL includes one function to generate a UUID:
gen_random_uuid () ? uuid
This function returns a version 4 (random) UUID. This is the most commonly used type of UUID and is appropriate for most applications.

db<>fiddle demo

How do I declare a model class in my Angular 2 component using TypeScript?

my code is

    import { Component } from '@angular/core';

class model {
  username : string;
  password : string;
}

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})



export class AppComponent {

 username : string;
 password : string;
  usermodel = new model();

  login(){
  if(this.usermodel.username == "admin"){
    alert("hi");
  }else{
    alert("bye");
    this.usermodel.username = "";
  }    
  }
}

and the html goes like this :

<div class="login">
  Usernmae : <input type="text" [(ngModel)]="usermodel.username"/>
  Password : <input type="text" [(ngModel)]="usermodel.password"/>
  <input type="button" value="Click Me" (click)="login()" />
</div>

Run .php file in Windows Command Prompt (cmd)

If running Windows 10:

Open the start menu
Type path
Click Edit the system environment variables (usually, it's the top search result) and continue on step 6 below.

If on older Windows:

Show Desktop.
Right Click My Computer shortcut in the desktop.
Click Properties.
You should see a section of control Panel - Control Panel\System and Security\System.
Click Advanced System Settings on the Left menu.
Click Enviornment Variables towards the bottom of the System Properties window.
Select PATH in the user variables list.
Append your PHP Path (C:\myfolder\php) to your PATH variable, separated from the already existing string by a semi colon.
Click OK
Open your "cmd"
Type PATH, press enter
Make sure that you see your PHP folder among the list.

That should work.

Note: Make sure that your PHP folder has the php.exe. It should have the file type CLI. If you do not have the php.exe, go ahead and check the installation guidelines at - http://www.php.net/manual/en/install.windows.manual.php - and download the installation file from there.

Appending to list in Python dictionary

list.append returns None, since it is an in-place operation and you are assigning it back to dates_dict[key]. So, the next time when you do dates_dict.get(key, []).append you are actually doing None.append. That is why it is failing. Instead, you can simply do

dates_dict.setdefault(key, []).append(date)

But, we have collections.defaultdict for this purpose only. You can do something like this

from collections import defaultdict
dates_dict = defaultdict(list)
for key, date in cur:
    dates_dict[key].append(date)

This will create a new list object, if the key is not found in the dictionary.

Note: Since the defaultdict will create a new list if the key is not found in the dictionary, this will have unintented side-effects. For example, if you simply want to retrieve a value for the key, which is not there, it will create a new list and return it.

How to create an Excel File with Nodejs?

Use msexcel-builder. Install it with:

npm install msexcel-builder

Then:

// Create a new workbook file in current working-path 
var workbook = excelbuilder.createWorkbook('./', 'sample.xlsx')

// Create a new worksheet with 10 columns and 12 rows 
var sheet1 = workbook.createSheet('sheet1', 10, 12);

// Fill some data 
sheet1.set(1, 1, 'I am title');
for (var i = 2; i < 5; i++)
  sheet1.set(i, 1, 'test'+i);

// Save it 
workbook.save(function(ok){
  if (!ok) 
    workbook.cancel();
  else
    console.log('congratulations, your workbook created');
});

setBackground vs setBackgroundDrawable (Android)

Now you can use either of those options. And it is going to work in any case. Your color can be a HEX code, like this:

myView.setBackgroundResource(ContextCompat.getColor(context, Color.parseColor("#FFFFFF")));

A color resource, like this:

myView.setBackgroundResource(ContextCompat.getColor(context,R.color.blue_background));

Or a custom xml resource, like so:

myView.setBackgroundResource(R.drawable.my_custom_background);

Hope it helps!

Sorting 1 million 8-decimal-digit numbers with 1 MB of RAM

There are 10^6 values in a range of 10^8, so there's one value per hundred code points on average. Store the distance from the Nth point to the (N+1)th. Duplicate values have a skip of 0. This means that the skip needs an average of just under 7 bits to store, so a million of them will happily fit into our 8 million bits of storage.

These skips need to be encoded into a bitstream, say by Huffman encoding. Insertion is by iterating through the bitstream and rewriting after the new value. Output by iterating through and writing out the implied values. For practicality, it probably wants to be done as, say, 10^4 lists covering 10^4 code points (and an average of 100 values) each.

A good Huffman tree for random data can be built a priori by assuming a Poisson distribution (mean=variance=100) on the length of the skips, but real statistics can be kept on the input and used to generate an optimal tree to deal with pathological cases.

Slicing a dictionary

Use a set to intersect on the dict.viewkeys() dictionary view:

l = {1, 5}
{key: d[key] for key in d.viewkeys() & l}

This is Python 2 syntax, in Python 3 use d.keys().

This still uses a loop, but at least the dictionary comprehension is a lot more readable. Using set intersections is very efficient, even if d or l is large.

Demo:

>>> d = {1:2, 3:4, 5:6, 7:8}
>>> l = {1, 5}
>>> {key: d[key] for key in d.viewkeys() & l}
{1: 2, 5: 6}

Java ByteBuffer to String

EDIT (2018): The edited sibling answer by @xinyongCheng is a simpler approach, and should be the accepted answer.

Your approach would be reasonable if you knew the bytes are in the platform's default charset. In your example, this is true because k.getBytes() returns the bytes in the platform's default charset.

More frequently, you'll want to specify the encoding. However, there's a simpler way to do that than the question you linked. The String API provides methods that converts between a String and a byte[] array in a particular encoding. These methods suggest using CharsetEncoder/CharsetDecoder "when more control over the decoding [encoding] process is required."

To get the bytes from a String in a particular encoding, you can use a sibling getBytes() method:

byte[] bytes = k.getBytes( StandardCharsets.UTF_8 );

To put bytes with a particular encoding into a String, you can use a different String constructor:

String v = new String( bytes, StandardCharsets.UTF_8 );

Note that ByteBuffer.array() is an optional operation. If you've constructed your ByteBuffer with an array, you can use that array directly. Otherwise, if you want to be safe, use ByteBuffer.get(byte[] dst, int offset, int length) to get bytes from the buffer into a byte array.

Convert PDF to clean SVG?

Here is the NodeJS REST api for two PDF render scripts. https://github.com/pumppi/pdf2images

Scripts are: pdf2svg and Imagemagicks convert

Do we have router.reload in vue-router?

Use router.go(0) if you use Typescript, and it's asking arguments for the go method.

Convert 4 bytes to int

The easiest way is:

RandomAccessFile in = new RandomAccessFile("filename", "r"); 
int i = in.readInt();

-- or --

DataInputStream in = new DataInputStream(new BufferedInputStream(
    new FileInputStream("filename"))); 
int i = in.readInt();

NumPy first and last element from array

How about:

In [10]: arr = numpy.array([1,23,4,6,7,8])

In [11]: [(arr[i], arr[-i-1]) for i in range(len(arr) // 2)]
Out[11]: [(1, 8), (23, 7), (4, 6)]

Depending on the size of arr, writing the entire thing in NumPy may be more performant:

In [41]: arr = numpy.array([1,23,4,6,7,8]*100)

In [42]: %timeit [(arr[i], arr[-i-1]) for i in range(len(arr) // 2)]
10000 loops, best of 3: 167 us per loop

In [43]: %timeit numpy.vstack((arr, arr[::-1]))[:,:len(arr)//2]
100000 loops, best of 3: 16.4 us per loop

Finding three elements in an array whose sum is closest to a given number

Here is the C++ code:

bool FindSumZero(int a[], int n, int& x, int& y, int& z)
{
    if (n < 3)
        return false;

    sort(a, a+n);

    for (int i = 0; i < n-2; ++i)
    {
        int j = i+1;
        int k = n-1;

        while (k >= j)
        {
            int s = a[i]+a[j]+a[k];

            if (s == 0 && i != j && j != k && k != i)
            {
                x = a[i], y = a[j], z = a[k];
                return true;
            }

            if (s > 0)
                --k;
            else
                ++j;
        }
    }

    return false;
}

How can I get an int from stdio in C?

The solution is quite simple ... you're reading getchar() which gives you the first character in the input buffer, and scanf just parsed it (really don't know why) to an integer, if you just forget the getchar for a second, it will read the full buffer until a newline char.

printf("> ");
int x;
scanf("%d", &x);
printf("got the number: %d", x);

Outputs

> [prompt expecting input, lets write:] 1234 [Enter]
got the number: 1234

HTML how to clear input using javascript?

<script type="text/javascript">
    function clearThis(target){
        if(target.value=='[email protected]'){
        target.value= "";}
    }
    </script>

Is this really what your looking for?

Datatable vs Dataset

When you are only dealing with a single table anyway, the biggest practical difference I have found is that DataSet has a "HasChanges" method but DataTable does not. Both have a "GetChanges" however, so you can use that and test for null.

How to give a pandas/matplotlib bar graph custom colors

For a more detailed answer on creating your own colormaps, I highly suggest visiting this page

If that answer is too much work, you can quickly make your own list of colors and pass them to the color parameter. All the colormaps are in the cm matplotlib module. Let's get a list of 30 RGB (plus alpha) color values from the reversed inferno colormap. To do so, first get the colormap and then pass it a sequence of values between 0 and 1. Here, we use np.linspace to create 30 equally-spaced values between .4 and .8 that represent that portion of the colormap.

from matplotlib import cm
color = cm.inferno_r(np.linspace(.4, .8, 30))
color

array([[ 0.865006,  0.316822,  0.226055,  1.      ],
       [ 0.851384,  0.30226 ,  0.239636,  1.      ],
       [ 0.832299,  0.283913,  0.257383,  1.      ],
       [ 0.817341,  0.270954,  0.27039 ,  1.      ],
       [ 0.796607,  0.254728,  0.287264,  1.      ],
       [ 0.775059,  0.239667,  0.303526,  1.      ],
       [ 0.758422,  0.229097,  0.315266,  1.      ],
       [ 0.735683,  0.215906,  0.330245,  1.      ],
       .....

Then we can use this to plot, using the data from the original post:

import random
x = [{i: random.randint(1, 5)} for i in range(30)]
df = pd.DataFrame(x)
df.plot(kind='bar', stacked=True, color=color, legend=False, figsize=(12, 4))

What EXACTLY is meant by "de-referencing a NULL pointer"?

A NULL pointer points to memory that doesn't exist. This may be address 0x00000000 or any other implementation-defined value (as long as it can never be a real address). Dereferencing it means trying to access whatever is pointed to by the pointer. The * operator is the dereferencing operator:

int a, b, c; // some integers
int *pi;     // a pointer to an integer

a = 5;
pi = &a; // pi points to a
b = *pi; // b is now 5
pi = NULL;
c = *pi; // this is a NULL pointer dereference

This is exactly the same thing as a NullReferenceException in C#, except that pointers in C can point to any data object, even elements inside an array.

