Programs & Examples On #Spsitedataquery

An implementation of the fast Fourier transform (FFT) in C#

http://www.exocortex.org/dsp/ is an open-source C# mathematics library with FFT algorithms.

ImportError: DLL load failed: %1 is not a valid Win32 application. But the DLL's are there

In my case, I have 64bit python, and it was lxml that was the wrong version--I should have been using the x64 version of that as well. I solved this by downloading the 64-bit version of lxml here:

https://pypi.python.org/pypi/lxml/3.4.1

lxml-3.4.1.win-amd64-py2.7.exe

This was the simplest answer to a frustrating issue.

Using atan2 to find angle between two vectors

Here a little program in Python that uses the angle between vectors to determine if a point is inside or outside a certain polygon

import sys
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.patches as patches
from shapely.geometry import Point, Polygon
from pprint import pprint

# Plot variables
x_min, x_max = -6, 12
y_min, y_max = -3, 8
tick_interval = 1
FIG_SIZE = (10, 10)
DELTA_ERROR = 0.00001
IN_BOX_COLOR = 'yellow'
OUT_BOX_COLOR = 'black'


def angle_between(v1, v2):
    """ Returns the angle in radians between vectors 'v1' and 'v2'
        The sign of the angle is dependent on the order of v1 and v2
        so acos(norm(dot(v1, v2))) does not work and atan2 has to be used, see:
        https://stackoverflow.com/questions/21483999/using-atan2-to-find-angle-between-two-vectors
    """
    arg1 = np.cross(v1, v2)
    arg2 = np.dot(v1, v2)
    angle = np.arctan2(arg1, arg2)
    return angle


def point_inside(point, border):
    """ Returns True if point is inside border polygon and False if not
        Arguments:
        :point: x, y in shapely.geometry.Point type
        :border: [x1 y1, x2 y2, ... , xn yn] in shapely.geomettry.Polygon type
    """    
    assert len(border.exterior.coords) > 2,\
        'number of points in the polygon must be > 2'

    point = np.array(point)
    side1 = np.array(border.exterior.coords[0]) - point
    sum_angles = 0
    for border_point in border.exterior.coords[1:]:
        side2 = np.array(border_point) - point
        angle = angle_between(side1, side2)
        sum_angles += angle
        side1 = side2

    # if wn is 1 then the point is inside
    wn = sum_angles / 2 / np.pi
    if abs(wn - 1) < DELTA_ERROR:
        return True
    else:
        return False


class MainMap():

    @classmethod
    def settings(cls, fig_size):
        # set the plot outline, including axes going through the origin
        cls.fig, cls.ax = plt.subplots(figsize=fig_size)
        cls.ax.set_xlim(-x_min, x_max)
        cls.ax.set_ylim(-y_min, y_max)
        cls.ax.set_aspect(1)
        tick_range_x = np.arange(round(x_min + (10*(x_max - x_min) % tick_interval)/10, 1),
            x_max + 0.1, step=tick_interval)
        tick_range_y = np.arange(round(y_min + (10*(y_max - y_min) % tick_interval)/10, 1), 
            y_max + 0.1, step=tick_interval)
        cls.ax.set_xticks(tick_range_x)
        cls.ax.set_yticks(tick_range_y)
        cls.ax.tick_params(axis='both', which='major', labelsize=6)
        cls.ax.spines['left'].set_position('zero')
        cls.ax.spines['right'].set_color('none')
        cls.ax.spines['bottom'].set_position('zero')
        cls.ax.spines['top'].set_color('none')

    @classmethod
    def get_ax(cls):
        return cls.ax

    @staticmethod
    def plot():
        plt.tight_layout()
        plt.show()


class PlotPointandRectangle(MainMap):

    def __init__(self, start_point, rectangle_polygon, tolerance=0):

        self.current_object = None
        self.currently_dragging = False
        self.fig.canvas.mpl_connect('key_press_event', self.on_key)
        self.plot_types = ['o', 'o-']
        self.plot_type = 1
        self.rectangle = rectangle_polygon

        # define a point that can be moved around
        self.point = patches.Circle((start_point.x, start_point.y), 0.10,
            alpha=1)
        if point_inside(start_point, self.rectangle):
            _color = IN_BOX_COLOR
        else:
            _color = OUT_BOX_COLOR
        self.point.set_color(_color)
        self.ax.add_patch(self.point)
        self.point.set_picker(tolerance)
        cv_point = self.point.figure.canvas
        cv_point.mpl_connect('button_release_event', self.on_release)
        cv_point.mpl_connect('pick_event', self.on_pick)
        cv_point.mpl_connect('motion_notify_event', self.on_motion)

        self.plot_rectangle()

    def plot_rectangle(self):
        x = [point[0] for point in self.rectangle.exterior.coords]
        y = [point[1] for point in self.rectangle.exterior.coords]
        # y = self.rectangle.y
        self.rectangle_plot, = self.ax.plot(x, y,
            self.plot_types[self.plot_type], color='r', lw=0.4, markersize=2)

    def on_release(self, event):
        self.current_object = None
        self.currently_dragging = False

    def on_pick(self, event):
        self.currently_dragging = True
        self.current_object = event.artist

    def on_motion(self, event):
        if not self.currently_dragging:
            return
        if self.current_object == None:
            return

        point = Point(event.xdata, event.ydata)
        self.current_object.center = point.x, point.y
        if point_inside(point, self.rectangle):
            _color = IN_BOX_COLOR
        else:
            _color = OUT_BOX_COLOR
        self.current_object.set_color(_color)

        self.point.figure.canvas.draw()

    def remove_rectangle_from_plot(self):
        try:
            self.rectangle_plot.remove()
        except ValueError:
            pass

    def on_key(self, event):
        # with 'space' toggle between just points or points connected with
        # lines
        if event.key == ' ':
            self.plot_type = (self.plot_type + 1) % 2
            self.remove_rectangle_from_plot()
            self.plot_rectangle()
            self.point.figure.canvas.draw()


def main(start_point, rectangle):

    MainMap.settings(FIG_SIZE)
    plt_me = PlotPointandRectangle(start_point, rectangle)  #pylint: disable=unused-variable
    MainMap.plot()

if __name__ == "__main__":
    try:
        start_point = Point([float(val) for val in sys.argv[1].split()])
    except IndexError:
        start_point= Point(0, 0)

    border_points = [(-2, -2),
                     (1, 1),
                     (3, -1),
                     (3, 3.5),
                     (4, 1),
                     (5, 1),
                     (4, 3.5),
                     (5, 6),
                     (3, 4),
                     (3, 5),
                     (-0.5, 1),
                     (-3, 1),
                     (-1, -0.5),
                    ]               

    border_points_polygon = Polygon(border_points)
    main(start_point, border_points_polygon)

window.history.pushState refreshing the browser

window.history.pushState({urlPath:'/page1'},"",'/page1')

Only works after page is loaded, and when you will click on refresh it doesn't mean that there is any real URL.

What you should do here is knowing to which URL you are getting redirected when you reload this page. And on that page you can get the conditions by getting the current URL and making all of your conditions.

Explanation of 'String args[]' and static in 'public static void main(String[] args)'

If I were explaining this to someone I'd say we'll get to it later for now you need to know that the way to run your program is to use :

public static void main(String[] args) {
        ...
    }

Assuming he/she knows what an array is, I'd say the args is an argument array and you can show some cool examples.

Then after you've gone a bit about Java/JVM and that stuff, you'd get to modifiers eventually to static and public as well.

Then you can spend some time talking about meaning of these IMHO.

You could mention other "cool" stuff such as varargs that you can use this in later versions of Java.

public static void main(String ...args) {
        //...
    }

How to loop and render elements in React.js without an array of objects to map?

I'm using Object.keys(chars).map(...) to loop in render

// chars = {a:true, b:false, ..., z:false}

render() {
    return (
       <div>
        {chars && Object.keys(chars).map(function(char, idx) {
            return <span key={idx}>{char}</span>;
        }.bind(this))}
        "Some text value"
       </div>
    );
}

Running Tensorflow in Jupyter Notebook

  1. Install Anaconda
  2. Run Anaconda command prompt
  3. write "activate tensorflow" for windows
  4. pip install tensorflow
  5. pip install jupyter notebook
  6. jupyter notebook.

Only this solution worked for me. Tried 7 8 solutions. Using Windows platform.

Protect image download

Try this one-

<script>
    (function($){
      $(document).on('contextmenu', 'img', function() {
          return false;
      })
    })(jQuery);
  </script>

Recursive search and replace in text files on Mac and Linux

None of the above work on OSX.

Do the following:

perl -pi -w -e 's/SEARCH_FOR/REPLACE_WITH/g;' *.txt

How do you change text to bold in Android?

In the ideal world you would set the text style attribute in you layout XML definition like that:

<TextView
    android:id="@+id/TextView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textStyle="bold"/>

There is a simple way to achieve the same result dynamically in your code by using setTypeface method. You need to pass and object of Typeface class, which will describe the font style for that TextView. So to achieve the same result as with the XML definition above you can do the following:

TextView Tv = (TextView) findViewById(R.id.TextView);
Typeface boldTypeface = Typeface.defaultFromStyle(Typeface.BOLD);
Tv.setTypeface(boldTypeface);

The first line will create the object form predefined style (in this case Typeface.BOLD, but there are many more predefined). Once we have an instance of typeface we can set it on the TextView. And that's it our content will be displayed on the style we defined.

I hope it helps you a lot.For better info you can visit

http://developer.android.com/reference/android/graphics/Typeface.html

Adding Counter in shell script

Try this:

counter=0
while true; do
  if /home/hadoop/latest/bin/hadoop fs -ls /apps/hdtech/bds/quality-rt/dt=$DATE_YEST_FORMAT2 then
       echo "Files Present" | mailx -s "File Present"  -r [email protected] [email protected]
       break
  elif [[ "$counter" -gt 20 ]]; then
       echo "Counter limit reached, exit script."
       exit 1
  else
       let counter++
       echo "Sleeping for another half an hour" | mailx -s "Time to Sleep Now"  -r [email protected] [email protected]
       sleep 1800
  fi
done

Explanation

  • break - if files are present, it will break and allow the script to process the files.
  • [[ "$counter" -gt 20 ]] - if the counter variable is greater than 20, the script will exit.
  • let counter++ - increments the counter by 1 at each pass.

How can I convert an image into Base64 string using JavaScript?

Try this code:

For a file upload change event, call this function:

$("#fileproof").on('change', function () {
    readImage($(this)).done(function (base64Data) { $('#<%=hfimgbs64.ClientID%>').val(base64Data); });
});

function readImage(inputElement) {
    var deferred = $.Deferred();

    var files = inputElement.get(0).files;

    if (files && files[0]) {
        var fr = new FileReader();
        fr.onload = function (e) {
            deferred.resolve(e.target.result);
        };
        fr.readAsDataURL(files[0]);
    } else {
        deferred.resolve(undefined);
    }

    return deferred.promise();
}

Store Base64 data in hidden filed to use.

How do I concatenate strings with variables in PowerShell?

Try this

Get-ChildItem  | % { Write-Host "$($_.FullName)\$buildConfig\$($_.Name).dll" }

In your code,

  1. $build-Config is not a valid variable name.
  2. $.FullName should be $_.FullName
  3. $ should be $_.Name

Jquery find nearest matching element

Get the .column parent of the this element, get its previous sibling, then find any input there:

$(this).closest(".column").prev().find("input:first").val();

Demo: http://jsfiddle.net/aWhtP/

Creating composite primary key in SQL Server

If you use management studio, simply select the wardNo, BHTNo, testID columns and click on the key mark in the toolbar.

enter image description here

Command for this is,

ALTER TABLE dbo.testRequest
ADD CONSTRAINT PK_TestRequest 
PRIMARY KEY (wardNo, BHTNo, TestID)

Html: Difference between cell spacing and cell padding

CellSpacing as the name suggests it is the Space between the Adjacent cells and CellPadding on the other hand means the padding around the cell content.

How could I convert data from string to long in c#

http://msdn.microsoft.com/en-us/library/system.convert.aspx

l1 = Convert.ToInt64(strValue)

Though the example you gave isn't an integer, so I'm not sure why you want it as a long.

How do I install Python OpenCV through Conda?

You can install OpenCV by running these commands in the Anaconda command prompt:

conda config --add channels conda-forge

conda install libopencv opencv py-opencv

Source:

https://github.com/conda-forge/opencv-feedstock

Nginx location priority

There is a handy online tool for testing location priority now:
location priority testing online

How to get full file path from file name?

private const string BulkSetPriceFile = "test.txt";
...
var fullname = Path.GetFullPath(BulkSetPriceFile);

Run a single migration file

If you're having trouble with paths you can use

require Rails.root + 'db/migrate/20090408054532_add_foos.rb'

Violation of PRIMARY KEY constraint. Cannot insert duplicate key in object

What is the value you're passing to the primary key (presumably "pk_OrderID")? You can set it up to auto increment, and then there should never be a problem with duplicating the value - the DB will take care of that. If you need to specify a value yourself, you'll need to write code to determine what the max value for that field is, and then increment that.

If you have a column named "ID" or such that is not shown in the query, that's fine as long as it is set up to autoincrement - but it's probably not, or you shouldn't get that err msg. Also, you would be better off writing an easier-on-the-eye query and using params. As the lad of nine years hence inferred, you're leaving your database open to SQL injection attacks if you simply plop in user-entered values. For example, you could have a method like this:

internal static int GetItemIDForUnitAndItemCode(string qry, string unit, string itemCode)
{
    int itemId;
    using (SqlConnection sqlConn = new SqlConnection(ReportRunnerConstsAndUtils.CPSConnStr))
    {
        using (SqlCommand cmd = new SqlCommand(qry, sqlConn))
        {
            cmd.CommandType = CommandType.Text;
            cmd.Parameters.Add("@Unit", SqlDbType.VarChar, 25).Value = unit;
            cmd.Parameters.Add("@ItemCode", SqlDbType.VarChar, 25).Value = itemCode;
            sqlConn.Open();
            itemId = Convert.ToInt32(cmd.ExecuteScalar());
        }
    }
    return itemId;
}

...that is called like so:

int itemId = SQLDBHelper.GetItemIDForUnitAndItemCode(GetItemIDForUnitAndItemCodeQuery, _unit, itemCode);

You don't have to, but I store the query separately:

public static readonly String GetItemIDForUnitAndItemCodeQuery = "SELECT PoisonToe FROM Platypi WHERE Unit = @Unit AND ItemCode = @ItemCode";

You can verify that you're not about to insert an already-existing value by (pseudocode):

bool alreadyExists = IDAlreadyExists(query, value) > 0;

The query is something like "SELECT COUNT FROM TABLE WHERE BLA = @CANDIDATEIDVAL" and the value is the ID you're potentially about to insert:

if (alreadyExists) // keep inc'ing and checking until false, then use that id value

Justin wants to know if this will work:

string exists = "SELECT 1 from AC_Shipping_Addresses where pk_OrderID = " _Order.OrderNumber; if (exists > 0)...

What seems would work to me is:

string existsQuery = string.format("SELECT 1 from AC_Shipping_Addresses where pk_OrderID = {0}", _Order.OrderNumber); 
// Or, better yet:
string existsQuery = "SELECT COUNT(*) from AC_Shipping_Addresses where pk_OrderID = @OrderNumber"; 
// Now run that query after applying a value to the OrderNumber query param (use code similar to that above); then, if the result is > 0, there is such a record.

When should I use GC.SuppressFinalize()?

SuppressFinalize should only be called by a class that has a finalizer. It's informing the Garbage Collector (GC) that this object was cleaned up fully.

The recommended IDisposable pattern when you have a finalizer is:

public class MyClass : IDisposable
{
    private bool disposed = false;

    protected virtual void Dispose(bool disposing)
    {
        if (!disposed)
        {
            if (disposing)
            {
                // called via myClass.Dispose(). 
                // OK to use any private object references
            }
            // Release unmanaged resources.
            // Set large fields to null.                
            disposed = true;
        }
    }

    public void Dispose() // Implement IDisposable
    {
        Dispose(true);
        GC.SuppressFinalize(this);
    }

    ~MyClass() // the finalizer
    {
        Dispose(false);
    }
}

Normally, the CLR keeps tabs on objects with a finalizer when they are created (making them more expensive to create). SuppressFinalize tells the GC that the object was cleaned up properly and doesn't need to go onto the finalizer queue. It looks like a C++ destructor, but doesn't act anything like one.

The SuppressFinalize optimization is not trivial, as your objects can live a long time waiting on the finalizer queue. Don't be tempted to call SuppressFinalize on other objects mind you. That's a serious defect waiting to happen.

Design guidelines inform us that a finalizer isn't necessary if your object implements IDisposable, but if you have a finalizer you should implement IDisposable to allow deterministic cleanup of your class.

Most of the time you should be able to get away with IDisposable to clean up resources. You should only need a finalizer when your object holds onto unmanaged resources and you need to guarantee those resources are cleaned up.

Note: Sometimes coders will add a finalizer to debug builds of their own IDisposable classes in order to test that code has disposed their IDisposable object properly.

public void Dispose() // Implement IDisposable
{
    Dispose(true);
#if DEBUG
    GC.SuppressFinalize(this);
#endif
}

#if DEBUG
~MyClass() // the finalizer
{
    Dispose(false);
}
#endif

How to program a fractal?

I would start with something simple, like a Koch Snowflake. It's a simple process of taking a line and transforming it, then repeating the process recursively until it looks neat-o.

Something super simple like taking 2 points (a line) and adding a 3rd point (making a corner), then repeating on each new section that's created.

fractal(p0, p1){
    Pmid = midpoint(p0,p1) + moved some distance perpendicular to p0 or p1;
    fractal(p0,Pmid);
    fractal(Pmid, p1);
}

Javascript Array inside Array - how can I call the child array name?

You've made an array of arrays (multidimensional), so options[0] in this case is the size array. you need to reference the first element of the child, which for you is: options[0][0].

