Programs & Examples On #Nine patch

A NinePatch is a stretchable bitmap image, which Android will automatically resize to accommodate the contents of the View in which you have placed it as the background. The four corners are unscaled; the four edges are scaled in one axis, and the middle is scaled in both axes.

How to change the spinner background in Android?

You can change background color and drop down icon like doing this way

Step1: In drawable folder make background.xml for border of spinner.

<shape xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="@android:color/transparent" />
<corners android:radius="5dp" />
<stroke
    android:width="1dp"
    android:color="@color/darkGray" />
</shape>  //edited

Step2: for layout design of spinner use this drop down icon or any image drop.pnjuse this image like as

  <RelativeLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginRight="3dp"
                    android:layout_weight=".28"
                    android:background="@drawable/spinner_border"
                    android:orientation="horizontal">

                    <Spinner
                        android:id="@+id/spinner2"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:layout_centerVertical="true"
                        android:layout_gravity="center"
                        android:background="@android:color/transparent"
                        android:gravity="center"
                        android:layout_marginLeft="5dp"
                        android:spinnerMode="dropdown" />

                    <ImageView
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_alignParentRight="true"
                        android:layout_centerVertical="true"
                        android:layout_gravity="center"
                        android:src="@mipmap/drop" />

                </RelativeLayout>

Finally looks like below image and it is every where clickable in round area and no need of to write click Lister for imageView.

For more details , you can see Here

enter image description here

Setting DEBUG = False causes 500 Error

I know that this is a super old question, but maybe I could help some one else. If you are having a 500 error after setting DEBUG=False, you can always run the manage.py runserver in the command line to see any errors that wont appear in any web error logs.

Search for an item in a Lua list

function valid(data, array)
 local valid = {}
 for i = 1, #array do
  valid[array[i]] = true
 end
 if valid[data] then
  return false
 else
  return true
 end
end

Here's the function I use for checking if data is in an array.

Update built-in vim on Mac OS X

brew install vim --override-system-vi

What is the best algorithm for overriding GetHashCode?

I usually go with something like the implementation given in Josh Bloch's fabulous Effective Java. It's fast and creates a pretty good hash which is unlikely to cause collisions. Pick two different prime numbers, e.g. 17 and 23, and do:

public override int GetHashCode()
{
    unchecked // Overflow is fine, just wrap
    {
        int hash = 17;
        // Suitable nullity checks etc, of course :)
        hash = hash * 23 + field1.GetHashCode();
        hash = hash * 23 + field2.GetHashCode();
        hash = hash * 23 + field3.GetHashCode();
        return hash;
    }
}

As noted in comments, you may find it's better to pick a large prime to multiply by instead. Apparently 486187739 is good... and although most examples I've seen with small numbers tend to use primes, there are at least similar algorithms where non-prime numbers are often used. In the not-quite-FNV example later, for example, I've used numbers which apparently work well - but the initial value isn't a prime. (The multiplication constant is prime though. I don't know quite how important that is.)

This is better than the common practice of XORing hashcodes for two main reasons. Suppose we have a type with two int fields:

XorHash(x, x) == XorHash(y, y) == 0 for all x, y
XorHash(x, y) == XorHash(y, x) for all x, y

By the way, the earlier algorithm is the one currently used by the C# compiler for anonymous types.

This page gives quite a few options. I think for most cases the above is "good enough" and it's incredibly easy to remember and get right. The FNV alternative is similarly simple, but uses different constants and XOR instead of ADD as a combining operation. It looks something like the code below, but the normal FNV algorithm operates on individual bytes, so this would require modifying to perform one iteration per byte, instead of per 32-bit hash value. FNV is also designed for variable lengths of data, whereas the way we're using it here is always for the same number of field values. Comments on this answer suggest that the code here doesn't actually work as well (in the sample case tested) as the addition approach above.

// Note: Not quite FNV!
public override int GetHashCode()
{
    unchecked // Overflow is fine, just wrap
    {
        int hash = (int) 2166136261;
        // Suitable nullity checks etc, of course :)
        hash = (hash * 16777619) ^ field1.GetHashCode();
        hash = (hash * 16777619) ^ field2.GetHashCode();
        hash = (hash * 16777619) ^ field3.GetHashCode();
        return hash;
    }
}

Note that one thing to be aware of is that ideally you should prevent your equality-sensitive (and thus hashcode-sensitive) state from changing after adding it to a collection that depends on the hash code.

As per the documentation:

You can override GetHashCode for immutable reference types. In general, for mutable reference types, you should override GetHashCode only if:

  • You can compute the hash code from fields that are not mutable; or
  • You can ensure that the hash code of a mutable object does not change while the object is contained in a collection that relies on its hash code.

The link to the FNV article is broken but here is a copy in the Internet Archive: Eternally Confuzzled - The Art of Hashing

How do I check if a property exists on a dynamic anonymous type in c#?

Using reflection, this is the function i use :

public static bool doesPropertyExist(dynamic obj, string property)
{
    return ((Type)obj.GetType()).GetProperties().Where(p => p.Name.Equals(property)).Any();
}

then..

if (doesPropertyExist(myDynamicObject, "myProperty")){
    // ...
}

How to disable compiler optimizations in gcc?

To test without copy elision and see you copy/move constructors/operators in action add "-fno-elide-constructors".

Even with no optimizations (-O0 ), GCC and Clang will still do copy elision, which has the effect of skipping copy/move constructors in some cases. See this question for the details about copy elision.

However, in Clang 3.4 it does trigger a bug (an invalid temporary object without calling constructor), which is fixed in 3.5.

Why does datetime.datetime.utcnow() not contain timezone information?

To add timezone information in Python 3.2+

import datetime

>>> d = datetime.datetime.now(tz=datetime.timezone.utc)
>>> print(d.tzinfo)
'UTC+00:00'

What is the correct way to free memory in C#

1.If I have something like Foo o = new Foo(); inside the method, does that mean that each time the timer ticks, I'm creating a new object and a new reference to that object?

Yes.

2.If I have string foo = null and then I just put something temporal in foo, is it the same as above?

If you are asking if the behavior is the same then yes.

3.Does the garbage collector ever delete the object and the reference or objects are continually created and stay in memory?

The memory used by those objects is most certainly collected after the references are deemed to be unused.

4.If I just declare Foo o; and not point it to any instance, isn't that disposed when the method ends?

No, since no object was created then there is no object to collect (dispose is not the right word).

5.If I want to ensure that everything is deleted, what is the best way of doing it

If the object's class implements IDisposable then you certainly want to greedily call Dispose as soon as possible. The using keyword makes this easier because it calls Dispose automatically in an exception-safe way.

Other than that there really is nothing else you need to do except to stop using the object. If the reference is a local variable then when it goes out of scope it will be eligible for collection.1 If it is a class level variable then you may need to assign null to it to make it eligible before the containing class is eligible.


1This is technically incorrect (or at least a little misleading). An object can be eligible for collection long before it goes out of scope. The CLR is optimized to collect memory when it detects that a reference is no longer used. In extreme cases the CLR can collect an object even while one of its methods is still executing!

Update:

Here is an example that demonstrates that the GC will collect objects even though they may still be in-scope. You have to compile a Release build and run this outside of the debugger.

static void Main(string[] args)
{
    Console.WriteLine("Before allocation");
    var bo = new BigObject();
    Console.WriteLine("After allocation");
    bo.SomeMethod();
    Console.ReadLine();
    // The object is technically in-scope here which means it must still be rooted.
}

private class BigObject
{
    private byte[] LotsOfMemory = new byte[Int32.MaxValue / 4];

    public BigObject()
    {
        Console.WriteLine("BigObject()");
    }

    ~BigObject()
    {
        Console.WriteLine("~BigObject()");
    }

    public void SomeMethod()
    {
        Console.WriteLine("Begin SomeMethod");
        GC.Collect();
        GC.WaitForPendingFinalizers();
        Console.WriteLine("End SomeMethod");
    }
}

On my machine the finalizer is run while SomeMethod is still executing!

Unique device identification

I have following idea how you can deal with such Access Device ID (ADID):

Gen ADID

  • prepare web-page https://mypage.com/manager-login where trusted user e.g. Manager can login from device - that page should show button "Give access to this device"
  • when user press button, page send request to server to generate ADID
  • server gen ADID, store it on whitelist and return to page
  • then page store it in device localstorage
  • trusted user now logout.

Use device

  • Then other user e.g. Employee using same device go to https://mypage.com/statistics and page send to server request for statistics including parameter ADID (previous stored in localstorage)
  • server checks if the ADID is on the whitelist, and if yes then return data

In this approach, as long user use same browser and don't make device reset, the device has access to data. If someone made device-reset then again trusted user need to login and gen ADID.

You can even create some ADID management system for trusted user where on generate ADID he can also input device serial-number and in future in case of device reset he can find this device and regenerate ADID for it (which not increase whitelist size) and he can also drop some ADID from whitelist for devices which he will not longer give access to server data.

In case when sytem use many domains/subdomains te manager after login should see many "Give access from domain xyz.com to this device" buttons - each button will redirect device do proper domain, gent ADID and redirect back.

UPDATE

Simpler approach based on links:

  • Manager login to system using any device and generate ONE-TIME USE LINK https://mypage.com/access-link/ZD34jse24Sfses3J (which works e.g. 24h).
  • Then manager send this link to employee (or someone else; e.g. by email) which put that link into device and server returns ADID to device which store it in Local Storage. After that link above stops working - so only the system and device know ADID
  • Then employee using this device can read data from https://mypage.com/statistics because it has ADID which is on servers whitelist

What is difference between Axios and Fetch?

  1. Fetch API, need to deal with two promises to get the response data in JSON Object property. While axios result into JSON object.

  2. Also error handling is different in fetch, as it does not handle server side error in the catch block, the Promise returned from fetch() won’t reject on HTTP error status even if the response is an HTTP 404 or 500. Instead, it will resolve normally (with ok status set to false), and it will only reject on network failure or if anything prevented the request from completing. While in axios you can catch all error in catch block.

I will say better to use axios, straightforward to handle interceptors, headers config, set cookies and error handling.

Refer this

Why use HttpClient for Synchronous Connection

In my case the accepted answer did not work. I was calling the API from an MVC application which had no async actions.

This is how I managed to make it work:

private static readonly TaskFactory _myTaskFactory = new TaskFactory(CancellationToken.None, TaskCreationOptions.None, TaskContinuationOptions.None, TaskScheduler.Default);
public static T RunSync<T>(Func<Task<T>> func)
    {           
        CultureInfo cultureUi = CultureInfo.CurrentUICulture;
        CultureInfo culture = CultureInfo.CurrentCulture;
        return _myTaskFactory.StartNew<Task<T>>(delegate
        {
            Thread.CurrentThread.CurrentCulture = culture;
            Thread.CurrentThread.CurrentUICulture = cultureUi;
            return func();
        }).Unwrap<T>().GetAwaiter().GetResult();
    }

Then I called it like this:

Helper.RunSync(new Func<Task<ReturnTypeGoesHere>>(async () => await AsyncCallGoesHere(myparameter)));

Bootstrap col-md-offset-* not working

In bootstrap 3 the format is

col-md-6 col-md-offset-3

For the same grid in Bootstrap 4 the format is

col-md-6 offset-md-3

How to use Typescript with native ES6 Promises

If you use node.js 0.12 or above / typescript 1.4 or above, just add compiler options like:

tsc a.ts --target es6 --module commonjs

More info: https://github.com/Microsoft/TypeScript/wiki/Compiler-Options

If you use tsconfig.json, then like this:

{
    "compilerOptions": {
        "module": "commonjs",
        "target": "es6"
    }
}

More info: https://github.com/Microsoft/TypeScript/wiki/tsconfig.json

How to get all the AD groups for a particular user?

The following example is from the Code Project article, (Almost) Everything In Active Directory via C#:

// userDn is a Distinguished Name such as:
// "LDAP://CN=Joe Smith,OU=Sales,OU=domain,OU=com"
public ArrayList Groups(string userDn, bool recursive)
{
    ArrayList groupMemberships = new ArrayList();
    return AttributeValuesMultiString("memberOf", userDn,
        groupMemberships, recursive);
}

public ArrayList AttributeValuesMultiString(string attributeName,
     string objectDn, ArrayList valuesCollection, bool recursive)
{
    DirectoryEntry ent = new DirectoryEntry(objectDn);
    PropertyValueCollection ValueCollection = ent.Properties[attributeName];
    IEnumerator en = ValueCollection.GetEnumerator();

    while (en.MoveNext())
    {
        if (en.Current != null)
        {
            if (!valuesCollection.Contains(en.Current.ToString()))
            {
                valuesCollection.Add(en.Current.ToString());
                if (recursive)
                {
                    AttributeValuesMultiString(attributeName, "LDAP://" +
                    en.Current.ToString(), valuesCollection, true);
                }
            }
        }
    }
    ent.Close();
    ent.Dispose();
    return valuesCollection;
}

Just call the Groups method with the Distinguished Name for the user, and pass in the bool flag to indicate if you want to include nested / child groups memberships in your resulting ArrayList:

ArrayList groups = Groups("LDAP://CN=Joe Smith,OU=Sales,OU=domain,OU=com", true);
foreach (string groupName in groups)
{
    Console.WriteLine(groupName);
}

If you need to do any serious level of Active Directory programming in .NET I highly recommend bookmarking & reviewing the Code Project article I mentioned above.

MySQL Data Source not appearing in Visual Studio

Just struggled with Visutal Studio 2017 Community Edition - none of above options worked for me. In my case what i had to do was:

  1. Run MySQL Installer and install/upgrade: Connector/NET and MySQL for Visual Studio to current versions (8.0.17 and 1.2.8 at the time)

  2. Run Visual Studio Installer > Visual Studio Community 2017 > Modify > Individual components > add .NET Framework Targeting Packs for 4.6.2, 4.7, 4.7.1 and 4.7.2

  3. Reopen project and change project target platform to 4.7.2

  4. Remove all MySQL-related nuGET packages and references

  5. Install following nuGET packages: EntityFramework, MySql.Data.Entity, Mysql.Data.Entities

  6. Upgrade following nuGET packages: MySql.Data, BouncyCastle nad Google.Protobuf (for some reason there is an update available just after install)

PHP: How to use array_filter() to filter array keys?

PHP 5.6 introduced a third parameter to array_filter(), flag, that you can set to ARRAY_FILTER_USE_KEY to filter by key instead of value:

$my_array = ['foo' => 1, 'hello' => 'world'];
$allowed  = ['foo', 'bar'];
$filtered = array_filter(
    $my_array,
    function ($key) use ($allowed) {
        return in_array($key, $allowed);
    },
    ARRAY_FILTER_USE_KEY
);

Clearly this isn't as elegant as array_intersect_key($my_array, array_flip($allowed)), but it does offer the additional flexibility of performing an arbitrary test against the key, e.g. $allowed could contain regex patterns instead of plain strings.

You can also use ARRAY_FILTER_USE_BOTH to have both the value and the key passed to your filter function. Here's a contrived example based upon the first, but note that I'd not recommend encoding filtering rules using $allowed this way:

$my_array = ['foo' => 1, 'bar' => 'baz', 'hello' => 'wld'];
$allowed  = ['foo' => true, 'bar' => true, 'hello' => 'world'];
$filtered = array_filter(
    $my_array,
    function ($val, $key) use ($allowed) { // N.b. $val, $key not $key, $val
        return isset($allowed[$key]) && (
            $allowed[$key] === true || $allowed[$key] === $val
        );
    },
    ARRAY_FILTER_USE_BOTH
); // ['foo' => 1, 'bar' => 'baz']

How to define multiple CSS attributes in jQuery?

Better to just use .addClass() and .removeClass() even if you have 1 or more styles to change. It's more maintainable and readable.

If you really have the urge to do multiple CSS properties, then use the following:

.css({
   'font-size' : '10px',
   'width' : '30px',
   'height' : '10px'
});

NB!
Any CSS properties with a hyphen need to be quoted.
I've placed the quotes so no one will need to clarify that, and the code will be 100% functional.

How to Split Image Into Multiple Pieces in Python

As an alternative to other solutions, we will construct the tiles by generating a grid of coordinates using itertools.product. We will ignore partial tiles on the edges, only iterating through the Cartesian product between the two intervals, i.e. range(0, h-h%d, d) X range(0, w-w%d, d).