MySql ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

Try this (on Windows, i don't know how in others), if you have changed password a now don't work.

1) kill mysql 2) back up /mysql/data folder 3) go to folder /mysql/backup 4) copy files from /mysql/backup/mysql folder to /mysql/data/mysql (rewrite) 5) run mysql

In my XAMPP on Win7 it works.

How can I specify a local gem in my Gemfile?

In order to use local gem repository in a Rails project, follow the steps below:

Check if your gem folder is a git repository (the command is executed in the gem folder)
```
git rev-parse --is-inside-work-tree
```
Getting repository path (the command is executed in the gem folder)
```
git rev-parse --show-toplevel
```
Setting up a local override for the rails application
```
bundle config local.GEM_NAME /path/to/local/git/repository
```
where GEM_NAME is the name of your gem and /path/to/local/git/repository is the output of the command in point 2

In your application Gemfile add the following line:

gem 'GEM_NAME', :github => 'GEM_NAME/GEM_NAME', :branch => 'master'

Running bundle install should give something like this:
```
Using GEM_NAME (0.0.1) from git://github.com/GEM_NAME/GEM_NAME.git (at /path/to/local/git/repository) 
```
where GEM_NAME is the name of your gem and /path/to/local/git/repository from point 2
Finally, run bundle list, not gem list and you should see something like this:
```
GEM_NAME (0.0.1 5a68b88)
```
where GEM_NAME is the name of your gem

A few important cases I am observing using:

Rails 4.0.2  
ruby 2.0.0p247 (2013-06-27 revision 41674) [x86_64-linux] 
Ubuntu 13.10  
RubyMine 6.0.3

It seems RubyMine is not showing local gems as an external library. More information about the bug can be found here and here
When I am changing something in the local gem, in order to be loaded in the rails application I should stop/start the rails server
If I am changing the version of the gem, stopping/starting the Rails server gives me an error. In order to fix it, I am specifying the gem version in the rails application Gemfile like this:
```
gem 'GEM_NAME', '0.0.2', :github => 'GEM_NAME/GEM_NAME', :branch => 'master'
```

The module ".dll" was loaded but the entry-point was not found

I had this problem and

dumpbin /exports mydll.dll

and

depends mydll.dll

showed 'DllRegisterServer'.

The problem was that there was another DLL in the system that had the same name. After renaming mydll the registration succeeded.

Can't get Gulp to run: cannot find module 'gulp-util'

I had the same issue, although the module that it was downloading was different. The only resolution to the problem is run the below command again:

npm install

Convert bytes to int?

Lists of bytes are subscriptable (at least in Python 3.6). This way you can retrieve the decimal value of each byte individually.

>>> intlist = [64, 4, 26, 163, 255]
>>> bytelist = bytes(intlist)       # b'@x04\x1a\xa3\xff'

>>> for b in bytelist:
...    print(b)                     # 64  4  26  163  255

>>> [b for b in bytelist]           # [64, 4, 26, 163, 255]

>>> bytelist[2]                     # 26

Why does JSHint throw a warning if I am using const?

I got this same warning when using an export statement. I'm using VS Code and used a similar approach to Wenlong Jiang's solution.

User Settings
JSHint config
"jshint.config": {} (Edit)
Use double quotes when specifying "esversion"

Or copy this snippet into User Settings:
```
"jshint.options": {
  "esversion": 6,
}
```

Creating a .jshintrc file isn't necessary if you want to configure the global jshint settings for your editor

Convert a List<T> into an ObservableCollection<T>

ObservableCollection < T > has a constructor overload which takes IEnumerable < T >

Example for a List of int:

ObservableCollection<int> myCollection = new ObservableCollection<int>(myList);

One more example for a List of ObjectA:

ObservableCollection<ObjectA> myCollection = new ObservableCollection<ObjectA>(myList as List<ObjectA>);

How to replace a string in multiple files in linux command line

Similar to Kaspar's answer but with the g flag to replace all the occurrences on a line.

find ./ -type f -exec sed -i 's/string1/string2/g' {} \;

For global case insensitive:

find ./ -type f -exec sed -i 's/string1/string2/gI' {} \;

Problems with Android Fragment back stack

I know it's a old quetion but i got the same problem and fix it like this:

First, Add Fragment1 to BackStack with a name (e.g "Frag1"):

frag = new Fragment1();

transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.detailFragment, frag);
transaction.addToBackStack("Frag1");
transaction.commit();

And then, Whenever you want to go back to Fragment1 (even after adding 10 fragments above it), just call popBackStackImmediate with the name:

getSupportFragmentManager().popBackStackImmediate("Frag1", 0);

Hope it will help someone :)

What's the difference between INNER JOIN, LEFT JOIN, RIGHT JOIN and FULL JOIN?

INNER JOIN gets all records that are common between both tables based on the supplied ON clause.

LEFT JOIN gets all records from the LEFT linked and the related record from the right table ,but if you have selected some columns from the RIGHT table, if there is no related records, these columns will contain NULL.

RIGHT JOIN is like the above but gets all records in the RIGHT table.

FULL JOIN gets all records from both tables and puts NULL in the columns where related records do not exist in the opposite table.

How do I generate a random int number?

create a Random object

Random rand = new Random();

and use it

int randomNumber = rand.Next(min, max);

you don't have to initialize new Random() every time you need a random number, initiate one Random then use it as many times as you need inside a loop or whatever

Javascript - Replace html using innerHTML

You should chain the replace() together instead of assigning the result and replacing again.

var strMessage1 = document.getElementById("element1") ;
strMessage1.innerHTML = strMessage1.innerHTML
                        .replace(/aaaaaa./g,'<a href=\"http://www.google.com/')
                        .replace(/.bbbbbb/g,'/world\">Helloworld</a>');

See DEMO.

VB.NET: how to prevent user input in a ComboBox

Private Sub ComboBox4_KeyPress(sender As Object, e As KeyPressEventArgs) Handles ComboBox4.KeyPress
    e.keyChar = string.empty
End Sub

proper name for python * operator?

For a colloquial name there is "splatting".

For arguments (list type) you use single * and for keyword arguments (dictionary type) you use double **.

Both * and ** is sometimes referred to as "splatting".

See for reference of this name being used: https://stackoverflow.com/a/47875892/14305096

iPhone Navigation Bar Title text color

to set font size of title i have used following conditions.. maybe helpfull to anybody

if ([currentTitle length]>24) msize = 10.0f;
    else if ([currentTitle length]>16) msize = 14.0f;
    else if ([currentTitle length]>12) msize = 18.0f;

Center image in table td in CSS

Simple way to do it for html5 in css:

td img{
    display: block;
    margin-left: auto;
    margin-right: auto;

}

Worked for me perfectly.

What difference is there between WebClient and HTTPWebRequest classes in .NET?

WebClient is a higher-level abstraction built on top of HttpWebRequest to simplify the most common tasks. For instance, if you want to get the content out of an HttpWebResponse, you have to read from the response stream:

var http = (HttpWebRequest)WebRequest.Create("http://example.com");
var response = http.GetResponse();

var stream = response.GetResponseStream();
var sr = new StreamReader(stream);
var content = sr.ReadToEnd();

With WebClient, you just do DownloadString:

var client = new WebClient();
var content = client.DownloadString("http://example.com");

Note: I left out the using statements from both examples for brevity. You should definitely take care to dispose your web request objects properly.

In general, WebClient is good for quick and dirty simple requests and HttpWebRequest is good for when you need more control over the entire request.

How to check if PHP array is associative or sequential?

function isAssoc($arr)
{
    $a = array_keys($arr);
    for($i = 0, $t = count($a); $i < $t; $i++)
    {
        if($a[$i] != $i)
        {
            return false;
        }
    }
    return true;
}

Basic example for sharing text or image with UIActivityViewController in Swift

I found this to work flawlessly if you want to share whole screen.

@IBAction func shareButton(_ sender: Any) {

    let bounds = UIScreen.main.bounds
    UIGraphicsBeginImageContextWithOptions(bounds.size, true, 0.0)
    self.view.drawHierarchy(in: bounds, afterScreenUpdates: false)
    let img = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    let activityViewController = UIActivityViewController(activityItems: [img!], applicationActivities: nil)
    activityViewController.popoverPresentationController?.sourceView = self.view
    self.present(activityViewController, animated: true, completion: nil)
}

symfony2 : failed to write cache directory

if symfony version less than 2.8

_x000D_

sudo chmod -R 777 app/cache/*

_x000D_

if symfony version great than or equal 3.0

_x000D_

sudo chmod -R 777 var/cache/*

_x000D_

How many characters can you store with 1 byte?

The syntax of TINYINT data type is TINYINT(M),

where M indicates the maximum display width (used only if your MySQL client supports it).

The (m) indicates the column width in SELECT statements; however, it doesn't control the accepted range of numbers for that field.

A TINYINT is an 8-bit integer value, a BIT field can store between 1 bit, BIT(1), and 64 >bits, BIT(64). For a boolean values, BIT(1) is pretty common.

TINYINT()

Case-Insensitive List Search

Based on Adam Sills answer above - here's a nice clean extensions method for Contains... :)

///----------------------------------------------------------------------
/// <summary>
/// Determines whether the specified list contains the matching string value
/// </summary>
/// <param name="list">The list.</param>
/// <param name="value">The value to match.</param>
/// <param name="ignoreCase">if set to <c>true</c> the case is ignored.</param>
/// <returns>
///   <c>true</c> if the specified list contais the matching string; otherwise, <c>false</c>.
/// </returns>
///----------------------------------------------------------------------
public static bool Contains(this List<string> list, string value, bool ignoreCase = false)
{
    return ignoreCase ?
        list.Any(s => s.Equals(value, StringComparison.OrdinalIgnoreCase)) :
        list.Contains(value);
}

How to disable Paste (Ctrl+V) with jQuery?

This now works for IE FF Chrome properly... I have not tested for other browsers though

$(document).ready(function(){
   $('#txtInput').on("cut copy paste",function(e) {
      e.preventDefault();
   });
});

Edit: As pointed out by webeno, .bind() is deprecated hence it is recommended to use .on() instead.

Undefined reference to vtable

In my case I'm using Qt and had defined a QObject subclass in a foo.cpp (not .h) file. The fix was to add #include "foo.moc" at the end of foo.cpp.

How to remove the first and the last character of a string

Here you go

_x000D_

var yourString = "/installers/";_x000D_
var result = yourString.substring(1, yourString.length-1);_x000D_
_x000D_
console.log(result);

_x000D_

Or you can use .slice as suggested by Ankit Gupta

_x000D_

var yourString = "/installers/services/";_x000D_
_x000D_
var result = yourString.slice(1,-1);_x000D_
_x000D_
console.log(result);

_x000D_

Documentation for the slice and substring.