If you wanted to loop through all entries you can use the for .. in ... syntax which is described here.

var a = [1,2,4,5,120,12];
for (var val in t) {
    console.log(t[val]);
}

var b = ['S','M','L'];
var both = [a,b];

for (var val in both) {
     for(val2 in both[val]){console.log(both[val][val2])}
}

Replace multiple strings at once

You could extend the String object with your own function that does what you need (useful if there's ever missing functionality):

String.prototype.replaceArray = function(find, replace) {
  var replaceString = this;
  for (var i = 0; i < find.length; i++) {
    replaceString = replaceString.replace(find[i], replace[i]);
  }
  return replaceString;
};

For global replace you could use regex:

String.prototype.replaceArray = function(find, replace) {
  var replaceString = this;
  var regex; 
  for (var i = 0; i < find.length; i++) {
    regex = new RegExp(find[i], "g");
    replaceString = replaceString.replace(regex, replace[i]);
  }
  return replaceString;
};

To use the function it'd be similar to your PHP example:

var textarea = $(this).val();
var find = ["<", ">", "\n"];
var replace = ["&lt;", "&gt;", "<br/>"];
textarea = textarea.replaceArray(find, replace);

C++ Remove new line from multiline string

If the newline is expected to be at the end of the string, then:

if (!s.empty() && s[s.length()-1] == '\n') {
    s.erase(s.length()-1);
}

If the string can contain many newlines anywhere in the string:

std::string::size_type i = 0;
while (i < s.length()) {
    i = s.find('\n', i);
    if (i == std::string:npos) {
        break;
    }
    s.erase(i);
}

How to load all the images from one of my folder into my web page, using Jquery/Javascript

Based on the answer of Roko C. Buljan, I have created this method which gets images from a folder and its subfolders . This might need some error handling but works fine for a simple folder structure.

var findImages = function(){
    var parentDir = "./Resource/materials/";

    var fileCrowler = function(data){
        var titlestr = $(data).filter('title').text();
        // "Directory listing for /Resource/materials/xxx"
        var thisDirectory = titlestr.slice(titlestr.indexOf('/'), titlestr.length)

        //List all image file names in the page
        $(data).find("a").attr("href", function (i, filename) {
            if( filename.match(/\.(jpe?g|png|gif)$/) ) { 
                var fileNameWOExtension = filename.slice(0, filename.lastIndexOf('.'))
                var img_html = "<img src='{0}' id='{1}' alt='{2}' width='75' height='75' hspace='2' vspace='2' onclick='onImageSelection(this);'>".format(thisDirectory + filename, fileNameWOExtension, fileNameWOExtension);
                $("#image_pane").append(img_html);
            }
            else{ 
                $.ajax({
                    url: thisDirectory + filename,
                    success: fileCrowler
                });
            }
        });}

        $.ajax({
        url: parentDir,
        success: fileCrowler
    });
}

What is the purpose of the "final" keyword in C++11 for functions?

Nothing to add to the semantic aspects of "final".

But I'd like to add to chris green's comment that "final" might become a very important compiler optimization technique in the not so distant future. Not only in the simple case he mentioned, but also for more complex real-world class hierarchies which can be "closed" by "final", thus allowing compilers to generate more efficient dispatching code than with the usual vtable approach.

One key disadvantage of vtables is that for any such virtual object (assuming 64-bits on a typical Intel CPU) the pointer alone eats up 25% (8 of 64 bytes) of a cache line. In the kind of applications I enjoy to write, this hurts very badly. (And from my experience it is the #1 argument against C++ from a purist performance point of view, i.e. by C programmers.)

In applications which require extreme performance, which is not so unusual for C++, this might indeed become awesome, not requiring to workaround this problem manually in C style or weird Template juggling.

This technique is known as Devirtualization. A term worth remembering. :-)

There is a great recent speech by Andrei Alexandrescu which pretty well explains how you can workaround such situations today and how "final" might be part of solving similar cases "automatically" in the future (discussed with listeners):

http://channel9.msdn.com/Events/GoingNative/2013/Writing-Quick-Code-in-Cpp-Quickly

Writing an mp4 video using python opencv

fourcc = cv2.VideoWriter_fourcc(*'mp4v')

'mp4v' returns no errors unlike 'MP4V' which is defined inside fourcc

for the error "OpenCV: FFMPEG: tag 0x5634504d/'MP4V' is not supported with codec id 13 and format 'mp4 / MP4 (MPEG-4 Part 14)' OpenCV: FFMPEG: fallback to use tag 0x00000020/' ???'"

Send password when using scp to copy files from one server to another

Firts as mentioned by David, we need to set up public/private key.

Then using below command had worked for me, means it didn't prompt me for password as we are passing private key in the command using -i option

scp -i path/to/private_key path/to/local/file remoteUserId@remoteHost:/path/to/remote/folder

Here path/to/private_key is private key file which we generated while setting up public/private key.

ElasticSearch - Return Unique Values

I am looking for this kind of solution for my self as well. I found reference in terms aggregation.

So, according to that following is the proper solution.

{
"aggs" : {
    "langs" : {
        "terms" : { "field" : "language",  
                    "size" : 500 }
    }
}}

But if you ran into following error:

"error": {
        "root_cause": [
            {
                "type": "illegal_argument_exception",
                "reason": "Fielddata is disabled on text fields by default. Set fielddata=true on [fastest_method] in order to load fielddata in memory by uninverting the inverted index. Note that this can however use significant memory. Alternatively use a keyword field instead."
            }
        ]}

In that case, you have to add "KEYWORD" in the request, like following:

   {
    "aggs" : {
        "langs" : {
            "terms" : { "field" : "language.keyword",  
                        "size" : 500 }
        }
    }}

Open Cygwin at a specific folder

@echo off
C:
SET mypath=%~dp0
c:\cygwin\bin\bash -c "cd '%mypath%'; export CHERE_INVOKING=1; exec /bin/bash --login -i"

Copy above commands in a text file and save it as .bat in any of "your folder of interest". It should open cygwin in "your folder of interest".

javax.naming.NoInitialContextException - Java

We need to specify the INITIAL_CONTEXT_FACTORY, PROVIDER_URL, USERNAME, PASSWORD etc. of JNDI to create an InitialContext.

In a standalone application, you can specify that as below

Hashtable env = new Hashtable();
env.put(Context.INITIAL_CONTEXT_FACTORY, 
    "com.sun.jndi.ldap.LdapCtxFactory");
env.put(Context.PROVIDER_URL, "ldap://ldap.wiz.com:389");
env.put(Context.SECURITY_PRINCIPAL, "joeuser");
env.put(Context.SECURITY_CREDENTIALS, "joepassword");

Context ctx = new InitialContext(env);

But if you are running your code in a Java EE container, these values will be fetched by the container and used to create an InitialContext as below

System.getProperty(Context.PROVIDER_URL);

and

these values will be set while starting the container as JVM arguments. So if you are running the code in a container, the following will work

InitialContext ctx = new InitialContext();

transform object to array with lodash

If you want some custom mapping (like original Array.prototype.map) of Object into an Array, you can just use _.forEach:

let myObject = {
  key1: "value1",
  key2: "value2",
  // ...
};

let myNewArray = [];

_.forEach(myObject, (value, key) => {
  myNewArray.push({
    someNewKey: key,
    someNewValue: value.toUpperCase() // just an example of new value based on original value
  });
});

// myNewArray => [{ someNewKey: key1, someNewValue: 'VALUE1' }, ... ];

See lodash doc of _.forEach https://lodash.com/docs/#forEach

Why doesn't Console.Writeline, Console.Write work in Visual Studio Express?

No satisfactory answers provided.

System.Diagnostics.Debug.WriteLine() will write messages to the Output:debug window, but so much crap is constantly dumped into that window by every process under the sun, it is like finding a needle in a haystack to find YOUR messages.

Console.WriteLine() does not write to any window in Visual Studio. I guess it will only write to the application console if your application creates a console in the first place, i.e. if it is a Console application.

Why is the tooling making the simple task of having your web application server side code .cs code write some debug messages into a window which is swamped with crap making it almost impossible to find your information?

Is it possible to disable the network in iOS Simulator?

You can throttle the internet connection with a 3rd party app such as

Charles: http://www.charlesproxy.com/

Hit command + shift + T on a Mac to setup the throttling.

Invalid column name sql error

You should never write code that concatenates SQL and parameters as string - this opens up your code to SQL injection which is a really serious security problem.

Use bind params - for a nice howto see here...

Swift convert unix time to date and time

Anyway @Nate Cook's answer is accepted but I would like to improve it with better date format.

with Swift 2.2, I can get desired formatted date

//TimeStamp
let timeInterval  = 1415639000.67457
print("time interval is \(timeInterval)")

//Convert to Date
let date = NSDate(timeIntervalSince1970: timeInterval)

//Date formatting
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "dd, MMMM yyyy HH:mm:a"
dateFormatter.timeZone = NSTimeZone(name: "UTC")
let dateString = dateFormatter.stringFromDate(date)
print("formatted date is =  \(dateString)")

the result is

time interval is 1415639000.67457

formatted date is = 10, November 2014 17:03:PM

Reading binary file and looping over each byte

If you have a lot of binary data to read, you might want to consider the struct module. It is documented as converting "between C and Python types", but of course, bytes are bytes, and whether those were created as C types does not matter. For example, if your binary data contains two 2-byte integers and one 4-byte integer, you can read them as follows (example taken from struct documentation):

>>> struct.unpack('hhl', b'\x00\x01\x00\x02\x00\x00\x00\x03')
(1, 2, 3)

You might find this more convenient, faster, or both, than explicitly looping over the content of a file.

Check if element is visible in DOM

All the other solutions broke for some situation for me..

See the winning answer breaking at:

http://plnkr.co/edit/6CSCA2fe4Gqt4jCBP2wu?p=preview

Eventually, I decided that the best solution was $(elem).is(':visible') - however, this is not pure javascript. it is jquery..

so I peeked at their source and found what I wanted

jQuery.expr.filters.visible = function( elem ) {
    return !!( elem.offsetWidth || elem.offsetHeight || elem.getClientRects().length );
};

This is the source: https://github.com/jquery/jquery/blob/master/src/css/hiddenVisibleSelectors.js

Text in HTML Field to disappear when clicked?

try this one out.

<label for="user">user</label>
<input type="text" name="user" 
onfocus="if(this.value==this.defaultValue)this.value=''"    
onblur="if(this.value=='')this.value=this.defaultValue" 
value="username" maxlength="19" />

hope this helps.

What's the best UI for entering date of birth?

If your goal is to make sure "the user won't be confused at all," I think this is the best option.

three dropdowns for month, day, year

I wouldn't recommend a datepicker for date of birth. First you have to browse to the year (click, click, click…), then to the month (click some more), and then find and click the tiny number on a grid.

Datepickers are useful when you don't know the exact date off the top of your head, e.g. you're planning a trip for the second week of February.

CSS property to pad text inside of div

Just use div { padding: 20px; } and substract 40px from your original div width.

Like Philip Wills pointed out, you can also use box-sizing instead of substracting 40px:

div {
    padding: 20px;
    -moz-box-sizing: border-box; 
    box-sizing: border-box;
}

The -moz-box-sizing is for Firefox.

How to submit form on change of dropdown list?

other than using this.form.submit() you also submiting by id or name. example i have form like this : <form action="" name="PostName" id="IdName">

  1. By Name : <select onchange="PostName.submit()">

  2. By Id : <select onchange="IdName.submit()">

CURL Command Line URL Parameters

Felipsmartins is correct.

It is worth mentioning that it is because you cannot really use the -d/--data option if this is not a POST request. But this is still possible if you use the -G option.

Which means you can do this:

curl -X DELETE -G 'http://localhost:5000/locations' -d 'id=3'

Here it is a bit silly but when you are on the command line and you have a lot of parameters, it is a lot tidier.

I am saying this because cURL commands are usually quite long, so it is worth making it on more than one line escaping the line breaks.

curl -X DELETE -G \
'http://localhost:5000/locations' \
-d id=3 \
-d name=Mario \
-d surname=Bros

This is obviously a lot more comfortable if you use zsh. I mean when you need to re-edit the previous command because zsh lets you go line by line. (just saying)

Hope it helps.

JavaScript variable assignments from tuples

As an update to The Minister's answer, you can now do this with es2015:

function Tuple(...args) {
  args.forEach((val, idx) => 
    Object.defineProperty(this, "item"+idx, { get: () => val })
  )
}


var t = new Tuple("a", 123)
console.log(t.item0) // "a"
t.item0 = "b"
console.log(t.item0) // "a"

https://jsbin.com/fubaluwimo/edit?js,console

How to display UTF-8 characters in phpMyAdmin?

ALTER TABLE table_name CONVERT to CHARACTER SET utf8;

*IMPORTANT: Back-up first, execute after

How to correctly display .csv files within Excel 2013?

I know that an answer has already been accepted, but one item to check is the encoding of the CSV file. I have a Powershell script that generates CSV files. By default, it was encoding them as UCS-2 Little Endian (per Notepad++). It would open the file in a single column in Excel and I'd have to do the Text to Columns conversion to split the columns. Changing the script to encode the same output as "ASCII" (UTF-8 w/o BOM per Notepad++) allowed me to open the CSV directly with the columns split out. You can change the encoding of the CSV in Notepad++ too.

  • Menu Encoding > Convert to UTF-8 without BOM
  • Save the CSV file
  • Open in Excel, columns should be split

bower proxy configuration

Inside your local project open the .bowerrc that contains:

{
   "directory": "bower_components"
 }

and add the following code-line:

{
   "directory": "bower_components",
  "proxy": "http://yourProxy:yourPort",
  "https-proxy":"http://yourProxy:yourPort"
}

bower version: 1.7.1

Cheers

How do I reference to another (open or closed) workbook, and pull values back, in VBA? - Excel 2007

You will have to open the file in one way or another if you want to access the data within it. Obviously, one way is to open it in your Excel application instance, e.g.:-

(untested code)

Dim wbk As Workbook
Set wbk = Workbooks.Open("C:\myworkbook.xls")

' now you can manipulate the data in the workbook anyway you want, e.g. '

Dim x As Variant
x = wbk.Worksheets("Sheet1").Range("A6").Value

Call wbk.Worksheets("Sheet2").Range("A1:G100").Copy
Call ThisWorbook.Worksheets("Target").Range("A1").PasteSpecial(xlPasteValues)
Application.CutCopyMode = False

' etc '

Call wbk.Close(False)

Another way to do it would be to use the Excel ADODB provider to open a connection to the file and then use SQL to select data from the sheet you want, but since you are anyway working from within Excel I don't believe there is any reason to do this rather than just open the workbook. Note that there are optional parameters for the Workbooks.Open() method to open the workbook as read-only, etc.

What is causing ERROR: there is no unique constraint matching given keys for referenced table?

when you do UNIQUE as a table level constraint as you have done then what your defining is a bit like a composite primary key see ddl constraints, here is an extract

"This specifies that the *combination* of values in the indicated columns is unique across the whole table, though any one of the columns need not be (and ordinarily isn't) unique."

this means that either field could possibly have a non unique value provided the combination is unique and this does not match your foreign key constraint.

most likely you want the constraint to be at column level. so rather then define them as table level constraints, 'append' UNIQUE to the end of the column definition like name VARCHAR(60) NOT NULL UNIQUE or specify indivdual table level constraints for each field.

What's the difference between getRequestURI and getPathInfo methods in HttpServletRequest?

getPathInfo() gives the extra path information after the URI, used to access your Servlet, where as getRequestURI() gives the complete URI.

I would have thought they would be different, given a Servlet must be configured with its own URI pattern in the first place; I don't think I've ever served a Servlet from root (/).

For example if Servlet 'Foo' is mapped to URI '/foo' then I would have thought the URI:

/foo/path/to/resource

Would result in:

RequestURI = /foo/path/to/resource

and

PathInfo = /path/to/resource

Display a angular variable in my html page

In your template, you have access to all the variables that are members of the current $scope. So, tobedone should be $scope.tobedone, and then you can display it with {{tobedone}}, or [[tobedone]] in your case.

What's your most controversial programming opinion?

You don't have to program everything

I'm getting tired that everything, but then everything needs to be stuffed in a program, like that is always faster. everything needs to be webbased, evrything needs to be done via a computer. Please, just use your pen and paper. it's faster and less maintenance.

Rendering a template variable as HTML

Use the autoescape to turn HTML escaping off:

{% autoescape off %}{{ message }}{% endautoescape %}

How can INSERT INTO a table 300 times within a loop in SQL?

I would prevent loops in general if i can, set approaches are much more efficient:

INSERT INTO tblFoo
  SELECT TOP (300) n = ROW_NUMBER()OVER (ORDER BY [object_id]) 
  FROM sys.all_objects ORDER BY n;

Demo

Generate a set or sequence without loops

Sorting by date & time in descending order?

Following Query works for me. Database Tabel t_sonde_results has domain d_date (datatype DATE) and d_time (datatype TIME) The intention is to query for last entry in t_sonde_results sorted by Date and Time

select * from (select * from (SELECT * FROM t_sonde_results WHERE d_user_name = 'kenis' and d_smartbox_id = 6 order by d_time asc) AS tmp order by d_date and d_time limit 1) as tmp1

In Jinja2, how do you test if a variable is undefined?

{% if variable is defined %} works to check if something is undefined.

You can get away with using {% if not var1 %} if you default your variables to False eg

class MainHandler(BaseHandler):
    def get(self):
        var1 = self.request.get('var1', False)

Iterate through object properties

The for...in loop represents each property in an object because it is just like a for loop. You defined propt in the for...in loop by doing:

    for(var propt in obj){
alert(propt + ': ' + obj[propt]);
}

A for...in loop iterates through the enumerable properties of an object. Whichever variable you define, or put in the for...in loop, changes each time it goes to the next property it iterates. The variable in the for...in loop iterates through the keys, but the value of it is the key's value. For example:

    for(var propt in obj) {
      console.log(propt);//logs name
      console.log(obj[propt]);//logs "Simon"
    }

You can see how the variable differs from the variable's value. In contrast, a for...of loop does the opposite.