Given fp: the file name to the image, d: the tile size, opt.path: the path to the directory containing the images, and opt.out: is the directory where tiles will be outputted:

def tile(filename, dir_in, dir_out, d):
    name, ext = os.path.splitext(filename)
    img = Image.open(os.path.join(dir_in, fp))
    w, h = img.size
    
    grid = list(product(range(0, h-h%d, d), range(0, w-w%d, d)))
    for i, j in grid:
        box = (j, i, j+d, i+d)
        out = os.path.join(dir_out, f'{name}_{i}_{j}{ext}')
        img.crop(box).save(out)

enter image description here

How to take the first N items from a generator or list?

In my taste, it's also very concise to combine zip() with xrange(n) (or range(n) in Python3), which works nice on generators as well and seems to be more flexible for changes in general.

# Option #1: taking the first n elements as a list
[x for _, x in zip(xrange(n), generator)]

# Option #2, using 'next()' and taking care for 'StopIteration'
[next(generator) for _ in xrange(n)]

# Option #3: taking the first n elements as a new generator
(x for _, x in zip(xrange(n), generator))

# Option #4: yielding them by simply preparing a function
# (but take care for 'StopIteration')
def top_n(n, generator):
    for _ in xrange(n): yield next(generator)

ValueError: could not broadcast input array from shape (224,224,3) into shape (224,224)

@aravk33 's answer is absolutely correct.

I was going through the same problem. I had a data set of 2450 images. I just could not figure out why I was facing this issue.

Check the dimensions of all the images in your training data.

Add the following snippet while appending your image into your list:

if image.shape==(1,512,512):
    trainx.append(image)

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

---- in form level Declaration of cbx veriable---

Dim cbx as string

Private Sub comboBox1_Enter(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles comboBox1.Enter
    cbx = Me.comboBox1.Text
End Sub

Private Sub comboBox1_Leave(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles comboBox1.Leave
    Me.comboBox1.Text = cbx
End Sub

How can I convert a string to an int in Python?

Since you're writing a calculator that would presumably also accept floats (1.5, 0.03), a more robust way would be to use this simple helper function:

def convertStr(s):
    """Convert string to either int or float."""
    try:
        ret = int(s)
    except ValueError:
        #Try float.
        ret = float(s)
    return ret

That way if the int conversion doesn't work, you'll get a float returned.

Edit: Your division function might also result in some sad faces if you aren't fully aware of how python 2.x handles integer division.

In short, if you want 10/2 to equal 2.5 and not 2, you'll need to do from __future__ import division or cast one or both of the arguments to float, like so:

def division(a, b):
    return float(a) / float(b)

How can I give the Intellij compiler more heap space?

Current version:

Settings (Preferences on Mac) | Build, Execution, Deployment | Compiler | Build process heap size.

Older versions:

Settings (Preferences on Mac) | Compiler | Java Compiler | Maximum heap size.

Compiler runs in a separate JVM by default so IDEA heap settings that you set in idea.vmoptions have no effect on the compiler.

How to display gpg key details without importing it?

To verify and list the fingerprint of the key (without importing it into the keyring first), type

gpg --with-fingerprint <filename>

Edit: on Ubuntu 18.04 (gpg 2.2.4) the fingerprint isn't show with the above command. Use the --with-subkey-fingerprint option instead

gpg --with-subkey-fingerprint <filename>

Solution for "Fatal error: Maximum function nesting level of '100' reached, aborting!" in PHP

Rather than going for a recursive function calls, work with a queue model to flatten the structure.

$queue = array('http://example.com/first/url');
while (count($queue)) {
    $url = array_shift($queue);

    $queue = array_merge($queue, find_urls($url));
}

function find_urls($url)
{
    $urls = array();

    // Some logic filling the variable

    return $urls;
}

There are different ways to handle it. You can keep track of more information if you need some insight about the origin or paths traversed. There are also distributed queues that can work off a similar model.

How to jump back to NERDTree from file in tab?

NERDTree opens up in another window. That split view you're seeing? They're called windows in vim parlance. All the window commands start with CTRL-W. To move from adjacent windows that are left and right of one another, you can change focus to the window to the left of your current window with CTRL-w h, and move focus to the right with CTRL-w l. Likewise, CTRL-w j and CTRL-w k will move you between horizontally split windows (i.e., one window is above the other). There's a lot more you can do with windows as described here.

You can also use the :NERDTreeToggle command to make your tree open and close. I usually bind that do t.

Push git commits & tags simultaneously

Git GUI

Git GUI has a PUSH button - pardon the pun, and the dialog box it opens has a checkbox for tags.

I pushed a branch from the command line, without tags, and then tried again pushing the branch using the --follow-tags option descibed above. The option is described as following annotated tags. My tags were simple tags.

I'd fixed something, tagged the commit with the fix in, (so colleagues can cherry pick the fix,) then changed the software version number and tagged the release I created (so colleagues can clone that release).

Git returned saying everything was up-to-date. It did not send the tags! Perhaps because the tags weren't annotated. Perhaps because there was nothing new on the branch.

When I did a similar push with Git GUI, the tags were sent.

Tags sent with Git GUI

For the time being, I am going to be pushing my changes to my remotes with Git GUI and not with the command line and --follow-tags.

git: can't push (unpacker error) related to permission issues

For what it worth, I had the same problem over my own VPS and it was caused by my low hard disk space on VPS. Confirmed by df -h command and after i cleaned up my VPS' hard disk; the problem was gone.

Cheers.

IntelliJ and Tomcat.. Howto..?

Please verify that the required plug-ins are enabled in Settings | Plugins, most likely you've disabled several of them, that's why you don't see all the facet options.

For the step by step tutorial, see: Creating a simple Web application and deploying it to Tomcat.

Node.js - use of module.exports as a constructor

The example code is:

in main

square(width,function (data)
{
   console.log(data.squareVal);
});

using the following may works

exports.square = function(width,callback)
{
     var aa = new Object();
     callback(aa.squareVal = width * width);    
}

How to set order of repositories in Maven settings.xml

None of these answers were correct in my case.. the order seems dependent on the alphabetical ordering of the <id> tag, which is an arbitrary string. Hence this forced repo search order:

            <repository>
                <id>1_maven.apache.org</id>
                <releases>  <enabled>true</enabled>  </releases>
                <snapshots> <enabled>true</enabled> </snapshots>
                <url>https://repo.maven.apache.org/maven2</url>
                <layout>default</layout>
            </repository>

            <repository>
                <id>2_maven.oracle.com</id>
                <releases>  <enabled>true</enabled>  </releases>
                <snapshots> <enabled>false</enabled> </snapshots>
                <url>https://maven.oracle.com</url>
                <layout>default</layout>
            </repository>

How to save Excel Workbook to Desktop regardless of user?

I think this is the most reliable way to get the desktop path which isn't always the same as the username.

MsgBox CreateObject("WScript.Shell").specialfolders("Desktop")

Decompile .smali files on an APK

I second that.

Dex2jar will generate a WORKING jar, which you can add as your project source, with the xmls you got from apktool.

However, JDGUI generates .java files which have ,more often than not, errors.

It has got something to do with code obfuscation I guess.

Pinging servers in Python

There is a module called pyping that can do this. It can be installed with pip

pip install pyping

It is pretty simple to use, however, when using this module, you need root access due to the fact that it is crafting raw packets under the hood.

import pyping

r = pyping.ping('google.com')

if r.ret_code == 0:
    print("Success")
else:
    print("Failed with {}".format(r.ret_code))

Escaping special characters in Java Regular Expressions

Is there any method in Java or any open source library for escaping (not quoting) a special character (meta-character), in order to use it as a regular expression?

If you are looking for a way to create constants that you can use in your regex patterns, then just prepending them with "\\" should work but there is no nice Pattern.escape('.') function to help with this.

So if you are trying to match "\\d" (the string \d instead of a decimal character) then you would do:

// this will match on \d as opposed to a decimal character
String matchBackslashD = "\\\\d";
// as opposed to
String matchDecimalDigit = "\\d";

The 4 slashes in the Java string turn into 2 slashes in the regex pattern. 2 backslashes in a regex pattern matches the backslash itself. Prepending any special character with backslash turns it into a normal character instead of a special one.

matchPeriod = "\\.";
matchPlus = "\\+";
matchParens = "\\(\\)";
... 

In your post you use the Pattern.quote(string) method. This method wraps your pattern between "\\Q" and "\\E" so you can match a string even if it happens to have a special regex character in it (+, ., \\d, etc.)

How to run python script on terminal (ubuntu)?

This error:

python: can't open file 'test.py': [Errno 2] No such file or directory

Means that the file "test.py" doesn't exist. (Or, it does, but it isn't in the current working directory.)

I must save the file in any specific folder to make it run on terminal?

No, it can be where ever you want. However, if you just say, "test.py", you'll need to be in the directory containing test.py.

Your terminal (actually, the shell in the terminal) has a concept of "Current working directory", which is what directory (folder) it is currently "in".

Thus, if you type something like:

python test.py

test.py needs to be in the current working directory. In Linux, you can change the current working directory with cd. You might want a tutorial if you're new. (Note that the first hit on that search for me is this YouTube video. The author in the video is using a Mac, but both Mac and Linux use bash for a shell, so it should apply to you.)

Java Date vs Calendar

I generally use Date if possible. Although it is mutable, the mutators are actually deprecated. In the end it basically wraps a long that would represent the date/time. Conversely, I would use Calendars if I have to manipulate the values.

You can think of it this way: you only use StringBuffer only when you need to have Strings that you can easily manipulate and then convert them into Strings using toString() method. In the same way, I only use Calendar if I need to manipulate temporal data.

For best practice, I tend to use immutable objects as much as possible outside of the domain model. It significantly reduces the chances of any side effects and it is done for you by the compiler, rather than a JUnit test. You use this technique by creating private final fields in your class.

And coming back to the StringBuffer analogy. Here is some code that shows you how to convert between Calendar and Date

String s = "someString"; // immutable string
StringBuffer buf = new StringBuffer(s); // mutable "string" via StringBuffer
buf.append("x");
assertEquals("someStringx", buf.toString()); // convert to immutable String

// immutable date with hard coded format.  If you are hard
// coding the format, best practice is to hard code the locale
// of the format string, otherwise people in some parts of Europe
// are going to be mad at you.
Date date =     new SimpleDateFormat("yyyy-MM-dd", Locale.ENGLISH).parse("2001-01-02");

// Convert Date to a Calendar
Calendar cal = Calendar.getInstance();
cal.setTime(date);

// mutate the value
cal.add(Calendar.YEAR, 1);

// convert back to Date
Date newDate = cal.getTime();

// 
assertEquals(new SimpleDateFormat("yyyy-MM-dd", Locale.ENGLISH).parse("2002-01-02"), newDate);

Create a view with ORDER BY clause

Just use TOP 100 Percent in the Select:

     CREATE VIEW [schema].[VIEWNAME] (
         [COLUMN1],
         [COLUMN2],
         [COLUMN3],
         [COLUMN4])
     AS 
        SELECT TOP 100 PERCENT 
         alias.[COLUMN1],
         alias.[COLUMN2],
         alias.[COLUMN3],
         alias.[COLUMN4]
        FROM 
           [schema].[TABLENAME] AS alias
          ORDER BY alias.COLUMN1
     GO

GridLayout and Row/Column Span Woe

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <GridLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:columnCount="8"
        android:rowCount="7" >

        <TextView
            android:layout_width="50dip"
            android:layout_height="50dip"
            android:layout_columnSpan="2"
            android:layout_rowSpan="2"
            android:background="#a30000"
            android:gravity="center"
            android:text="1"
            android:textColor="@android:color/white"
            android:textSize="20dip" />

        <TextView
            android:layout_width="50dip"
            android:layout_height="25dip"
            android:layout_columnSpan="2"
            android:layout_rowSpan="1"
            android:background="#0c00a3"
            android:gravity="center"
            android:text="2"
            android:textColor="@android:color/white"
            android:textSize="20dip" />

        <TextView
            android:layout_width="25dip"
            android:layout_height="100dip"
            android:layout_columnSpan="1"
            android:layout_rowSpan="4"
            android:background="#00a313"
            android:gravity="center"
            android:text="3"
            android:textColor="@android:color/white"
            android:textSize="20dip" />

        <TextView
            android:layout_width="75dip"
            android:layout_height="50dip"
            android:layout_columnSpan="3"
            android:layout_rowSpan="2"
            android:background="#a29100"
            android:gravity="center"
            android:text="4"
            android:textColor="@android:color/white"
            android:textSize="20dip" />

        <TextView
            android:layout_width="75dip"
            android:layout_height="25dip"
            android:layout_columnSpan="3"
            android:layout_rowSpan="1"
            android:background="#a500ab"
            android:gravity="center"
            android:text="5"
            android:textColor="@android:color/white"
            android:textSize="20dip" />

        <TextView
            android:layout_width="50dip"
            android:layout_height="25dip"
            android:layout_columnSpan="2"
            android:layout_rowSpan="1"
            android:background="#00a9ab"
            android:gravity="center"
            android:text="6"
            android:textColor="@android:color/white"
            android:textSize="20dip" />
    </GridLayout>

</RelativeLayout>

ScreenShot

What is the difference between a static and a non-static initialization code block

Uff! what is static initializer?

The static initializer is a static {} block of code inside java class, and run only one time before the constructor or main method is called.

OK! Tell me more...

  • is a block of code static { ... } inside any java class. and executed by virtual machine when class is called.
  • No return statements are supported.
  • No arguments are supported.
  • No this or super are supported.

Hmm where can I use it?

Can be used anywhere you feel ok :) that simple. But I see most of the time it is used when doing database connection, API init, Logging and etc.

Don't just bark! where is example?

package com.example.learnjava;

import java.util.ArrayList;

public class Fruit {

    static {
        System.out.println("Inside Static Initializer.");

        // fruits array
        ArrayList<String> fruits = new ArrayList<>();
        fruits.add("Apple");
        fruits.add("Orange");
        fruits.add("Pear");

        // print fruits
        for (String fruit : fruits) {
            System.out.println(fruit);
        }
        System.out.println("End Static Initializer.\n");
    }

    public static void main(String[] args) {
        System.out.println("Inside Main Method.");
    }
}

Output???

Inside Static Initializer.

Apple

Orange

Pear

End Static Initializer.

Inside Main Method.

Hope this helps!

error 1265. Data truncated for column when trying to load data from txt file

You're missing FIELDS TERMINATED BY ',' and it's assuming you're delimiting by tabs by default.

How to clean old dependencies from maven repositories?

I wanted to remove old dependencies from my Maven repository as well. I thought about just running Florian's answer, but I wanted something that I could run over and over without remembering a long linux snippet, and I wanted something with a little bit of configurability -- more of a program, less of a chain of unix commands, so I took the base idea and made it into a (relatively small) Ruby program, which removes old dependencies based on their last access time.

It doesn't remove "old versions" but since you might actually have two different active projects with two different versions of a dependency, that wouldn't have done what I wanted anyway. Instead, like Florian's answer, it removes dependencies that haven't been accessed recently.

If you want to try it out, you can:

  1. Visit the GitHub repository
  2. Clone the repository, or download the source
  3. Optionally inspect the code to make sure it's not malicious
  4. Run bin/mvnclean

There are options to override the default Maven repository, ignore files, set the threshold date, but you can read those in the README on GitHub.

I'll probably package it as a Ruby gem at some point after I've done a little more work on it, which will simplify matters (gem install mvnclean; mvnclean) if you already have Ruby installed and operational.

How to create a dump with Oracle PL/SQL Developer?

EXP (export) and IMP (import) are the two tools you need. It's is better to try to run these on the command line and on the same machine.

It can be run from remote, you just need to setup you TNSNAMES.ORA correctly and install all the developer tools with the same version as the database. Without knowing the error message you are experiencing then I can't help you to get exp/imp to work.

The command to export a single user:

exp userid=dba/dbapassword OWNER=username DIRECT=Y FILE=filename.dmp

This will create the export dump file.