C# find biggest number

Here is the simple logic to find Biggest/Largest Number

Input : 11, 33, 1111, 4, 0 Output : 1111

namespace PurushLogics
{
    class Purush_BiggestNumber
    {
        static void Main()
        {
            int count = 0;
            Console.WriteLine("Enter Total Number of Integers\n");
            count = int.Parse(Console.ReadLine());

            int[] numbers = new int[count];

            Console.WriteLine("Enter the numbers"); // Input 44, 55, 111, 2 Output = "111"
            for (int temp = 0; temp < count; temp++)
            {
                numbers[temp] = int.Parse(Console.ReadLine());
            }

            int largest = numbers[0];
            for (int big = 1; big < numbers.Length; big++)
            {
                if (largest < numbers[big])
                {
                    largest = numbers[big];
                }
            }
            Console.WriteLine(largest);
            Console.ReadKey();
        }
    }
}

showDialog deprecated. What's the alternative?

package com.keshav.datePicker_With_Hide_Future_Past_Date;

import android.app.DatePickerDialog;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.DatePicker;
import android.widget.EditText;

import java.util.Calendar;

public class MainActivity extends AppCompatActivity {

    EditText ed_date;
    int year;
    int month;
    int day;

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

        ed_date=(EditText) findViewById(R.id.et_date);

        ed_date.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                Calendar mcurrentDate=Calendar.getInstance();
                year=mcurrentDate.get(Calendar.YEAR);
                month=mcurrentDate.get(Calendar.MONTH);
                day=mcurrentDate.get(Calendar.DAY_OF_MONTH);

                final DatePickerDialog   mDatePicker =new DatePickerDialog(MainActivity.this, new DatePickerDialog.OnDateSetListener()
                {
                    @Override
                    public void onDateSet(DatePicker datepicker, int selectedyear, int selectedmonth, int selectedday)
                    {
                              ed_date.setText(new StringBuilder().append(year).append("-").append(month+1).append("-").append(day));
                            int month_k=selectedmonth+1;

                    }
                },year, month, day);
                mDatePicker.setTitle("Please select date");
                // TODO Hide Future Date Here
                mDatePicker.getDatePicker().setMaxDate(System.currentTimeMillis());

                // TODO Hide Past Date Here
                //  mDatePicker.getDatePicker().setMinDate(System.currentTimeMillis());
                mDatePicker.show();
            }
        });
    }
}


// Its Working

Node.js Web Application examples/tutorials

The Node Knockout competition wrapped up recently, and many of the submissions are available on github. The competition site doesn't appear to be working right now, but I'm sure you could Google up a few entries to check out.

eloquent laravel: How to get a row count from a ->get()

also, you can fetch all data and count in the blade file. for example:

your code in the controller

$posts = Post::all();
return view('post', compact('posts'));

your code in the blade file.

{{ $posts->count() }}

finally, you can see the total of your posts.

php execute a background process

If using PHP there is a much easier way to do this using pcntl_fork:

http://www.php.net/manual/en/function.pcntl-fork.php

Error creating bean with name 'entityManagerFactory

Adding dependencies didn't fix the issue at my end.

The issue was happening at my end because of "additional" fields that are part of the "@Entity" class and don't exist in the database.

I removed the additional fields from the @Entity class and it worked.

JavaScript: replace last occurrence of text in a string

Old fashioned and big code but efficient as possible:

function replaceLast(origin,text){
    textLenght = text.length;
    originLen = origin.length
    if(textLenght == 0)
        return origin;

    start = originLen-textLenght;
    if(start < 0){
        return origin;
    }
    if(start == 0){
        return "";
    }
    for(i = start; i >= 0; i--){
        k = 0;
        while(origin[i+k] == text[k]){
            k++
            if(k == textLenght)
                break;
        }
        if(k == textLenght)
            break;
    }
    //not founded
    if(k != textLenght)
        return origin;

    //founded and i starts on correct and i+k is the first char after
    end = origin.substring(i+k,originLen);
    if(i == 0)
        return end;
    else{
        start = origin.substring(0,i) 
        return (start + end);
    }
}

Insert Picture into SQL Server 2005 Image Field using only SQL

I achieved the goal where I have multiple images to insert in the DB as

INSERT INTO [dbo].[User]
           ([Name]
           ,[Image1]
           ,[Age]
           ,[Image2]
           ,[GroupId]
           ,[GroupName])
           VALUES
           ('Umar'
           , (SELECT BulkColumn 
            FROM Openrowset( Bulk 'path-to-file.jpg', Single_Blob) as Image1)
           ,26
           ,(SELECT BulkColumn 
            FROM Openrowset( Bulk 'path-to-file.jpg', Single_Blob) as Image2)
            ,'Group123'
           ,'GroupABC')

How to execute my SQL query in CodeIgniter

http://www.bsourcecode.com/codeigniter/codeigniter-select-query/

$query = $this->db->query("select * from tbl_user");

OR

$query = $this->db->select("*");
            $this->db->from('table_name');
            $query=$this->db->get();

How to have Ellipsis effect on Text

To Achieve ellipses for the text use the Text property numberofLines={1} which will automatically truncate the text with an ellipsis you can specify the ellipsizeMode as "head", "middle", "tail" or "clip" By default it is tail

https://reactnative.dev/docs/text#ellipsizemode

Compare two dates with JavaScript

You can date compare as most simple and understandable way like.

<input type="date" id="getdate1" />
<input type="date" id="getdate2" />

let suppose you have two date input you want to compare them.

so firstly write a common method to parse date.

 <script type="text/javascript">
            function parseDate(input) {
             var datecomp= input.split('.'); //if date format 21.09.2017

              var tparts=timecomp.split(':');//if time also giving
              return new Date(dparts[2], dparts[1]-1, dparts[0], tparts[0], tparts[1]);
// here new date(  year, month, date,)
            }
        </script>

parseDate() is the make common method for parsing the date. now you can checks your date =, > ,< any type of compare

    <script type="text/javascript">

              $(document).ready(function(){
              //parseDate(pass in this method date);
                    Var Date1=parseDate($("#getdate1").val());
                        Var Date2=parseDate($("#getdate2").val());
               //use any oe < or > or = as per ur requirment 
               if(Date1 = Date2){
         return false;  //or your code {}
}
 });
    </script>

For Sure this code will help you.

How to fix the session_register() deprecated issue?

if you need a fallback function you could use this

function session_register($name){
    global $$name;
    $_SESSION[$name] = $$name;
    $$name = &$_SESSION[$name]; 
}

ArrayList of String Arrays

Use a second ArrayList for the 3 strings, not a primitive array. Ie.
private List<List<String>> addresses = new ArrayList<List<String>>();

Then you can have:

ArrayList<String> singleAddress = new ArrayList<String>();
singleAddress.add("17 Fake Street");
singleAddress.add("Phoney town");
singleAddress.add("Makebelieveland");

addresses.add(singleAddress);

(I think some strange things can happen with type erasure here, but I don't think it should matter here)

If you're dead set on using a primitive array, only a minor change is required to get your example to work. As explained in other answers, the size of the array can not be included in the declaration. So changing:

private ArrayList<String[]> addresses = new ArrayList<String[3]>();

private ArrayList<String[]> addresses = new ArrayList<String[]>();

will work.

CSS white space at bottom of page despite having both min-height and height tag

I find it quite remarkable that out of 6 answers, none of them have mentioned the real source of the problem.

Collapsing margins on the last p inside #fw-footer is where that extra space is originating from.

A sensible fix would be to add overflow: hidden to #fw-footer (or simply add margin: 0 on the last p).

You could also just move the script inside that last p outside of the p, and then remove the p entirely; there's no need to wrap a script in a p. The first p (#fw-foottext) has margin: 0 applied, so the problem won't happen with that one.

As an aside, you've broken the fix I gave you in this question:

CSS3 gradient background with unwanted white space at bottom

You need html { height: 100% } and body { min-height: 100% }.

At the moment, you have html { height: auto } being applied, which does not work:

(This happens with a window taller than the content on the page)

Calling Objective-C method from C++ member function?

You need to make your C++ file be treated as Objective-C++. You can do this in xcode by renaming foo.cpp to foo.mm (.mm is the obj-c++ extension). Then as others have said standard obj-c messaging syntax will work.

TypeError: can't use a string pattern on a bytes-like object in re.findall()

You want to convert html (a byte-like object) into a string using .decode, e.g. html = response.read().decode('utf-8').

See Convert bytes to a Python String

How to thoroughly purge and reinstall postgresql on ubuntu?

I just ran into the same issue for Ubuntu 13.04. These commands removed Postgres 9.1:

sudo apt-get purge postgresql
sudo apt-get autoremove postgresql

It occurs to me that perhaps only the second command is necessary, but from there I was able to install Postgres 9.2 (sudo apt-get install postgresql-9.2).

How to set JFrame to appear centered, regardless of monitor resolution?

As simple as this...

setSize(220, 400);
setLocationRelativeTo(null);

or if you are using a frame then set the frame to

frame.setSize(220, 400);
frame.setLocationRelativeTo(null);

For clarification, from the docs:

If the component is null, or the GraphicsConfiguration associated with this component is null, the window is placed in the center of the screen.

Difference between Method and Function?

Both are same, there is no difference its just a different term for the same thing in C#.

Method:

In object-oriented programming, a method is a subroutine (or procedure or function) associated with a class.

With respect to Object Oriented programming the term "Method" is used, not functions.

References with text in LaTeX

I think you can do this with the hyperref package, although I've not tried it myself. From the relevant LaTeX Wikibook section:

The hyperref package introduces another useful command; \autoref{}. This command creates a reference with additional text corresponding to the targets type, all of which will be a hyperlink. For example, the command \autoref{sec:intro} would create a hyperlink to the \label{sec:intro} command, wherever it is. Assuming that this label is pointing to a section, the hyperlink would contain the text "section 3.4", or similar (capitalization rules will be followed, which makes this very convenient). You can customize the prefixed text by redefining \typeautorefname to the prefix you want, as in:

\def\subsectionautorefname{section}

How to plot two columns of a pandas data frame using points?

Now in latest pandas you can directly use df.plot.scatter function

df = pd.DataFrame([[5.1, 3.5, 0], [4.9, 3.0, 0], [7.0, 3.2, 1],
                   [6.4, 3.2, 1], [5.9, 3.0, 2]],
                  columns=['length', 'width', 'species'])
ax1 = df.plot.scatter(x='length',
                      y='width',
                      c='DarkBlue')

https://pandas.pydata.org/pandas-docs/version/0.23/generated/pandas.DataFrame.plot.scatter.html

How to specify the default error page in web.xml?

You can also specify <error-page> for exceptions using <exception-type>, eg below:

<error-page>
    <exception-type>java.lang.Exception</exception-type>
    <location>/errorpages/exception.html</location>
</error-page>

Or map a error code using <error-code>:

<error-page>
    <error-code>404</error-code>
    <location>/errorpages/404error.html</location>
</error-page>

List directory tree structure in python?