I hope this helps.

What does this mean? "Parse error: syntax error, unexpected T_PAAMAYIM_NEKUDOTAYIM"

The error is down to an "inappropriate use" of the double colon operator:

return $cnf::getConfig($key);

as by using the :: you're attempting to call a static method of the class itself. In your example you want to call a non-static method on an instantiated object.

I think what you want is:

return $cnf->getConfig($key);

Why do I get an error instantiating an interface?

IUser is the interface, you can't instantiate the interface.

You need to instantiate the concrete class that implements the interface.

IUser user = new User();

or

User user = new User();

How do I clear the content of a div using JavaScript?

You can do it the DOM way as well:

var div = document.getElementById('cart_item');
while(div.firstChild){
    div.removeChild(div.firstChild);
}

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

None of the above solutions worked for me(running on a 64x machine).

Finally I clicked on 'advanced compiler settings' and UNCHECKED 'enable optimizations' and I can now step through code and edit while debugging.

How to initialize a List<T> to a given size (as opposed to capacity)?

Use the constructor which takes an int ("capacity") as an argument:

List<string> = new List<string>(10);

EDIT: I should add that I agree with Frederik. You are using the List in a way that goes against the entire reasoning behind using it in the first place.

EDIT2:

EDIT 2: What I'm currently writing is a base class offering default functionality as part of a bigger framework. In the default functionality I offer, the size of the List is known in advanced and therefore I could have used an array. However, I want to offer any base class the chance to dynamically extend it and therefore I opt for a list.

Why would anyone need to know the size of a List with all null values? If there are no real values in the list, I would expect the length to be 0. Anyhow, the fact that this is cludgy demonstrates that it is going against the intended use of the class.

Wireshark vs Firebug vs Fiddler - pros and cons?

The benefit of WireShark is that it could possibly show you errors in levels below the HTTP protocol. Fiddler will show you errors in the HTTP protocol.

If you think the problem is somewhere in the HTTP request issued by the browser, or you are just looking for more information in regards to what the server is responding with, or how long it is taking to respond, Fiddler should do.

If you suspect something may be wrong in the TCP/IP protocol used by your browser and the server (or in other layers below that), go with WireShark.

SQL Server: Invalid Column Name

Whenever this happens to me, I press Ctrl+Shift+R which refreshes intellisense, close the query window (save if necessary), then start a new session which usually works quite well.

Node.js - How to send data from html to express

I'd like to expand on Obertklep's answer. In his example it is an NPM module called body-parser which is doing most of the work. Where he puts req.body.name, I believe he/she is using body-parser to get the contents of the name attribute(s) received when the form is submitted.

If you do not want to use Express, use querystring which is a built-in Node module. See the answers in the link below for an example of how to use querystring.

It might help to look at this answer, which is very similar to your quest.

How do I make jQuery wait for an Ajax call to finish before it returns?

I think things would be easier if you code your success function to load the appropriate page instead of returning true or false.

For example instead of returning true you could do:

window.location="appropriate page";

That way when the success function is called the page gets redirected.

java: run a function after a specific number of seconds

ScheduledThreadPoolExecutor has this ability, but it's quite heavyweight.

Timer also has this ability but opens several thread even if used only once.

Here's a simple implementation with a test (signature close to Android's Handler.postDelayed()):

public class JavaUtil {
    public static void postDelayed(final Runnable runnable, final long delayMillis) {
        final long requested = System.currentTimeMillis();
        new Thread(new Runnable() {
            @Override
            public void run() {
                // The while is just to ignore interruption.
                while (true) {
                    try {
                        long leftToSleep = requested + delayMillis - System.currentTimeMillis();
                        if (leftToSleep > 0) {
                            Thread.sleep(leftToSleep);
                        }
                        break;
                    } catch (InterruptedException ignored) {
                    }
                }
                runnable.run();
            }
        }).start();
    }
}

Test:

@Test
public void testRunsOnlyOnce() throws InterruptedException {
    long delay = 100;
    int num = 0;
    final AtomicInteger numAtomic = new AtomicInteger(num);
    JavaUtil.postDelayed(new Runnable() {
        @Override
        public void run() {
            numAtomic.incrementAndGet();
        }
    }, delay);
    Assert.assertEquals(num, numAtomic.get());
    Thread.sleep(delay + 10);
    Assert.assertEquals(num + 1, numAtomic.get());
    Thread.sleep(delay * 2);
    Assert.assertEquals(num + 1, numAtomic.get());
}

Check if cookie exists else set cookie to Expire in 10 days

You need to read and write document.cookie

if (document.cookie.indexOf("visited=") >= 0) {
  // They've been here before.
  alert("hello again");
}
else {
  // set a new cookie
  expiry = new Date();
  expiry.setTime(expiry.getTime()+(10*60*1000)); // Ten minutes

  // Date()'s toGMTSting() method will format the date correctly for a cookie
  document.cookie = "visited=yes; expires=" + expiry.toGMTString();
  alert("this is your first time");
}

What's the difference between VARCHAR and CHAR?

CHAR is fixed length and VARCHAR is variable length. CHAR always uses the same amount of storage space per entry, while VARCHAR only uses the amount necessary to store the actual text.

Import and Export Excel - What is the best library?

How about the apache POI java library. I havent used it for Excel , but did use it for Word 2007.

Java replace all square brackets in a string

use regex [\\[\\]] -

String str = "[Chrissman-@1]";
String[] temp = str.replaceAll("[\\[\\]]", "").split("-@");
System.out.println("Nickname: " + temp[0] + " | Power: " + temp[1]);

output -

Nickname: Chrissman | Power: 1

Run ScrollTop with offset of element by ID

No magic involved, just subtract from the offset top of the element

$('html, body').animate({scrollTop: $('#contact').offset().top -100 }, 'slow');

bash: pip: command not found

I spent ages going through all the answers on this page but found the one that worked for me in the comments of the OP question by s-walsh

The answer is to use pip3:

$ pip3 install <name-of-install>

What's the difference between ViewData and ViewBag?

ViewBag and ViewData are two means which are used to pass information from controller to view in ASP.Net MVC. The goal of using both mechanism is to provide the communicaton between controller and View. Both have short life that is the value of both becomes null once the redirection has occured ie, once the page has redirected from the source page (where we set the value of ViewBag or ViewData) to the target page , both ViewBag as well as ViewData becomes null.

Despite having these similarities both (ViewBag and ViewData) are two different things if we talk about the implementation of both. The differences are as follows :

1.) If we analyse both implementation wise then we will find that ViewData is a dictionary data structure - Dictionary of Objects derived from ViewDataDictionary and accessible using strings as Keys to these values while ViewBag makes use of the dynamic features introduced in C#4.0 and is a dynamic property.

2.) While accessing the values form ViewData , we need to typecast the values (datatypes) as they are stored as Objects in the ViewData dictionary but there is no such need if we are accessing th value in case of ViewBag.

3.) In ViewBag we can set the value like this :

      ViewBag.Name = "Value"; 

and can access as follows:

          @ViewBag.Name

While in case of ViewData the values can be set and accessed as follows: Setting ViewData as follows :

ViewData["Name"] = "Value";

and accessing value like this

 @ViewData["Name"] 

For more details click here:

Python: pandas merge multiple dataframes

Look at this pandas three-way joining multiple dataframes on columns

filenames = ['fn1', 'fn2', 'fn3', 'fn4',....]
dfs = [pd.read_csv(filename, index_col=index_col) for filename in filenames)]
dfs[0].join(dfs[1:])

How to create a <style> tag with Javascript?

If the problem you're facing is injecting a string of CSS into a page it is easier to do this with the <link> element than the <style> element.

The following adds p { color: green; } rule to the page.

<link rel="stylesheet" type="text/css" href="data:text/css;charset=UTF-8,p%20%7B%20color%3A%20green%3B%20%7D" />

You can create this in JavaScript simply by URL encoding your string of CSS and adding it the HREF attribute. Much simpler than all the quirks of <style> elements or directly accessing stylesheets.

let linkElement: HTMLLinkElement = this.document.createElement('link');
linkElement.setAttribute('rel', 'stylesheet');
linkElement.setAttribute('type', 'text/css');
linkElement.setAttribute('href', 'data:text/css;charset=UTF-8,' + encodeURIComponent(myStringOfstyles));

This will work in IE 5.5 upwards

Adding null values to arraylist

You can add nulls to the ArrayList, and you will have to check for nulls in the loop:

for(Item i : itemList) {
   if (i != null) {

   }
}

itemsList.size(); would take the null into account.

 List<Integer> list = new ArrayList<Integer>();
 list.add(null);
 list.add (5);
 System.out.println (list.size());
 for (Integer value : list) {
   if (value == null)
       System.out.println ("null value");
   else 
       System.out.println (value);
 }

Output :

2
null value
5

Escape curly brace '{' in String.Format

Use double braces {{ or }} so your code becomes:

sb.AppendLine(String.Format("public {0} {1} {{ get; private set; }}", 
prop.Type, prop.Name));

// For prop.Type of "Foo" and prop.Name of "Bar", the result would be:
// public Foo Bar { get; private set; }

How do I return to an older version of our code in Subversion?

A bit more old-school

svn diff -r 150:140 > ../r140.patch
patch -p0 < ../r140.patch

then the usual

svn diff
svn commit

PHP 7: Missing VCRUNTIME140.dll

If you've followed Adam's instructions and you're still getting this error make sure you've installed the right variants (x86 or x64).

I had VC14x64 with PHP7x86 and I still got this error. Changing PHP7 to x64 fixed it. It's easy to miss you accidentally installed the wrong version.

Webclient / HttpWebRequest with Basic Authentication returns 404 not found for valid URL

If its working when you are using a browser and then passing on your username and password for the first time - then this means that once authentication is done Request header of your browser is set with required authentication values, which is then passed on each time a request is made to hosting server.

So start with inspecting Request Header (this could be done using Web Developers tools), Once you established whats required in header then you could pass this within your HttpWebRequest Header.

Example with Digest Authentication:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;
using System.Text.RegularExpressions;
using System.Net;
using System.IO;

namespace NUI
{
    public class DigestAuthFixer
    {
        private static string _host;
        private static string _user;
        private static string _password;
        private static string _realm;
        private static string _nonce;
        private static string _qop;
        private static string _cnonce;
        private static DateTime _cnonceDate;
        private static int _nc;

public DigestAuthFixer(string host, string user, string password)
{
    // TODO: Complete member initialization
    _host = host;
    _user = user;
    _password = password;
}

private string CalculateMd5Hash(
    string input)
{
    var inputBytes = Encoding.ASCII.GetBytes(input);
    var hash = MD5.Create().ComputeHash(inputBytes);
    var sb = new StringBuilder();
    foreach (var b in hash)
        sb.Append(b.ToString("x2"));
    return sb.ToString();
}

private string GrabHeaderVar(
    string varName,
    string header)
{
    var regHeader = new Regex(string.Format(@"{0}=""([^""]*)""", varName));
    var matchHeader = regHeader.Match(header);
    if (matchHeader.Success)
        return matchHeader.Groups[1].Value;
    throw new ApplicationException(string.Format("Header {0} not found", varName));
}

private string GetDigestHeader(
    string dir)
{
    _nc = _nc + 1;

    var ha1 = CalculateMd5Hash(string.Format("{0}:{1}:{2}", _user, _realm, _password));
    var ha2 = CalculateMd5Hash(string.Format("{0}:{1}", "GET", dir));
    var digestResponse =
        CalculateMd5Hash(string.Format("{0}:{1}:{2:00000000}:{3}:{4}:{5}", ha1, _nonce, _nc, _cnonce, _qop, ha2));

    return string.Format("Digest username=\"{0}\", realm=\"{1}\", nonce=\"{2}\", uri=\"{3}\", " +
        "algorithm=MD5, response=\"{4}\", qop={5}, nc={6:00000000}, cnonce=\"{7}\"",
        _user, _realm, _nonce, dir, digestResponse, _qop, _nc, _cnonce);
}

public string GrabResponse(
    string dir)
{
    var url = _host + dir;
    var uri = new Uri(url);

    var request = (HttpWebRequest)WebRequest.Create(uri);

    // If we've got a recent Auth header, re-use it!
    if (!string.IsNullOrEmpty(_cnonce) &&
        DateTime.Now.Subtract(_cnonceDate).TotalHours < 1.0)
    {
        request.Headers.Add("Authorization", GetDigestHeader(dir));
    }

    HttpWebResponse response;
    try
    {
        response = (HttpWebResponse)request.GetResponse();
    }
    catch (WebException ex)
    {
        // Try to fix a 401 exception by adding a Authorization header
        if (ex.Response == null || ((HttpWebResponse)ex.Response).StatusCode != HttpStatusCode.Unauthorized)
            throw;

        var wwwAuthenticateHeader = ex.Response.Headers["WWW-Authenticate"];
        _realm = GrabHeaderVar("realm", wwwAuthenticateHeader);
        _nonce = GrabHeaderVar("nonce", wwwAuthenticateHeader);
        _qop = GrabHeaderVar("qop", wwwAuthenticateHeader);

        _nc = 0;
        _cnonce = new Random().Next(123400, 9999999).ToString();
        _cnonceDate = DateTime.Now;

        var request2 = (HttpWebRequest)WebRequest.Create(uri);
        request2.Headers.Add("Authorization", GetDigestHeader(dir));
        response = (HttpWebResponse)request2.GetResponse();
    }
    var reader = new StreamReader(response.GetResponseStream());
    return reader.ReadToEnd();
}

}

Then you could call it:

DigestAuthFixer digest = new DigestAuthFixer(domain, username, password);
string strReturn = digest.GrabResponse(dir);

if Url is: http://xyz.rss.com/folder/rss then domain: http://xyz.rss.com (domain part) dir: /folder/rss (rest of the url)

you could also return it as stream and use XmlDocument Load() method.

Converting data frame column from character to numeric

If we need only one column to be numeric

yyz$b <- as.numeric(as.character(yyz$b))

But, if all the columns needs to changed to numeric, use lapply to loop over the columns and convert to numeric by first converting it to character class as the columns were factor.

yyz[] <- lapply(yyz, function(x) as.numeric(as.character(x)))

Both the columns in the OP's post are factor because of the string "n/a". This could be easily avoided while reading the file using na.strings = "n/a" in the read.table/read.csv or if we are using data.frame, we can have character columns with stringsAsFactors=FALSE (the default is stringsAsFactors=TRUE)


Regarding the usage of apply, it converts the dataset to matrix and matrix can hold only a single class. To check the class, we need

lapply(yyz, class)

Or

sapply(yyz, class)

Or check

str(yyz)

typeof !== "undefined" vs. != null

If the variable is declared (either with the var keyword, as a function argument, or as a global variable), I think the best way to do it is:

if (my_variable === undefined)

jQuery does it, so it's good enough for me :-)

Otherwise, you'll have to use typeof to avoid a ReferenceError.

If you expect undefined to be redefined, you could wrap your code like this:

(function(undefined){
    // undefined is now what it's supposed to be
})();

Or obtain it via the void operator:

const undefined = void 0;
// also safe

Windows Bat file optional argument parsing

Dynamic variables creation

enter image description here

Pros

  • Works for >9 arguments
  • Keeps %1, %2, ... %* in tact
  • Works for both /arg and -arg style
  • No prior knowledge about arguments
  • Implementation is separate from main routine

Cons

  • Old arguments may leak into consecutive runs, therefore use setlocal for local scoping or write an accompanying :CLEAR-ARGS routine!
  • No alias support yet (like --force to -f)
  • No empty "" argument support

Usage

Here is an example how the following arguments relate to .bat variables:

>> testargs.bat /b 3 -c /d /e /f /g /h /i /j /k /bar 5 /foo "c:\"

echo %*        | /b 3 -c /d /e /f /g /h /i /j /k /bar 5 /foo "c:\"
echo %ARG_FOO% | c:\
echo %ARG_A%   |
echo %ARG_B%   | 3
echo %ARG_C%   | 1
echo %ARG_D%   | 1

Implementation

@echo off
setlocal

CALL :ARG-PARSER %*

::Print examples
echo: ALL: %*
echo: FOO: %ARG_FOO%
echo: A:   %ARG_A%
echo: B:   %ARG_B%
echo: C:   %ARG_C%
echo: D:   %ARG_D%


::*********************************************************
:: Parse commandline arguments into sane variables
:: See the following scenario as usage example:
:: >> thisfile.bat /a /b "c:\" /c /foo 5
:: >> CALL :ARG-PARSER %*
:: ARG_a=1
:: ARG_b=c:\
:: ARG_c=1
:: ARG_foo=5
::*********************************************************
:ARG-PARSER
    ::Loop until two consecutive empty args
    :loopargs
        IF "%~1%~2" EQU "" GOTO :EOF

        set "arg1=%~1" 
        set "arg2=%~2"
        shift

        ::Allow either / or -
        set "tst1=%arg1:-=/%"
        if "%arg1%" NEQ "" (
            set "tst1=%tst1:~0,1%"
        ) ELSE (
            set "tst1="
        )

        set "tst2=%arg2:-=/%"
        if "%arg2%" NEQ "" (
            set "tst2=%tst2:~0,1%"
        ) ELSE (
            set "tst2="
        )


        ::Capture assignments (eg. /foo bar)
        IF "%tst1%" EQU "/"  IF "%tst2%" NEQ "/" IF "%tst2%" NEQ "" (
            set "ARG_%arg1:~1%=%arg2%"
            GOTO loopargs
        )

        ::Capture flags (eg. /foo)
        IF "%tst1%" EQU "/" (
            set "ARG_%arg1:~1%=1"
            GOTO loopargs
        )
    goto loopargs
GOTO :EOF

How to convert a string to number in TypeScript?

There are a lot of you are having a problem to convert data types are difficult to solve in the ionic programming situations, because this very language is new, here I will detail instructions for the user to know how to convert data ionic types to string data type integer.