To import the dump file into a different user schema, first create the newuser in SQLPLUS:

SQL> create user newuser identified by 'password' quota unlimited users;

Then import the data:

imp userid=dba/dbapassword FILE=filename.dmp FROMUSER=username TOUSER=newusername

If there is a lot of data then investigate increasing the BUFFERS or look into expdp/impdp

Most common errors for exp and imp are setup. Check your PATH includes $ORACLE_HOME/bin, check $ORACLE_HOME is set correctly and check $ORACLE_SID is set

Pandas split DataFrame by column value

You can use boolean indexing:

df = pd.DataFrame({'Sales':[10,20,30,40,50], 'A':[3,4,7,6,1]})
print (df)
   A  Sales
0  3     10
1  4     20
2  7     30
3  6     40
4  1     50

s = 30

df1 = df[df['Sales'] >= s]
print (df1)
   A  Sales
2  7     30
3  6     40
4  1     50

df2 = df[df['Sales'] < s]
print (df2)
   A  Sales
0  3     10
1  4     20

It's also possible to invert mask by ~:

mask = df['Sales'] >= s
df1 = df[mask]
df2 = df[~mask]
print (df1)
   A  Sales
2  7     30
3  6     40
4  1     50

print (df2)
   A  Sales
0  3     10
1  4     20

print (mask)
0    False
1    False
2     True
3     True
4     True
Name: Sales, dtype: bool

print (~mask)
0     True
1     True
2    False
3    False
4    False
Name: Sales, dtype: bool

Where is NuGet.Config file located in Visual Studio project?

I have created an answer for this post that might help: https://stackoverflow.com/a/63816822/2399164

Summary:

I am a little late to the game but I believe I found a simple solution to this problem...

  1. Create a "NuGet.Config" file in the same directory as your .sln
<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <packageSources>
    <add key="nuget.org" value="https://api.nuget.org/v3/index.json" protocolVersion="3" />
    <add key="{{CUSTOM NAME}}" value="{{CUSTOM SOURCE}}" />
  </packageSources>
  <packageRestore>
    <add key="enabled" value="True" />
    <add key="automatic" value="True" />
  </packageRestore>
  <bindingRedirects>
    <add key="skip" value="False" />
  </bindingRedirects>
  <packageManagement>
    <add key="format" value="0" />
    <add key="disabled" value="False" />
  </packageManagement>
</configuration>
  1. That is it! Create your "Dockerfile" here as well

  2. Run docker build with your Dockerfile and all will get resolved

If Browser is Internet Explorer: run an alternative script instead

this code works well on my site because it detects whether its ie or not and activates the javascript if it is its below you can check it out live on ie or other browser Just a demo of the if ie javascript in action

<script type="text/javascript">
<!--[if IE]>
window.location.href = "http://yoursite.com/";
<![endif]-->
</script>

Implementing Singleton with an Enum (in Java)

Like all enum instances, Java instantiates each object when the class is loaded, with some guarantee that it's instantiated exactly once per JVM. Think of the INSTANCE declaration as a public static final field: Java will instantiate the object the first time the class is referred to.

The instances are created during static initialization, which is defined in the Java Language Specification, section 12.4.

For what it's worth, Joshua Bloch describes this pattern in detail as item 3 of Effective Java Second Edition.

How to import a new font into a project - Angular 5

You need to put the font files in assets folder (may be a fonts sub-folder within assets) and refer to it in the styles:

@font-face {
  font-family: lato;
  src: url(assets/font/Lato.otf) format("opentype");
}

Once done, you can apply this font any where like:

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'lato', 'arial', sans-serif;
}

You can put the @font-face definition in your global styles.css or styles.scss and you would be able to refer to the font anywhere - even in your component specific CSS/SCSS. styles.css or styles.scss is already defined in angular-cli.json. Or, if you want you can create a separate CSS/SCSS file and declare it in angular-cli.json along with the styles.css or styles.scss like:

"styles": [
  "styles.css",
  "fonts.css"
],

WPF ListView turn off selection

Moore's answer doesn't work, and the page here:

Specifying the Selection Color, Content Alignment, and Background Color for items in a ListBox

explains why it cannot work.

If your listview only contains basic text, the simplest way to solve the problem is by using transparent brushes.

<Window.Resources>
  <Style TargetType="{x:Type ListViewItem}">
    <Style.Resources>
      <SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" Color="#00000000"/>
      <SolidColorBrush x:Key="{x:Static SystemColors.ControlBrushKey}" Color="#00000000"/>
    </Style.Resources>
  </Style>
</Window.Resources>

This will produce undesirable results if the listview's cells are holding controls such as comboboxes, since it also changes their color. To solve this problem, you must redefine the control's template.

  <Window.Resources>
    <Style TargetType="{x:Type ListViewItem}">
      <Setter Property="Template">
        <Setter.Value>
          <ControlTemplate TargetType="{x:Type ListViewItem}">
            <Border SnapsToDevicePixels="True" 
                    x:Name="Bd" 
                    Background="{TemplateBinding Background}" 
                    BorderBrush="{TemplateBinding BorderBrush}" 
                    BorderThickness="{TemplateBinding BorderThickness}" 
                    Padding="{TemplateBinding Padding}">
              <GridViewRowPresenter SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" 
                                    VerticalAlignment="{TemplateBinding VerticalContentAlignment}" 
                                    Columns="{TemplateBinding GridView.ColumnCollection}" 
                                    Content="{TemplateBinding Content}"/>
            </Border>
            <ControlTemplate.Triggers>
              <Trigger Property="IsEnabled" 
                       Value="False">
                <Setter Property="Foreground" 
                        Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
              </Trigger>
            </ControlTemplate.Triggers>
          </ControlTemplate>
        </Setter.Value>
      </Setter>
    </Style>
  </Window.Resources>

Android emulator-5554 offline

Simply delete and created gear avd again.It will work.

Detect if a browser in a mobile device (iOS/Android phone/tablet) is used

Simple! Throw this at the like, bottom of your CSS file and this part of the CSS will be modified within a phone: -

/* ON A PHONE */
@media only screen and (max-width: 600px) { /* CSS HERE ONLY ON PHONE */ }

And voila!

ImportError: No Module Named bs4 (BeautifulSoup)

You might want to try install bs4 with

pip install --ignore-installed BeautifulSoup4

if the methods above didn't work for you.

How to print something to the console in Xcode?

In some environments, NSLog() will be unresponsive. But there are other ways to get output...

NSString* url = @"someurlstring";
printf("%s", [url UTF8String]);

By using printf with the appropriate parameters, we can display things this way. This is the only way I have found to work on online Objective-C sandbox environments.

PHP if not statements

No matter what $action is, it will always either not be "add" OR not be "delete", which is why the if condition always passes. What you want is to use && instead of ||:

(!isset($action)) || ($action !="add" && $action !="delete"))

Output to the same line overwriting previous output?

to overwiting the previous line in python all wath you need is to add end='\r' to the print function, test this example:

import time
for j in range(1,5):
   print('waiting : '+j, end='\r')
   time.sleep(1)

No signing certificate "iOS Distribution" found

Double click and install the production certificate in your key chain. This might resolve the issue.

Go to beginning of line without opening new line in VI

A simple 0 takes you to the beginning of a line.

:help 0 for more information

How to make a new List in Java

Let me summarize and add something:

JDK

1. new ArrayList<String>();
2. Arrays.asList("A", "B", "C")

Guava

1. Lists.newArrayList("Mike", "John", "Lesly");
2. Lists.asList("A","B", new String [] {"C", "D"});

Immutable List

1. Collections.unmodifiableList(new ArrayList<String>(Arrays.asList("A","B")));
2. ImmutableList.builder()                                      // Guava
            .add("A")
            .add("B").build();
3. ImmutableList.of("A", "B");                                  // Guava
4. ImmutableList.copyOf(Lists.newArrayList("A", "B", "C"));     // Guava

Empty immutable List

1. Collections.emptyList();
2. Collections.EMPTY_LIST;

List of Characters

1. Lists.charactersOf("String")                                 // Guava
2. Lists.newArrayList(Splitter.fixedLength(1).split("String"))  // Guava

List of Integers

Ints.asList(1,2,3);                                             // Guava

EF Core add-migration Build Failed

Just got into this issue. In my case, I was debugging my code and it was making my migrations fail.

Since in Visual Studio Code, the debugger is so low-profile (only a small bar), I didn't realize about this until I read some questions and decided to look better.

How to create a simple checkbox in iOS?

Yeah, no checkbox for you in iOS (-:

Here, this is what I did to create a checkbox:

UIButton *checkbox;
BOOL checkBoxSelected;
checkbox = [[UIButton alloc] initWithFrame:CGRectMake(x,y,20,20)];
// 20x20 is the size of the checkbox that you want
// create 2 images sizes 20x20 , one empty square and
// another of the same square with the checkmark in it
// Create 2 UIImages with these new images, then:

[checkbox setBackgroundImage:[UIImage imageNamed:@"notselectedcheckbox.png"]
                    forState:UIControlStateNormal];
[checkbox setBackgroundImage:[UIImage imageNamed:@"selectedcheckbox.png"]
                    forState:UIControlStateSelected];
[checkbox setBackgroundImage:[UIImage imageNamed:@"selectedcheckbox.png"]
                    forState:UIControlStateHighlighted];
checkbox.adjustsImageWhenHighlighted=YES;
[checkbox addTarget:(nullable id) action:(nonnull SEL) forControlEvents:(UIControlEvents)];
[self.view addSubview:checkbox];

Now in the target method do the following:

-(void)checkboxSelected:(id)sender
{
    checkBoxSelected = !checkBoxSelected; /* Toggle */
    [checkbox setSelected:checkBoxSelected];
}

That's it!

ImportError: No module named PIL

On windows 10 I managed to get there with:

cd "C:\Users\<your username>\AppData\Local\Programs\Python\Python37-32" 
python -m pip install --upgrade pip     <-- upgrading from 10.something to 19.2.2.
pip3 uninstall pillow
pip3 uninstall PIL
pip3 install image

after which in python (python 3.7 in my case) this works fine...

import PIL
from PIL import image

Use of Finalize/Dispose method in C#

Using lambdas instead of IDisposable.

I have never been thrilled with the whole using/IDisposable idea. The problem is that it requires the caller to:

  • know that they must use IDisposable
  • remember to use 'using'.

My new preferred method is to use a factory method and a lambda instead

Imagine I want to do something with a SqlConnection (something that should be wrapped in a using). Classically you would do

using (Var conn = Factory.MakeConnection())
{
     conn.Query(....);
}

New way

Factory.DoWithConnection((conn)=>
{
    conn.Query(...);
}

In the first case the caller could simply not use the using syntax. IN the second case the user has no choice. There is no method that creates a SqlConnection object, the caller must invoke DoWithConnection.

DoWithConnection looks like this

void DoWithConnection(Action<SqlConnection> action)
{
   using (var conn = MakeConnection())
   {
       action(conn);
   }
}

MakeConnection is now private

No provider for Http StaticInjectorError

In order to use Http in your app you will need to add the HttpModule to your app.module.ts:

import { BrowserModule } from '@angular/platform-browser';
import { NgModule, ErrorHandler } from '@angular/core';
import { HttpModule } from '@angular/http';
...
  imports: [
    BrowserModule,
    HttpModule,
    IonicModule.forRoot(MyApp),
    IonicStorageModule.forRoot()
  ]

EDIT

As mentioned in the comment below, HttpModule is deprecated now, use import { HttpClientModule } from '@angular/common/http'; Make sure HttpClientModule in your imports:[] array

How to build query string with Javascript

For those of us who prefer jQuery, you would use the form plugin: http://plugins.jquery.com/project/form, which contains a formSerialize method.

How to use background thread in swift?

Swift 4.x

Put this in some file:

func background(work: @escaping () -> ()) {
    DispatchQueue.global(qos: .userInitiated).async {
        work()
    }
}

func main(work: @escaping () -> ()) {
    DispatchQueue.main.async {
        work()
    }
}

and then call it where you need:

background {
     //background job
     main {
       //update UI (or what you need to do in main thread)
     }
}

HTML - how can I show tooltip ONLY when ellipsis is activated

Here is my jQuery plugin:

(function($) {
    'use strict';
    $.fn.tooltipOnOverflow = function() {
        $(this).on("mouseenter", function() {
            if (this.offsetWidth < this.scrollWidth) {
                $(this).attr('title', $(this).text());
            } else {
                $(this).removeAttr("title");
            }
        });
    };
})(jQuery);

Usage:

$("td, th").tooltipOnOverflow();

Edit:

I have made a gist for this plugin. https://gist.github.com/UziTech/d45102cdffb1039d4415

How to add footnotes to GitHub-flavoured Markdown?

This works for me:

blablabla [<sup>1</sup>](#1) blablabla

footnotes: reference to blablabla <a class="anchor" id="1"></a>

How to Apply Gradient to background view of iOS Swift App

Xcode 11 | Swift 5

If anybody is looking for a quick and easy way to add a gradient to a view:

extension UIView {
    
    func addGradient(colors: [UIColor] = [.blue, .white], locations: [NSNumber] = [0, 2], startPoint: CGPoint = CGPoint(x: 0.0, y: 1.0), endPoint: CGPoint = CGPoint(x: 1.0, y: 1.0), type: CAGradientLayerType = .axial){
        
        let gradient = CAGradientLayer()
        
        gradient.frame.size = self.frame.size
        gradient.frame.origin = CGPoint(x: 0.0, y: 0.0)

        // Iterates through the colors array and casts the individual elements to cgColor
        // Alternatively, one could use a CGColor Array in the first place or do this cast in a for-loop
        gradient.colors = colors.map{ $0.cgColor }
        
        gradient.locations = locations
        gradient.startPoint = startPoint
        gradient.endPoint = endPoint
        
        // Insert the new layer at the bottom-most position
        // This way we won't cover any other elements
        self.layer.insertSublayer(gradient, at: 0)
    }
}



Examples on how to use the extension:

// Testing
view.addGradient()
        
// Two Colors
view.addGradient(colors: [.init(rgb: 0x75BBDB), .black], locations: [0, 3])
        
// Full Blown
view.addGradient(colors: [.init(rgb: 0x75BBDB), .black], locations: [0, 3], startPoint: CGPoint(x: 0.0, y: 1.5), endPoint: CGPoint(x: 1.0, y: 2.0), type: .axial)



Optionally, use the following to input hex numbers .init(rgb: 0x75BBDB)

extension UIColor {
   convenience init(red: Int, green: Int, blue: Int) {
       self.init(red: CGFloat(red) / 255.0, green: CGFloat(green) / 255.0, blue: CGFloat(blue) / 255.0, alpha: 1.0)
   }

   convenience init(rgb: Int) {
       self.init(
           red: (rgb >> 16) & 0xFF,
           green: (rgb >> 8) & 0xFF,
           blue: rgb & 0xFF
       )
   }
}

Getting Lat/Lng from Google marker

_x000D_
_x000D_
var map = new google.maps.Map(document.getElementById('map_canvas'), {_x000D_
  zoom: 10,_x000D_
  center: new google.maps.LatLng(13.103, 80.274),_x000D_
  mapTypeId: google.maps.MapTypeId.ROADMAP_x000D_
});_x000D_
_x000D_
var myMarker = new google.maps.Marker({_x000D_
  position: new google.maps.LatLng(18.103, 80.274),_x000D_
  draggable: true_x000D_
});_x000D_
_x000D_
google.maps.event.addListener(myMarker, 'dragend', function(evt) {_x000D_
  document.getElementById('current').innerHTML = '<p>Marker dropped: Current Lat: ' + evt.latLng.lat().toFixed(3) + ' Current Lng: ' + evt.latLng.lng().toFixed(3) + '</p>';_x000D_
});_x000D_
google.maps.event.addListener(myMarker, 'dragstart', function(evt) {_x000D_
  document.getElementById('current').innerHTML = '<p>Currently dragging marker...</p>';_x000D_
});_x000D_
map.setCenter(myMarker.position);_x000D_
myMarker.setMap(map);_x000D_
_x000D_
function getLocation() {_x000D_
  if (navigator.geolocation) {_x000D_
    navigator.geolocation.getCurrentPosition(showPosition);_x000D_
  } else {_x000D_
    x.innerHTML = "Geolocation is not supported by this browser.";_x000D_
  }_x000D_
}_x000D_
_x000D_
function showPosition(position) {_x000D_
  document.getElementById('current').innerHTML = '<p>Marker dropped: Current Lat: ' + position.coords.latitude + ' Current Lng: ' + position.coords.longitude + '</p>';_x000D_
  var myMarker = new google.maps.Marker({_x000D_
    position: new google.maps.LatLng(position.coords.latitude, position.coords.longitude),_x000D_
    draggable: true_x000D_
  });_x000D_
  google.maps.event.addListener(myMarker, 'dragend', function(evt) {_x000D_
    document.getElementById('current').innerHTML = '<p>Marker dropped: Current Lat: ' + evt.latLng.lat().toFixed(3) + ' Current Lng: ' + evt.latLng.lng().toFixed(3) + '</p>';_x000D_
  });_x000D_
  google.maps.event.addListener(myMarker, 'dragstart', function(evt) {_x000D_
    document.getElementById('current').innerHTML = '<p>Currently dragging marker...</p>';_x000D_
  });_x000D_
  map.setCenter(myMarker.position);_x000D_
  myMarker.setMap(map);_x000D_
}_x000D_
getLocation();
_x000D_
#map_canvas {_x000D_
  width: 980px;_x000D_
  height: 500px;_x000D_
}_x000D_
_x000D_
#current {_x000D_
  padding-top: 25px;_x000D_
}
_x000D_
<script src="http://maps.google.com/maps/api/js?sensor=false&.js"></script>_x000D_
<!DOCTYPE html>_x000D_
<html lang="en">_x000D_
_x000D_
<head>_x000D_
_x000D_
</head>_x000D_
_x000D_
<body>_x000D_
  <section>_x000D_
    <div id='map_canvas'></div>_x000D_
    <div id="current">_x000D_
      <p>Marker dropped: Current Lat:18.103 Current Lng:80.274</p>_x000D_
    </div>_x000D_
  </section>_x000D_
_x000D_
_x000D_
</body>_x000D_
_x000D_
</html>
_x000D_
_x000D_
_x000D_

How to enable Auto Logon User Authentication for Google Chrome

While moopasta's answer works, it doesn't appear to allow wildcards and there is another (potentially better) option. The Chromium project has some HTTP authentication documentation that is useful but incomplete.