Maybe faster than @ellockie ( Maybe )

import os
def file_writer(text):
    with open("folder_structure.txt","a") as f_output:
        f_output.write(text)
def list_files(startpath):


    for root, dirs, files in os.walk(startpath):
        level = root.replace(startpath, '').count(os.sep)
        indent = '\t' * 1 * (level)
        output_string = '{}{}/ \n'.format(indent, os.path.basename(root))
        file_writer(output_string)
        subindent = '\t' * 1 * (level + 1)
        output_string = '%s %s \n' %(subindent,[f for f in files])
        file_writer(''.join(output_string))


list_files("/")

Test results in screenshot below:

How to remove the character at a given index from a string in C?

I tried with strncpy() and snprintf().

int ridx = 1;  
strncpy(word2,word,ridx);   
snprintf(word2+ridx,10-ridx,"%s",&word[ridx+1]);

Find html label associated with a given input

with jquery you could do something like

var nameOfLabel = someInput.attr('id');
var label = $("label[for='" + nameOfLabel + "']");

How to write to a JSON file in the correct format

To make this work on Ubuntu Linux:

I installed the Ubuntu package ruby-json:
```
apt-get install ruby-json
```
I wrote the script in ${HOME}/rubybin/jsonDEMO
$HOME/.bashrc included:
```
${HOME}/rubybin:${PATH}
```

(On this occasion I also typed the above on the bash command line.)

Then it worked when I entered on the command line:

jsonDemo

Access key value from Web.config in Razor View-MVC3 ASP.NET

Here's a real world example with the use of non-minified versus minified assets in your layout.

Web.Config

<appSettings>

   <add key="Environment" value="Dev" />

 </appSettings>

Razor Template - use that var above like this:

@if (System.Configuration.ConfigurationManager.AppSettings["Environment"] == "Dev")
{    
    <link type="text/css" rel="stylesheet" href="@Url.Content("~/Content/styles/theme.css" )">    

}else{        

   <link type="text/css" rel="stylesheet" href="@Url.Content("~/Content/styles/blue_theme.min.css" )">    

}

C# List<> Sort by x then y

I had an issue where OrderBy and ThenBy did not give me the desired result (or I just didn't know how to use them correctly).

I went with a list.Sort solution something like this.

    var data = (from o in database.Orders Where o.ClientId.Equals(clientId) select new {
    OrderId = o.id,
    OrderDate = o.orderDate,
    OrderBoolean = (SomeClass.SomeFunction(o.orderBoolean) ? 1 : 0)
    });

    data.Sort((o1, o2) => (o2.OrderBoolean.CompareTo(o1.OrderBoolean) != 0
    o2.OrderBoolean.CompareTo(o1.OrderBoolean) : o1.OrderDate.Value.CompareTo(o2.OrderDate.Value)));

What is the difference between call and apply?

Call and apply both are used to force the this value when a function is executed. The only difference is that call takes n+1 arguments where 1 is this and 'n' arguments. apply takes only two arguments, one is this the other is argument array.

The advantage I see in apply over call is that we can easily delegate a function call to other function without much effort;

function sayHello() {
  console.log(this, arguments);
}

function hello() {
  sayHello.apply(this, arguments);
}

var obj = {name: 'my name'}
hello.call(obj, 'some', 'arguments');

Observe how easily we delegated hello to sayHello using apply, but with call this is very difficult to achieve.

MySQL - Meaning of "PRIMARY KEY", "UNIQUE KEY" and "KEY" when used together while creating a table

A key is just a normal index. A way over simplification is to think of it like a card catalog at a library. It points MySQL in the right direction.

A unique key is also used for improved searching speed, but it has the constraint that there can be no duplicated items (there are no two x and y where x is not y and x == y).

The manual explains it as follows:

A UNIQUE index creates a constraint such that all values in the index must be distinct. An error occurs if you try to add a new row with a key value that matches an existing row. This constraint does not apply to NULL values except for the BDB storage engine. For other engines, a UNIQUE index permits multiple NULL values for columns that can contain NULL. If you specify a prefix value for a column in a UNIQUE index, the column values must be unique within the prefix.

A primary key is a 'special' unique key. It basically is a unique key, except that it's used to identify something.

The manual explains how indexes are used in general: here.

In MSSQL, the concepts are similar. There are indexes, unique constraints and primary keys.

Untested, but I believe the MSSQL equivalent is:

CREATE TABLE tmp (
  id int NOT NULL PRIMARY KEY IDENTITY,
  uid varchar(255) NOT NULL CONSTRAINT uid_unique UNIQUE,
  name varchar(255) NOT NULL,
  tag int NOT NULL DEFAULT 0,
  description varchar(255),
);

CREATE INDEX idx_name ON tmp (name);
CREATE INDEX idx_tag ON tmp (tag);

Edit: the code above is tested to be correct; however, I suspect that there's a much better syntax for doing it. Been a while since I've used SQL server, and apparently I've forgotten quite a bit :).

Cannot refer to a non-final variable inside an inner class defined in a different method

You cannot refer to non-final variables because Java Language Specification says so. From 8.1.3:
"Any local variable, formal method parameter or exception handler parameter used but not declared in an inner class must be declared final." Whole paragraph.
I can see only part of your code - according to me scheduling modification of local variables is a strange idea. Local variables cease to exist when you leave the function. Maybe static fields of a class would be better?

Access elements of parent window from iframe

I think the problem may be that you are not finding your element because of the "#" in your call to get it:

window.parent.document.getElementById('#target');

You only need the # if you are using jquery. Here it should be:

window.parent.document.getElementById('target');

Doctrine query builder using inner join with conditions

I'm going to answer my own question.

innerJoin should use the keyword "WITH" instead of "ON" (Doctrine's documentation [13.2.6. Helper methods] is inaccurate; [13.2.5. The Expr class] is correct)
no need to link foreign keys in join condition as they're already specified in the entity mapping.

Therefore, the following works for me

$qb->select('c')
    ->innerJoin('c.phones', 'p', 'WITH', 'p.phone = :phone')
    ->where('c.username = :username');

$qb->select('c')
    ->innerJoin('c.phones', 'p', Join::WITH, $qb->expr()->eq('p.phone', ':phone'))
    ->where('c.username = :username');

Git - how delete file from remote repository

If you pushed a file or folder before it was in .gitignore (or had no .gitignore):

Comment it out from .gitignore
Add it back on the filesystem
Remove it from the folder
git add your file && commit it
git push

Automatically accept all SDK licences

I've spent a half day to looking for solution for Bitbucket Pipelines

If you are using Bitbucket Pipelines and you have the issue with accepting all SDK licences, try to use this code in your .yml file:

image: mingc/android-build-box:latest

pipelines:
  default:
  - step:
      script:
        - chmod +x gradlew
        - ./gradlew assemble

It should works.

What is the relative performance difference of if/else versus switch statement in Java?

I totally agree with the opinion that premature optimization is something to avoid.

But it's true that the Java VM has special bytecodes which could be used for switch()'s.

See WM Spec (lookupswitch and tableswitch)

So there could be some performance gains, if the code is part of the performance CPU graph.

How can I prevent the backspace key from navigating back?

Modification of erikkallen's Answer to address different input types

I've found that an enterprising user might press backspace on a checkbox or a radio button in a vain attempt to clear it and instead they would navigate backwards and lose all of their data.

This change should address that issue.

New Edit to address content editable divs

    //Prevents backspace except in the case of textareas and text inputs to prevent user navigation.
    $(document).keydown(function (e) {
        var preventKeyPress;
        if (e.keyCode == 8) {
            var d = e.srcElement || e.target;
            switch (d.tagName.toUpperCase()) {
                case 'TEXTAREA':
                    preventKeyPress = d.readOnly || d.disabled;
                    break;
                case 'INPUT':
                    preventKeyPress = d.readOnly || d.disabled ||
                        (d.attributes["type"] && $.inArray(d.attributes["type"].value.toLowerCase(), ["radio", "checkbox", "submit", "button"]) >= 0);
                    break;
                case 'DIV':
                    preventKeyPress = d.readOnly || d.disabled || !(d.attributes["contentEditable"] && d.attributes["contentEditable"].value == "true");
                    break;
                default:
                    preventKeyPress = true;
                    break;
            }
        }
        else
            preventKeyPress = false;

        if (preventKeyPress)
            e.preventDefault();
    });

Example
To test make 2 files.

starthere.htm - open this first so you have a place to go back to

<a href="./test.htm">Navigate to here to test</a>

test.htm - This will navigate backwards when backspace is pressed while the checkbox or submit has focus (achieved by tabbing). Replace with my code to fix.

<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js" type="text/javascript"></script>
<script type="text/javascript">

    $(document).keydown(function(e) {
        var doPrevent;
        if (e.keyCode == 8) {
            var d = e.srcElement || e.target;
            if (d.tagName.toUpperCase() == 'INPUT' || d.tagName.toUpperCase() == 'TEXTAREA') {
                doPrevent = d.readOnly || d.disabled;
            }
            else
                doPrevent = true;
        }
        else
            doPrevent = false;

        if (doPrevent)
            e.preventDefault();
    });
</script>
</head>
<body>
<input type="text" />
<input type="radio" />
<input type="checkbox" />
<input type="submit" />
</body>
</html>

How to deal with INSTALL_PARSE_FAILED_INCONSISTENT_CERTIFICATES without uninstall?

It means the new copy of your application (on your development machine) was signed with a different signing key than the old copy of your application (installed on the device/emulator). For example, if this is a device, you might have put the old copy on from a different development machine (e.g., some other developer's machine). Or, the old one is signed with your production key and the new one is signed with your debug key.

403 Access Denied on Tomcat 8 Manager App without prompting for user/password

In my case it was the security constraints defined in web.xml. Make sure they have the same roles you use in your tomcat-users.xml file.

For example, this is one of the out-of-the-box tags and will work with the standard tomcat-users.xml.

 <security-constraint>
    <web-resource-collection>
      <web-resource-name>HTML Manager interface (for humans)</web-resource-name>
      <url-pattern>/html/*</url-pattern>
    </web-resource-collection>
    <auth-constraint>
       <role-name>manager-gui</role-name>
    </auth-constraint>
  </security-constraint>

In my case an admin had used a different role-name which prevented me from accessing the manager.

How to replace NA values in a table for selected columns

Starting from the data.table y, you can just write:
y[, (cols):=lapply(.SD, function(i){i[is.na(i)] <- 0; i}), .SDcols = cols]
Don't forget to library(data.table) before creating y and running this command.

Error: Tablespace for table xxx exists. Please DISCARD the tablespace before IMPORT

Had exactly the same problem; I'd brew added [email protected] (after previously having 5.5).