In programming languages such as java, php, c, c++, ... all can move data easily, then in ionic can also create for us data conversion is also an easy way not least in other programming languages.

this.mPosition = parseInt("");

How to center div vertically inside of absolutely positioned parent div

Center vertically and horizontally:

.parent{
  height: 100%;
  position: absolute;
  width: 100%;
  top: 0;
  left: 0;
}
.c{
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  transform: translateY(-50%);
}

Sound alarm when code finishes

ubuntu speech dispatcher can be used:

import subprocess
subprocess.call(['speech-dispatcher'])        #start speech dispatcher
subprocess.call(['spd-say', '"your process has finished"'])

Round up to Second Decimal Place in Python

from math import ceil

num = 0.1111111111000
num = ceil(num * 100) / 100.0

See:
math.ceil documentation
round documentation - You'll probably want to check this out anyway for future reference

How to use foreach with a hash reference?

foreach my $key (keys %$ad_grp_ref) {
    ...
}

Perl::Critic and daxim recommend the style

foreach my $key (keys %{ $ad_grp_ref }) {
    ...
}

out of concerns for readability and maintenance (so that you don't need to think hard about what to change when you need to use %{ $ad_grp_obj[3]->get_ref() } instead of %{ $ad_grp_ref })

How do I filter ForeignKey choices in a Django ModelForm?

This is simple, and works with Django 1.4:

class ClientAdminForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        super(ClientAdminForm, self).__init__(*args, **kwargs)
        # access object through self.instance...
        self.fields['base_rate'].queryset = Rate.objects.filter(company=self.instance.company)

class ClientAdmin(admin.ModelAdmin):
    form = ClientAdminForm
    ....

You don't need to specify this in a form class, but can do it directly in the ModelAdmin, as Django already includes this built-in method on the ModelAdmin (from the docs):

ModelAdmin.formfield_for_foreignkey(self, db_field, request, **kwargs)¶
'''The formfield_for_foreignkey method on a ModelAdmin allows you to 
   override the default formfield for a foreign keys field. For example, 
   to return a subset of objects for this foreign key field based on the
   user:'''

class MyModelAdmin(admin.ModelAdmin):
    def formfield_for_foreignkey(self, db_field, request, **kwargs):
        if db_field.name == "car":
            kwargs["queryset"] = Car.objects.filter(owner=request.user)
        return super(MyModelAdmin, self).formfield_for_foreignkey(db_field, request, **kwargs)

An even niftier way to do this (for example in creating a front-end admin interface that users can access) is to subclass the ModelAdmin and then alter the methods below. The net result is a user interface that ONLY shows them content that is related to them, while allowing you (a super-user) to see everything.

I've overridden four methods, the first two make it impossible for a user to delete anything, and it also removes the delete buttons from the admin site.

The third override filters any query that contains a reference to (in the example 'user' or 'porcupine' (just as an illustration).

The last override filters any foreignkey field in the model to filter the choices available the same as the basic queryset.

In this way, you can present an easy to manage front-facing admin site that allows users to mess with their own objects, and you don't have to remember to type in the specific ModelAdmin filters we talked about above.

class FrontEndAdmin(models.ModelAdmin):
    def __init__(self, model, admin_site):
        self.model = model
        self.opts = model._meta
        self.admin_site = admin_site
        super(FrontEndAdmin, self).__init__(model, admin_site)

remove 'delete' buttons:

    def get_actions(self, request):
        actions = super(FrontEndAdmin, self).get_actions(request)
        if 'delete_selected' in actions:
            del actions['delete_selected']
        return actions

prevents delete permission

    def has_delete_permission(self, request, obj=None):
        return False

filters objects that can be viewed on the admin site:

    def get_queryset(self, request):
        if request.user.is_superuser:
            try:
                qs = self.model.objects.all()
            except AttributeError:
                qs = self.model._default_manager.get_queryset()
            return qs

        else:
            try:
                qs = self.model.objects.all()
            except AttributeError:
                qs = self.model._default_manager.get_queryset()

            if hasattr(self.model, ‘user’):
                return qs.filter(user=request.user)
            if hasattr(self.model, ‘porcupine’):
                return qs.filter(porcupine=request.user.porcupine)
            else:
                return qs

filters choices for all foreignkey fields on the admin site:

    def formfield_for_foreignkey(self, db_field, request, **kwargs):
        if request.employee.is_superuser:
            return super(FrontEndAdmin, self).formfield_for_foreignkey(db_field, request, **kwargs)

        else:
            if hasattr(db_field.rel.to, 'user'):
                kwargs["queryset"] = db_field.rel.to.objects.filter(user=request.user)
            if hasattr(db_field.rel.to, 'porcupine'):
                kwargs["queryset"] = db_field.rel.to.objects.filter(porcupine=request.user.porcupine)
            return super(ModelAdminFront, self).formfield_for_foreignkey(db_field, request, **kwargs)

performSelector may cause a leak because its selector is unknown

Here is an updated macro based on the answer given above. This one should allow you to wrap your code even with a return statement.

#define SUPPRESS_PERFORM_SELECTOR_LEAK_WARNING(code)                        \
    _Pragma("clang diagnostic push")                                        \
    _Pragma("clang diagnostic ignored \"-Warc-performSelector-leaks\"")     \
    code;                                                                   \
    _Pragma("clang diagnostic pop")                                         \


SUPPRESS_PERFORM_SELECTOR_LEAK_WARNING(
    return [_target performSelector:_action withObject:self]
);

find vs find_by vs where

Both #2s in your lists are being deprecated. You can still use find(params[:id]) though.

Generally, where() works in most situations.

Here's a great post: https://web.archive.org/web/20150206131559/http://m.onkey.org/active-record-query-interface

How to scroll HTML page to given anchor?

A pure javascript solution without JQuery. Tested on Chrome & I.e, not tested on IOS

function ScrollTo(name) {
  ScrollToResolver(document.getElementById(name));
}

function ScrollToResolver(elem) {
  var jump = parseInt(elem.getBoundingClientRect().top * .2);
  document.body.scrollTop += jump;
  document.documentElement.scrollTop += jump;
  if (!elem.lastjump || elem.lastjump > Math.abs(jump)) {
    elem.lastjump = Math.abs(jump);
    setTimeout(function() { ScrollToResolver(elem);}, "100");
  } else {
    elem.lastjump = null;
  }
}

demo: https://jsfiddle.net/jd7q25hg/12/

How to best display in Terminal a MySQL SELECT returning too many fields?

Using mysql's ego command

From mysql's help command:

ego          (\G) Send command to mysql server, display result vertically.

So by appending a \G to your select, you can get a very clean vertical output:

mysql> SELECT * FROM sometable \G

Using a pager

You can tell MySQL to use the less pager with its -S option that chops wide lines and gives you an output that you can scroll with the arrow keys:

mysql> pager less -S

Thus, next time you run a command with a wide output, MySQL will let you browse the output with the less pager:

mysql> SELECT * FROM sometable;

If you're done with the pager and want to go back to the regular output on stdout, use this:

mysql> nopager

Passing a callback function to another class

public class Class1
    {

        private void btn_click(object sender, EventArgs e)
        {
            ServerRequest sr = new ServerRequest();
            sr.Callback += new ServerRequest.CallbackEventHandler(sr_Callback);
            sr.DoRequest("myrequest");
        }

        void sr_Callback(string something)
        {

        }


    }

    public class ServerRequest
    {
        public delegate void CallbackEventHandler(string something);
        public event CallbackEventHandler Callback;   

        public void DoRequest(string request)
        {
            // do stuff....
            if (Callback != null)
                Callback("bla");
        }
    }

JavaScript string newline character?

I've just tested a few browsers using this silly bit of JavaScript:

_x000D_
_x000D_
function log_newline(msg, test_value) {_x000D_
  if (!test_value) { _x000D_
    test_value = document.getElementById('test').value;_x000D_
  }_x000D_
  console.log(msg + ': ' + (test_value.match(/\r/) ? 'CR' : '')_x000D_
              + ' ' + (test_value.match(/\n/) ? 'LF' : ''));_x000D_
}_x000D_
_x000D_
log_newline('HTML source');_x000D_
log_newline('JS string', "foo\nbar");_x000D_
log_newline('JS template literal', `bar_x000D_
baz`);
_x000D_
<textarea id="test" name="test">_x000D_
_x000D_
</textarea>
_x000D_
_x000D_
_x000D_

IE8 and Opera 9 on Windows use \r\n. All the other browsers I tested (Safari 4 and Firefox 3.5 on Windows, and Firefox 3.0 on Linux) use \n. They can all handle \n just fine when setting the value, though IE and Opera will convert that back to \r\n again internally. There's a SitePoint article with some more details called Line endings in Javascript.

Note also that this is independent of the actual line endings in the HTML file itself (both \n and \r\n give the same results).

When submitting a form, all browsers canonicalize newlines to %0D%0A in URL encoding. To see that, load e.g. data:text/html,<form><textarea name="foo">foo%0abar</textarea><input type="submit"></form> and press the submit button. (Some browsers block the load of the submitted page, but you can see the URL-encoded form values in the console.)

I don't think you really need to do much of any determining, though. If you just want to split the text on newlines, you could do something like this:

lines = foo.value.split(/\r\n|\r|\n/g);

How to add style from code behind?

Try this:

Html Markup

<asp:HyperLink ID="HyperLink1" runat="server" NavigateUrl="#">HyperLink</asp:HyperLink>

Code

using System.Drawing;
using System.Web.UI;
using System.Web.UI.WebControls;

protected void Page_Load(object sender, EventArgs e)
{
    Style style = new Style();
    style.ForeColor = Color.Green;
    this.Page.Header.StyleSheet.CreateStyleRule(style, this, "#" + HyperLink1.ClientID + ":hover");
}

Add a CSS class to <%= f.submit %>

both of them works <%= f.submit class: "btn btn-primary" %> and <%= f.submit "Name of Button", class: "btn btn-primary "%>

jQuery check if Cookie exists, if not create it

I think the bulletproof way is:

if (typeof $.cookie('token') === 'undefined'){
 //no cookie
} else {
 //have cookie
}

Checking the type of a null, empty or undefined var always returns 'undefined'

Edit: You can get there even easier:

if (!!$.cookie('token')) {
 // have cookie
} else {
 // no cookie
}

!! will turn the falsy values to false. Bear in mind that this will turn 0 to false!

How do you check current view controller class in Swift?

My suggestion is a variation on Kiran's answer above. I used this in a project.

Swift 5

// convenience property API on my class object to provide access to the my WindowController (MyController).
var myXWindowController: MyController? {

    var myWC: MyController?                
    for viewController in self.windowControllers {
        if ((viewController as? MyController) != nil) {
            myWC = viewController as? MyController
            break
        }
    }

    return myWC
}

// example of use
guard let myController = myXWindowController else {
    reportAssertionFailure("Failed to get MyXController from WindowController.")
    return
}  

Getting IPV4 address from a sockaddr structure

You can use getnameinfo for Windows and for Linux.

Assuming you have a good (i.e. it's members have appropriate values) sockaddr* called pSockaddr:

char clienthost[NI_MAXHOST];  //The clienthost will hold the IP address.
char clientservice[NI_MAXSERV];
int theErrorCode = getnameinfo(pSockaddr, sizeof(*pSockaddr), clienthost, sizeof(clienthost), clientservice, sizeof(clientservice), NI_NUMERICHOST|NI_NUMERICSERV);

if( theErrorCode != 0 )
{
    //There was an error.
    cout << gai_strerror(e1) << endl;
}else{
    //Print the info.
    cout << "The ip address is = " << clienthost << endl;
    cout << "The clientservice = " << clientservice << endl;
}

Remove all special characters from a string

This should do what you're looking for:

function clean($string) {
   $string = str_replace(' ', '-', $string); // Replaces all spaces with hyphens.

   return preg_replace('/[^A-Za-z0-9\-]/', '', $string); // Removes special chars.
}

Usage:

echo clean('a|"bc!@£de^&$f g');

Will output: abcdef-g

Edit:

Hey, just a quick question, how can I prevent multiple hyphens from being next to each other? and have them replaced with just 1?

function clean($string) {
   $string = str_replace(' ', '-', $string); // Replaces all spaces with hyphens.
   $string = preg_replace('/[^A-Za-z0-9\-]/', '', $string); // Removes special chars.

   return preg_replace('/-+/', '-', $string); // Replaces multiple hyphens with single one.
}

Python check if website exists

It's better to check that status code is < 400, like it was done here. Here is what do status codes mean (taken from wikipedia):

  • 1xx - informational
  • 2xx - success
  • 3xx - redirection
  • 4xx - client error
  • 5xx - server error

If you want to check if page exists and don't want to download the whole page, you should use Head Request:

import httplib2
h = httplib2.Http()
resp = h.request("http://www.google.com", 'HEAD')
assert int(resp[0]['status']) < 400

taken from this answer.

If you want to download the whole page, just make a normal request and check the status code. Example using requests:

import requests

response = requests.get('http://google.com')
assert response.status_code < 400

See also similar topics:

Hope that helps.

Windows Batch: How to add Host-Entries?

Well I write a script which works very well.

> @echo off TITLE Modifying your HOSTS file COLOR F0 ECHO.
> 
> :LOOP SET Choice= SET /P Choice="Do you want to modify HOSTS file ?
> (Y/N)"
> 
> IF NOT '%Choice%'=='' SET Choice=%Choice:~0,1%
> 
> ECHO. IF /I '%Choice%'=='Y' GOTO ACCEPTED IF /I '%Choice%'=='N' GOTO
> REJECTED ECHO Please type Y (for Yes) or N (for No) to proceed! ECHO.
> GOTO Loop
> 
> 
> :REJECTED ECHO Your HOSTS file was left
> unchanged>>%systemroot%\Temp\hostFileUpdate.log ECHO Finished. GOTO
> END
> 
> 
> :ACCEPTED SET NEWLINE=^& echo. ECHO Carrying out requested
> modifications to your HOSTS file FIND /C /I "www.youtube.com"
> %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL% NEQ 0 ECHO
> %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL% NEQ 0
> ECHO 127.0.0.1    www.youtube.com>>%WINDIR%\system32\drivers\etc\hosts
> FIND /C /I "youtube.com" %WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts
> IF %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> youtube.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "www.zacebookpk.com" %WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts
> IF %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> www.zacebookpk.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "zacebookpk.com" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> zacebookpk.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "www.proxysite.com" %WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts
> IF %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> www.proxysite.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "www.proxfree.com" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> www.proxfree.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "www.hidemyass.com" %WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts
> IF %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> www.hidemyass.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "www.freeyoutubeproxy.org" %WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts
> IF %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> www.freeyoutubeproxy.org>>%WINDIR%\system32\drivers\etc\hosts FIND /C
> /I "www.facebook.com" %WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts
> IF %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> www.facebook.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "facebook.com" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL% NEQ
> 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO 127.0.0.1   
> facebook.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "www.4everproxy.com " %WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts
> IF %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1    www.4everproxy.com
> >>%WINDIR%\system32\drivers\etc\hosts FIND /C /I "4everproxy.com " %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL% NEQ 0 ECHO
> %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL% NEQ 0
> ECHO 127.0.0.1    4everproxy.com >>%WINDIR%\system32\drivers\etc\hosts
> FIND /C /I "proxysite.com" %WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts
> IF %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> proxysite.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "proxfree.com" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL% NEQ
> 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO 127.0.0.1   
> proxfree.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "hidemyass.com" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> hidemyass.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "freeyoutubeproxy.org" %WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts
> IF %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> freeyoutubeproxy.org>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "unblockvideos.com" %WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts
> IF %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> unblockvideos.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "proxyone.net" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL% NEQ
> 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO 127.0.0.1   
> proxyone.net>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "kuvia.eu" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL% NEQ 0
> ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO 127.0.0.1    kuvia.eu>>%WINDIR%\system32\drivers\etc\hosts
> FIND /C /I "kuvia.eu/facebook-proxy"
> %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL% NEQ 0 ECHO
> %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL% NEQ 0
> ECHO 127.0.0.1   
> kuvia.eu/facebook-proxy>>%WINDIR%\system32\drivers\etc\hosts FIND /C
> /I "hidemytraxproxy.ca" %WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts
> IF %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> hidemytraxproxy.ca>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "github.com" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL% NEQ 0
> ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO 127.0.0.1   
> github.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "funproxy.net" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL% NEQ
> 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO 127.0.0.1   
> funproxy.net>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "en.wikipedia.org" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> en.wikipedia.org>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "wikipedia.org" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> wikipedia.org>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "dronten.proxylistpro.com" %WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts
> IF %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> dronten.proxylistpro.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C
> /I "proxylistpro.com" %WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts
> IF %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> proxylistpro.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "zfreez.com" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL% NEQ 0
> ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO 127.0.0.1   
> zfreez.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "zendproxy.com" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> zendproxy.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "zalmos.com" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL% NEQ 0
> ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO 127.0.0.1   
> zalmos.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "zacebookpk.com" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> zacebookpk.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "youtubeunblockproxy.com" %WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts
> IF %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> youtubeunblockproxy.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C
> /I "youtubefreeproxy.net" %WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts
> IF %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> youtubefreeproxy.net>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "youliaoren.com" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> youliaoren.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "xitenow.com" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL% NEQ
> 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO 127.0.0.1   
> xitenow.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "www.youtubeproxy.pk" %WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts
> IF %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> www.youtubeproxy.pk>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "youtubeproxy.pk" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> youtubeproxy.pk>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "www.youproxytube.com" %WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts
> IF %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> www.youproxytube.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "www.webmasterview.com" %WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts
> IF %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> www.webmasterview.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "webmasterview.com" %WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts
> IF %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> webmasterview.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "youproxytube.com" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> youproxytube.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "www.vobas.com" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> www.vobas.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "vobas.com" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL% NEQ 0
> ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO 127.0.0.1    vobas.com>>%WINDIR%\system32\drivers\etc\hosts
> FIND /C /I "www.unblockmyweb.com" %WINDIR%\system32\drivers\etc\hosts
> IF %ERRORLEVEL% NEQ 0 ECHO
> %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL% NEQ 0
> ECHO 127.0.0.1   
> www.unblockmyweb.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "unblockmyweb.com" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> unblockmyweb.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "www.unblocker.yt" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> www.unblocker.yt>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "unblocker.yt" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL% NEQ
> 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO 127.0.0.1   
> unblocker.yt>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "www.unblock.pk" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> www.unblock.pk>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "unblock.pk" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL% NEQ 0
> ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO 127.0.0.1   
> unblock.pk>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "www.techgyd.com" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> www.techgyd.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "techgyd.com" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL% NEQ
> 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO 127.0.0.1   
> techgyd.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "www.snapdeal.com" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> www.snapdeal.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "snapdeal.com" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL% NEQ
> 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO 127.0.0.1   
> snapdeal.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "www.site2unblock.com" %WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts
> IF %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> www.site2unblock.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "site2unblock.com" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> site2unblock.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "www.shopclues.com" %WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts
> IF %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> www.shopclues.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "shopclues.com" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> shopclues.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "www.proxypk.com" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> www.proxypk.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "proxypk.com" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL% NEQ
> 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO 127.0.0.1   
> proxypk.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "www.proxay.co.uk" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> www.proxay.co.uk>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "proxay.co.uk" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL% NEQ
> 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO 127.0.0.1   
> proxay.co.uk>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "www.myntra.com" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> www.myntra.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "myntra.com" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL% NEQ 0
> ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO 127.0.0.1   
> myntra.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "www.maddw.com" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> www.maddw.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "maddw.com" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL% NEQ 0
> ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO 127.0.0.1    maddw.com>>%WINDIR%\system32\drivers\etc\hosts
> FIND /C /I "www.lenskart.com" %WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts
> IF %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> www.lenskart.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "lenskart.com" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL% NEQ
> 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO 127.0.0.1   
> lenskart.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "www.kproxy.com" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> www.kproxy.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "kproxy.com" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL% NEQ 0
> ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO 127.0.0.1   
> kproxy.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "www.jabong.com" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> www.jabong.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "jabong.com" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL% NEQ 0
> ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO 127.0.0.1   
> jabong.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "www.flipkart.com" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> www.flipkart.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "flipkart.com" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL% NEQ
> 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO 127.0.0.1   
> flipkart.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "www.facebook-proxyserver.com" %WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts
> IF %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> www.facebook-proxyserver.com>>%WINDIR%\system32\drivers\etc\hosts FIND
> /C /I "facebook-proxyserver.com" %WINDIR%\system32\drivers\etc\hosts
> IF %ERRORLEVEL% NEQ 0 ECHO
> %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL% NEQ 0
> ECHO 127.0.0.1   
> facebook-proxyserver.com>>%WINDIR%\system32\drivers\etc\hosts FIND /C
> /I "www.dontfilter.us" %WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts
> IF %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> www.dontfilter.us>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "dontfilter.us" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> dontfilter.us>>%WINDIR%\system32\drivers\etc\hosts FIND /C /I
> "www.dolopo.net" %WINDIR%\system32\drivers\etc\hosts IF %ERRORLEVEL%
> NEQ 0 ECHO %NEWLINE%>>%WINDIR%\system32\drivers\etc\hosts IF
> %ERRORLEVEL% NEQ 0 ECHO 127.0.0.1   
> www.dolopo.net>>%WINDIR%\system32\drivers\etc\hosts ECHO Finished GOTO
> END
> 
> 
> :END ECHO. ping -n 11 127.0.0.1 > nul EXIT