Specifically the option that I found best is to whitelist sites that you would like to allow Chrome to pass authentication information to, you can do this by:

  • Launching Chrome with the auth-server-whitelist command line switch. e.g. --auth-server-whitelist="*example.com,*foobar.com,*baz". Downfall to this approach is that opening links from other programs will launch Chrome without the command line switch.
  • Installing, enabling, and configuring the AuthServerWhitelist/"Authentication server whitelist" Group Policy or Local Group Policy. This seems like the most stable option but takes more work to setup. You can set this up locally, no need to have this remotely deployed.

Those looking to set this up for an enterprise can likely follow the directions for using Group Policy or the Admin console to configure the AuthServerWhitelist policy. Those looking to set this up for one machine only can also follow the Group Policy instructions:

  1. Download and unzip the latest Chrome policy templates
  2. Start > Run > gpedit.msc
  3. Navigate to Local Computer Policy > Computer Configuration > Administrative Templates
  4. Right-click Administrative Templates, and select Add/Remove Templates
  5. Add the windows\adm\en-US\chrome.adm template via the dialog
  6. In Computer Configuration > Administrative Templates > Classic Administrative Templates > Google > Google Chrome > Policies for HTTP Authentication enable and configure Authentication server whitelist
  7. Restart Chrome and navigate to chrome://policy to view active policies

Received fatal alert: handshake_failure through SSLHandshakeException

Assuming you're using the proper SSL/TLS protocols, properly configured your keyStore and trustStore, and confirmed that there doesn't exist any issues with the certificates themselves, you may need to strengthen your security algorithms.

As mentioned in Vineet's answer, one possible reason you receive this error is due to incompatible cipher suites being used. By updating my local_policy and US_export_policy jars in my JDK's security folder with the ones provided in the Java Cryptography Extension (JCE), I was able to complete the handshake successfully.

How is malloc() implemented internally?

The sbrksystem call moves the "border" of the data segment. This means it moves a border of an area in which a program may read/write data (letting it grow or shrink, although AFAIK no malloc really gives memory segments back to the kernel with that method). Aside from that, there's also mmap which is used to map files into memory but is also used to allocate memory (if you need to allocate shared memory, mmap is how you do it).

So you have two methods of getting more memory from the kernel: sbrk and mmap. There are various strategies on how to organize the memory that you've got from the kernel.

One naive way is to partition it into zones, often called "buckets", which are dedicated to certain structure sizes. For example, a malloc implementation could create buckets for 16, 64, 256 and 1024 byte structures. If you ask malloc to give you memory of a given size it rounds that number up to the next bucket size and then gives you an element from that bucket. If you need a bigger area malloc could use mmap to allocate directly with the kernel. If the bucket of a certain size is empty malloc could use sbrk to get more space for a new bucket.

There are various malloc designs and there is propably no one true way of implementing malloc as you need to make a compromise between speed, overhead and avoiding fragmentation/space effectiveness. For example, if a bucket runs out of elements an implementation might get an element from a bigger bucket, split it up and add it to the bucket that ran out of elements. This would be quite space efficient but would not be possible with every design. If you just get another bucket via sbrk/mmap that might be faster and even easier, but not as space efficient. Also, the design must of course take into account that "free" needs to make space available to malloc again somehow. You don't just hand out memory without reusing it.

If you're interested, the OpenSER/Kamailio SIP proxy has two malloc implementations (they need their own because they make heavy use of shared memory and the system malloc doesn't support shared memory). See: https://github.com/OpenSIPS/opensips/tree/master/mem

Then you could also have a look at the GNU libc malloc implementation, but that one is very complicated, IIRC.

How can I autoplay a video using the new embed code style for Youtube?

Actually, you will have to use the "?" instead of "&" for your first parameter only. If you use more than one parameter, you will then have to add "&" to the chain.

For instance, if you want to add autoplay and closed captioning, you will have to add this portion to your embedded video URL: ?autoplay=1&cc_load_policy=1.

It would look like this:

<iframe width="420" height="315" src="http://www.youtube.com/embed/
oHg5SJYRHA0?autoplay=1&cc_load_policy=1" frameborder="0"
allowfullscreen></iframe>

Accessing MP3 metadata with Python

It can depend on exactly what you want to do in addition to reading the metadata. If it is just simply the bitrate / name etc. that you need, and nothing else, something lightweight is probably best.

If you're manipulating the mp3 past that PyMedia may be suitable.

There are quite a few, whatever you do get, make sure and test it out on plenty of sample media. There are a few different versions of ID3 tags in particular, so make sure it's not too out of date.

Personally I've used this small MP3Info class with luck. It is quite old though.

http://www.omniscia.org/~vivake/python/MP3Info.py

Interop type cannot be embedded

Got the solution

Go to references right click the desired dll you will get option "Embed Interop Types" to "False" or "True".

How to get last items of a list in Python?

a negative index will count from the end of the list, so:

num_list[-9:]

Converting datetime.date to UTC timestamp in Python

A complete time-string contains:

  • date
  • time
  • utcoffset [+HHMM or -HHMM]

For example:

1970-01-01 06:00:00 +0500 == 1970-01-01 01:00:00 +0000 == UNIX timestamp:3600

$ python3
>>> from datetime import datetime
>>> from calendar import timegm
>>> tm = '1970-01-01 06:00:00 +0500'
>>> fmt = '%Y-%m-%d %H:%M:%S %z'
>>> timegm(datetime.strptime(tm, fmt).utctimetuple())
3600

Note:

UNIX timestamp is a floating point number expressed in seconds since the epoch, in UTC.


Edit:

$ python3
>>> from datetime import datetime, timezone, timedelta
>>> from calendar import timegm
>>> dt = datetime(1970, 1, 1, 6, 0)
>>> tz = timezone(timedelta(hours=5))
>>> timegm(dt.replace(tzinfo=tz).utctimetuple())
3600

How to get access to job parameters from ItemReader, in Spring Batch?

If you want to define your ItemReader instance and your Step instance in a single JavaConfig class. You can use the @StepScope and the @Value annotations such as:

@Configuration
public class ContributionCardBatchConfiguration {

   private static final String WILL_BE_INJECTED = null;

   @Bean
   @StepScope
   public FlatFileItemReader<ContributionCard> contributionCardReader(@Value("#{jobParameters['fileName']}")String contributionCardCsvFileName){

     ....
   }

   @Bean
   Step ingestContributionCardStep(ItemReader<ContributionCard> reader){
         return stepBuilderFactory.get("ingestContributionCardStep")
                 .<ContributionCard, ContributionCard>chunk(1)
                 .reader(contributionCardReader(WILL_BE_INJECTED))
                 .writer(contributionCardWriter())
                 .build();
    }
}

The trick is to pass a null value to the itemReader since it will be injected through the @Value("#{jobParameters['fileName']}") annotation.

Thanks to Tobias Flohre for his article : Spring Batch 2.2 – JavaConfig Part 2: JobParameters, ExecutionContext and StepScope

C++ Redefinition Header Files (winsock2.h)

#pragma once is flakey, even on MS compilers, and is not supported by many other compilers. As many other people have mentioned, using include guards is the way to go. Don't use #pragma once at all - it'll make your life much easier.

How can I draw vertical text with CSS cross-browser?

I adapted this from http://snook.ca/archives/html_and_css/css-text-rotation :

<style>
    .Rotate-90
    {
        display: block;
        position: absolute;
        right: -5px;
        top: 15px;
        -webkit-transform: rotate(-90deg);
        -moz-transform: rotate(-90deg);
    }
</style>
<!--[if IE]>
    <style>
        .Rotate-90 {
            filter: progid:DXImageTransform.Microsoft.BasicImage(rotation=3);
            right:-15px; top:5px;
        }
    </style>
    <![endif]-->

Array of char* should end at '\0' or "\0"?

Null termination is a bad design pattern best left in the history books. There's still plenty of inertia behind c-strings, so it can't be avoided there. But there's no reason to use it in the OP's example.

Don't use any terminator, and use sizeof(array) / sizeof(array[0]) to get the number of elements.

How to set the value for Radio Buttons When edit?

For those who might be in need for a solution in pug template engine and NodeJs back-end, you can use this:

If values are not boolean(IE: true or false), code below works fine:

input(type='radio' name='sex' value='male' checked=(dbResult.sex ==='male') || (dbResult.sex === 'newvalue') )
input(type='radio' name='sex' value='female' checked=(dbResult.sex ==='female) || (dbResult.sex === 'newvalue'))

If values are boolean(ie: true or false), use this instead:

input(type='radio' name='isInsurable' value='true' checked=singleModel.isInsurable || (singleModel.isInsurable === 'true') )
input(type='radio' name='isInsurable' value='false' checked=!singleModel.isInsurable || (singleModel.isInsurable === 'false'))

the reason for this || operator is to re-display new values if editing fails due to validation error and you have a logic to send back the new values to your front-end

Create 3D array using Python

You should use a list comprehension:

>>> import pprint
>>> n = 3
>>> distance = [[[0 for k in xrange(n)] for j in xrange(n)] for i in xrange(n)]
>>> pprint.pprint(distance)
[[[0, 0, 0], [0, 0, 0], [0, 0, 0]],
 [[0, 0, 0], [0, 0, 0], [0, 0, 0]],
 [[0, 0, 0], [0, 0, 0], [0, 0, 0]]]
>>> distance[0][1]
[0, 0, 0]
>>> distance[0][1][2]
0

You could have produced a data structure with a statement that looked like the one you tried, but it would have had side effects since the inner lists are copy-by-reference:

>>> distance=[[[0]*n]*n]*n
>>> pprint.pprint(distance)
[[[0, 0, 0], [0, 0, 0], [0, 0, 0]],
 [[0, 0, 0], [0, 0, 0], [0, 0, 0]],
 [[0, 0, 0], [0, 0, 0], [0, 0, 0]]]
>>> distance[0][0][0] = 1
>>> pprint.pprint(distance)
[[[1, 0, 0], [1, 0, 0], [1, 0, 0]],
 [[1, 0, 0], [1, 0, 0], [1, 0, 0]],
 [[1, 0, 0], [1, 0, 0], [1, 0, 0]]]

How to get ID of button user just clicked?

With pure javascript:

var buttons = document.getElementsByTagName("button");
var buttonsCount = buttons.length;
for (var i = 0; i <= buttonsCount; i += 1) {
    buttons[i].onclick = function(e) {
        alert(this.id);
    };
}?

http://jsfiddle.net/TKKBV/2/

Align nav-items to right side in bootstrap-4

In my case, I was looking for a solution that allows one of the navbar items to be right aligned. In order to do this, you must add style="width:100%;" to the <ul class="navbar-nav"> and then add the ml-auto class to your navbar item.

Interpreting "condition has length > 1" warning from `if` function

Use lapply function after creating your function normally.

lapply(x="your input", fun="insert your function name")

lapply gives a list so use unlist function to take them out of the function

unlist(lapply(a,w))

MySQL - Using COUNT(*) in the WHERE clause

COUNT(*) can only be used with HAVING and must be used after GROUP BY statement Please find the following example:

SELECT COUNT(*), M_Director.PID FROM Movie
INNER JOIN M_Director ON Movie.MID = M_Director.MID 
GROUP BY M_Director.PID
HAVING COUNT(*) > 10
ORDER BY COUNT(*) ASC

How to use cURL to send Cookies?

curl -H @<header_file> <host>

Since curl 7.55 headers from file are supported with @<file>

echo 'Cookie: USER_TOKEN=Yes' > /tmp/cookie

curl -H @/tmp/cookie <host>

docs & commit

SSIS Convert Between Unicode and Non-Unicode Error

Below Steps worked for me:

1). right click on source task.

2). click on "Show Advanced editor". advanced edit option for source task in ssis

3). Go to "Input and Output Properties" tab.

4). select the output column for which you are getting the error.

5). Its data type will be "String[DT_STR]".

6). Change that data type to "Unicode String[DT_WSTR]". Changing the data type to unicode string

7). save and close. Hope this helps!

Android WebView not loading an HTTPS URL

To handle SSL urls the method onReceivedSslError() from the WebViewClient class, This is an example:

 webview.setWebViewClient(new WebViewClient() {
              ...
              ...
              ...

            @Override
            public void onReceivedSslError(WebView view, final SslErrorHandler handler, SslError error) {
                String message = "SSL Certificate error.";
                switch (error.getPrimaryError()) {
                    case SslError.SSL_UNTRUSTED:
                        message = "The certificate authority is not trusted.";
                        break;
                    case SslError.SSL_EXPIRED:
                        message = "The certificate has expired.";
                        break;
                    case SslError.SSL_IDMISMATCH:
                        message = "The certificate Hostname mismatch.";
                        break;
                    case SslError.SSL_NOTYETVALID:
                        message = "The certificate is not yet valid.";
                        break;
                }
                message += "\"SSL Certificate Error\" Do you want to continue anyway?.. YES";

                handler.proceed();
            }

        });

You can check my complete example here: https://github.com/Jorgesys/Android-WebView-Logging

enter image description here

Getting the difference between two sets

You can use CollectionUtils.disjunction to get all differences or CollectionUtils.subtract to get the difference in the first collection.

Here is an example of how to do that:

    var collection1 = List.of(1, 2, 3, 4, 5);
    var collection2 = List.of(2, 3, 5, 6);
    System.out.println(StringUtils.join(collection1, " , "));
    System.out.println(StringUtils.join(collection2, " , "));
    System.out.println(StringUtils.join(CollectionUtils.subtract(collection1, collection2), " , "));
    System.out.println(StringUtils.join(CollectionUtils.retainAll(collection1, collection2), " , "));
    System.out.println(StringUtils.join(CollectionUtils.collate(collection1, collection2), " , "));
    System.out.println(StringUtils.join(CollectionUtils.disjunction(collection1, collection2), " , "));
    System.out.println(StringUtils.join(CollectionUtils.intersection(collection1, collection2), " , "));
    System.out.println(StringUtils.join(CollectionUtils.union(collection1, collection2), " , "));

@Scope("prototype") bean scope not creating new bean

By default, Spring beans are singletons. The problem arises when we try to wire beans of different scopes. For example, a prototype bean into a singleton. This is known as the scoped bean injection problem.

Another way to solve the problem is method injection with the @Lookup annotation.

Here is a nice article on this issue of injecting prototype beans into a singleton instance with multiple solutions.

https://www.baeldung.com/spring-inject-prototype-bean-into-singleton

Start/Stop and Restart Jenkins service on Windows

To start Jenkins from command line

  1. Open command prompt
  2. Go to the directory where your war file is placed and run the following command:

    java -jar jenkins.war

To stop

Ctrl + C

CFNetwork SSLHandshake failed iOS 9

iOS 9 and OSX 10.11 require TLSv1.2 SSL for all hosts you plan to request data from unless you specify exception domains in your app's Info.plist file.