The brew defaults for 5.6 are innodb_file_per_table=1 whereas in 5.5 they're innodb_file_per_table=0.

Your existing ibdata1 file (the combined innodb data) will still have references to the tables you're trying to create/drop. Either change innodb_file_per_table back to 0, or delete the ibdata1 data file (this will lose you all your data, so make sure you mysqldump it first or already have an .sql dump).

The other brew [email protected] default that bit me was the lack of a port, so networking was defaulting to unix sockets, and the mysql client kept reporting:

ERROR 2013 (HY000): Lost connection to MySQL server at 'sending authentication information', system error: 32

I added <string>--port=3306</string> to the .plist array, but you could also specify port=3306 in your my.cnf

Run brew services stop [email protected] make your changes then brew services start [email protected]

How to write oracle insert script with one field as CLOB?

Keep in mind that SQL strings can not be larger than 4000 bytes, while Pl/SQL can have strings as large as 32767 bytes. see below for an example of inserting a large string via an anonymous block which I believe will do everything you need it to do.

note I changed the varchar2(32000) to CLOB

set serveroutput ON 
CREATE TABLE testclob 
  ( 
     id NUMBER, 
     c  CLOB, 
     d  VARCHAR2(4000) 
  ); 

DECLARE 
    reallybigtextstring CLOB := '123'; 
    i                   INT; 
BEGIN 
    WHILE Length(reallybigtextstring) <= 60000 LOOP 
        reallybigtextstring := reallybigtextstring 
                               || '000000000000000000000000000000000'; 
    END LOOP; 

    INSERT INTO testclob 
                (id, 
                 c, 
                 d) 
    VALUES     (0, 
                reallybigtextstring, 
                'done'); 

    dbms_output.Put_line('I have finished inputting your clob: ' 
                         || Length(reallybigtextstring)); 
END; 

/ 
SELECT * 
FROM   testclob; 


 "I have finished inputting your clob: 60030"

How to redirect verbose garbage collection output to a file?

To add to the above answers, there's a good article: Useful JVM Flags – Part 8 (GC Logging) by Patrick Peschlow.

A brief excerpt:

The flag -XX:+PrintGC (or the alias -verbose:gc) activates the “simple” GC logging mode

By default the GC log is written to stdout. With -Xloggc:<file> we may instead specify an output file. Note that this flag implicitly sets -XX:+PrintGC and -XX:+PrintGCTimeStamps as well.

If we use -XX:+PrintGCDetails instead of -XX:+PrintGC, we activate the “detailed” GC logging mode which differs depending on the GC algorithm used.

With -XX:+PrintGCTimeStamps a timestamp reflecting the real time passed in seconds since JVM start is added to every line.

If we specify -XX:+PrintGCDateStamps each line starts with the absolute date and time.

The view 'Index' or its master was not found.

This error was raised because your Controller method name is not same as the View's name.

If you right click on your controller method and select Go To View (Ctrl+M,Ctrl+G), it will either open a View (success) or complain that it couldn't find one (what you're seeing).

Corresponding Controllers and View folders name have the same names.
Corresponding Controller methods & Views pages should same have the same names.
If your method name is different than view name, return view("viewName") in the method.

jQuery detect if string contains something

You can use javascript's indexOf function.

var str1 = "ABCDEFGHIJKLMNOP";
var str2 = "DEFG";
if(str1.indexOf(str2) != -1){
   alert(str2 + " found");
}

What is a Data Transfer Object (DTO)?

The principle behind Data Transfer Object is to create new Data Objects that only include the necessary properties you need for a specific data transaction.

Benefits include:

Make data transfer more secure Reduce transfer size if you remove all unnecessary data.

Conditional formatting based on another cell's value

One more example:

If you have Column from A to D, and need to highlight the whole line (e.g. from A to D) if B is "Complete", then you can do it following:

"Custom formula is":  =$B:$B="Completed" 
Background Color:     red 
Range:                A:D

Of course, you can change Range to A:T if you have more columns.

If B contains "Complete", use search as following:

"Custom formula is":  =search("Completed",$B:$B) 
Background Color:     red 
Range:                A:D

How do I use two submit buttons, and differentiate between which one was used to submit the form?

Give each input a name attribute. Only the clicked input's name attribute will be sent to the server.

<input type="submit" name="publish" value="Publish">
<input type="submit" name="save" value="Save">

And then

<?php
    if (isset($_POST['publish'])) {
        # Publish-button was clicked
    }
    elseif (isset($_POST['save'])) {
        # Save-button was clicked
    }
?>

~~Edit: Changed value attributes to alt. Not sure this is the best approach for image buttons though, any particular reason you don't want to use input[type=image]?~~

Edit: Since this keeps getting upvotes I went ahead and changed the weird alt/value code to real submit inputs. I believe the original question asked for some sort of image buttons but there are so much better ways to achieve that nowadays instead of using input[type=image].

select dept names who have more than 2 employees whose salary is greater than 1000

hope this helps

select DeptName from DEPARTMENT inner join EMPLOYEE using (DeptId) where Salary>1000 group by DeptName having count(*)>2

Difference between a View's Padding and Margin

Let's just suppose you have a button in a view and the size of the view is 200 by 200, and the size of the button is 50 by 50, and the button title is HT. Now the difference between margin and padding is, you can set the margin of the button in the view, for example 20 from the left, 20 from the top, and padding will adjust the text position in the button or text view etc. for example, padding value is 20 from the left, so it will adjust the position of the text.

How do I script a "yes" response for installing programs?

You just need to put -y with the install command.

For example: yum install <package_to_install> -y

Difference between volatile and synchronized in Java

synchronized is method level/block level access restriction modifier. It will make sure that one thread owns the lock for critical section. Only the thread,which own a lock can enter synchronized block. If other threads are trying to access this critical section, they have to wait till current owner releases the lock.

volatile is variable access modifier which forces all threads to get latest value of the variable from main memory. No locking is required to access volatile variables. All threads can access volatile variable value at same time.

A good example to use volatile variable : Date variable.

Assume that you have made Date variable volatile. All the threads, which access this variable always get latest data from main memory so that all threads show real (actual) Date value. You don't need different threads showing different time for same variable. All threads should show right Date value.

Have a look at this article for better understanding of volatile concept.

Lawrence Dol cleary explained your read-write-update query.

Regarding your other queries

When is it more suitable to declare variables volatile than access them through synchronized?

You have to use volatile if you think all threads should get actual value of the variable in real time like the example I have explained for Date variable.

Is it a good idea to use volatile for variables that depend on input?

Answer will be same as in first query.

Refer to this article for better understanding.

is not JSON serializable

class CountryListView(ListView):
     model = Country

    def render_to_response(self, context, **response_kwargs):

         return HttpResponse(json.dumps(list(self.get_queryset().values_list('code', flat=True))),mimetype="application/json")

fixed the problem

also mimetype is important.

MySQL combine two columns into one column

For the MySQL fans out there, I like the IFNULL() function. Other answers here suggest similar functionality with the ISNULL() function in some implementations. In my situation, I have a column of descriptions which is NOT NULL, and a column of serial numbers which may be NULL This is how I combined them into one column:

SELECT CONCAT(description,IFNULL(' SN: ', serial_number),'')) FROM my_table;

My results suggest that the results of concatenating a string with NULL results in a NULL. I have been getting the alternative value in those cases.

Reading local text file into a JavaScript array

Using Node.js

sync mode:

var fs = require("fs");
var text = fs.readFileSync("./mytext.txt");
var textByLine = text.split("\n")

async mode:

var fs = require("fs");
fs.readFile("./mytext.txt", function(text){
    var textByLine = text.split("\n")
});

UPDATE

As of at least Node 6, readFileSync returns a Buffer, so it must first be converted to a string in order for split to work:

var text = fs.readFileSync("./mytext.txt").toString('utf-8');

var text = fs.readFileSync("./mytext.txt", "utf-8");

What does yield mean in PHP?

This function is using yield:

function a($items) {
    foreach ($items as $item) {
        yield $item + 1;
    }
}

It is almost the same as this one without:

function b($items) {
    $result = [];
    foreach ($items as $item) {
        $result[] = $item + 1;
    }
    return $result;
}

The only one difference is that a() returns a generator and b() just a simple array. You can iterate on both.

Also, the first one does not allocate a full array and is therefore less memory-demanding.

How to check if a string contains text from an array of substrings in JavaScript?

substringsArray.every(substring=>yourBigString.indexOf(substring) === -1)

For full support ;)

TypeError: 'list' object cannot be interpreted as an integer

def userNum(iterations):
    myList = []
    for i in range(iterations):
        a = int(input("Enter a number for sound: "))
        myList.append(a)
    print(myList) # print before return
    return myList # return outside of loop

def playSound(myList):
    for i in range(len(myList)): # range takes int not list
        if i == 1:
            winsound.PlaySound("SystemExit", winsound.SND_ALIAS)

Regex for 1 or 2 digits, optional non-alphanumeric, 2 known alphas

^[0-9][0-9]?[^A-Za-z0-9]?po$

You can test it here: http://www.regextester.com/

To use this in C#,

Regex r = new Regex(@"^[0-9][0-9]?[^A-Za-z0-9]?po$");
if (r.Match(someText).Success) {
   //Do Something
}

Remember, @ is a useful symbol that means the parser takes the string literally (eg, you don't need to write \\ for one backslash)

How to bind Close command to a button

For .NET 4.5 SystemCommands class will do the trick (.NET 4.0 users can use WPF Shell Extension google - Microsoft.Windows.Shell or Nicholas Solution).

    <Window.CommandBindings>
        <CommandBinding Command="{x:Static SystemCommands.CloseWindowCommand}" 
                        CanExecute="CloseWindow_CanExec" 
                        Executed="CloseWindow_Exec" />
    </Window.CommandBindings>
    <!-- Binding Close Command to the button control -->
    <Button ToolTip="Close Window" Content="Close" Command="{x:Static SystemCommands.CloseWindowCommand}"/>

In the Code Behind you can implement the handlers like this:

    private void CloseWindow_CanExec(object sender, CanExecuteRoutedEventArgs e)
    {
        e.CanExecute = true;
    }

    private void CloseWindow_Exec(object sender, ExecutedRoutedEventArgs e)
    {
        SystemCommands.CloseWindow(this);
    }

Python string.join(list) on object array rather than string array

The built-in string constructor will automatically call obj.__str__:

''.join(map(str,list))

SQLite "INSERT OR REPLACE INTO" vs. "UPDATE ... WHERE"

I'm currently working on such a statement and figured out another fact to notice: INSERT OR REPLACE will replace any values not supplied in the statement. For instance if your table contains a column "lastname" which you didn't supply a value for, INSERT OR REPLACE will nullify the "lastname" if possible (constraints allow it) or fail.