global variable for all controller and views

In file - \vendor\autoload.php, define your gobals variable as follows, should be in the topmost line.

$global_variable = "Some value";//the global variable

Access that global variable anywhere as :-

$GLOBALS['global_variable'];

Enjoy :)

How do you get the length of a list in the JSF expression language?

You can eventually extend the EL language by using the EL Functor, which will allow you to call any Java beans methods, even with parameters...

What's the difference between deadlock and livelock?

Maybe these two examples illustrate you the difference between a deadlock and a livelock:


Java-Example for a deadlock:

import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

public class DeadlockSample {

    private static final Lock lock1 = new ReentrantLock(true);
    private static final Lock lock2 = new ReentrantLock(true);

    public static void main(String[] args) {
        Thread threadA = new Thread(DeadlockSample::doA,"Thread A");
        Thread threadB = new Thread(DeadlockSample::doB,"Thread B");
        threadA.start();
        threadB.start();
    }

    public static void doA() {
        System.out.println(Thread.currentThread().getName() + " : waits for lock 1");
        lock1.lock();
        System.out.println(Thread.currentThread().getName() + " : holds lock 1");

        try {
            System.out.println(Thread.currentThread().getName() + " : waits for lock 2");
            lock2.lock();
            System.out.println(Thread.currentThread().getName() + " : holds lock 2");

            try {
                System.out.println(Thread.currentThread().getName() + " : critical section of doA()");
            } finally {
                lock2.unlock();
                System.out.println(Thread.currentThread().getName() + " : does not hold lock 2 any longer");
            }
        } finally {
            lock1.unlock();
            System.out.println(Thread.currentThread().getName() + " : does not hold lock 1 any longer");
        }
    }

    public static void doB() {
        System.out.println(Thread.currentThread().getName() + " : waits for lock 2");
        lock2.lock();
        System.out.println(Thread.currentThread().getName() + " : holds lock 2");

        try {
            System.out.println(Thread.currentThread().getName() + " : waits for lock 1");
            lock1.lock();
            System.out.println(Thread.currentThread().getName() + " : holds lock 1");

            try {
                System.out.println(Thread.currentThread().getName() + " : critical section of doB()");
            } finally {
                lock1.unlock();
                System.out.println(Thread.currentThread().getName() + " : does not hold lock 1 any longer");
            }
        } finally {
            lock2.unlock();
            System.out.println(Thread.currentThread().getName() + " : does not hold lock 2 any longer");
        }
    }
}

Sample output:

Thread A : waits for lock 1
Thread B : waits for lock 2
Thread A : holds lock 1
Thread B : holds lock 2
Thread B : waits for lock 1
Thread A : waits for lock 2

Java-Example for a livelock:


import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

public class LivelockSample {

    private static final Lock lock1 = new ReentrantLock(true);
    private static final Lock lock2 = new ReentrantLock(true);

    public static void main(String[] args) {
        Thread threadA = new Thread(LivelockSample::doA, "Thread A");
        Thread threadB = new Thread(LivelockSample::doB, "Thread B");
        threadA.start();
        threadB.start();
    }

    public static void doA() {
        try {
            while (!lock1.tryLock()) {
                System.out.println(Thread.currentThread().getName() + " : waits for lock 1");
                Thread.sleep(100);
            }
            System.out.println(Thread.currentThread().getName() + " : holds lock 1");

            try {
                while (!lock2.tryLock()) {
                    System.out.println(Thread.currentThread().getName() + " : waits for lock 2");
                    Thread.sleep(100);
                }
                System.out.println(Thread.currentThread().getName() + " : holds lock 2");

                try {
                    System.out.println(Thread.currentThread().getName() + " : critical section of doA()");
                } finally {
                    lock2.unlock();
                    System.out.println(Thread.currentThread().getName() + " : does not hold lock 2 any longer");
                }
            } finally {
                lock1.unlock();
                System.out.println(Thread.currentThread().getName() + " : does not hold lock 1 any longer");
            }
        } catch (InterruptedException e) {
            // can be ignored here for this sample
        }
    }

    public static void doB() {
        try {
            while (!lock2.tryLock()) {
                System.out.println(Thread.currentThread().getName() + " : waits for lock 2");
                Thread.sleep(100);
            }
            System.out.println(Thread.currentThread().getName() + " : holds lock 2");

            try {
                while (!lock1.tryLock()) {
                    System.out.println(Thread.currentThread().getName() + " : waits for lock 1");
                    Thread.sleep(100);
                }
                System.out.println(Thread.currentThread().getName() + " : holds lock 1");

                try {
                    System.out.println(Thread.currentThread().getName() + " : critical section of doB()");
                } finally {
                    lock1.unlock();
                    System.out.println(Thread.currentThread().getName() + " : does not hold lock 1 any longer");
                }
            } finally {
                lock2.unlock();
                System.out.println(Thread.currentThread().getName() + " : does not hold lock 2 any longer");
            }
        } catch (InterruptedException e) {
            // can be ignored here for this sample
        }
    }
}

Sample output:

Thread B : holds lock 2
Thread A : holds lock 1
Thread A : waits for lock 2
Thread B : waits for lock 1
Thread B : waits for lock 1
Thread A : waits for lock 2
Thread A : waits for lock 2
Thread B : waits for lock 1
Thread B : waits for lock 1
Thread A : waits for lock 2
Thread A : waits for lock 2
Thread B : waits for lock 1
...

Both examples force the threads to aquire the locks in different orders. While the deadlock waits for the other lock, the livelock does not really wait - it desperately tries to acquire the lock without the chance of getting it. Every try consumes CPU cycles.

How to my "exe" from PyCharm project

You cannot directly save a Python file as an exe and expect it to work -- the computer cannot automatically understand whatever code you happened to type in a text file. Instead, you need to use another program to transform your Python code into an exe.

I recommend using a program like Pyinstaller. It essentially takes the Python interpreter and bundles it with your script to turn it into a standalone exe that can be run on arbitrary computers that don't have Python installed (typically Windows computers, since Linux tends to come pre-installed with Python).

To install it, you can either download it from the linked website or use the command:

pip install pyinstaller

...from the command line. Then, for the most part, you simply navigate to the folder containing your source code via the command line and run:

pyinstaller myscript.py

You can find more information about how to use Pyinstaller and customize the build process via the documentation.


You don't necessarily have to use Pyinstaller, though. Here's a comparison of different programs that can be used to turn your Python code into an executable.

CodeIgniter 404 Page Not Found, but why?

You could try one of two things or a combination of both.

  1. Be sure that your controller's name starts with a capital letter. eg "Mycontroller.php"
  2. If you have not made any changes to your route, for some strange reason, you might have to include capital letters in your url. e.g if your controller is 'Mycontroller.php' with a function named 'testfunc' inside it, then your url will look like this: "http://www.yourdomain/index.php/Mycontroller/testfunc". Note the capital letter. (I'm assuming you haven't added the htaccess file to remove the 'index.php' part. If you have, just remove it from the url.)

I hope this helps someone

How can I scale an image in a CSS sprite

When you use sprites, you are limited to the dimensions of the image in the sprite. The background-size CSS property, mentioned by Stephen, isn't widely supported yet and might cause problems with browsers like IE8 and below - and given their market share, this isn't a viable option.

Another way to solve the problem is to use two elements and scale the sprite by using it with an img tag, like this:

<div class="sprite-image"
     style="width:20px; height:20px; overflow:hidden; position:relative">
    <!-- set width/height proportionally, to scale the sprite image -->
    <img src="sprite.png" alt="icon"
         width="20" height="80"
         style="position:absolute; top: -20px; left: 0;" />
</div>

This way, the outer element (div.sprite-image) is cropping a 20x20px image from the img tag, which acts like a scaled background-image.

How to use ArgumentCaptor for stubbing?

Hypothetically, if search landed you on this question then you probably want this:

doReturn(someReturn).when(someObject).doSomething(argThat(argument -> argument.getName().equals("Bob")));

Why? Because like me you value time and you are not going to implement .equals just for the sake of the single test scenario.

And 99 % of tests fall apart with null returned from Mock and in a reasonable design you would avoid return null at all costs, use Optional or move to Kotlin. This implies that verify does not need to be used that often and ArgumentCaptors are just too tedious to write.

*.h or *.hpp for your class definitions

I use .hpp because I want the user to differentiate what headers are C++ headers, and what headers are C headers.

This can be important when your project is using both C and C++ modules: Like someone else explained before me, you should do it very carefully, and its starts by the "contract" you offer through the extension

.hpp : C++ Headers

(Or .hxx, or .hh, or whatever)

This header is for C++ only.

If you're in a C module, don't even try to include it. You won't like it, because no effort is done to make it C-friendly (too much would be lost, like function overloading, namespaces, etc. etc.).

.h : C/C++ compatible or pure C Headers

This header can be included by both a C source, and a C++ source, directly or indirectly.

It can included directly, being protected by the __cplusplus macro:

  • Which mean that, from a C++ viewpoint, the C-compatible code will be defined as extern "C".
  • From a C viewpoint, all the C code will be plainly visible, but the C++ code will be hidden (because it won't compile in a C compiler).

For example:

#ifndef MY_HEADER_H
#define MY_HEADER_H

   #ifdef __cplusplus
      extern "C"
      {
   #endif

   void myCFunction() ;

   #ifdef __cplusplus
      } // extern "C"
   #endif

#endif // MY_HEADER_H

Or it could be included indirectly by the corresponding .hpp header enclosing it with the extern "C" declaration.

For example:

#ifndef MY_HEADER_HPP
#define MY_HEADER_HPP

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

#endif // MY_HEADER_HPP

and:

#ifndef MY_HEADER_H
#define MY_HEADER_H

void myCFunction() ;

#endif // MY_HEADER_H

Meaning of "487 Request Terminated"

The 487 Response indicates that the previous request was terminated by user/application action. The most common occurrence is when the CANCEL happens as explained above. But it is also not limited to CANCEL. There are other cases where such responses can be relevant. So it depends on where you are seeing this behavior and whether its a user or application action that caused it.

15.1.2 UAS Behavior==> BYE Handling in RFC 3261

The UAS MUST still respond to any pending requests received for that dialog. It is RECOMMENDED that a 487 (Request Terminated) response be generated to those pending requests.

Downloading a Google font and setting up an offline site that uses it

If you'd like to explicitly declare your package dependencies or automate the download, you can add a node package to pull in google fonts and serve locally.

npm - Google Font Downloads

The typefaces project creates NPM packages for Open Source typefaces :

Each package ships with all the necessary fons and css to self-host an open source typeface.
All Google Fonts have been added as well as a small but growing list of other open source fonts.

Just search npm for typeface-<typefacename> to browse the available fonts like typeface-roboto or typeface-open-sans and install like this:

$ npm install typeface-roboto    --save 
$ npm install typeface-open-sans --save 
$ npm install material-icons     --save 

npm - Google Fonts Download-ers

For the more generic use case, there are several npm packages that will deliver fonts in two steps, first by obtaining the package, and then by pointing it to the font name and options you'd like to include.

Here are some of the options:

Further Reading:

int to string in MySQL

Try it using CONCAT

CONCAT('site.com/path/','%', CAST(t1.id AS CHAR(25)), '%','/more')

jQuery Uncaught TypeError: Property '$' of object [object Window] is not a function

This is a syntax issue, the jQuery library included with WordPress loads in "no conflict" mode. This is to prevent compatibility problems with other javascript libraries that WordPress can load. In "no-confict" mode, the $ shortcut is not available and the longer jQuery is used, i.e.

jQuery(document).ready(function ($) {

By including the $ in parenthesis after the function call you can then use this shortcut within the code block.

For full details see WordPress Codex

Getting the HTTP Referrer in ASP.NET

Use the Request.UrlReferrer property.

Underneath the scenes it is just checking the ServerVariables("HTTP_REFERER") property.

How Spring Security Filter Chain works

The Spring security filter chain is a very complex and flexible engine.

Key filters in the chain are (in the order)

  • SecurityContextPersistenceFilter (restores Authentication from JSESSIONID)
  • UsernamePasswordAuthenticationFilter (performs authentication)
  • ExceptionTranslationFilter (catch security exceptions from FilterSecurityInterceptor)
  • FilterSecurityInterceptor (may throw authentication and authorization exceptions)

Looking at the current stable release 4.2.1 documentation, section 13.3 Filter Ordering you could see the whole filter chain's filter organization:

13.3 Filter Ordering

The order that filters are defined in the chain is very important. Irrespective of which filters you are actually using, the order should be as follows:

  1. ChannelProcessingFilter, because it might need to redirect to a different protocol

  2. SecurityContextPersistenceFilter, so a SecurityContext can be set up in the SecurityContextHolder at the beginning of a web request, and any changes to the SecurityContext can be copied to the HttpSession when the web request ends (ready for use with the next web request)

  3. ConcurrentSessionFilter, because it uses the SecurityContextHolder functionality and needs to update the SessionRegistry to reflect ongoing requests from the principal

  4. Authentication processing mechanisms - UsernamePasswordAuthenticationFilter, CasAuthenticationFilter, BasicAuthenticationFilter etc - so that the SecurityContextHolder can be modified to contain a valid Authentication request token

  5. The SecurityContextHolderAwareRequestFilter, if you are using it to install a Spring Security aware HttpServletRequestWrapper into your servlet container

  6. The JaasApiIntegrationFilter, if a JaasAuthenticationToken is in the SecurityContextHolder this will process the FilterChain as the Subject in the JaasAuthenticationToken

  7. RememberMeAuthenticationFilter, so that if no earlier authentication processing mechanism updated the SecurityContextHolder, and the request presents a cookie that enables remember-me services to take place, a suitable remembered Authentication object will be put there

  8. AnonymousAuthenticationFilter, so that if no earlier authentication processing mechanism updated the SecurityContextHolder, an anonymous Authentication object will be put there

  9. ExceptionTranslationFilter, to catch any Spring Security exceptions so that either an HTTP error response can be returned or an appropriate AuthenticationEntryPoint can be launched

  10. FilterSecurityInterceptor, to protect web URIs and raise exceptions when access is denied

Now, I'll try to go on by your questions one by one:

I'm confused how these filters are used. Is it that for the spring provided form-login, UsernamePasswordAuthenticationFilter is only used for /login, and latter filters are not? Does the form-login namespace element auto-configure these filters? Does every request (authenticated or not) reach FilterSecurityInterceptor for non-login url?