The syntax for the Info.plist configuration looks like this:

<key>NSAppTransportSecurity</key>
<dict>
  <key>NSExceptionDomains</key>
  <dict>
    <key>yourserver.com</key>
    <dict>
      <!--Include to allow subdomains-->
      <key>NSIncludesSubdomains</key>
      <true/>
      <!--Include to allow insecure HTTP requests-->
      <key>NSExceptionAllowsInsecureHTTPLoads</key>
      <true/>
      <!--Include to specify minimum TLS version-->
      <key>NSExceptionMinimumTLSVersion</key>
      <string>TLSv1.1</string>
    </dict>
  </dict>
</dict>

If your application (a third-party web browser, for instance) needs to connect to arbitrary hosts, you can configure it like this:

<key>NSAppTransportSecurity</key>
<dict>
    <!--Connect to anything (this is probably BAD)-->
    <key>NSAllowsArbitraryLoads</key>
    <true/>
</dict>

If you're having to do this, it's probably best to update your servers to use TLSv1.2 and SSL, if they're not already doing so. This should be considered a temporary workaround.

As of today, the prerelease documentation makes no mention of any of these configuration options in any specific way. Once it does, I'll update the answer to link to the relevant documentation.

phpMyAdmin says no privilege to create database, despite logged in as root user

It appears to be a transient issue and fixed itself afterwards. Thanks for everyone's attention.

Hibernate throws org.hibernate.AnnotationException: No identifier specified for entity: com..domain.idea.MAE_MFEView

Using @EmbeddableId for the PK entity has solved my issue.

@Entity
@Table(name="SAMPLE")
 public class SampleEntity implements Serializable{
   private static final long serialVersionUID = 1L;

   @EmbeddedId
   SampleEntityPK id;

 }

Comparing Arrays of Objects in JavaScript

There is a optimized code for case when function needs to equals to empty arrays (and returning false in that case)

const objectsEqual = (o1, o2) => {
    if (o2 === null && o1 !== null) return false;
    return o1 !== null && typeof o1 === 'object' && Object.keys(o1).length > 0 ?
        Object.keys(o1).length === Object.keys(o2).length && 
        Object.keys(o1).every(p => objectsEqual(o1[p], o2[p]))
        : (o1 !== null && Array.isArray(o1) && Array.isArray(o2) && !o1.length && 
        !o2.length) ? true : o1 === o2;
}

Configure Nginx with proxy_pass

Give this a try...

server {
    listen   80;
    server_name  dev.int.com;
    access_log off;
    location / {
        proxy_pass http://IP:8080;
        proxy_set_header    Host            $host;
        proxy_set_header    X-Real-IP       $remote_addr;
        proxy_set_header    X-Forwarded-for $remote_addr;
        port_in_redirect off;
        proxy_redirect   http://IP:8080/jira  /;
        proxy_connect_timeout 300;
    }

    location ~ ^/stash {
        proxy_pass http://IP:7990;
        proxy_set_header    Host            $host;
        proxy_set_header    X-Real-IP       $remote_addr;
        proxy_set_header    X-Forwarded-for $remote_addr;
        port_in_redirect off;
        proxy_redirect   http://IP:7990/  /stash;
        proxy_connect_timeout 300;
    }

    error_page   500 502 503 504  /50x.html;
    location = /50x.html {
        root   /usr/local/nginx/html;
    }
}

How do you create a Distinct query in HQL

Suppose you have a Customer Entity mapped to CUSTOMER_INFORMATION table and you want to get list of distinct firstName of customer. You can use below snippet to get the same.

Query distinctFirstName = session.createQuery("select ci.firstName from Customer ci group by ci.firstName");
Object [] firstNamesRows = distinctFirstName.list();

I hope it helps. So here we are using group by instead of using distinct keyword.

Also previously I found it difficult to use distinct keyword when I want to apply it to multiple columns. For example I want of get list of distinct firstName, lastName then group by would simply work. I had difficulty in using distinct in this case.

How do I print out the contents of an object in Rails for easy debugging?

In Rails you can print the result in the View by using the debug' Helper ActionView::Helpers::DebugHelper

#app/view/controllers/post_controller.rb
def index
 @posts = Post.all
end

#app/view/posts/index.html.erb
<%= debug(@posts) %>

#start your server
rails -s

results (in browser)

- !ruby/object:Post
  raw_attributes:
    id: 2
    title: My Second Post
    body: Welcome!  This is another example post
    published_at: '2015-10-19 23:00:43.469520'
    created_at: '2015-10-20 00:00:43.470739'
    updated_at: '2015-10-20 00:00:43.470739'
  attributes: !ruby/object:ActiveRecord::AttributeSet
    attributes: !ruby/object:ActiveRecord::LazyAttributeHash
      types: &5
        id: &2 !ruby/object:ActiveRecord::Type::Integer
          precision: 
          scale: 
          limit: 
          range: !ruby/range
            begin: -2147483648
            end: 2147483648
            excl: true
        title: &3 !ruby/object:ActiveRecord::Type::String
          precision: 
          scale: 
          limit: 
        body: &4 !ruby/object:ActiveRecord::Type::Text
          precision: 
          scale: 
          limit: 
        published_at: !ruby/object:ActiveRecord::AttributeMethods::TimeZoneConversion::TimeZoneConverter
          subtype: &1 !ruby/object:ActiveRecord::Type::DateTime
            precision: 
            scale: 
            limit: 
        created_at: !ruby/object:ActiveRecord::AttributeMethods::TimeZoneConversion::TimeZoneConverter
          subtype: *1
        updated_at: !ruby/object:ActiveRecord::AttributeMethods::TimeZoneConversion::TimeZoneConverter
          subtype: *1

How to fix '.' is not an internal or external command error

Just leave out the "dot-slash" ./:

D:\Gesture Recognition\Gesture Recognition\Debug>"Gesture Recognition.exe"

Though, if you wanted to, you could use .\ and it would work.

D:\Gesture Recognition\Gesture Recognition\Debug>.\"Gesture Recognition.exe"

What is Python buffer type for?

An example usage:

>>> s = 'Hello world'
>>> t = buffer(s, 6, 5)
>>> t
<read-only buffer for 0x10064a4b0, size 5, offset 6 at 0x100634ab0>
>>> print t
world

The buffer in this case is a sub-string, starting at position 6 with length 5, and it doesn't take extra storage space - it references a slice of the string.

This isn't very useful for short strings like this, but it can be necessary when using large amounts of data. This example uses a mutable bytearray:

>>> s = bytearray(1000000)   # a million zeroed bytes
>>> t = buffer(s, 1)         # slice cuts off the first byte
>>> s[1] = 5                 # set the second element in s
>>> t[0]                     # which is now also the first element in t!
'\x05'

This can be very helpful if you want to have more than one view on the data and don't want to (or can't) hold multiple copies in memory.

Note that buffer has been replaced by the better named memoryview in Python 3, though you can use either in Python 2.7.

Note also that you can't implement a buffer interface for your own objects without delving into the C API, i.e. you can't do it in pure Python.

ImportError: No module named 'pygame'

I ran into the error a few days ago! Thankfully, I found the answer.

You see, the problem is that pygame comes in a .whl (wheel) file/package. So, as a result, you have to pip install it.

Pip installing is a very tricky process, so please be careful. The steps are:-

Step1. Go to C:/Python (whatever version you are using)/Scripts. Scroll down. If you see a file named pip.exe, then that means that you are in the right folder. Copy the path.

Step2. In your computer, search for Environment Variables. You should see an option labeled 'Edit the System Environment Variables'. Click on it.

Step3. There, you should see a dialogue box appear. Click 'Environment Variables'. Click on 'Path'. Then, click 'New'. Paste the path that you copies earlier.

Step4. Click 'Ok'.

Step5. Shift + Right Click wherever your pygame is installed. Select 'Open Command Window Here' from the dropdown menu. Type in 'pip install py' then click tab and the full file name should fill in. Then, press Enter, and you're ready to go! Now you shouldn't get the error again!!!

Is there any kind of hash code function in JavaScript?

The JavaScript specification defines indexed property access as performing a toString conversion on the index name. For example,

myObject[myProperty] = ...;

is the same as

myObject[myProperty.toString()] = ...;

This is necessary as in JavaScript

myObject["someProperty"]

is the same as

myObject.someProperty

And yes, it makes me sad as well :-(

ssh "permissions are too open" error

for Win10 need move your key to user's home dir for linuxlike os you need to chmod to 700 like or 600 etc.

HTML-Tooltip position relative to mouse pointer

For default tooltip behavior simply add the title attribute. This can't contain images though.

<div title="regular tooltip">Hover me</div>

Before you clarified the question I did this up in pure JavaScript, hope you find it useful. The image will pop up and follow the mouse.

jsFiddle

JavaScript

var tooltipSpan = document.getElementById('tooltip-span');

window.onmousemove = function (e) {
    var x = e.clientX,
        y = e.clientY;
    tooltipSpan.style.top = (y + 20) + 'px';
    tooltipSpan.style.left = (x + 20) + 'px';
};

CSS

.tooltip span {
    display:none;
}
.tooltip:hover span {
    display:block;
    position:fixed;
    overflow:hidden;
}

Extending for multiple elements

One solution for multiple elements is to update all tooltip span's and setting them under the cursor on mouse move.

jsFiddle

var tooltips = document.querySelectorAll('.tooltip span');

window.onmousemove = function (e) {
    var x = (e.clientX + 20) + 'px',
        y = (e.clientY + 20) + 'px';
    for (var i = 0; i < tooltips.length; i++) {
        tooltips[i].style.top = y;
        tooltips[i].style.left = x;
    }
};

What is the right way to debug in iPython notebook?

Use ipdb

Install it via

pip install ipdb

Usage:

In[1]: def fun1(a):
   def fun2(a):
       import ipdb; ipdb.set_trace() # debugging starts here
       return do_some_thing_about(b)
   return fun2(a)
In[2]: fun1(1)

For executing line by line use n and for step into a function use s and to exit from debugging prompt use c.

For complete list of available commands: https://appletree.or.kr/quick_reference_cards/Python/Python%20Debugger%20Cheatsheet.pdf

Format of the initialization string does not conform to specification starting at index 0

I had the same problem spent an entire day. The error indicates Connection string issue for sure as index 0 is connection string. My issue was in the Startup class. I used:

var connection = Configuration["ConnectionStrings:DefaultConnection"];
services.AddControllersWithViews();
services.AddApplicationInsightsTelemetry();
services.AddDbContextPool<Models.PicTickContext>(options => options.UseSqlServer("connection"));`

which is wrong instead use this:

services.AddControllersWithViews();
services.AddApplicationInsightsTelemetry();
services.AddDbContextPool<Models.PicTickContext>(options => options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));

and my problem was solved.

Declare a Range relative to the Active Cell with VBA

Like this:

Dim rng as Range
Set rng = ActiveCell.Resize(numRows, numCols)

then read the contents of that range to an array:

Dim arr As Variant
arr = rng.Value
'arr is now a two-dimensional array of size (numRows, numCols)

or, select the range (I don't think that's what you really want, but you ask for this in the question).

rng.Select

jQuery UI DatePicker to show year only

  $(function() {
    $('#datepicker1').datepicker( {
        changeMonth: true,
        changeYear: true,
        showButtonPanel: true,
        dateFormat: 'MM yy',
        onClose: function(dateText, inst) { 
            var month = $("#ui-datepicker-div .ui-datepicker-month :selected").val();
            var year = $("#ui-datepicker-div .ui-datepicker-year :selected").val();
            $(this).datepicker('setDate', new Date(year, month, 1));
        }
    });
});?

Style should be

.ui-datepicker-calendar {
    display: none;
    }?

working demo

Plot width settings in ipython notebook

If you use %pylab inline you can (on a new line) insert the following command:

%pylab inline
pylab.rcParams['figure.figsize'] = (10, 6)

This will set all figures in your document (unless otherwise specified) to be of the size (10, 6), where the first entry is the width and the second is the height.

See this SO post for more details. https://stackoverflow.com/a/17231361/1419668

CodeIgniter activerecord, retrieve last insert id?

$this->db->insert_id()  

//please try this

How does spring.jpa.hibernate.ddl-auto property exactly work in Spring?

For the record, the spring.jpa.hibernate.ddl-auto property is Spring Data JPA specific and is their way to specify a value that will eventually be passed to Hibernate under the property it knows, hibernate.hbm2ddl.auto.

The values create, create-drop, validate, and update basically influence how the schema tool management will manipulate the database schema at startup.

For example, the update operation will query the JDBC driver's API to get the database metadata and then Hibernate compares the object model it creates based on reading your annotated classes or HBM XML mappings and will attempt to adjust the schema on-the-fly.

The update operation for example will attempt to add new columns, constraints, etc but will never remove a column or constraint that may have existed previously but no longer does as part of the object model from a prior run.

Typically in test case scenarios, you'll likely use create-drop so that you create your schema, your test case adds some mock data, you run your tests, and then during the test case cleanup, the schema objects are dropped, leaving an empty database.

In development, it's often common to see developers use update to automatically modify the schema to add new additions upon restart. But again understand, this does not remove a column or constraint that may exist from previous executions that is no longer necessary.

In production, it's often highly recommended you use none or simply don't specify this property. That is because it's common practice for DBAs to review migration scripts for database changes, particularly if your database is shared across multiple services and applications.

How to replace sql field value

You could just use REPLACE:

UPDATE myTable SET emailCol = REPLACE(emailCol, '.com', '.org')`.

But take into account an email address such as [email protected] will be updated to [email protected].

If you want to be on a safer side, you should check for the last 4 characters using RIGHT, and append .org to the SUBSTRING manually instead. Notice the usage of UPPER to make the search for the .com ending case insensitive.

UPDATE myTable 
SET emailCol = SUBSTRING(emailCol, 1, LEN(emailCol)-4) + '.org'
WHERE UPPER(RIGHT(emailCol,4)) = '.COM';

See it working in this SQLFiddle.

Insert data into a view (SQL Server)

You have created a table with ID as PRIMARY KEY, which satisfies UNIQUE and NOT NULL constraints, so you can't make the ID as NULL by inserting name field, so ID should also be inserted.

The error message indicates this.

How to work with string fields in a C struct?

This does not work:

string s = (string)malloc(sizeof string); 

string refers to a pointer, you need the size of the structure itself:

string s = malloc(sizeof (*string)); 

Note the lack of cast as well (conversion from void* (malloc's return type) is implicitly performed).

Also, in your main, you have a globally delcared patient, but that is uninitialized. Try:

 patient.number = 3;     
 patient.name = "John";     
 patient.address = "Baker street";     
 patient.birthdate = "4/15/2012";     
 patient.gender = 'M';     

before you read-access any of its members

Also, strcpy is inherently unsafe as it does not have boundary checking (will copy until the first '\0' is encountered, writing past allocated memory if the source is too long). Use strncpy instead, where you can at least specify the maximum number of characters copied -- read the documentation to ensure you pass the correct value, it is easy to make an off-by-one error.

MySQL SELECT AS combine two columns into one

In case of NULL columns it is better to use IF clause like this which combine the two functions of : CONCAT and COALESCE and uses special chars between the columns in result like space or '_'

SELECT FirstName , LastName , 
IF(FirstName IS NULL AND LastName IS NULL, NULL,' _ ',CONCAT(COALESCE(FirstName ,''), COALESCE(LastName ,''))) 
AS Contact_Phone FROM   TABLE1

Including jars in classpath on commandline (javac or apt)

Note for Windows users, the jars should be separated by ; and not :.

for example: javac -cp external_libs\lib1.jar;other\lib2.jar;

Get docker container id from container name

The simplest way I can think of is to parse the output of docker ps

Let's run the latest ubuntu image interactively and connect to it

docker run -it ubuntu /bin/bash

If you run docker ps in another terminal you can see something like

CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
8fddbcbb101c        ubuntu:latest       "/bin/bash"         10 minutes ago      Up 10 minutes                           gloomy_pasteur

Unfortunately, parsing this format isn't easy since they uses spaces to manually align stuff

$ sudo docker ps | sed -e 's/ /@/g'
CONTAINER@ID@@@@@@@@IMAGE@@@@@@@@@@@@@@@COMMAND@@@@@@@@@@@@@CREATED@@@@@@@@@@@@@STATUS@@@@@@@@@@@@@@PORTS@@@@@@@@@@@@@@@NAMES
8fddbcbb101c@@@@@@@@ubuntu:latest@@@@@@@"/bin/bash"@@@@@@@@@13@minutes@ago@@@@@@Up@13@minutes@@@@@@@@@@@@@@@@@@@@@@@@@@@gloomy_pasteur@@@@@@

Here is a script that converts the output to JSON.

https://gist.github.com/mminer/a08566f13ef687c17b39

Actually, the output is a bit more convenient to work with than that. Every field is 20 characters wide. [['CONTAINER ID',0],['IMAGE',20],['COMMAND',40],['CREATED',60],['STATUS',80],['PORTS',100],['NAMES',120]]

JSON parse error: Can not construct instance of java.time.LocalDate: no String-argument constructor/factory method to deserialize from String value

Spring Boot 2.2.2 / Gradle:

Gradle (build.gradle):

implementation("com.fasterxml.jackson.datatype:jackson-datatype-jsr310")

Entity (User.class):

LocalDate dateOfBirth;

Code:

ObjectMapper mapper = new ObjectMapper();
mapper.registerModule(new JavaTimeModule());
User user = mapper.readValue(json, User.class);

Connect Bluestacks to Android Studio

  1. Goto Blustacks settings > Preferences > Check Enable Android Debug Bridge (ADB)
  2. Restart Bluestacks and Start Android Studio
  3. Done

SQL Server after update trigger

CREATE TRIGGER [dbo].[after_update] ON [dbo].[MYTABLE]
AFTER UPDATE
AS
BEGIN
    DECLARE @ID INT

    SELECT @ID = D.ID
    FROM inserted D

    UPDATE MYTABLE
    SET mytable.CHANGED_ON = GETDATE()
        ,CHANGED_BY = USER_NAME(USER_ID())
    WHERE ID = @ID
END

getting exception "IllegalStateException: Can not perform this action after onSaveInstanceState"

I think Lifecycle state can help to prevent such crash starting from Android support lib v26.1.0 you can have the following check:

if (getLifecycle().getCurrentState().isAtLeast(Lifecycle.State.STARTED)){
  // Do fragment's transaction commit
}

or you can try:

Fragment.isStateSaved()

more information here https://developer.android.com/reference/android/support/v4/app/Fragment.html#isStateSaved()

How to use the PI constant in C++

Standard C++ doesn't have a constant for PI.