How to call base.base.method()?

My 2c for this is to implement the functionality you require to be called in a toolkit class and call that from wherever you need:

// Util.cs
static class Util 
{
    static void DoSomething( FooBase foo ) {}
}

// FooBase.cs
class FooBase
{
    virtual void Do() { Util.DoSomething( this ); }
}


// FooDerived.cs
class FooDerived : FooBase
{
    override void Do() { ... }
}

// FooDerived2.cs
class FooDerived2 : FooDerived
{
    override void Do() { Util.DoSomething( this ); }
}

This does require some thought as to access privilege, you may need to add some internal accessor methods to facilitate the functionality.

How to write a SQL DELETE statement with a SELECT statement in the WHERE clause?

Shouldn't you have:

DELETE FROM tableA WHERE entitynum IN (...your select...)

Now you just have a WHERE with no comparison:

DELETE FROM tableA WHERE (...your select...)

So your final query would look like this;

DELETE FROM tableA WHERE entitynum IN (
    SELECT tableA.entitynum FROM tableA q
      INNER JOIN tableB u on (u.qlabel = q.entityrole AND u.fieldnum = q.fieldnum) 
    WHERE (LENGTH(q.memotext) NOT IN (8,9,10) OR q.memotext NOT LIKE '%/%/%')
      AND (u.FldFormat = 'Date')
)

How to delete all rows from all tables in a SQL Server database?

Note that TRUNCATE won't work if you have any referential integrity set.

In that case, this will work:

EXEC sp_MSForEachTable 'DISABLE TRIGGER ALL ON ?'
GO
EXEC sp_MSForEachTable 'ALTER TABLE ? NOCHECK CONSTRAINT ALL'
GO
EXEC sp_MSForEachTable 'DELETE FROM ?'
GO
EXEC sp_MSForEachTable 'ALTER TABLE ? CHECK CONSTRAINT ALL'
GO
EXEC sp_MSForEachTable 'ENABLE TRIGGER ALL ON ?'
GO

Edit: To be clear, the ? in the statements is a ?. It's replaced with the table name by the sp_MSForEachTable procedure.

Returning JSON object as response in Spring Boot

As you are using Spring Boot web, Jackson dependency is implicit and we do not have to define explicitly. You can check for Jackson dependency in your pom.xml in the dependency hierarchy tab if using eclipse.

And as you have annotated with @RestController there is no need to do explicit json conversion. Just return a POJO and jackson serializer will take care of converting to json. It is equivalent to using @ResponseBody when used with @Controller. Rather than placing @ResponseBody on every controller method we place @RestController instead of vanilla @Controller and @ResponseBody by default is applied on all resources in that controller.
Refer this link: https://docs.spring.io/spring/docs/current/spring-framework-reference/html/mvc.html#mvc-ann-responsebody

The problem you are facing is because the returned object(JSONObject) does not have getter for certain properties. And your intention is not to serialize this JSONObject but instead to serialize a POJO. So just return the POJO.
Refer this link: https://stackoverflow.com/a/35822500/5039001

If you want to return a json serialized string then just return the string. Spring will use StringHttpMessageConverter instead of JSON converter in this case.

Single line sftp from terminal

To UPLOAD a single file, you will need to create a bash script. Something like the following should work on OS X if you have sshpass installed.

Usage:

sftpx <password> <user@hostname> <localfile> <remotefile>

Put this script somewhere in your path and call it sftpx:

#!/bin/bash

export RND=`cat /dev/urandom | env LC_CTYPE=C tr -cd 'a-f0-9' | head -c 32`
export TMPDIR=/tmp/$RND
export FILENAME=$(basename "$4")
export DSTDIR=$(dirname "$4")

mkdir $TMPDIR
cp "$3" $TMPDIR/$FILENAME

export SSHPASS=$1
sshpass -e sftp -oBatchMode=no -b - $2 << !
   lcd $TMPDIR
   cd $DSTDIR
   put $FILENAME
   bye
!

rm $TMPDIR/$FILENAME
rmdir $TMPDIR

Difference between Date(dateString) and new Date(dateString)

The difference is the fact (if I recall from the ECMA documentation) is that Date("xx") does not create (in a sense) a new date object (in fact it is equivalent to calling (new Date("xx").toString()). While new Date("xx") will actually create a new date object.

For More Information:

Look at 15.9.2 of http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-262.pdf

Quick-and-dirty way to ensure only one instance of a shell script is running at a time

Quick and dirty?

#!/bin/sh

if [ -f sometempfile ]
  echo "Already running... will now terminate."
  exit
else
  touch sometempfile
fi

..do what you want here..

rm sometempfile

What is the difference between java and core java?

Core Java is Sun Microsystem's, used to refer to Java SE. And there are Java ME and Java EE (J2EE). So this is told in order to differentiate with the Java ME and J2EE. So I feel Core Java is only used to mention J2SE.

Java having 3 category:

J2SE(Java to Standard Edition) - Core Java

J2EE(Java to Enterprises Edition)- Advance Java + Framework

J2ME(Java to Micro Edition)

Thank You..

UIBarButtonItem in navigation bar programmatically?

func viewDidLoad(){
let homeBtn: UIButton = UIButton(type: UIButtonType.custom)

        homeBtn.setImage(UIImage(named: "Home.png"), for: [])

        homeBtn.addTarget(self, action: #selector(homeAction), for: UIControlEvents.touchUpInside)

        homeBtn.frame = CGRect(x: 0, y: 0, width: 30, height: 30)

        let homeButton = UIBarButtonItem(customView: homeBtn)


        let backBtn: UIButton = UIButton(type: UIButtonType.custom)

        backBtn.setImage(UIImage(named: "back.png"), for: [])

        backBtn.addTarget(self, action: #selector(backAction), for: UIControlEvents.touchUpInside)

        backBtn.frame = CGRect(x: -10, y: 0, width: 30, height: 30)

        let backButton = UIBarButtonItem(customView: backBtn)
        self.navigationItem.setLeftBarButtonItems([backButton,homeButton], animated: true)
}

}

Add attribute 'checked' on click jquery

A simple answer is to add checked attributes within a checkbox:

$('input[id='+$(this).attr("id")+']').attr("checked", "checked");

Find everything between two XML tags with RegEx

this can capture most outermost layer pair of tags, even with attribute in side or without end tags

(<!--((?!-->).)*-->|<\w*((?!\/<).)*\/>|<(?<tag>\w+)[^>]*>(?>[^<]|(?R))*<\/\k<tag>\s*>)

edit: as mentioned in comment above, regex is always not enough to parse xml, trying to modify the regex to fit more situation only makes it longer but still useless

Apache is not running from XAMPP Control Panel ( Error: Apache shutdown unexpectedly. This may be due to a blocked port)

I have installed VMWare Workstation. So, It was causing the error.

Services.msc and stopped the 'Workstation' Services.

This has solved my problems.

Thanks

What does $_ mean in PowerShell?

$_ is an variable which iterates over each object/element passed from the previous | (pipe).

Read a HTML file into a string variable in memory

You can do it the simple way:

string pathToHTMLFile = @"C:\temp\someFile.html";
string htmlString = File.ReadAllText(pathToHTMLFile);

Or you could stream it in with FileStream/StreamReader:

using (FileStream fs = File.Open(pathToHTMLFile, FileMode.Open, FileAccess.ReadWrite))
{
    using (StreamReader sr = new StreamReader(fs))
    {
        htmlString = sr.ReadToEnd();
    }
}

This latter method allows you to open the file while still permitting others to perform Read/Write operations on the file. I can't imagine an HTML file being very big, but it has the added benefit of streaming the file instead of capturing it as one large chunk like the first method.

Difference between TCP and UDP?

Run into this thread and let me try to express it in this way.

TCP

3-way handshake

Bob: Hey Amy, I'd like to tell you a secret
Amy: OK, go ahead, I'm ready
Bob: OK

Communication
Bob: 'I', this is the first letter
Amy: First letter received, please send me the second letter
Bob: ' ', this is the second letter
Amy: Second letter received, please send me the third letter
Bob: 'L', this is the third letter
After a while
Bob: 'L', this the third letter
Amy: Third letter received, please send me the fourth letter
Bob: 'O', this the forth letter
Amy: ...
......

4-way handshake
Bob: My secret is exposed, now, you know my heart.
Amy: OK. I have nothing to say.
Bob: OK.

UDP

Bob: I LOVE U
Amy received: OVI L E

TCP is more reliable than UDP with even message order guaranteed, that's no doubt why UDP is more lightweight and efficient.

How do I get user IP address in django?

In django.VERSION (2, 1, 1, 'final', 0) request handler

sock=request._stream.stream.raw._sock
#<socket.socket fd=1236, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=0, laddr=('192.168.1.111', 8000), raddr=('192.168.1.111', 64725)>
client_ip,port=sock.getpeername()

if you call above code twice,you may got

AttributeError("'_io.BytesIO' object has no attribute 'stream'",)

AttributeError("'LimitedStream' object has no attribute 'raw'")

Java "?" Operator for checking null - What is it? (Not Ternary!)

One way to workaround the lack of "?" operator using Java 8 without the overhead of try-catch (which could also hide a NullPointerException originated elsewhere, as mentioned) is to create a class to "pipe" methods in a Java-8-Stream style.

public class Pipe<T> {
    private T object;

    private Pipe(T t) {
        object = t;
    }

    public static<T> Pipe<T> of(T t) {
        return new Pipe<>(t);
    }

    public <S> Pipe<S> after(Function<? super T, ? extends S> plumber) {
        return new Pipe<>(object == null ? null : plumber.apply(object));
    }

    public T get() {
        return object;
    }

    public T orElse(T other) {
        return object == null ? other : object;
    }
}

Then, the given example would become:

public String getFirstName(Person person) {
    return Pipe.of(person).after(Person::getName).after(Name::getGivenName).get();
}

[EDIT]

Upon further thought, I figured out that it is actually possible to achieve the same only using standard Java 8 classes:

public String getFirstName(Person person) {
    return Optional.ofNullable(person).map(Person::getName).map(Name::getGivenName).orElse(null);
}

In this case, it is even possible to choose a default value (like "<no first name>") instead of null by passing it as parameter of orElse.