Once you are configuring a <security-http> section, for each one you must at least provide one authentication mechanism. This must be one of the filters which match group 4 in the 13.3 Filter Ordering section from the Spring Security documentation I've just referenced.

This is the minimum valid security:http element which can be configured:

<security:http authentication-manager-ref="mainAuthenticationManager" 
               entry-point-ref="serviceAccessDeniedHandler">
    <security:intercept-url pattern="/sectest/zone1/**" access="hasRole('ROLE_ADMIN')"/>
</security:http>

Just doing it, these filters are configured in the filter chain proxy:

{
        "1": "org.springframework.security.web.context.SecurityContextPersistenceFilter",
        "2": "org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter",
        "3": "org.springframework.security.web.header.HeaderWriterFilter",
        "4": "org.springframework.security.web.csrf.CsrfFilter",
        "5": "org.springframework.security.web.savedrequest.RequestCacheAwareFilter",
        "6": "org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter",
        "7": "org.springframework.security.web.authentication.AnonymousAuthenticationFilter",
        "8": "org.springframework.security.web.session.SessionManagementFilter",
        "9": "org.springframework.security.web.access.ExceptionTranslationFilter",
        "10": "org.springframework.security.web.access.intercept.FilterSecurityInterceptor"
    }

Note: I get them by creating a simple RestController which @Autowires the FilterChainProxy and returns it's contents:

    @Autowired
    private FilterChainProxy filterChainProxy;

    @Override
    @RequestMapping("/filterChain")
    public @ResponseBody Map<Integer, Map<Integer, String>> getSecurityFilterChainProxy(){
        return this.getSecurityFilterChainProxy();
    }

    public Map<Integer, Map<Integer, String>> getSecurityFilterChainProxy(){
        Map<Integer, Map<Integer, String>> filterChains= new HashMap<Integer, Map<Integer, String>>();
        int i = 1;
        for(SecurityFilterChain secfc :  this.filterChainProxy.getFilterChains()){
            //filters.put(i++, secfc.getClass().getName());
            Map<Integer, String> filters = new HashMap<Integer, String>();
            int j = 1;
            for(Filter filter : secfc.getFilters()){
                filters.put(j++, filter.getClass().getName());
            }
            filterChains.put(i++, filters);
        }
        return filterChains;
    }

Here we could see that just by declaring the <security:http> element with one minimum configuration, all the default filters are included, but none of them is of a Authentication type (4th group in 13.3 Filter Ordering section). So it actually means that just by declaring the security:http element, the SecurityContextPersistenceFilter, the ExceptionTranslationFilter and the FilterSecurityInterceptor are auto-configured.

In fact, one authentication processing mechanism should be configured, and even security namespace beans processing claims for that, throwing an error during startup, but it can be bypassed adding an entry-point-ref attribute in <http:security>

If I add a basic <form-login> to the configuration, this way:

<security:http authentication-manager-ref="mainAuthenticationManager">
    <security:intercept-url pattern="/sectest/zone1/**" access="hasRole('ROLE_ADMIN')"/>
    <security:form-login />
</security:http>

Now, the filterChain will be like this:

{
        "1": "org.springframework.security.web.context.SecurityContextPersistenceFilter",
        "2": "org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter",
        "3": "org.springframework.security.web.header.HeaderWriterFilter",
        "4": "org.springframework.security.web.csrf.CsrfFilter",
        "5": "org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter",
        "6": "org.springframework.security.web.authentication.ui.DefaultLoginPageGeneratingFilter",
        "7": "org.springframework.security.web.savedrequest.RequestCacheAwareFilter",
        "8": "org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter",
        "9": "org.springframework.security.web.authentication.AnonymousAuthenticationFilter",
        "10": "org.springframework.security.web.session.SessionManagementFilter",
        "11": "org.springframework.security.web.access.ExceptionTranslationFilter",
        "12": "org.springframework.security.web.access.intercept.FilterSecurityInterceptor"
    }

Now, this two filters org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter and org.springframework.security.web.authentication.ui.DefaultLoginPageGeneratingFilter are created and configured in the FilterChainProxy.

So, now, the questions:

Is it that for the spring provided form-login, UsernamePasswordAuthenticationFilter is only used for /login, and latter filters are not?

Yes, it is used to try to complete a login processing mechanism in case the request matches the UsernamePasswordAuthenticationFilter url. This url can be configured or even changed it's behaviour to match every request.

You could too have more than one Authentication processing mechanisms configured in the same FilterchainProxy (such as HttpBasic, CAS, etc).

Does the form-login namespace element auto-configure these filters?

No, the form-login element configures the UsernamePasswordAUthenticationFilter, and in case you don't provide a login-page url, it also configures the org.springframework.security.web.authentication.ui.DefaultLoginPageGeneratingFilter, which ends in a simple autogenerated login page.

The other filters are auto-configured by default just by creating a <security:http> element with no security:"none" attribute.

Does every request (authenticated or not) reach FilterSecurityInterceptor for non-login url?

Every request should reach it, as it is the element which takes care of whether the request has the rights to reach the requested url. But some of the filters processed before might stop the filter chain processing just not calling FilterChain.doFilter(request, response);. For example, a CSRF filter might stop the filter chain processing if the request has not the csrf parameter.

What if I want to secure my REST API with JWT-token, which is retrieved from login? I must configure two namespace configuration http tags, rights? Other one for /login with UsernamePasswordAuthenticationFilter, and another one for REST url's, with custom JwtAuthenticationFilter.

No, you are not forced to do this way. You could declare both UsernamePasswordAuthenticationFilter and the JwtAuthenticationFilter in the same http element, but it depends on the concrete behaviour of each of this filters. Both approaches are possible, and which one to choose finnally depends on own preferences.

Does configuring two http elements create two springSecurityFitlerChains?

Yes, that's true

Is UsernamePasswordAuthenticationFilter turned off by default, until I declare form-login?

Yes, you could see it in the filters raised in each one of the configs I posted

How do I replace SecurityContextPersistenceFilter with one, which will obtain Authentication from existing JWT-token rather than JSESSIONID?

You could avoid SecurityContextPersistenceFilter, just configuring session strategy in <http:element>. Just configure like this:

<security:http create-session="stateless" >

Or, In this case you could overwrite it with another filter, this way inside the <security:http> element:

<security:http ...>  
   <security:custom-filter ref="myCustomFilter" position="SECURITY_CONTEXT_FILTER"/>    
</security:http>
<beans:bean id="myCustomFilter" class="com.xyz.myFilter" />

EDIT:

One question about "You could too have more than one Authentication processing mechanisms configured in the same FilterchainProxy". Will the latter overwrite the authentication performed by first one, if declaring multiple (Spring implementation) authentication filters? How this relates to having multiple authentication providers?

This finally depends on the implementation of each filter itself, but it's true the fact that the latter authentication filters at least are able to overwrite any prior authentication eventually made by preceding filters.

But this won't necesarily happen. I have some production cases in secured REST services where I use a kind of authorization token which can be provided both as a Http header or inside the request body. So I configure two filters which recover that token, in one case from the Http Header and the other from the request body of the own rest request. It's true the fact that if one http request provides that authentication token both as Http header and inside the request body, both filters will try to execute the authentication mechanism delegating it to the manager, but it could be easily avoided simply checking if the request is already authenticated just at the begining of the doFilter() method of each filter.

Having more than one authentication filter is related to having more than one authentication providers, but don't force it. In the case I exposed before, I have two authentication filter but I only have one authentication provider, as both of the filters create the same type of Authentication object so in both cases the authentication manager delegates it to the same provider.

And opposite to this, I too have a scenario where I publish just one UsernamePasswordAuthenticationFilter but the user credentials both can be contained in DB or LDAP, so I have two UsernamePasswordAuthenticationToken supporting providers, and the AuthenticationManager delegates any authentication attempt from the filter to the providers secuentially to validate the credentials.

So, I think it's clear that neither the amount of authentication filters determine the amount of authentication providers nor the amount of provider determine the amount of filters.

Also, documentation states SecurityContextPersistenceFilter is responsible of cleaning the SecurityContext, which is important due thread pooling. If I omit it or provide custom implementation, I have to implement the cleaning manually, right? Are there more similar gotcha's when customizing the chain?

I did not look carefully into this filter before, but after your last question I've been checking it's implementation, and as usually in Spring, nearly everything could be configured, extended or overwrited.

The SecurityContextPersistenceFilter delegates in a SecurityContextRepository implementation the search for the SecurityContext. By default, a HttpSessionSecurityContextRepository is used, but this could be changed using one of the constructors of the filter. So it may be better to write an SecurityContextRepository which fits your needs and just configure it in the SecurityContextPersistenceFilter, trusting in it's proved behaviour rather than start making all from scratch.

Find a value in an array of objects in Javascript

Similar to previous answers I used the following:

    Array.prototype.getIemtByParam = function(paramPair) {
      var key = Object.keys(paramPair)[0];
      return this.find(function(item){return ((item[key] == paramPair[key]) ? true: false)});
    }

usage:

myArray.getIemtByParam(
    {name: 'Sasha'}
);

Export from pandas to_excel without row names (index)?

You need to set index=False in to_excel in order for it to not write the index column out, this semantic is followed in other Pandas IO tools, see http://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.to_excel.html and http://pandas.pydata.org/pandas-docs/stable/io.html

iOS: How to store username/password within an app?

The following should work just fine:

KeychainItemWrapper *keychainItem = [[KeychainItemWrapper alloc] initWithIdentifier:@"YourAppLogin" accessGroup:nil];
[keychainItem setObject:@"password you are saving" forKey:kSecValueData]; 
[keychainItem setObject:@"username you are saving" forKey:kSecAttrAccount];

How do I add a tool tip to a span element?

Here's the simple, built-in way:

<span title="My tip">text</span>

That gives you plain text tooltips. If you want rich tooltips, with formatted HTML in them, you'll need to use a library to do that. Fortunately there are loads of those.

Set CFLAGS and CXXFLAGS options using CMake

On Unix systems, for several projects, I added these lines into the CMakeLists.txt and it was compiling successfully because base (/usr/include) and local includes (/usr/local/include) go into separated directories:

set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -I/usr/local/include -L/usr/local/lib")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -I/usr/local/include")
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -L/usr/local/lib")

It appends the correct directory, including paths for the C and C++ compiler flags and the correct directory path for the linker flags.

Note: C++ compiler (c++) doesn't support -L, so we have to use CMAKE_EXE_LINKER_FLAGS

Truncate a SQLite table if it exists?

Unfortunately, we do not have a "TRUNCATE TABLE" command in SQLite, but you can use SQLite's DELETE command to delete the complete data from an existing table, though it is recommended to use the DROP TABLE command to drop the complete table and re-create it once again.

How to use ng-repeat without an html element

The above is correct but for a more general answer it is not enough. I needed to nest ng-repeat, but stay on the same html level, meaning write the elements in the same parent. The tags array contain tag(s) that also have a tags array. It is actually a tree.

[{ name:'name1', tags: [
  { name: 'name1_1', tags: []},
  { name: 'name1_2', tags: []}
  ]},
 { name:'name2', tags: [
  { name: 'name2_1', tags: []},
  { name: 'name2_2', tags: []}
  ]}
]

So here is what I eventually did.

<div ng-repeat-start="tag1 in tags" ng-if="false"></div>
    {{tag1}},
  <div ng-repeat-start="tag2 in tag1.tags" ng-if="false"></div>
    {{tag2}},
  <div ng-repeat-end ng-if="false"></div>
<div ng-repeat-end ng-if="false"></div>

Note the ng-if="false" that hides the start and end divs.

It should print

name1,name1_1,name1_2,name2,name2_1,name2_2,

Converting String to Int with Swift

Because a string might contain non-numerical characters you should use a guard to protect the operation. Example:

guard let labelInt:Int = Int(labelString) else {
    return
}

useLabelInt()

How to purge tomcat's cache when deploying a new .war file? Is there a config setting?

I have a bad time putting my war file at /etc/tomcat7/webapps but the real path was /var/lib/tomcat7/webapps. May you want to use sudo find / -type f -name "my-war-file.war" to know where is it.

And remove this folders /tmp/hsperfdata_* and /tmp/tomcat7-tomcat7-tmp.

Error importing SQL dump into MySQL: Unknown database / Can't create database

If you create your database in direct admin or cpanel, you must edit your sql with notepad or notepad++ and change CREATE DATABASE command to CREATE DATABASE IF NOT EXISTS in line22

How to convert .crt to .pem

You can do this conversion with the OpenSSL library

http://www.openssl.org/

Windows binaries can be found here:

http://www.slproweb.com/products/Win32OpenSSL.html

Once you have the library installed, the command you need to issue is:

openssl x509 -in mycert.crt -out mycert.pem -outform PEM

Tools to generate database tables diagram with Postgresql?

Inside Eclipse I've used the Clay plugin (ex Clay-Azurri). The free version allows to introspect ("reverse engineer") an existing DB schema (via JDBC) and make a diagram of some selected tables.

How to Alter Constraint

No. We cannot alter the constraint, only thing we can do is drop and recreate it

ALTER TABLE [TABLENAME] DROP CONSTRAINT [CONSTRAINTNAME]

Foreign Key Constraint

Alter Table Table1 Add Constraint [CONSTRAINTNAME] Foreign Key (Column) References Table2 (Column) On Update Cascade On Delete Cascade

Primary Key constraint

Alter Table Table add constraint [Primary Key] Primary key(Column1,Column2,.....)

How do I suspend painting for a control and its children?

This is even simpler, and perhaps hacky - as I can see a lot of GDI muscle on this thread, and is obviously only a good fit for certain scenarios. YMMV

In my scenario, I use what I'll refer to as a "Parent" UserControl - and during the Load event, I simply remove the control-to-be-manipulated from the Parent's .Controls collection, and the Parent's OnPaint takes care of completely painting the child control in whatever special way.. fully taking the child's paint capabilities offline.

Now, I hand off my child paint routine to an extension method based off this concept from Mike Gold for printing windows forms.

Here I'm needing a sub-set of labels to render perpendicular to the layout:

simple diagram of your Visual Studio IDE

Then, I exempt the child control from being painted, with this code in the ParentUserControl.Load event handler:

Private Sub ParentUserControl_Load(sender As Object, e As EventArgs) Handles MyBase.Load
    SetStyle(ControlStyles.UserPaint, True)
    SetStyle(ControlStyles.AllPaintingInWmPaint, True)

    'exempt this control from standard painting: 
    Me.Controls.Remove(Me.HostedControlToBeRotated) 
End Sub

Then, in the same ParentUserControl, we paint the control-to-be-manipulated from the ground up:

Protected Overrides Sub OnPaint(e As PaintEventArgs)
    'here, we will custom paint the HostedControlToBeRotated instance...

    'twist rendering mode 90 counter clockwise, and shift rendering over to right-most end 
    e.Graphics.SmoothingMode = Drawing2D.SmoothingMode.AntiAlias
    e.Graphics.TranslateTransform(Me.Width - Me.HostedControlToBeRotated.Height, Me.Height)
    e.Graphics.RotateTransform(-90)
    MyCompany.Forms.CustomGDI.DrawControlAndChildren(Me.HostedControlToBeRotated, e.Graphics)

    e.Graphics.ResetTransform()
    e.Graphics.Dispose()

    GC.Collect()
End Sub

Once you host the ParentUserControl somewhere, e.g. a Windows Form - I'm finding that my Visual Studio 2015 renders the form correctly at Design Time as well as runtime: ParentUserControl hosted in a Windows Form or perhaps other user control

Now, since my particular manipulation rotates the child control 90 degrees, I'm sure all the hot spots and interactivity has been destroyed in that region - but, the problem I was solving was all for a package label that needed to preview and print, which worked out fine for me.

If there are ways to reintroduce the hot spots and control-ness to my purposely orphaned control - I'd love to learn about that someday (not for this scenario, of course, but.. just to learn). Of course, WPF supports such craziness OOTB.. but.. hey.. WinForms is so much fun still, amiright?

How to printf long long

  • Your scanf() statement needs to use %lld too.
  • Your loop does not have a terminating condition.
  • There are far too many parentheses and far too few spaces in the expression

    pi += pow(-1.0, e) / (2.0*e + 1.0);
    
  • You add one on the first iteration of the loop, and thereafter zero to the value of 'pi'; this does not change the value much.
  • You should use an explicit return type of int for main().
  • On the whole, it is best to specify int main(void) when it ignores its arguments, though that is less of a categorical statement than the rest.
  • I dislike the explicit licence granted in C99 to omit the return from the end of main() and don't use it myself; I write return 0; to be explicit.

I think the whole algorithm is dubious when written using long long; the data type probably should be more like long double (with %Lf for the scanf() format, and maybe %19.16Lf for the printf() formats.

How to make <input type="date"> supported on all browsers? Any alternatives?

Any browser that does not support the input type date will default to the standard type, which is text, so all you have to do is check the type property (not the attribute), if it's not date, the date input is not supported by the browser, and you add your own datepicker:

if ( $('[type="date"]').prop('type') != 'date' ) {
    $('[type="date"]').datepicker();
}

FIDDLE

You can of course use any datepicker you want, jQuery UI's datepicker is probably the one most commonly used, but it does add quite a bit of javascript if you're not using the UI library for anything else, but there are hundreds of alternative datepickers to choose from.

The type attribute never changes, the browser will only fall back to the default text type for the property, so one has to check the property.
The attribute can still be used as a selector, as in the example above.