Many C++ compilers define M_PI in cmath (or in math.h for C) as a non-standard extension. You may have to #define _USE_MATH_DEFINES before you can see it.

Multiple ping script in Python

import subprocess,os,threading,time
from queue import Queue
lock=threading.Lock()
_start=time.time()
def check(n):
    with open(os.devnull, "wb") as limbo:
                ip="192.168.21.{0}".format(n)
                result=subprocess.Popen(["ping", "-n", "1", "-w", "300", ip],stdout=limbo, stderr=limbo).wait()
                with lock:                    
                    if not result:
                        print (ip, "active")                    
                    else:
                        pass                        

def threader():
    while True:
        worker=q.get()
        check(worker)
        q.task_done()
q=Queue()

for x in range(255):
    t=threading.Thread(target=threader)
    t.daemon=True
    t.start()
for worker in range(1,255):
    q.put(worker)
q.join()
print("Process completed in: ",time.time()-_start)

I think this will be better one.

Browser detection in JavaScript?

navigator.sayswho= (function(){
    var ua= navigator.userAgent, tem,
    M= ua.match(/(opera|chrome|safari|firefox|msie|trident(?=\/))\/?\s*(\d+)/i) || [];
    if(/trident/i.test(M[1])){
        tem=  /\brv[ :]+(\d+)/g.exec(ua) || [];
        return 'IE '+(tem[1] || '');
    }
    if(M[1]=== 'Chrome'){
        tem= ua.match(/\b(OPR|Edge?)\/(\d+)/);
        if(tem!= null) return tem.slice(1).join(' ').replace('OPR', 'Opera').replace('Edg ', 'Edge ');            
    }
    M= M[2]? [M[1], M[2]]: [navigator.appName, navigator.appVersion, '-?'];
    if((tem= ua.match(/version\/(\d+)/i))!= null) M.splice(1, 1, tem[1]);
    return M.join(' ');
})();

As the name implies, this will tell you the name and version number supplied by the browser.

It is handy for sorting test and error results, when you are testing new code on multiple browsers.

How would one write object-oriented code in C?

I built a little library where I tried that and to me it works real nicely. So I thought I share the experience.

https://github.com/thomasfuhringer/oxygen

Single inheritance can be implemented quite easily using a struct and extending it for every other child class. A simple cast to the parent structure makes it possible to use parent methods on all the descendants. As long as you know that a variable points to a struct holding this kind of an object you can always cast to the root class and do introspection.

As has been mentioned, virtual methods are somewhat trickier. But they are doable. To keep things simple I just use an array of functions in the class description structure which every child class copies and repopulates individual slots where required.

Multiple inheritance would be rather complicated to implement and comes with a significant performance impact. So I leave it. I do consider it desirable and useful in quite a few cases to cleanly model real life circumstances, but in probably 90% of cases single inheritance covers the needs. And single inheritance is simple and costs nothing.

Also I do not care about type safety. I think you should not depend on the compiler to prevent you from programming mistakes. And it shields you only from a rather small part of errors anyway.

Typically, in an object oriented environment you also want to implement reference counting to automate memory management to the extent possible. So I also put a reference count into the “Object” root class and some functionality to encapsulate allocation and deallocation of heap memory.

It is all very simple and lean and gives me the essentials of OO without forcing me to deal with the monster that is C++. And I retain the flexibility of staying in C land, which among other things makes it easier to integrate third party libraries.

Can't access to HttpContext.Current

Have you included the System.Web assembly in the application?

using System.Web;

If not, try specifying the System.Web namespace, for example:

 System.Web.HttpContext.Current

Why does git perform fast-forward merges by default?

Fast-forward merging makes sense for short-lived branches, but in a more complex history, non-fast-forward merging may make the history easier to understand, and make it easier to revert a group of commits.

Warning: Non-fast-forwarding has potential side effects as well. Please review https://sandofsky.com/blog/git-workflow.html, avoid the 'no-ff' with its "checkpoint commits" that break bisect or blame, and carefully consider whether it should be your default approach for master.

alt text
(From nvie.com, Vincent Driessen, post "A successful Git branching model")

Incorporating a finished feature on develop

Finished features may be merged into the develop branch to add them to the upcoming release:

$ git checkout develop
Switched to branch 'develop'
$ git merge --no-ff myfeature
Updating ea1b82a..05e9557
(Summary of changes)
$ git branch -d myfeature
Deleted branch myfeature (was 05e9557).
$ git push origin develop

The --no-ff flag causes the merge to always create a new commit object, even if the merge could be performed with a fast-forward. This avoids losing information about the historical existence of a feature branch and groups together all commits that together added the feature.

Jakub Narebski also mentions the config merge.ff:

By default, Git does not create an extra merge commit when merging a commit that is a descendant of the current commit. Instead, the tip of the current branch is fast-forwarded.
When set to false, this variable tells Git to create an extra merge commit in such a case (equivalent to giving the --no-ff option from the command line).
When set to 'only', only such fast-forward merges are allowed (equivalent to giving the --ff-only option from the command line).


The fast-forward is the default because:

  • short-lived branches are very easy to create and use in Git
  • short-lived branches often isolate many commits that can be reorganized freely within that branch
  • those commits are actually part of the main branch: once reorganized, the main branch is fast-forwarded to include them.

But if you anticipate an iterative workflow on one topic/feature branch (i.e., I merge, then I go back to this feature branch and add some more commits), then it is useful to include only the merge in the main branch, rather than all the intermediate commits of the feature branch.

In this case, you can end up setting this kind of config file:

[branch "master"]
# This is the list of cmdline options that should be added to git-merge 
# when I merge commits into the master branch.

# The option --no-commit instructs git not to commit the merge
# by default. This allows me to do some final adjustment to the commit log
# message before it gets commited. I often use this to add extra info to
# the merge message or rewrite my local branch names in the commit message
# to branch names that are more understandable to the casual reader of the git log.

# Option --no-ff instructs git to always record a merge commit, even if
# the branch being merged into can be fast-forwarded. This is often the
# case when you create a short-lived topic branch which tracks master, do
# some changes on the topic branch and then merge the changes into the
# master which remained unchanged while you were doing your work on the
# topic branch. In this case the master branch can be fast-forwarded (that
# is the tip of the master branch can be updated to point to the tip of
# the topic branch) and this is what git does by default. With --no-ff
# option set, git creates a real merge commit which records the fact that
# another branch was merged. I find this easier to understand and read in
# the log.

mergeoptions = --no-commit --no-ff

The OP adds in the comments:

I see some sense in fast-forward for [short-lived] branches, but making it the default action means that git assumes you... often have [short-lived] branches. Reasonable?

Jefromi answers:

I think the lifetime of branches varies greatly from user to user. Among experienced users, though, there's probably a tendency to have far more short-lived branches.

To me, a short-lived branch is one that I create in order to make a certain operation easier (rebasing, likely, or quick patching and testing), and then immediately delete once I'm done.
That means it likely should be absorbed into the topic branch it forked from, and the topic branch will be merged as one branch. No one needs to know what I did internally in order to create the series of commits implementing that given feature.

More generally, I add:

it really depends on your development workflow:

  • if it is linear, one branch makes sense.
  • If you need to isolate features and work on them for a long period of time and repeatedly merge them, several branches make sense.

See "When should you branch?"

Actually, when you consider the Mercurial branch model, it is at its core one branch per repository (even though you can create anonymous heads, bookmarks and even named branches)
See "Git and Mercurial - Compare and Contrast".

Mercurial, by default, uses anonymous lightweight codelines, which in its terminology are called "heads".
Git uses lightweight named branches, with injective mapping to map names of branches in remote repository to names of remote-tracking branches.
Git "forces" you to name branches (well, with the exception of a single unnamed branch, which is a situation called a "detached HEAD"), but I think this works better with branch-heavy workflows such as topic branch workflow, meaning multiple branches in a single repository paradigm.

How to undo the last commit in git

Try simply to reset last commit using --soft flag

git reset --soft HEAD~1

Note :

For Windows, wrap the HEAD parts in quotes like git reset --soft "HEAD~1"

How to use Session attributes in Spring-mvc

Isn't it easiest and shortest that way? I knew it and just tested it - working perfect here:

@GetMapping
public String hello(HttpSession session) {
    session.setAttribute("name","value");
    return "hello";
}

p.s. I came here searching for an answer of "How to use Session attributes in Spring-mvc", but read so many without seeing the most obvious that I had written in my code. I didn't see it, so I thought its wrong, but no it was not. So lets share that knowledge with the easiest solution for the main question.

How to specify an alternate location for the .m2 folder or settings.xml permanently?

Below is the configuration in Maven software by default in MAVEN_HOME\conf\settings.xml.

<settings>
  <!-- localRepository
   | The path to the local repository maven will use to store artifacts.
   |
   | Default: ~/.m2/repository
  <localRepository>/path/to/local/repo</localRepository>
  -->

Add the below line under this configuration, will fulfill the requirement.

<localRepository>custom_path</localRepository>

Ex: <localRepository>D:/MYNAME/settings/.m2/repository</localRepository>

Why does intellisense and code suggestion stop working when Visual Studio is open?

For python, try clicking on the "Python X.X" button on the left side of the bottom status bar and changing it to different values.

This is the only thing that worked for me.

How to do case insensitive string comparison?

With the help of regular expression also we can achieve.

(/keyword/i).test(source)

/i is for ignore case. If not necessary we can ignore and test for NOT case sensitive match like

(/keyword/).test(source)

How to refresh page on back button click?

Ahem u_u

As i've stated the back button is for every one of us a pain in some place... that said...

As long as you load the page normally it makes a lot of trouble... for a standard "site" it will not change that much... however i think you can make something like this

The user access everytime to your page .php that choose what to load. You can try to work a little with cache (to not cache page) and maybe expire date.

But the long term solution will be put a code on "onload" event to fetch the data trought Ajax, this way you can (with Javascript) run the code you want, and example refresh the page.

Bigger Glyphicons

The .btn-lg class has the following CSS in Bootstrap 3 (link):

.btn-lg {
  padding: 10px 16px;
  font-size: 18px;
  line-height: 1.33;
  border-radius: 6px;
}

If you apply the same font-size and line-height to your span (either .glyphicon-link or a newly created .glyphicons-lg if you're going to use this effect in more than one instance), you'll get a Glyphicon the same size as the large button.

What is the maximum number of characters that nvarchar(MAX) will hold?

From char and varchar (Transact-SQL)

varchar [ ( n | max ) ]

Variable-length, non-Unicode character data. n can be a value from 1 through 8,000. max indicates that the maximum storage size is 2^31-1 bytes. The storage size is the actual length of data entered + 2 bytes. The data entered can be 0 characters in length. The ISO synonyms for varchar are char varying or character varying.

How to Populate a DataTable from a Stored Procedure

You don't need to add the columns manually. Just use a DataAdapter and it's simple as:

DataTable table = new DataTable();
using(var con = new SqlConnection(ConfigurationManager.ConnectionStrings["DB"].ConnectionString))
using(var cmd = new SqlCommand("usp_GetABCD", con))
using(var da = new SqlDataAdapter(cmd))
{
   cmd.CommandType = CommandType.StoredProcedure;
   da.Fill(table);
}

Note that you even don't need to open/close the connection. That will be done implicitly by the DataAdapter.

The connection object associated with the SELECT statement must be valid, but it does not need to be open. If the connection is closed before Fill is called, it is opened to retrieve data, then closed. If the connection is open before Fill is called, it remains open.

How to get a list of user accounts using the command line in MySQL?

Login to mysql as root and type following query

select User from mysql.user;

+------+
| User |
+------+
| amon |
| root |
| root |
+------+

Clearing <input type='file' /> using jQuery

For obvious security reasons you can't set the value of a file input, even to an empty string.

All you have to do is reset the form where the field or if you only want to reset the file input of a form containing other fields, use this:

function reset_field (e) {
    e.wrap('<form>').parent('form').trigger('reset');
    e.unwrap();
}?

Here is an exemple: http://jsfiddle.net/v2SZJ/1/

How to move/rename a file using an Ansible task on a remote system

From version 2.0, in copy module you can use remote_src parameter.

If True it will go to the remote/target machine for the src.

- name: Copy files from foo to bar
  copy: remote_src=True src=/path/to/foo dest=/path/to/bar

If you want to move file you need to delete old file with file module

- name: Remove old files foo
  file: path=/path/to/foo state=absent

From version 2.8 copy module remote_src supports recursive copying.

Dealing with "Xerces hell" in Java/Maven?

My friend that's very simple, here an example:

<dependency>
    <groupId>xalan</groupId>
    <artifactId>xalan</artifactId>
    <version>2.7.2</version>
    <scope>${my-scope}</scope>
    <exclusions>
        <exclusion>
        <groupId>xml-apis</groupId>
        <artifactId>xml-apis</artifactId>
    </exclusion>
</dependency>

And if you want to check in the terminal(windows console for this example) that your maven tree has no problems:

mvn dependency:tree -Dverbose | grep --color=always '(.* conflict\|^' | less -r

Check if value exists in dataTable?

DataRow rw = table.AsEnumerable().FirstOrDefault(tt => tt.Field<string>("Author") == "Name");
if (rw != null)
{
// row exists
}

add to your using clause :

using System.Linq;

and add :

System.Data.DataSetExtensions

to references.

String Resource new line /n not possible?

This is an old question, but I found that when you create a string like this:

<string name="newline_test">My
New line test</string>

The output in your app will be like this (no newline)

My New line test

When you put the string in quotation marks

<string name="newline_test">"My
New line test"</string>

the newline will appear:

My 
New line test

How to handle authentication popup with Selenium WebDriver using Java

I faced this issue a number of times in my application.

We can generally handle this with the below 2 approaches.

  1. Pass the username and password in url itself

  2. You can create an AutoIT Script and call script before opening the url.

Please check the below article in which I have mentioned both ways:
Handle Authentication/Login window in Selenium Webdriver

How can I add new array elements at the beginning of an array in Javascript?

array operations image

_x000D_
_x000D_
var a = [23, 45, 12, 67];_x000D_
a.unshift(34);_x000D_
console.log(a); // [34, 23, 45, 12, 67]
_x000D_
_x000D_
_x000D_

Table row and column number in jQuery

You can use the Core/index function in a given context, for example you can check the index of the TD in it's parent TR to get the column number, and you can check the TR index on the Table, to get the row number:

$('td').click(function(){
  var col = $(this).parent().children().index($(this));
  var row = $(this).parent().parent().children().index($(this).parent());
  alert('Row: ' + row + ', Column: ' + col);
});

Check a running example here.

Ordering issue with date values when creating pivot tables

I saw this somewhere else. I am using 2016 Excel. What worked for me was to use YYYY Quarters (I was looking for quarterly data). So, I had the source data sorted as YYYY xQ. 2016 1Q, 2016 2Q, 2016 3Q, 2016, 4Q, 2017 1Q, 2017 2Q... You get the idea.