How to call a stored procedure from Java and JPA

persistence.xml

 <persistence-unit name="PU2" transaction-type="RESOURCE_LOCAL">
<non-jta-data-source>jndi_ws2</non-jta-data-source>
<exclude-unlisted-classes>false</exclude-unlisted-classes>
<properties/>

codigo java

  String PERSISTENCE_UNIT_NAME = "PU2";
    EntityManagerFactory factory2;
    factory2 = Persistence.createEntityManagerFactory(PERSISTENCE_UNIT_NAME);

    EntityManager em2 = factory2.createEntityManager();
    boolean committed = false;
    try {

        try {
            StoredProcedureQuery storedProcedure = em2.createStoredProcedureQuery("PKCREATURNO.INSERTATURNO");
            // set parameters
            storedProcedure.registerStoredProcedureParameter("inuPKEMPRESA", BigDecimal.class, ParameterMode.IN);
            storedProcedure.registerStoredProcedureParameter("inuPKSERVICIO", BigDecimal.class, ParameterMode.IN);
            storedProcedure.registerStoredProcedureParameter("inuPKAREA", BigDecimal.class, ParameterMode.IN);
            storedProcedure.registerStoredProcedureParameter("isbCHSIGLA", String.class, ParameterMode.IN);
            storedProcedure.registerStoredProcedureParameter("INUSINCALIFICACION", BigInteger.class, ParameterMode.IN);
            storedProcedure.registerStoredProcedureParameter("INUTIMBRAR", BigInteger.class, ParameterMode.IN);
            storedProcedure.registerStoredProcedureParameter("INUTRANSFERIDO", BigInteger.class, ParameterMode.IN);
            storedProcedure.registerStoredProcedureParameter("INTESTADO", BigInteger.class, ParameterMode.IN);
            storedProcedure.registerStoredProcedureParameter("inuContador", BigInteger.class, ParameterMode.OUT);

            BigDecimal inuPKEMPRESA = BigDecimal.valueOf(1);
            BigDecimal inuPKSERVICIO = BigDecimal.valueOf(5);
            BigDecimal inuPKAREA = BigDecimal.valueOf(23);
            String isbCHSIGLA = "";
            BigInteger INUSINCALIFICACION = BigInteger.ZERO;
            BigInteger INUTIMBRAR = BigInteger.ZERO;
            BigInteger INUTRANSFERIDO = BigInteger.ZERO;
            BigInteger INTESTADO = BigInteger.ZERO;
            BigInteger inuContador = BigInteger.ZERO;

            storedProcedure.setParameter("inuPKEMPRESA", inuPKEMPRESA);
            storedProcedure.setParameter("inuPKSERVICIO", inuPKSERVICIO);
            storedProcedure.setParameter("inuPKAREA", inuPKAREA);
            storedProcedure.setParameter("isbCHSIGLA", isbCHSIGLA);
            storedProcedure.setParameter("INUSINCALIFICACION", INUSINCALIFICACION);
            storedProcedure.setParameter("INUTIMBRAR", INUTIMBRAR);
            storedProcedure.setParameter("INUTRANSFERIDO", INUTRANSFERIDO);
            storedProcedure.setParameter("INTESTADO", INTESTADO);
            storedProcedure.setParameter("inuContador", inuContador);

            // execute SP
            storedProcedure.execute();
            // get result

            try {
                long _inuContador = (long) storedProcedure.getOutputParameterValue("inuContador");
                varCon = _inuContador + "";
            } catch (Exception e) {
            } 
        } finally {

        }
    } finally {
        em2.close();
    }

How to reload the current route with the angular 2 router

On param change reload page won't happen. This is really good feature. There is no need to reload the page but we should change the value of the component. paramChange method will call on url change. So we can update the component data

/product/: id / details

import { ActivatedRoute, Params, Router } from ‘@angular/router’;

export class ProductDetailsComponent implements OnInit {

constructor(private route: ActivatedRoute, private router: Router) {
    this.route.params.subscribe(params => {
        this.paramsChange(params.id);
    });
}

// Call this method on page change

ngOnInit() {

}

// Call this method on change of the param
paramsChange(id) {

}

How to easily consume a web service from PHP

HI I got this from this site : http://forums.asp.net/t/887892.aspx?Consume+an+ASP+NET+Web+Service+with+PHP

The web service has method Add which takes two params:

<?php
    $client = new SoapClient("http://localhost/csharp/web_service.asmx?wsdl");

     print_r( $client->Add(array("a" => "5", "b" =>"2")));
?>

raw_input function in Python

It presents a prompt to the user (the optional arg of raw_input([arg])), gets input from the user and returns the data input by the user in a string. See the docs for raw_input().

Example:

name = raw_input("What is your name? ")
print "Hello, %s." % name

This differs from input() in that the latter tries to interpret the input given by the user; it is usually best to avoid input() and to stick with raw_input() and custom parsing/conversion code.

Note: This is for Python 2.x

Smooth scroll without the use of jQuery

I've made an example without jQuery here : http://codepen.io/sorinnn/pen/ovzdq

/**
    by Nemes Ioan Sorin - not an jQuery big fan 
    therefore this script is for those who love the old clean coding style  
    @id = the id of the element who need to bring  into view

    Note : this demo scrolls about 12.700 pixels from Link1 to Link3
*/
(function()
{
      window.setTimeout = window.setTimeout; //
})();

      var smoothScr = {
      iterr : 30, // set timeout miliseconds ..decreased with 1ms for each iteration
        tm : null, //timeout local variable
      stopShow: function()
      {
        clearTimeout(this.tm); // stopp the timeout
        this.iterr = 30; // reset milisec iterator to original value
      },
      getRealTop : function (el) // helper function instead of jQuery
      {
        var elm = el; 
        var realTop = 0;
        do
        {
          realTop += elm.offsetTop;
          elm = elm.offsetParent;
        }
        while(elm);
        return realTop;
      },
      getPageScroll : function()  // helper function instead of jQuery
      {
        var pgYoff = window.pageYOffset || document.body.scrollTop || document.documentElement.scrollTop;
        return pgYoff;
      },
      anim : function (id) // the main func
      {
        this.stopShow(); // for click on another button or link
        var eOff, pOff, tOff, scrVal, pos, dir, step;

        eOff = document.getElementById(id).offsetTop; // element offsetTop

        tOff =  this.getRealTop(document.getElementById(id).parentNode); // terminus point 

        pOff = this.getPageScroll(); // page offsetTop

        if (pOff === null || isNaN(pOff) || pOff === 'undefined') pOff = 0;

        scrVal = eOff - pOff; // actual scroll value;

        if (scrVal > tOff) 
        {
          pos = (eOff - tOff - pOff); 
          dir = 1;
        }
        if (scrVal < tOff)
        {
          pos = (pOff + tOff) - eOff;
          dir = -1; 
        }
        if(scrVal !== tOff) 
        {
          step = ~~((pos / 4) +1) * dir;

          if(this.iterr > 1) this.iterr -= 1; 
          else this.itter = 0; // decrease the timeout timer value but not below 0
          window.scrollBy(0, step);
          this.tm = window.setTimeout(function()
          {
             smoothScr.anim(id);  
          }, this.iterr); 
        }  
        if(scrVal === tOff) 
        { 
          this.stopShow(); // reset function values
          return;
        }
    }
 }

YAML mapping values are not allowed in this context

This is valid YAML:

jobs:
 - name: A
   schedule: "0 0/5 * 1/1 * ? *"
   type: mongodb.cluster
   config:
     host: mongodb://localhost:27017/admin?replicaSet=rs
     minSecondaries: 2
     minOplogHours: 100
     maxSecondaryDelay: 120
 - name: B
   schedule: "0 0/5 * 1/1 * ? *"
   type: mongodb.cluster
   config:
     host: mongodb://localhost:27017/admin?replicaSet=rs
     minSecondaries: 2
     minOplogHours: 100
     maxSecondaryDelay: 120

Note, that every '-' starts new element in the sequence. Also, indentation of keys in the map should be exactly same.

How can we print line numbers to the log in java

We ended up using a custom class like this for our Android work:

import android.util.Log;    
public class DebugLog {
 public final static boolean DEBUG = true;    
 public static void log(String message) {
  if (DEBUG) {
    String fullClassName = Thread.currentThread().getStackTrace()[2].getClassName();
    String className = fullClassName.substring(fullClassName.lastIndexOf(".") + 1);
    String methodName = Thread.currentThread().getStackTrace()[2].getMethodName();
    int lineNumber = Thread.currentThread().getStackTrace()[2].getLineNumber();

    Log.d(className + "." + methodName + "():" + lineNumber, message);
  }
 }
}

Ruby Hash to array of values

It is as simple as

hash.values
#=> [["a", "b", "c"], ["b", "c"]]

this will return a new array populated with the values from hash

if you want to store that new array do

array_of_values = hash.values
#=> [["a", "b", "c"], ["b", "c"]]

array_of_values
 #=> [["a", "b", "c"], ["b", "c"]]

Python 3 print without parenthesis

No. That will always be a syntax error in Python 3. Consider using 2to3 to translate your code to Python 3

Indent List in HTML and CSS

Normally, all lists are being displayed vertically anyways. So do you want to display it horizontally?

Anyways, you asked to override the main css file and set some css locally. You cannot do it inside <ul> with style="", that it would apply on the children (<li>).

Closest thing to locally manipulating your list would be:

<style>
    li {display: inline-block;}
</style>
<ul>
  <li>Coffee</li>
  <li>Tea
    <ul>
        <li>Black tea</li>
        <li>Green tea</li>
    </ul>
  </li>
  <li>Milk</li>
</ul>

CSS: auto height on containing div, 100% height on background div inside containing div

You shouldn't have to set height: 100% at any point if you want your container to fill the page. Chances are, your problem is rooted in the fact that you haven't cleared the floats in the container's children. There are quite a few ways to solve this problem, mainly adding overflow: hidden to the container.

#container { overflow: hidden; }

Should be enough to solve whatever height problem you're having.

C error: undefined reference to function, but it IS defined

I had this issue recently. In my case, I had my IDE set to choose which compiler (C or C++) to use on each file according to its extension, and I was trying to call a C function (i.e. from a .c file) from C++ code.

The .h file for the C function wasn't wrapped in this sort of guard:

#ifdef __cplusplus
extern "C" {
#endif

// all of your legacy C code here

#ifdef __cplusplus
}
#endif

I could've added that, but I didn't want to modify it, so I just included it in my C++ file like so:

extern "C" {
#include "legacy_C_header.h"
}

(Hat tip to UncaAlby for his clear explanation of the effect of extern "C".)

How to ignore PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException?

Set validateTLSCertificates property to false for your JSoup command.

Jsoup.connect("https://google.com/").validateTLSCertificates(false).get();

Base64 encoding and decoding in client-side Javascript

Internet Explorer 10+

// Define the string
var string = 'Hello World!';

// Encode the String
var encodedString = btoa(string);
console.log(encodedString); // Outputs: "SGVsbG8gV29ybGQh"

// Decode the String
var decodedString = atob(encodedString);
console.log(decodedString); // Outputs: "Hello World!"