Sass - Converting Hex to RGBa for background opacity

SASS has a built-in rgba() function to evaluate values.

rgba($color, $alpha)

E.g.

rgba(#00aaff, 0.5) => rgba(0, 170, 255, 0.5)

An example using your own variables:

$my-color: #00aaff;
$my-opacity: 0.5;

.my-element {
  color: rgba($my-color, $my-opacity);
}

Outputs:

.my-element {
  color: rgba(0, 170, 255, 0.5);
}

Remove property for all objects in array

There are plenty of libraries out there. It all depends on how complicated your data structure is (e.g. consider deeply nested keys)

We like object-fields as it also works with deeply nested hierarchies (build for api fields parameter). Here is a simple code example

_x000D_
_x000D_
// const objectFields = require('object-fields');

const array = [ { bad: 'something', good: 'something' }, { bad: 'something', good: 'something' } ];

const retain = objectFields.Retainer(['good']);
retain(array);
console.log(array);
// => [ { good: 'something' }, { good: 'something' } ]
_x000D_
.as-console-wrapper {max-height: 100% !important; top: 0}
_x000D_
<script src="https://bundle.run/[email protected]"></script>
_x000D_
_x000D_
_x000D_

Disclaimer: I'm the author of object-fields

Selectors in Objective-C?

Don't think of the colon as part of the function name, think of it as a separator, if you don't have anything to separate (no value to go with the function) then you don't need it.

I'm not sure why but all this OO stuff seems to be foreign to Apple developers. I would strongly suggest grabbing Visual Studio Express and playing around with that too. Not because one is better than the other, just it's a good way to look at the design issues and ways of thinking.

Like

introspection = reflection
+ before functions/properties = static
- = instance level

It's always good to look at a problem in different ways and programming is the ultimate puzzle.

How to get the last element of a slice?

For just reading the last element of a slice:

sl[len(sl)-1]

For removing it:

sl = sl[:len(sl)-1]

See this page about slice tricks

Run php function on button click

No Problem You can use onClick() function easily without using any other interference of language,

<?php
echo '<br><Button onclick="document.getElementById(';?>'modal-wrapper2'<?php echo ').style.display=';?>'block'<?php echo '" name="comment" style="width:100px; color: white;background-color: black;border-radius: 10px; padding: 4px;">Show</button>';
?>

LINQ order by null column where order is ascending and nulls should be last

It really helps to understand the LINQ query syntax and how it is translated to LINQ method calls.

It turns out that

var products = from p in _context.Products
               where p.ProductTypeId == 1
               orderby p.LowestPrice.HasValue descending
               orderby p.LowestPrice descending
               select p;

will be translated by the compiler to

var products = _context.Products
                       .Where(p => p.ProductTypeId == 1)
                       .OrderByDescending(p => p.LowestPrice.HasValue)
                       .OrderByDescending(p => p.LowestPrice)
                       .Select(p => p);

This is emphatically not what you want. This sorts by Product.LowestPrice.HasValue in descending order and then re-sorts the entire collection by Product.LowestPrice in descending order.

What you want is

var products = _context.Products
                       .Where(p => p.ProductTypeId == 1)
                       .OrderByDescending(p => p.LowestPrice.HasValue)
                       .ThenBy(p => p.LowestPrice)
                       .Select(p => p);

which you can obtain using the query syntax by

var products = from p in _context.Products
               where p.ProductTypeId == 1
               orderby p.LowestPrice.HasValue descending,
                       p.LowestPrice
               select p;

For details of the translations from query syntax to method calls, see the language specification. Seriously. Read it.

Writing MemoryStream to Response Object

The problem for me was that my stream was not set to the origin before download.

Response.Clear();
Response.ContentType = "Application/msword";
Response.AddHeader("Content-Disposition", "attachment; filename=myfile.docx");

//ADDED THIS LINE
myMemoryStream.Seek(0,SeekOrigin.Begin);

myMemoryStream.WriteTo(Response.OutputStream); 
Response.Flush();
Response.Close();

How to write an ArrayList of Strings into a text file?

You might use ArrayList overloaded method toString()

String tmp=arr.toString();
PrintWriter pw=new PrintWriter(new FileOutputStream(file));
pw.println(tmp.substring(1,tmp.length()-1));

Core Data: Quickest way to delete all instances of an entity

Reset Entity in Swift 3 :

func resetAllRecords(in entity : String) // entity = Your_Entity_Name
    {

        let context = ( UIApplication.shared.delegate as! AppDelegate ).persistentContainer.viewContext
        let deleteFetch = NSFetchRequest<NSFetchRequestResult>(entityName: entity)
        let deleteRequest = NSBatchDeleteRequest(fetchRequest: deleteFetch)
        do
        {
            try context.execute(deleteRequest)
            try context.save()
        }
        catch
        {
            print ("There was an error")
        }
    }

Passing vector by reference

If you define your function to take argument of std::vector<int>& arr and integer value, then you can use push_back inside that function:

void do_something(int el, std::vector<int>& arr)
{
    arr.push_back(el);
    //....
}

usage:

std::vector<int> arr;
do_something(1, arr); 

Split a vector into chunks

I needed the same function and have read the previous solutions, however i also needed to have the unbalanced chunk to be at the end i.e if i have 10 elements to split them into vectors of 3 each, then my result should have vectors with 3,3,4 elements respectively. So i used the following (i left the code unoptimised for readability, otherwise no need to have many variables):

chunk <- function(x,n){
  numOfVectors <- floor(length(x)/n)
  elementsPerVector <- c(rep(n,numOfVectors-1),n+length(x) %% n)
  elemDistPerVector <- rep(1:numOfVectors,elementsPerVector)
  split(x,factor(elemDistPerVector))
}
set.seed(1)
x <- rnorm(10)
n <- 3
chunk(x,n)
$`1`
[1] -0.6264538  0.1836433 -0.8356286

$`2`
[1]  1.5952808  0.3295078 -0.8204684

$`3`
[1]  0.4874291  0.7383247  0.5757814 -0.3053884

Configuring IntelliJ IDEA for unit testing with JUnit

If you already have test classes you may:

1) Put a cursor on a class declaration and press Alt + Enter. In the dialogue choose JUnit and press Fix. This is a standard way to create test classes in IntelliJ.

2) Alternatively you may add JUnit jars manually (download from site or take from IntelliJ files).

How to print a stack trace in Node.js?

@isaacs answer is correct, but if you need more specific or cleaner error stack, you can use this function:

function getCleanerStack() {
   var err = new Error();
   Error.captureStackTrace(err, getStack);

   return err.stack;
}

This function is inspired directly from the console.trace function in NodeJS.

Source code: Recent version or Old version.

Bootstrap table striped: How do I change the stripe background colour?

Easiest way for changing order of striped:

Add empty tr before your table tr tags.

Resize height with Highcharts

You must set the height of the container explicitly

#container {
    height:100%;
    width:100%;
    position:absolute; 
}

See other Stackoverflow answer

Highcharts documentation

C# Macro definitions in Preprocessor

Since C# 7.0 supports using static directive and Local functions you don't need preprocessor macros for most cases.

How to display text in pygame?

Here is my answer:


    def draw_text(text, font_name, size, color, x, y, align="nw"):
        font = pg.font.Font(font_name, size)
        text_surface = font.render(text, True, color)
        text_rect = text_surface.get_rect()
        if align == "nw":
            text_rect.topleft = (x, y)
        if align == "ne":
            text_rect.topright = (x, y)
        if align == "sw":
            text_rect.bottomleft = (x, y)
        if align == "se":
            text_rect.bottomright = (x, y)
        if align == "n":
            text_rect.midtop = (x, y)
        if align == "s":
            text_rect.midbottom = (x, y)
        if align == "e":
            text_rect.midright = (x, y)
        if align == "w":
            text_rect.midleft = (x, y)
        if align == "center":
            text_rect.center = (x, y)
        screen.blit(text_surface, text_rect)

Of course, you'll need to import pygame, a font and a screen, but this is just a def to add on to the rest of the code, and then call "draw_text".

"Eliminate render-blocking CSS in above-the-fold content"

Hi For jQuery You can only use like this

Use async and type="text/javascript" only

Windows 7 SDK installation failure

Uninstalling all C++ redistributables and unchecking the C++ option worked for me. Note that I have VS2010 SP1, and VS2012 installed already.

How to create the most compact mapping n ? isprime(n) up to a limit N?

public static boolean isPrime(int number) {
 if(number < 2)
   return false;
 else if(number == 2 || number == 3)
        return true;
      else {
        for(int i=2;i<=number/2;i++)
           if(number%i == 0)
             return false;
           else if(i==number/2)
                return true;
      }
    return false;
}

NuGet Packages are missing

There seem to be multiple causes for this.

For mine, it was that the .csproj file contained references to two different versions of Microsoft.Bcl.Build.targets:

<Import Project="..\packages\Microsoft.Bcl.Build.1.0.14\tools\Microsoft.Bcl.Build.targets" Condition="Exists('..\packages\Microsoft.Bcl.Build.1.0.14\tools\Microsoft.Bcl.Build.targets')" />
<Target Name="EnsureBclBuildImported" BeforeTargets="BeforeBuild" Condition="'$(BclBuildImported)' == ''">
    <Error Condition="!Exists('..\packages\Microsoft.Bcl.Build.1.0.14\tools\Microsoft.Bcl.Build.targets')" Text="This project references NuGet package(s) that are missing on this computer. Enable NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=317567." HelpKeyword="BCLBUILD2001" />
    <Error Condition="Exists('..\packages\Microsoft.Bcl.Build.1.0.14\tools\Microsoft.Bcl.Build.targets')" Text="The build restored NuGet packages. Build the project again to include these packages in the build. For more information, see http://go.microsoft.com/fwlink/?LinkID=317568." HelpKeyword="BCLBUILD2002" />
</Target>


<Import Project="..\packages\Microsoft.Bcl.Build.1.0.21\build\Microsoft.Bcl.Build.targets" Condition="Exists('..\packages\Microsoft.Bcl.Build.1.0.21\build\Microsoft.Bcl.Build.targets')" />
<Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
    <PropertyGroup>
        <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
    </PropertyGroup>
    <Error Condition="!Exists('..\packages\Microsoft.Bcl.Build.1.0.21\build\Microsoft.Bcl.Build.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Microsoft.Bcl.Build.1.0.21\build\Microsoft.Bcl.Build.targets'))" />
</Target>

I removed the old reference, and it solved the problem.

How to update specific key's value in an associative array in PHP?

PHP array_walk() function is specifically for altering array.

Try this:

array_walk ( $data, function (&$key) { 
    $key["transaction_date"] = date('d/m/Y',$key["transaction_date"]); 
});

Best practice to validate null and empty collection in Java

If you need to check for null, that is the way. However, if you have control on this, just return empty collection, whenever you can, and check only for empty later on.

This thread is about the same thing with C#, but the principles applies equally well to java. Like mentioned there, null should be returned only if

  • null might mean something more specific;
  • your API (contract) might force you to return null.

How to decrypt Hash Password in Laravel

For compare hashed password with the plain text password string you can use the PHP password_verify

if(password_verify('1234567', $crypt_password_string)) {
    // in case if "$crypt_password_string" actually hides "1234567"
}

Playing MP4 files in Firefox using HTML5 video

I can confirm that mp4 just will not work in the video tag. No matter how much you try to mess with the type tag and the codec and the mime types from the server.

Crazy, because for the same exact video, on the same test page, the old embed tag for an mp4 works just fine in firefox. I spent all yesterday messing with this. Firefox is like IE all of a sudden, hours and hours of time, not billable. Yay.

Speaking of IE, it fails FAR MORE gracefully on this. When it can't match up the format it falls to the content between the tags, so it is possible to just put video around object around embed and everything works great. Firefox, nope, despite failing, it puts up the poster image (greyed out so that isn't even useful as a fallback) with an error message smack in the middle. So now the options are put in browser recognition code (meaning we've gained nothing on embedding videos in the last ten years) or ditch html5.

How to format a Java string with leading zero?

String input = "Apple";
StringBuffer buf = new StringBuffer(input);

while (buf.length() < 8) {
  buf.insert(0, '0');
}

String output = buf.toString();

MySQL stored procedure return value

Add:

  • DELIMITER at the beginning and end of the SP.
  • DROP PROCEDURE IF EXISTS validar_egreso; at the beginning
  • When calling the SP, use @variableName.

This works for me. (I modified some part of your script so ANYONE can run it with out having your tables).

DROP PROCEDURE IF EXISTS `validar_egreso`;

DELIMITER $$

CREATE DEFINER='root'@'localhost' PROCEDURE `validar_egreso` (
    IN codigo_producto VARCHAR(100),
    IN cantidad INT,
    OUT valido INT(11)
)
BEGIN

    DECLARE resta INT;
    SET resta = 0;

    SELECT (codigo_producto - cantidad) INTO resta;

    IF(resta > 1) THEN
       SET valido = 1;
    ELSE
       SET valido = -1;
    END IF;

    SELECT valido;
END $$

DELIMITER ;

-- execute the stored procedure
CALL validar_egreso(4, 1, @val);

-- display the result
select @val;

Best Practice to Organize Javascript Library & CSS Folder Structure

 root/
   assets/
      lib/-------------------------libraries--------------------
          bootstrap/--------------Libraries can have js/css/images------------
              css/
              js/
              images/  
          jquery/
              js/
          font-awesome/
              css/
              images/
     common/--------------------common section will have application level resources             
          css/
          js/
          img/

 index.html

This is how I organized my application's static resources.

Best way to return a value from a python script

If you want your script to return values, just do return [1,2,3] from a function wrapping your code but then you'd have to import your script from another script to even have any use for that information:

Return values (from a wrapping-function)

(again, this would have to be run by a separate Python script and be imported in order to even do any good):

import ...
def main():
    # calculate stuff
    return [1,2,3]

Exit codes as indicators

(This is generally just good for when you want to indicate to a governor what went wrong or simply the number of bugs/rows counted or w/e. Normally 0 is a good exit and >=1 is a bad exit but you could inter-prate them in any way you want to get data out of it)

import sys
# calculate and stuff
sys.exit(100)

And exit with a specific exit code depending on what you want that to tell your governor. I used exit codes when running script by a scheduling and monitoring environment to indicate what has happened.

(os._exit(100) also works, and is a bit more forceful)

Stdout as your relay

If not you'd have to use stdout to communicate with the outside world (like you've described). But that's generally a bad idea unless it's a parser executing your script and can catch whatever it is you're reporting to.

import sys
# calculate stuff
sys.stdout.write('Bugs: 5|Other: 10\n')
sys.stdout.flush()
sys.exit(0)

Are you running your script in a controlled scheduling environment then exit codes are the best way to go.

Files as conveyors

There's also the option to simply write information to a file, and store the result there.

# calculate
with open('finish.txt', 'wb') as fh:
    fh.write(str(5)+'\n')

And pick up the value/result from there. You could even do it in a CSV format for others to read simplistically.

Sockets as conveyors

If none of the above work, you can also use network sockets locally *(unix sockets is a great way on nix systems). These are a bit more intricate and deserve their own post/answer. But editing to add it here as it's a good option to communicate between processes. Especially if they should run multiple tasks and return values.

position fixed header in html

Your #container should be outside of the #header-wrap, then specify a fixed height for #header-wrap, after, specify margin-top for #container equal to the #header-wrap's height. Something like this:

#header-wrap {
    position: fixed;
    height: 200px;
    top: 0;
    width: 100%;
    z-index: 100;
}
#container{ 
    margin-top: 200px;
}

Hope this is what you need: http://jsfiddle.net/KTgrS/

Representational state transfer (REST) and Simple Object Access Protocol (SOAP)

SOAP and REST both refer to ways for different systems to talk to each other.

REST does this using techniques that resemble the communication that your browser has with web servers: using GET to request a web page, POSTing in form fields, etc.

SOAP provides for something similar but does everything through sending blocks of XML back and forth. Another key component of SOAP is WSDL which is an XML document that describes what functions and data elements are supported. WSDLs can be used to programmatically "discover" what functions are supported as well as to generate programming code stubs.

Hide "NFC Tag type not supported" error on Samsung Galaxy devices

Before Android 4.4

What you are trying to do is simply not possible from an app (at least not on a non-rooted/non-modified device). The message "NFC tag type not supported" is displayed by the Android system (or more specifically the NFC system service) before and instead of dispatching the tag to your app. This means that the NFC system service filters MIFARE Classic tags and never notifies any app about them. Consequently, your app can't detect MIFARE Classic tags or circumvent that popup message.

On a rooted device, you may be able to bypass the message using either

  1. Xposed to modify the behavior of the NFC service, or
  2. the CSC (Consumer Software Customization) feature configuration files on the system partition (see /system/csc/. The NFC system service disables the popup and dispatches MIFARE Classic tags to apps if the CSC feature <CscFeature_NFC_EnableSecurityPromptPopup> is set to any value but "mifareclassic" or "all". For instance, you could use:

    <CscFeature_NFC_EnableSecurityPromptPopup>NONE</CscFeature_NFC_EnableSecurityPromptPopup>
    

    You could add this entry to, for instance, the file "/system/csc/others.xml" (within the section <FeatureSet> ... </FeatureSet> that already exists in that file).

Since, you asked for the Galaxy S6 (the question that you linked) as well: I have tested this method on the S4 when it came out. I have not verified if this still works in the latest firmware or on other devices (e.g. the S6).

Since Android 4.4

This is pure guessing, but according to this (link no longer available), it seems that some apps (e.g. NXP TagInfo) are capable of detecting MIFARE Classic tags on affected Samsung devices since Android 4.4. This might mean that foreground apps are capable of bypassing that popup using the reader-mode API (see NfcAdapter.enableReaderMode) possibly in combination with NfcAdapter.FLAG_READER_SKIP_NDEF_CHECK.

RESTful Authentication via Spring

You might consider Digest Access Authentication. Essentially the protocol is as follows:

  1. Request is made from client
  2. Server responds with a unique nonce string
  3. Client supplies a username and password (and some other values) md5 hashed with the nonce; this hash is known as HA1
  4. Server is then able to verify client's identity and serve up the requested materials
  5. Communication with the nonce can continue until the server supplies a new nonce (a counter is used to eliminate replay attacks)

All of this communication is made through headers, which, as jmort253 points out, is generally more secure than communicating sensitive material in the url parameters.