Convert base64 png data to javascript file objects

Way 1: only works for dataURL, not for other types of url.

function dataURLtoFile(dataurl, filename) {
    var arr = dataurl.split(','), mime = arr[0].match(/:(.*?);/)[1],
        bstr = atob(arr[1]), n = bstr.length, u8arr = new Uint8Array(n);
    while(n--){
        u8arr[n] = bstr.charCodeAt(n);
    }
    return new File([u8arr], filename, {type:mime});
}

//Usage example:
var file = dataURLtoFile('data:image/png;base64,......', 'a.png');
console.log(file);

Way 2: works for any type of url, (http url, dataURL, blobURL, etc...)

//return a promise that resolves with a File instance
function urltoFile(url, filename, mimeType){
    mimeType = mimeType || (url.match(/^data:([^;]+);/)||'')[1];
    return (fetch(url)
        .then(function(res){return res.arrayBuffer();})
        .then(function(buf){return new File([buf], filename, {type:mimeType});})
    );
}

//Usage example:
urltoFile('data:image/png;base64,......', 'a.png')
.then(function(file){
    console.log(file);
})

Both works in Chrome and Firefox.

Scanner method to get a char

sc.next().charat(0).........is the method of entering character by user based on the number entered at the run time

example: sc.next().charat(2)------------>>>>>>>>

file_get_contents behind a proxy?

To use file_get_contents() over/through a proxy that doesn't require authentication, something like this should do :

(I'm not able to test this one : my proxy requires an authentication)

$aContext = array(
    'http' => array(
        'proxy'           => 'tcp://192.168.0.2:3128',
        'request_fulluri' => true,
    ),
);
$cxContext = stream_context_create($aContext);

$sFile = file_get_contents("http://www.google.com", False, $cxContext);

echo $sFile;

Of course, replacing the IP and port of my proxy by those which are OK for yours ;-)

If you're getting that kind of error :

Warning: file_get_contents(http://www.google.com) [function.file-get-contents]: failed to open stream: HTTP request failed! HTTP/1.0 407 Proxy Authentication Required

It means your proxy requires an authentication.

If the proxy requires an authentication, you'll have to add a couple of lines, like this :

$auth = base64_encode('LOGIN:PASSWORD');

$aContext = array(
    'http' => array(
        'proxy'           => 'tcp://192.168.0.2:3128',
        'request_fulluri' => true,
        'header'          => "Proxy-Authorization: Basic $auth",
    ),
);
$cxContext = stream_context_create($aContext);

$sFile = file_get_contents("http://www.google.com", False, $cxContext);

echo $sFile;

Same thing about IP and port, and, this time, also LOGIN and PASSWORD ;-) Check out all valid http options.

Now, you are passing an Proxy-Authorization header to the proxy, containing your login and password.

And... The page should be displayed ;-)

java get file size efficiently

The benchmark given by GHad measures lots of other stuff (such as reflection, instantiating objects, etc.) besides getting the length. If we try to get rid of these things then for one call I get the following times in microseconds:

   file sum___19.0, per Iteration___19.0
    raf sum___16.0, per Iteration___16.0
channel sum__273.0, per Iteration__273.0

For 100 runs and 10000 iterations I get:

   file sum__1767629.0, per Iteration__1.7676290000000001
    raf sum___881284.0, per Iteration__0.8812840000000001
channel sum___414286.0, per Iteration__0.414286

I did run the following modified code giving as an argument the name of a 100MB file.

import java.io.*;
import java.nio.channels.*;
import java.net.*;
import java.util.*;

public class FileSizeBench {

  private static File file;
  private static FileChannel channel;
  private static RandomAccessFile raf;

  public static void main(String[] args) throws Exception {
    int runs = 1;
    int iterations = 1;

    file = new File(args[0]);
    channel = new FileInputStream(args[0]).getChannel();
    raf = new RandomAccessFile(args[0], "r");

    HashMap<String, Double> times = new HashMap<String, Double>();
    times.put("file", 0.0);
    times.put("channel", 0.0);
    times.put("raf", 0.0);

    long start;
    for (int i = 0; i < runs; ++i) {
      long l = file.length();

      start = System.nanoTime();
      for (int j = 0; j < iterations; ++j)
        if (l != file.length()) throw new Exception();
      times.put("file", times.get("file") + System.nanoTime() - start);

      start = System.nanoTime();
      for (int j = 0; j < iterations; ++j)
        if (l != channel.size()) throw new Exception();
      times.put("channel", times.get("channel") + System.nanoTime() - start);

      start = System.nanoTime();
      for (int j = 0; j < iterations; ++j)
        if (l != raf.length()) throw new Exception();
      times.put("raf", times.get("raf") + System.nanoTime() - start);
    }
    for (Map.Entry<String, Double> entry : times.entrySet()) {
        System.out.println(
            entry.getKey() + " sum: " + 1e-3 * entry.getValue() +
            ", per Iteration: " + (1e-3 * entry.getValue() / runs / iterations));
    }
  }
}

Having both a Created and Last Updated timestamp columns in MySQL 4.0

This issue seemed to have been resolved in MySQL 5.6. I have noticed this until MySQL 5.5; here is an example code:

DROP TABLE IF EXISTS `provider_org_group` ;
CREATE TABLE IF NOT EXISTS `provider_org_group` (
  `id` INT NOT NULL,
  `name` VARCHAR(100) NOT NULL,
  `type` VARCHAR(100) NULL,
  `inserted` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `insert_src_ver_id` INT NULL,
  `updated` TIMESTAMP NULL ON UPDATE CURRENT_TIMESTAMP,
  `update_src_ver_id` INT NULL,
  `version` INT NULL,
  PRIMARY KEY (`id`),
  UNIQUE INDEX `id_UNIQUE` (`id` ASC),
  UNIQUE INDEX `name_UNIQUE` (`name` ASC))
ENGINE = InnoDB;

Running this on MySQL 5.5 gives:

ERROR 1293 (HY000): Incorrect table definition; there can be only one TIMESTAMP column with CURRENT_TIMESTAMP in DEFAULT or ON UPDATE clause

Running this on MySQL 5.6

0 row(s) affected   0.093 sec

Convert php array to Javascript

It can be done in a safer way.

If your PHP array contains special characters, you need to use rawurlencode() in PHP and then use decodeURIComponent() in JS to escape those. And parse the JSON to native js. Try this:

var data = JSON.parse(
        decodeURIComponent(
            "<?=rawurlencode(json_encode($data));?>"
        )
    );

console.log(data);

How do I set specific environment variables when debugging in Visual Studio?

If you can't use bat files to set up your environment, then your only likely option is to set up a system wide environment variable. You can find these by doing

  1. Right click "My Computer"
  2. Select properties
  3. Select the "advanced" tab
  4. Click the "environment variables" button
  5. In the "System variables" section, add the new environment variable that you desire
  6. "Ok" all the way out to accept your changes

I don't know if you'd have to restart visual studio, but seems unlikely. HTH

Encode URL in JavaScript?

The best answer is to use encodeURIComponent on values in the query string (and nowhere else).

However, I find that many APIs want to replace " " with "+" so I've had to use the following:

const value = encodeURIComponent(value).replace('%20','+');
const url = 'http://example.com?lang=en&key=' + value

escape is implemented differently in different browsers and encodeURI doesn't encode many characters (like # and even /) -- it's made to be used on a full URI/URL without breaking it – which isn't super helpful or secure.

And as @Jochem points out below, you may want to use encodeURIComponent() on a (each) folder name, but for whatever reason these APIs don't seem to want + in folder names so plain old encodeURIComponent works great.

Example:

const escapedValue = encodeURIComponent(value).replace('%20','+');
const escapedFolder = encodeURIComponent('My Folder'); // no replace
const url = `http://example.com/${escapedFolder}/?myKey=${escapedValue}`;

What is the best way to compare 2 folder trees on windows?

Did you try: https://www.araxis.com/merge/index.en It allows to visualize changes and selectively merge specific differences in files and folders.

What are the differences between "git commit" and "git push"?

Basically git commit "records changes to the repository" while git push "updates remote refs along with associated objects". So the first one is used in connection with your local repository, while the latter one is used to interact with a remote repository.

Here is a nice picture from Oliver Steele, that explains the git model and the commands:

Git data transport commands

Read more about git push and git pull on GitReady.com (the article I referred to first)

What’s the best way to check if a file exists in C++? (cross platform)

If your compiler supports C++17 you don't need boost, you can simply use std::filesystem::exists

#include <iostream> // only for std::cout
#include <filesystem>

if (!std::filesystem::exists("myfile.txt"))
{
    std::cout << "File not found!" << std::endl;
}

Highcharts - redraw() vs. new Highcharts.chart

var newData = [1,2,3,4,5,6,7];
var chart = $('#chartjs').highcharts();
chart.series[0].setData(newData, true);

Explanation:
Variable newData contains value that want to update in chart. Variable chart is an object of a chart. setData is a method provided by highchart to update data.

Method setData contains two parameters, in first parameter we need to pass new value as array and second param is Boolean value. If true then chart updates itself and if false then we have to use redraw() method to update chart (i.e chart.redraw();)

http://jsfiddle.net/NxEnH/8/

Simplest SOAP example

function SoapQuery(){
  var namespace = "http://tempuri.org/";
  var site = "http://server.com/Service.asmx";
  var xmlhttp = new ActiveXObject("Msxml2.ServerXMLHTTP.6.0");
  xmlhttp.setOption(2,  13056 );  /* if use standard proxy */
  var args,fname =  arguments.callee.caller.toString().match(/ ([^\(]+)/)[1]; /*??? ????????? ?-???*/
  try { args =   arguments.callee.caller.arguments.callee.toString().match(/\(([^\)]+)/)[1].split(",");  
    } catch (e) { args = Array();};
  xmlhttp.open('POST',site,true);  
  var i, ret = "", q = '<?xml version="1.0" encoding="utf-8"?>'+
   '<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">'+
   '<soap:Body><'+fname+ ' xmlns="'+namespace+'">';
  for (i=0;i<args.length;i++) q += "<" + args[i] + ">" + arguments.callee.caller.arguments[i] +  "</" + args[i] + ">";
  q +=   '</'+fname+'></soap:Body></soap:Envelope>';
            // Send the POST request
            xmlhttp.setRequestHeader("MessageType","CALL");
            xmlhttp.setRequestHeader("SOAPAction",namespace + fname);
            xmlhttp.setRequestHeader('Content-Type', 'text/xml');
            //WScript.Echo("?????? XML:" + q);
            xmlhttp.send(q);
     if  (xmlhttp.waitForResponse(5000)) ret = xmlhttp.responseText;
    return ret;
  };





function GetForm(prefix,post_vars){return SoapQuery();};
function SendOrder2(guid,order,fio,phone,mail){return SoapQuery();};

function SendOrder(guid,post_vars){return SoapQuery();};

Converting from signed char to unsigned char and back again?

I'm not 100% sure that I understand your question, so tell me if I'm wrong.

If I got it right, you are reading jbytes that are technically signed chars, but really pixel values ranging from 0 to 255, and you're wondering how you should handle them without corrupting the values in the process.

Then, you should do the following:

  • convert jbytes to unsigned char before doing anything else, this will definetly restore the pixel values you are trying to manipulate

  • use a larger signed integer type, such as int while doing intermediate calculations, this to make sure that over- and underflows can be detected and dealt with (in particular, not casting to a signed type could force to compiler to promote every type to an unsigned type in which case you wouldn't be able to detect underflows later on)

  • when assigning back to a jbyte, you'll want to clamp your value to the 0-255 range, convert to unsigned char and then convert again to signed char: I'm not certain the first conversion is strictly necessary, but you just can't be wrong if you do both

For example:

inline int fromJByte(jbyte pixel) {
    // cast to unsigned char re-interprets values as 0-255
    // cast to int will make intermediate calculations safer
    return static_cast<int>(static_cast<unsigned char>(pixel));
}

inline jbyte fromInt(int pixel) {
    if(pixel < 0)
        pixel = 0;

    if(pixel > 255)
        pixel = 255;

    return static_cast<jbyte>(static_cast<unsigned char>(pixel));
}

jbyte in = ...
int intermediate = fromJByte(in) + 30;
jbyte out = fromInt(intermediate);

Android button font size

I tried to put the font size in the styles.xml but when i went to use it it was only allowing resources from the dimen folder so put it in there instead, dont know it this is right

        <Button
                android:layout_weight="1"
                android:id="@+id/three_btn"
                android:layout_height="match_parent"
                android:layout_width="0dp"
                android:onClick="onButtonClick"
                android:textColor="#EEEEEE"
                android:textStyle="bold"
                android:textSize="@dimen/buttonFontSize"
                android:text="3"/>

Delay/Wait in a test case of Xcode UI testing

Additionally, you can just sleep:

sleep(10)

Since the UITests run in another process, this works. I don’t know how advisable it is, but it works.

Android Webview gives net::ERR_CACHE_MISS message

I tried above solution, but the following code help me to close this issue.

if (18 < Build.VERSION.SDK_INT ){
    //18 = JellyBean MR2, KITKAT=19
    mWeb.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);
}

Font.createFont(..) set color and size (java.awt.Font)

Because font doesn't have color, you need a panel to make a backgound color and give the foreground color for both JLabel (if you use JLabel) and JPanel to make font color, like example below :

JLabel lblusr = new JLabel("User name : ");
lblusr.setForeground(Color.YELLOW);

JPanel usrPanel = new JPanel();
Color maroon = new Color (128, 0, 0);
usrPanel.setBackground(maroon);
usrPanel.setOpaque(true);
usrPanel.setForeground(Color.YELLOW);
usrPanel.add(lblusr);

The background color of label is maroon with yellow font color.

Sending email with PHP from an SMTP server

There are some SMTP servers that work without authentication, but if the server requires authentication, there is no way to circumvent that.

PHP's built-in mail functions are very limited - specifying the SMTP server is possible in WIndows only. On *nix, mail() will use the OS's binaries.

If you want to send E-Mail to an arbitrary SMTP server on the net, consider using a library like SwiftMailer. That will enable you to use, for example, Google Mail's outgoing servers.

PHP Change Array Keys

If you have an array of keys that you want to use then use array_combine

Given $keys = array('a', 'b', 'c', ...) and your array, $list, then do this:

$list = array_combine($keys, array_values($list));

List will now be array('a' => 'blabla 1', ...) etc.

You have to use array_values to extract just the values from the array and not the old, numeric, keys.

That's nice and simple looking but array_values makes an entire copy of the array so you could have space issues. All we're doing here is letting php do the looping for us, not eliminate the loop. I'd be tempted to do something more like:

foreach ($list as $k => $v) {
   unset ($list[$k]);

   $new_key =  *some logic here*

   $list[$new_key] = $v;
}

I don't think it's all that more efficient than the first code but it provides more control and won't have issues with the length of the arrays.

How to determine if object is in array

Use something like this:

function containsObject(obj, list) {
    var i;
    for (i = 0; i < list.length; i++) {
        if (list[i] === obj) {
            return true;
        }
    }

    return false;
}

In this case, containsObject(car4, carBrands) is true. Remove the carBrands.push(car4); call and it will return false instead. If you later expand to using objects to store these other car objects instead of using arrays, you could use something like this instead:

function containsObject(obj, list) {
    var x;
    for (x in list) {
        if (list.hasOwnProperty(x) && list[x] === obj) {
            return true;
        }
    }

    return false;
}

This approach will work for arrays too, but when used on arrays it will be a tad slower than the first option.

jQuery hide and show toggle div with plus and minus icon

HTML:

<div class="Settings" id="GTSettings">
  <h3 class="SettingsTitle"><a class="toggle" ><img src="${appThemePath}/images/toggle-collapse-light.gif" alt="" /></a>General Theme Settings</h3>
  <div class="options">
    <table>
      <tr>
        <td>
          <h4>Back-Ground Color</h4>
        </td>
        <td>
          <input type="text" id="body-backGroundColor" class="themeselector" readonly="readonly">
        </td>
      </tr>
      <tr>
        <td>
          <h4>Text Color</h4>
        </td>
        <td>
          <input type="text" id="body-fontColor" class="themeselector" readonly="readonly">
        </td>
      </tr>
    </table>
  </div>
</div>

<div class="Settings" id="GTSettings">
  <h3 class="SettingsTitle"><a class="toggle" ><img src="${appThemePath}/images/toggle-collapse-light.gif" alt="" /></a>Content Theme Settings</h3>
  <div class="options">
    <table>
      <tr>
        <td>
          <h4>Back-Ground Color</h4>
        </td>
        <td>
          <input type="text" id="body-backGroundColor" class="themeselector" readonly="readonly">
        </td>
      </tr>
      <tr>
        <td>
          <h4>Text Color</h4>
        </td>
        <td>
          <input type="text" id="body-fontColor" class="themeselector" readonly="readonly">
        </td>
      </tr>
    </table>
  </div>
</div>

JavaScript:

$(document).ready(function() {

  $(".options").hide();
  $(".SettingsTitle").click(function(e) {
    var appThemePath = $("#appThemePath").text();

    var closeMenuImg = appThemePath + '/images/toggle-collapse-light.gif';
    var openMenuImg = appThemePath + '/images/toggle-collapse-dark.gif';

    var elem = $(this).next('.options');
    $('.options').not(elem).hide('fast');
    $('.SettingsTitle').not($(this)).parent().children("h3").children("a.toggle").children("img").attr('src', closeMenuImg);
    elem.toggle('fast');
    var targetImg = $(this).parent().children("h3").children("a.toggle").children("img").attr('src') === closeMenuImg ? openMenuImg : closeMenuImg;
    $(this).parent().children("h3").children("a.toggle").children("img").attr('src', targetImg);
  });

});

Visual Studio Code pylint: Unable to import 'protorpc'

I find the solutions stated above very useful. Especially the Python's Virtual Environment explanation by jrc.