Cross-Browser

Re-written and modularized UTF-8 and Base64 Javascript Encoding and Decoding Libraries / Modules for AMD, CommonJS, Nodejs and Browsers. Cross-browser compatible.

with Node.js

Here is how you encode normal text to base64 in Node.js:

//Buffer() requires a number, array or string as the first parameter, and an optional encoding type as the second parameter. 
// Default is utf8, possible encoding types are ascii, utf8, ucs2, base64, binary, and hex
var b = new Buffer('JavaScript');
// If we don't use toString(), JavaScript assumes we want to convert the object to utf8.
// We can make it convert to other formats by passing the encoding type to toString().
var s = b.toString('base64');

And here is how you decode base64 encoded strings:

var b = new Buffer('SmF2YVNjcmlwdA==', 'base64')
var s = b.toString();

with Dojo.js

To encode an array of bytes using dojox.encoding.base64:

var str = dojox.encoding.base64.encode(myByteArray);

To decode a base64-encoded string:

var bytes = dojox.encoding.base64.decode(str)

bower install angular-base64

<script src="bower_components/angular-base64/angular-base64.js"></script>

angular
    .module('myApp', ['base64'])
    .controller('myController', [

    '$base64', '$scope', 
    function($base64, $scope) {
    
        $scope.encoded = $base64.encode('a string');
        $scope.decoded = $base64.decode('YSBzdHJpbmc=');
}]);

But How?

If you would like to learn more about how base64 is encoded in general, and in JavaScript in-particular, I would recommend this article: Computer science in JavaScript: Base64 encoding

Add text to Existing PDF using Python

pdfrw will let you read in pages from an existing PDF and draw them to a reportlab canvas (similar to drawing an image). There are examples for this in the pdfrw examples/rl1 subdirectory on github. Disclaimer: I am the pdfrw author.

How to change Apache Tomcat web server port number

1) Locate server.xml in {Tomcat installation folder}\ conf \ 2) Find following similar statement

       <!-- Define a non-SSL HTTP/1.1 Connector on port 8180 -->
      <Connector port="8080" maxHttpHeaderSize="8192"
           maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
           enableLookups="false" redirectPort="8443" acceptCount="100"
           connectionTimeout="20000" disableUploadTimeout="true" />

For example

<Connector port="8181" protocol="HTTP/1.1" 
           connectionTimeout="20000" 
           redirectPort="8443" />

Edit and save the server.xml file. Restart Tomcat. Done

Further reference: http://www.mkyong.com/tomcat/how-to-change-tomcat-default-port/

Find and replace entire mysql database

Simple Soltion

UPDATE `table_name`
 SET `field_name` = replace(same_field_name, 'unwanted_text', 'wanted_text')

Transparent control over PictureBox

jQuery get the rendered height of an element?

style = window.getComputedStyle(your_element);

then simply: style.height

JQuery $.ajax() post - data in a java servlet

You don't want a string, you really want a JS map of key value pairs. E.g., change:

 data: myDataVar.toString(),

with:

var myKeyVals = { A1984 : 1, A9873 : 5, A1674 : 2, A8724 : 1, A3574 : 3, A1165 : 5 }



var saveData = $.ajax({
      type: 'POST',
      url: "someaction.do?action=saveData",
      data: myKeyVals,
      dataType: "text",
      success: function(resultData) { alert("Save Complete") }
});
saveData.error(function() { alert("Something went wrong"); });

jQuery understands key value pairs like that, it does NOT understand a big string. It passes it simply as a string.

UPDATE: Code fixed.

pip is not able to install packages correctly: Permission denied error

It looks like you're having a permissions error, based on this message in your output: error: could not create '/lib/python2.7/site-packages/lxml': Permission denied.

One thing you can try is doing a user install of the package with pip install lxml --user. For more information on how that works, check out this StackOverflow answer. (Thanks to Ishaan Taylor for the suggestion)

You can also run pip install as a superuser with sudo pip install lxml but it is not generally a good idea because it can cause issues with your system-level packages.

Kill process by name?

The Alex Martelli answer won't work in Python 3 because out will be a bytes object and thus result in a TypeError: a bytes-like object is required, not 'str' when testing if 'iChat' in line:.

Quoting from subprocess documentation:

communicate() returns a tuple (stdout_data, stderr_data). The data will be strings if streams were opened in text mode; otherwise, bytes.

For Python 3, this is solved by adding the text=True (>= Python 3.7) or universal_newlines=True argument to the Popen constructor. out will then be returned as a string object.

import subprocess, signal
import os

p = subprocess.Popen(['ps', '-A'], stdout=subprocess.PIPE, text=True)
out, err = p.communicate()

for line in out.splitlines():
    if 'iChat' in line:
        pid = int(line.split(None, 1)[0])    
        os.kill(pid, signal.SIGKILL)

Alternatively, you can create a string using the decode() method of bytes.

import subprocess, signal
import os

p = subprocess.Popen(['ps', '-A'], stdout=subprocess.PIPE)
out, err = p.communicate()

for line in out.splitlines():
    if 'iChat' in line.decode('utf-8'):
        pid = int(line.split(None, 1)[0])    
        os.kill(pid, signal.SIGKILL)

How to git-svn clone the last n revisions from a Subversion repository?

I find myself using the following often to get a limited number of revisions out of our huge subversion tree (we're soon reaching svn revision 35000).

# checkout a specific revision
git svn clone -r N svn://some/repo/branch/some-branch
# enter it and get all commits since revision 'N'
cd some-branch
git svn rebase

And a good way to find out where a branch started is to do a svn log it and find the first one on the branch (the last one listed when doing):

svn log --stop-on-copy svn://some/repo/branch/some-branch

So far I have not really found the hassle worth it in tracking all branches. It takes too much time to clone and svn and git don't work together as good as I would like. I tend to create patch files and apply them on the git clone of another svn branch.

Generate GUID in MySQL for existing Data?

I faced mostly the same issue. Im my case uuid is stored as BINARY(16) and has NOT NULL UNIQUE constraints. And i faced with the issue when the same UUID was generated for every row, and UNIQUE constraint does not allow this. So this query does not work:

UNHEX(REPLACE(uuid(), '-', ''))

But for me it worked, when i used such a query with nested inner select:

UNHEX(REPLACE((SELECT uuid()), '-', ''))

Then is produced unique result for every entry.

Service Reference Error: Failed to generate code for the service reference

It would be extremely difficult to guess the problem since it is due to a an error in the WSDL and without examining the WSDL, I cannot comment much more. So if you can share your WSDL, please do so.

All I can say is that there seems to be a missing schema in the WSDL (with the target namespace 'http://service.ebms.edi.cecid.hku.hk/'). I know about issues and different handling of the schema when include instructions are ignored.

Generally I have found Microsoft's implementation of web services pretty good so I think the web service is sending back dodgy WSDL.

Access restriction on class due to restriction on required library rt.jar?

Just change the order of build path libraries of your project. Right click on project>Build Path> Configure Build Path>Select Order and Export(Tab)>Change the order of the entries. I hope moving the "JRE System library" to the bottom will work. It worked so for me. Easy and simple....!!!

Where can I find a list of Mac virtual key codes?

Found an answer here.

So:

Command key is 55
Shift is 56
Caps Lock 57
Option is 58
Control is 59.

Getting SyntaxError for print with keyword argument end=' '

How about this:

#Only for use in Python 2.6.0a2 and later
from __future__ import print_function

This allows you to use the Python 3.0 style print function without having to hand-edit all occurrences of print :)

The backend version is not supported to design database diagrams or tables

You only get that message if you try to use Designer or diagrams. If you use t-SQL it works fine:

Select * 

into newdb.dbo.newtable
from olddb.dbo.yourtable

where olddb.dbo.yourtable has been created in 2008 exactly as you want the table to be in 2012

Programs & Examples On #Fast app switching

How do I format a string using a dictionary in python-3.x?

How do I get IntelliJ to recognize common Python modules?

How to find indices of all occurrences of one string in another in JavaScript?

ElasticSearch: Unassigned Shards, how to fix?

How can I make a button redirect my page to another page?

Create a basic matrix in C (input by user !)

How Can I Convert Postscript Type 1 font to .otf or .ttf?

Install apps silently, with granted INSTALL_PACKAGES permission

!/bin/bash

Command line tool to dump Windows DLL version?

how to include glyphicons in bootstrap 3

select2 changing items dynamically

Appending a byte[] to the end of another byte[]

Difference between malloc and calloc?

How to add an integer to each element in a list?

ASP.NET MVC3 Razor - Html.ActionLink style

How to get setuptools and easy_install?

'float' vs. 'double' precision

load Js file in HTML

Where does Hive store files in HDFS?

How to compile C++ under Ubuntu Linux?

Android Studio emulator does not come with Play Store for API 23

Storing C++ template function definitions in a .CPP file

How to create NSIndexPath for TableView

How to convert a file into a dictionary?

How to create a file in Ruby

How to add column if not exists on PostgreSQL?

How to create an empty file with Ansible?

Iterating C++ vector from the end to the beginning

How to truncate milliseconds off of a .NET DateTime

Convert Python dict into a dataframe

Git/GitHub can't push to master

Converting JSON String to Dictionary Not List

Android Dialog: Removing title bar

Removing a Fragment from the back stack

Push Notifications in Android Platform

How do you make an element "flash" in jQuery

What is the difference between Linear search and Binary search?

How Do I Convert an Integer to a String in Excel VBA?

How to animate the change of image in an UIImageView?

Getting hold of the outer class object from the inner class object

Comparing two java.util.Dates to see if they are in the same day

What's the difference between interface and @interface in java?

How to assign a select result to a variable?

What is .htaccess file?

Is there a way to instantiate a class by name in Java?

How do I do a bulk insert in mySQL using node.js

Get HTML5 localStorage keys

Django - Did you forget to register or load this tag?

Generating a UUID in Postgres for Insert statement?

How do I declare a model class in my Angular 2 component using TypeScript?

Run .php file in Windows Command Prompt (cmd)

Appending to list in Python dictionary

How to create an Excel File with Nodejs?

setBackground vs setBackgroundDrawable (Android)

Sorting 1 million 8-decimal-digit numbers with 1 MB of RAM

Slicing a dictionary

Java ByteBuffer to String

Convert PDF to clean SVG?

Do we have router.reload in vue-router?

Convert 4 bytes to int

NumPy first and last element from array

Finding three elements in an array whose sum is closest to a given number

How can I get an int from stdio in C?

Outputs

HTML how to clear input using javascript?

Datatable vs Dataset

How to give a pandas/matplotlib bar graph custom colors

What EXACTLY is meant by "de-referencing a NULL pointer"?

MySql ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

How can I specify a local gem in my Gemfile?

The module ".dll" was loaded but the entry-point was not found

Can't get Gulp to run: cannot find module 'gulp-util'

Convert bytes to int?

Why does JSHint throw a warning if I am using const?

Convert a List<T> into an ObservableCollection<T>

How to replace a string in multiple files in linux command line

Problems with Android Fragment back stack

What's the difference between INNER JOIN, LEFT JOIN, RIGHT JOIN and FULL JOIN?