Digest Access Authentication is supported by Spring Security. Notice that, although the docs say that you must have access to your client's plain-text password, you can successfully authenticate if you have the HA1 hash for your client.

return error message with actionResult

IN your view insert

@Html.ValidationMessage("Error")

then in the controller after you use new in your model

var model = new yourmodel();
try{
[...]
}catch(Exception ex){
ModelState.AddModelError("Error", ex.Message);
return View(model);
}

Delete all data rows from an Excel table (apart from the first)

This is how I clear the data:

Sub Macro3()
    With Sheet1.ListObjects("Table1")
        If Not .DataBodyRange Is Nothing Then
            .DataBodyRange.Delete
        End If
    End With
End Sub

Custom fonts and XML layouts (Android)

You can make easily custom textview class :-

So what you need to do first, make Custom textview class which extended with AppCompatTextView.

public class CustomTextView extends AppCompatTextView {
    private int mFont = FontUtils.FONTS_NORMAL;
    boolean fontApplied;

    public CustomTextView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init(attrs, context);
    }

    public CustomTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(attrs, context);
    }

    public CustomTextView(Context context) {
        super(context);
        init(null, context);
    }

    protected void init(AttributeSet attrs, Context cxt) {
        if (!fontApplied) {
            if (attrs != null) {
                mFont = attrs.getAttributeIntValue(
                        "http://schemas.android.com/apk/res-auto", "Lato-Regular.ttf",
                        -1);
            }
            Typeface typeface = getTypeface();
            int typefaceStyle = Typeface.NORMAL;
            if (typeface != null) {
                typefaceStyle = typeface.getStyle();
            }
            if (mFont > FontUtils.FONTS) {
                typefaceStyle = mFont;
            }
            FontUtils.applyFont(this, typefaceStyle);
            fontApplied = true;
        }
    }
}

Now , every time Custom text view call and we will get int value from attribute int fontValue = attrs.getAttributeIntValue("http://schemas.android.com/apk/res-auto","Lato-Regular.ttf",-1).

Or

We can also get getTypeface() from view which we set in our xml (android:textStyle="bold|normal|italic"). So do what ever you want to do.

Now, we make FontUtils for set any .ttf font into our view.

public class FontUtils {

    public static final int FONTS = 1;
    public static final int FONTS_NORMAL = 2;
    public static final int FONTS_BOLD = 3;
    public static final int FONTS_BOLD1 = 4;

    private static Map<String, Typeface> TYPEFACE = new HashMap<String, Typeface>();

    static Typeface getFonts(Context context, String name) {
        Typeface typeface = TYPEFACE.get(name);
        if (typeface == null) {
            typeface = Typeface.createFromAsset(context.getAssets(), name);
            TYPEFACE.put(name, typeface);
        }
        return typeface;
    }

    public static void applyFont(TextView tv, int typefaceStyle) {

        Context cxt = tv.getContext();
        Typeface typeface;

        if(typefaceStyle == Typeface.BOLD_ITALIC) {
            typeface = FontUtils.getFonts(cxt, "FaktPro-Normal.ttf");
        }else if (typefaceStyle == Typeface.BOLD || typefaceStyle == SD_FONTS_BOLD|| typefaceStyle == FONTS_BOLD1) {
            typeface = FontUtils.getFonts(cxt, "FaktPro-SemiBold.ttf");
        } else if (typefaceStyle == Typeface.ITALIC) {
            typeface = FontUtils.getFonts(cxt, "FaktPro-Thin.ttf");
        } else {
            typeface = FontUtils.getFonts(cxt, "FaktPro-Normal.ttf");
        }
        if (typeface != null) {
            tv.setTypeface(typeface);
        }
    }
}

What is the best way to repeatedly execute a function every x seconds?

You might want to consider Twisted which is a Python networking library that implements the Reactor Pattern.

from twisted.internet import task, reactor

timeout = 60.0 # Sixty seconds

def doWork():
    #do work here
    pass

l = task.LoopingCall(doWork)
l.start(timeout) # call every sixty seconds

reactor.run()

While "while True: sleep(60)" will probably work Twisted probably already implements many of the features that you will eventually need (daemonization, logging or exception handling as pointed out by bobince) and will probably be a more robust solution

Error Microsoft.Web.Infrastructure, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35

Update-Package -reinstall Microsoft.Web.Infrastructure didn't work for me, as I kept receiving errors that it was already installed.

I had to navigate to the Microsoft.Web.Infrastructure.1.0.0.0 folder in the packages folder and manually delete that folder.

After doing this, running Install-Package Microsoft.Web.Infrastructure installed it.

Note: CopyLocal was automatically set to true.

Is there a cross-domain iframe height auto-resizer that works?

I got the solution for setting the height of the iframe dynamically based on it's content. This works for the cross domain content. There are some steps to follow to achieve this.

  1. Suppose you have added iframe in "abc.com/page" web page

    <div> <iframe id="IframeId" src="http://xyz.pqr/contactpage" style="width:100%;" onload="setIframeHeight(this)"></iframe> </div>

  2. Next you have to bind windows "message" event under web page "abc.com/page"

window.addEventListener('message', function (event) {
//Here We have to check content of the message event  for safety purpose
//event data contains message sent from page added in iframe as shown in step 3
if (event.data.hasOwnProperty("FrameHeight")) {
        //Set height of the Iframe
        $("#IframeId").css("height", event.data.FrameHeight);        
    }
});

On iframe load you have to send message to iframe window content with "FrameHeight" message:

function setIframeHeight(ifrm) {
   var height = ifrm.contentWindow.postMessage("FrameHeight", "*");   
}
  1. On main page that added under iframe here "xyz.pqr/contactpage" you have to bind windows "message" event where all messages are going to receive from parent window of "abc.com/page"
window.addEventListener('message', function (event) {

    // Need to check for safety as we are going to process only our messages
    // So Check whether event with data(which contains any object) contains our message here its "FrameHeight"
   if (event.data == "FrameHeight") {

        //event.source contains parent page window object 
        //which we are going to use to send message back to main page here "abc.com/page"

        //parentSourceWindow = event.source;

        //Calculate the maximum height of the page
        var body = document.body, html = document.documentElement;
        var height = Math.max(body.scrollHeight, body.offsetHeight,
            html.clientHeight, html.scrollHeight, html.offsetHeight);

       // Send height back to parent page "abc.com/page"
        event.source.postMessage({ "FrameHeight": height }, "*");       
    }
});

How to tell which disk Windows Used to Boot

a simpler way search downloads in the start menu and click on downloads in the search results to see where it will take you the drive will be highlighted in the explorer.

How to set the default value of an attribute on a Laravel model

The other answers are not working for me - they may be outdated. This is what I used as my solution for auto setting an attribute:

/**
 * The "booting" method of the model.
 *
 * @return void
 */
protected static function boot()
{
    parent::boot();

    // auto-sets values on creation
    static::creating(function ($query) {
        $query->is_voicemail = $query->is_voicemail ?? true;
    });
}

Using Rsync include and exclude options to include directory and file by pattern

Add -m to the recommended answer above to prune empty directories.

Get the current fragment object

Now at some point of time I need to identify which object is currently there

Call findFragmentById() on FragmentManager and determine which fragment is in your R.id.frameTitle container.

If you are using the androidx edition of Fragment — as you should in modern apps — , use getSupportFragmentManager() on your FragmentActivity/AppCompatActivity instead of getFragmentManager()

Does Ruby have a string.startswith("abc") built in method?

You can use String =~ Regex. It returns position of full regex match in string.

irb> ("abc" =~ %r"abc") == 0
=> true
irb> ("aabc" =~ %r"abc") == 0
=> false

Slick Carousel Uncaught TypeError: $(...).slick is not a function

It's hard to tell without looking at the full code but this type of error

Uncaught TypeError: $(...).slick is not a function

Usually means that you either forgot to include slick.js in the page or you included it before jquery.

Make sure jquery is the first js file and you included the slick.js library after it.

Split column at delimiter in data frame

strsplit(c('a|b','b|c'),'|',fixed=TRUE)

Check if Key Exists in NameValueCollection

I am using this collection, when I worked in small elements collection.

Where elements lot, I think need use "Dictionary". My code:

NameValueCollection ProdIdes;
string prodId = _cfg.ProdIdes[key];
if (string.IsNullOrEmpty(prodId))
{
    ......
}

Or may be use this:

 string prodId = _cfg.ProdIdes[key] !=null ? "found" : "not found";

How to delete all instances of a character in a string in python?

>>> x = 'it is icy'.replace('i', '', 1)
>>> x
't is icy'

Since your code would only replace the first instance, I assumed that's what you wanted. If you want to replace them all, leave off the 1 argument.

Since you cannot replace the character in the string itself, you have to reassign it back to the variable. (Essentially, you have to update the reference instead of modifying the string.)

remove item from stored array in angular 2

Don't use delete to remove an item from array and use splice() instead.

this.data.splice(this.data.indexOf(msg), 1);

See a similar question: How do I remove a particular element from an array in JavaScript?

Note, that TypeScript is a superset of ES6 (arrays are the same in both TypeScript and JavaScript) so feel free to look for JavaScript solutions even when working with TypeScript.

int value under 10 convert to string two digit number

You can also do it this way

private static string GetPaddingSequence(int padding)
{
      StringBuilder SB = new StringBuilder();
      for (int i = 0; i < padding; i++)
      {
           SB.Append("0");
      }

      return SB.ToString();
  }

public static string FormatNumber(int number, int padding)
{
    return number.ToString(GetPaddingSequence(padding));
}

Finally call the function FormatNumber

string x = FormatNumber(1,2);

Output will be 01 which is based on your padding parameter. Increasing it will increase the number of 0s

Name [jdbc/mydb] is not bound in this Context

You need a ResourceLink in your META-INF/context.xml file to make the global resource available to the web application.

 <ResourceLink name="jdbc/mydb"
             global="jdbc/mydb"
              type="javax.sql.DataSource" />

How to create a jQuery function (a new jQuery method or plugin)?

It sounds like you want to extend the jQuery object via it's prototype (aka write a jQuery plugin). This would mean that every new object created through calling the jQuery function ($(selector/DOM element)) would have this method.

Here is a very simple example:

$.fn.myFunction = function () {
    alert('it works');
};

Demo

How to use OAuth2RestTemplate?

You can find examples for writing OAuth clients here:

In your case you can't just use default or base classes for everything, you have a multiple classes Implementing OAuth2ProtectedResourceDetails. The configuration depends of how you configured your OAuth service but assuming from your curl connections I would recommend:

@EnableOAuth2Client
@Configuration
class MyConfig{

    @Value("${oauth.resource:http://localhost:8082}")
    private String baseUrl;
    @Value("${oauth.authorize:http://localhost:8082/oauth/authorize}")
    private String authorizeUrl;
    @Value("${oauth.token:http://localhost:8082/oauth/token}")
    private String tokenUrl;

    @Bean
    protected OAuth2ProtectedResourceDetails resource() {
        ResourceOwnerPasswordResourceDetails resource;
        resource = new ResourceOwnerPasswordResourceDetails();

        List scopes = new ArrayList<String>(2);
        scopes.add("write");
        scopes.add("read");
        resource.setAccessTokenUri(tokenUrl);
        resource.setClientId("restapp");
        resource.setClientSecret("restapp");
        resource.setGrantType("password");
        resource.setScope(scopes);
        resource.setUsername("**USERNAME**");
        resource.setPassword("**PASSWORD**");
        return resource;
    }

    @Bean
    public OAuth2RestOperations restTemplate() {
        AccessTokenRequest atr = new DefaultAccessTokenRequest();
        return new OAuth2RestTemplate(resource(), new DefaultOAuth2ClientContext(atr));
    }
}

@Service
@SuppressWarnings("unchecked")
class MyService {

    @Autowired
    private OAuth2RestOperations restTemplate;

    public MyService() {
        restTemplate.getAccessToken();
    }
}

Do not forget about @EnableOAuth2Client on your config class, also I would suggest to try that the urls you are using are working with curl first, also try to trace it with the debugger because lot of exceptions are just consumed and never printed out due security reasons, so it gets little hard to find where the issue is. You should use logger with debug enabled set. Good luck

I uploaded sample springboot app on github https://github.com/mariubog/oauth-client-sample to depict your situation because I could not find any samples for your scenario .

How to read barcodes with the camera on Android?

There are two parts in building barcode scanning feature, one capturing barcode image using camera and second extracting barcode value from the image.

Barcode image can be captured from your app using camera app and barcode value can be extracted using Firebase Machine Learning Kit barcode scanning API.

Here is an example app https://www.zoftino.com/android-barcode-scanning-example

In git, what is the difference between merge --squash and rebase?

Merge squash merges a tree (a sequence of commits) into a single commit. That is, it squashes all changes made in n commits into a single commit.

Rebasing is re-basing, that is, choosing a new base (parent commit) for a tree. Maybe the mercurial term for this is more clear: they call it transplant because it's just that: picking a new ground (parent commit, root) for a tree.

When doing an interactive rebase, you're given the option to either squash, pick, edit or skip the commits you are going to rebase.

Hope that was clear!

Jquery Ajax Call, doesn't call Success or Error

change your code to:

function ChangePurpose(Vid, PurId) {
    var Success = false;
    $.ajax({
        type: "POST",
        url: "CHService.asmx/SavePurpose",
        dataType: "text",
        async: false,
        data: JSON.stringify({ Vid: Vid, PurpId: PurId }),
        contentType: "application/json; charset=utf-8",
        success: function (data) {
            Success = true;
        },
        error: function (textStatus, errorThrown) {
            Success = false;
        }
    });
    //done after here
    return Success;
} 

You can only return the values from a synchronous function. Otherwise you will have to make a callback.

So I just added async:false, to your ajax call

Update:

jquery ajax calls are asynchronous by default. So success & error functions will be called when the ajax load is complete. But your return statement will be executed just after the ajax call is started.

A better approach will be:

     // callbackfn is the pointer to any function that needs to be called
     function ChangePurpose(Vid, PurId, callbackfn) {
        var Success = false;
        $.ajax({
            type: "POST",
            url: "CHService.asmx/SavePurpose",
            dataType: "text",
            data: JSON.stringify({ Vid: Vid, PurpId: PurId }),
            contentType: "application/json; charset=utf-8",
            success: function (data) {
                callbackfn(data)
            },
            error: function (textStatus, errorThrown) {
                callbackfn("Error getting the data")
            }
        });
     } 

     function Callback(data)
     {
        alert(data);
     }

and call the ajax as:

 // Callback is the callback-function that needs to be called when asynchronous call is complete
 ChangePurpose(Vid, PurId, Callback);

How-to turn off all SSL checks for postman for a specific site

There is an option in Postman if you download it from https://www.getpostman.com instead of the chrome store (most probably it has been introduced in the new versions and the chrome one will be updated later) not sure about the old ones.

In the settings, turn off the SSL certificate verification option enter image description here

Be sure to remember to reactivate it afterwards, this is a security feature.

If you really want to use the chrome app, you could always add an exception to chrome for the url: Enter the url you would like to open in the chrome browser, you'll get a warning with a link at the bottom of the page to add an exception, which if you do, it will also allow postman to access your url. But the first option of using the postman stand-alone app is much better.

I hope this can help.

Jenkins Slave port number for firewall

I have a similar scenario, and had no problem connecting after setting the JNLP port as you describe, and adding a single firewall rule allowing a connection on the server using that port. Granted it is a randomly selected client port going to a known server port (a host:ANY -> server:1 rule is needed).

From my reading of the source code, I don't see a way to set the local port to use when making the request from the slave. It's unfortunate, it would be a nice feature to have.

Alternatives:

Use a simple proxy on your client that listens on port N and then does forward all data to the actual Jenkins server on the remote host using a constant local port. Connect your slave to this local proxy instead of the real Jenkins server.

Create a custom Jenkins slave build that allows an option to specify the local port to use.

Remember also if you are using HTTPS via a self-signed certificate, you must alter the configuration jenkins-slave.xml file on the slave to specify the -noCertificateCheck option on the command line.

How do I convert an object to an array?

I had the same problem and I solved it with get_object_vars mentioned above.

Furthermore, I had to convert my object with json_decode and I had to iterate the array with the oldschool "for" loop (rather then for-each).

encapsulation vs abstraction real world example

I feel like encapsulation may make more sense to discuss when you see HOW NOT TO DO in programming. For example, consider a Car class as below.

 class Car{
   public float speed =0;
   public boolean isReverse = false;
   public boolean isStarted = false;
 }

The client code may use above car class as below.

class Main{
  public static void main(args String[]){
   Car car = new Car();
   // No need to start??
   car.speed = 100; // Turbo mode directly to 100
   car.speed = 0; // Turbo break
  }
}

See more at: http://brevitaz.com/encapsulation-example-benefits-java/

This is uncontrolled access to car speed and other variables. By encapsulation, Car class can have complete control over how the data variables within car class can be modified.

Any concrete entity that has some behavior is example of Encapsulation. The behavior is provided by wrapping up something and hiding something from client.In case of mobile, it is signals, chips, circuits, battery and so on.

For abstraction of the same example - normal user may say I am ok with anything using which I can make calls and receive calls. This abstraction can be substituted by any concrete mobile. Check out Abstraction examples.

How to get SQL from Hibernate Criteria API (*not* for logging)

Here's "another" way to get the SQL :

CriteriaImpl criteriaImpl = (CriteriaImpl)criteria;
SessionImplementor session = criteriaImpl.getSession();
SessionFactoryImplementor factory = session.getFactory();
CriteriaQueryTranslator translator=new CriteriaQueryTranslator(factory,criteriaImpl,criteriaImpl.getEntityOrClassName(),CriteriaQueryTranslator.ROOT_SQL_ALIAS);
String[] implementors = factory.getImplementors( criteriaImpl.getEntityOrClassName() );

CriteriaJoinWalker walker = new CriteriaJoinWalker((OuterJoinLoadable)factory.getEntityPersister(implementors[0]), 
                        translator,
                        factory, 
                        criteriaImpl, 
                        criteriaImpl.getEntityOrClassName(), 
                        session.getLoadQueryInfluencers()   );

String sql=walker.getSQLString();