In my case, I was using Docker and was editing 'local' files (not direcly inside the docker). So I installed Remote Development extension by Microsoft.

ext install ms-vscode-remote.vscode-remote-extensionpack

More details can be found at https://marketplace.visualstudio.com/items?itemName=ms-vscode-remote.vscode-remote-extensionpack

I should say, it was not easy to play around at first. What worked for me was...
1. starting docker
2. In vscode, Remote-container: Attach to running container
3. Adding folder /code/<path-to-code-folder> from root of the machine to vscode

and then installing python extension + pylint

C: printf a float value

You can do it like this:

printf("%.6f", myFloat);

6 represents the number of digits after the decimal separator.

Make DateTimePicker work as TimePicker only in WinForms

A snippet out of the MSDN:

'The following code sample shows how to create a DateTimePicker that enables users to choose a time only.'

timePicker = new DateTimePicker();
timePicker.Format = DateTimePickerFormat.Time;
timePicker.ShowUpDown = true;

How to find memory leak in a C++ code/project?

In addition to the tools and methodes provided in the other anwers, static code analysis tools can be used to detect memory leaks (and other issues as well). A free an robust tool is Cppcheck. But there are a lot of other tools available. Wikipedia has a list of static code analysis tools.

ipynb import another ipynb file

It is really simple in newer Jupyter:

%run MyOtherNotebook.ipynb

How to add item to the beginning of List<T>?

Since .NET 4.7.1, you can use the side-effect free Prepend() and Append(). The output is going to be an IEnumerable.

// Creating an array of numbers
var ti = new List<int> { 1, 2, 3 };

// Prepend and Append any value of the same type
var results = ti.Prepend(0).Append(4);

// output is 0, 1, 2, 3, 4
Console.WriteLine(string.Join(", ", results ));

How do I add a new column to a Spark DataFrame (using PySpark)?

You can define a new udf when adding a column_name:

u_f = F.udf(lambda :yourstring,StringType())
a.select(u_f().alias('column_name')

How to set space between listView Items in Android

In order to give spacing between views inside a listView please use padding on your inflate views.

You can use android:paddingBottom="(number)dp" && android:paddingTop="(number)dp" on your view or views you're inflate inside your listview.

The divider solution is just a fix, because some day, when you'll want to use a divider color (right now it's transparent) you will see that the divider line is been stretched.

Java ArrayList - how can I tell if two lists are equal, order not mattering?

If you don't hope to sort the collections and you need the result that ["A" "B" "C"] is not equals to ["B" "B" "A" "C"],

l1.containsAll(l2)&&l2.containsAll(l1)

is not enough, you propably need to check the size too :

    List<String> l1 =Arrays.asList("A","A","B","C");
    List<String> l2 =Arrays.asList("A","B","C");
    List<String> l3 =Arrays.asList("A","B","C");

    System.out.println(l1.containsAll(l2)&&l2.containsAll(l1));//cautions, this will be true
    System.out.println(isListEqualsWithoutOrder(l1,l2));//false as expected

    System.out.println(l3.containsAll(l2)&&l2.containsAll(l3));//true as expected
    System.out.println(isListEqualsWithoutOrder(l2,l3));//true as expected


    public static boolean isListEqualsWithoutOrder(List<String> l1, List<String> l2) {
        return l1.size()==l2.size() && l1.containsAll(l2)&&l2.containsAll(l1);
}

How do I measure request and response times at once using cURL?

Another way is configuring ~/.curlrc like this

-w "\n\n==== cURL measurements stats ====\ntotal: %{time_total} seconds \nsize: %{size_download} bytes \ndnslookup: %{time_namelookup} seconds \nconnect: %{time_connect} seconds \nappconnect: %{time_appconnect} seconds \nredirect: %{time_redirect} seconds \npretransfer: %{time_pretransfer} seconds \nstarttransfer: %{time_starttransfer} seconds \ndownloadspeed: %{speed_download} byte/sec \nuploadspeed: %{speed_upload} byte/sec \n\n"

So the output of curl is

?? curl -I https://google.com
HTTP/2 301
location: https://www.google.com/
content-type: text/html; charset=UTF-8
date: Mon, 04 Mar 2019 08:02:43 GMT
expires: Wed, 03 Apr 2019 08:02:43 GMT
cache-control: public, max-age=2592000
server: gws
content-length: 220
x-xss-protection: 1; mode=block
x-frame-options: SAMEORIGIN
alt-svc: quic=":443"; ma=2592000; v="44,43,39"



==== cURL measurements stats ====
total: 0.211117 seconds
size: 0 bytes
dnslookup: 0.067179 seconds
connect: 0.098817 seconds
appconnect: 0.176232 seconds
redirect: 0.000000 seconds
pretransfer: 0.176438 seconds
starttransfer: 0.209634 seconds
downloadspeed: 0.000 byte/sec
uploadspeed: 0.000 byte/sec

Best C# API to create PDF

Update:

I'm not sure when or if the license changed for the iText# library, but it is licensed under AGPL which means it must be licensed if included with a closed-source product. The question does not (currently) require free or open-source libraries. One should always investigate the license type of any library used in a project.


I have used iText# with success in .NET C# 3.5; it is a port of the open source Java library for PDF generation and it's free.

There is a NuGet package available for iTextSharp version 5 and the official developer documentation, as well as C# examples, can be found at itextpdf.com

How to get datas from List<Object> (Java)?

You should try something like this

List xx= (List) list.get(0)
String id = (String) xx.get(0)

or if you have a House value object the result of the query is of the same type, then

House myhouse = (House) list.get(0);

Detect if user is scrolling

You just said javascript in your tags, so @Wampie Driessen post could helps you.

I want also to contribute, so you can use the following when using jQuery if you need it.

 //Firefox
 $('#elem').bind('DOMMouseScroll', function(e){
     if(e.detail > 0) {
         //scroll down
         console.log('Down');
     }else {
         //scroll up
         console.log('Up');
     }

     //prevent page fom scrolling
     return false;
 });

 //IE, Opera, Safari
 $('#elem').bind('mousewheel', function(e){
     if(e.wheelDelta< 0) {
         //scroll down
         console.log('Down');
     }else {
         //scroll up
         console.log('Up');
     }

     //prevent page fom scrolling
     return false;
 });

Another example:

$(function(){
    var _top = $(window).scrollTop();
    var _direction;
    $(window).scroll(function(){
        var _cur_top = $(window).scrollTop();
        if(_top < _cur_top)
        {
            _direction = 'down';
        }
        else
        {
            _direction = 'up';
        }
        _top = _cur_top;
        console.log(_direction);
    });
});?

I want to add a JSONObject to a JSONArray and that JSONArray included in other JSONObject

org.json.simple.JSONArray resultantJson = new org.json.simple.JSONArray();

        org.json.JSONArray o1 = new org.json.JSONArray("[{\"one\":[],\"two\":\"abc\"}]");
        org.json.JSONArray o2 = new org.json.JSONArray("[{\"three\":[1,2],\"four\":\"def\"}]");


        resultantJson.addAll(o1.toList());
        resultantJson.addAll(o2.toList());

Storing Images in DB - Yea or Nay?

Another benefit of storing the images in the file system is that you don't have to do anything special to have the client cache them...

...unless of course the image isn't accessible via the document root (e.g. authentication barrier), in which case you'll need to check the cache-control headers your code is sending.

How should I do integer division in Perl?

int(x+.5) will round positive values toward the nearest integer. Rounding up is harder.

To round toward zero:

int($x)

For the solutions below, include the following statement:

use POSIX;

To round down: POSIX::floor($x)

To round up: POSIX::ceil($x)

To round away from zero: POSIX::floor($x) - int($x) + POSIX::ceil($x)

To round off to the nearest integer: POSIX::floor($x+.5)

Note that int($x+.5) fails badly for negative values. int(-2.1+.5) is int(-1.6), which is -1.

How to retrieve Request Payload

Also you can setup extJs writer with encode: true and it will send data regularly (and, hence, you will be able to retrieve data via $_POST and $_GET).

... the values will be sent as part of the request parameters as opposed to a raw post (via docs for encode config of Ext.data.writer.Json)

UPDATE

Also docs say that:

The encode option should only be set to true when a root is defined

So, probably, writer's root config is required.

npm ERR! registry error parsing json - While trying to install Cordova for Ionic Framework in Windows 8

My npm install worked fine, but I had this problem with npm update. To fix it, I had to run npm cache clean and then npm cache clear.

Scripting SQL Server permissions

You can get SQL Server Management Studio to do it for you:

  • Right click the database you want to export permissions for
  • Select 'Tasks' then 'Generate Scripts...'
  • Confirm the database you're scripting
  • Set the following scripting options:
    • Script Create: FALSE
    • Script Object-Level Permissions: TRUE
  • Select the object types whose permission you want to script
  • Select the objects whose permission you want to script
  • Select where you want the script produced

This will produce a script to set permissions for all selected objects but suppresses the object scripts themselves.

This is based on the dialog for MS SQL 2008 with all other scripting options unchanged from install defaults.

Android simple alert dialog

No my friend its very simple, try using this:

AlertDialog alertDialog = new AlertDialog.Builder(AlertDialogActivity.this).create();
alertDialog.setTitle("Alert Dialog");
alertDialog.setMessage("Welcome to dear user.");
alertDialog.setIcon(R.drawable.welcome);

alertDialog.setButton(AlertDialog.BUTTON_POSITIVE, "OK", new DialogInterface.OnClickListener() {
    public void onClick(DialogInterface dialog, int which) {
        Toast.makeText(getApplicationContext(), "You clicked on OK", Toast.LENGTH_SHORT).show();
    }
});

alertDialog.show();

This tutorial shows how you can create custom dialog using xml and then show them as an alert dialog.

Calculate percentage saved between two numbers?

I know this is fairly old but I figured this was as good as any to put this. I found a post from yahoo with a good explanation:

Let's say you have two numbers, 40 and 30.  

  30/40*100 = 75.
  So 30 is 75% of 40.  

  40/30*100 = 133. 
  So 40 is 133% of 30. 

The percentage increase from 30 to 40 is:  
  (40-30)/30 * 100 = 33%  

The percentage decrease from 40 to 30 is:
  (40-30)/40 * 100 = 25%. 

These calculations hold true whatever your two numbers.

Original Post

how to parse a "dd/mm/yyyy" or "dd-mm-yyyy" or "dd-mmm-yyyy" formatted date string using JavaScript or jQuery

You might want to use helper library like http://momentjs.com/ which wraps the native javascript date object for easier manipulations

Then you can do things like:

var day = moment("12-25-1995", "MM-DD-YYYY");

or

var day = moment("25/12/1995", "DD/MM/YYYY");

then operate on the date

day.add('days', 7)

and to get the native javascript date

day.toDate();

Submitting HTML form using Jquery AJAX

Quick Description of AJAX

AJAX is simply Asyncronous JSON or XML (in most newer situations JSON). Because we are doing an ASYNC task we will likely be providing our users with a more enjoyable UI experience. In this specific case we are doing a FORM submission using AJAX.

Really quickly there are 4 general web actions GET, POST, PUT, and DELETE; these directly correspond with SELECT/Retreiving DATA, INSERTING DATA, UPDATING/UPSERTING DATA, and DELETING DATA. A default HTML/ASP.Net webform/PHP/Python or any other form action is to "submit" which is a POST action. Because of this the below will all describe doing a POST. Sometimes however with http you might want a different action and would likely want to utilitize .ajax.

My code specifically for you (described in code comments):

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/* attach a submit handler to the form */
$("#formoid").submit(function(event) {

  /* stop form from submitting normally */
  event.preventDefault();

  /* get the action attribute from the <form action=""> element */
  var $form = $(this),
    url = $form.attr('action');

  /* Send the data using post with element id name and name2*/
  var posting = $.post(url, {
    name: $('#name').val(),
    name2: $('#name2').val()
  });

  /* Alerts the results */
  posting.done(function(data) {
    $('#result').text('success');
  });
  posting.fail(function() {
    $('#result').text('failed');
  });
});
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<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<form id="formoid" action="studentFormInsert.php" title="" method="post">
  <div>
    <label class="title">First Name</label>
    <input type="text" id="name" name="name">
  </div>
  <div>
    <label class="title">Last Name</label>
    <input type="text" id="name2" name="name2">
  </div>
  <div>
    <input type="submit" id="submitButton" name="submitButton" value="Submit">
  </div>
</form>

<div id="result"></div>
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Documentation

From jQuery website $.post documentation.

Example: Send form data using ajax requests

$.post("test.php", $("#testform").serialize());

Example: Post a form using ajax and put results in a div

<!DOCTYPE html>
<html>
    <head>
        <script src="http://code.jquery.com/jquery-1.9.1.js"></script>
    </head>
    <body>
        <form action="/" id="searchForm">
            <input type="text" name="s" placeholder="Search..." />
            <input type="submit" value="Search" />
        </form>
        <!-- the result of the search will be rendered inside this div -->
        <div id="result"></div>
        <script>
            /* attach a submit handler to the form */
            $("#searchForm").submit(function(event) {

                /* stop form from submitting normally */
                event.preventDefault();

                /* get some values from elements on the page: */
                var $form = $(this),
                    term = $form.find('input[name="s"]').val(),
                    url = $form.attr('action');

                /* Send the data using post */
                var posting = $.post(url, {
                    s: term
                });

                /* Put the results in a div */
                posting.done(function(data) {
                    var content = $(data).find('#content');
                    $("#result").empty().append(content);
                });
            });
        </script>
    </body>
</html>

Important Note

Without using OAuth or at minimum HTTPS (TLS/SSL) please don't use this method for secure data (credit card numbers, SSN, anything that is PCI, HIPAA, or login related)

How to redirect output of an entire shell script within the script itself?

Addressing the question as updated.

#...part of script without redirection...

{
    #...part of script with redirection...
} > file1 2>file2 # ...and others as appropriate...

#...residue of script without redirection...

The braces '{ ... }' provide a unit of I/O redirection. The braces must appear where a command could appear - simplistically, at the start of a line or after a semi-colon. (Yes, that can be made more precise; if you want to quibble, let me know.)

You are right that you can preserve the original stdout and stderr with the redirections you showed, but it is usually simpler for the people who have to maintain the script later to understand what's going on if you scope the redirected code as shown above.

The relevant sections of the Bash manual are Grouping Commands and I/O Redirection. The relevant sections of the POSIX shell specification are Compound Commands and I/O Redirection. Bash has some extra notations, but is otherwise similar to the POSIX shell specification.

How to fire AJAX request Periodically?

Yes, you could use either the JavaScript setTimeout() method or setInterval() method to invoke the code that you would like to run. Here's how you might do it with setTimeout:

function executeQuery() {
  $.ajax({
    url: 'url/path/here',
    success: function(data) {
      // do something with the return value here if you like
    }
  });
  setTimeout(executeQuery, 5000); // you could choose not to continue on failure...
}

$(document).ready(function() {
  // run the first time; all subsequent calls will take care of themselves
  setTimeout(executeQuery, 5000);
});