SyntaxFix

Programs & Examples On #Nsbox

The NSBox class implements simple views that can title themselves and draw a border around their content. These objects are known as boxes. You can use box to group, visually, some number of other views.

Open page in new window without popup blocking

As a general rule, pop up blockers target windows that launch without user interaction. Usually a click event can open a window without it being blocked. (unless it's a really bad popup blocker)

Try launching after a click event

Cannot connect to local SQL Server with Management Studio

Same as matt said. The "SQL Server(SQLEXPRESS)" was stopped. Enabled it by opening Control Panel > Administrative Tools > Services, right-clicking on the "SQL Server(SQLEXPRESS)" service and selecting "Start" from the available options. Could connect fine after that.

How to set the focus for a particular field in a Bootstrap modal, once it appears

Seems it is because modal animation is enabled (fade in class of the dialog), after calling .modal('show'), the dialog is not immediately visible, so it can't get focus at this time.

I can think of two ways to solve this problem:

  1. Remove fade from class, so the dialog is immediately visible after calling .modal('show'). You can see http://codebins.com/bin/4ldqp7x/4 for demo. (Sorry @keyur, I mistakenly edited and saved as new version of your example)
  2. Call focus() in shown event like what @keyur wrote.

xcode library not found

In XCode 10.1, I had to set "Library Search Paths" to something like $(PROJECT_DIR)/.../path/to/your/library

Prevent WebView from displaying "web page not available"

Try this

 @SuppressWarnings("deprecation")
 @Override
 public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
      // Your handling
 }

 @Override
 public void onReceivedError(WebView view, WebResourceRequest req, WebResourceError rerr) {
      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
          onReceivedError(view, rerr.getErrorCode(), rerr.getDescription().toString(), req.getUrl().toString());
      }
 }

How can I validate a string to only allow alphanumeric characters in it?

You could do it easily with an extension function rather than a regex ...

public static bool IsAlphaNum(this string str)
{
    if (string.IsNullOrEmpty(str))
        return false;

    for (int i = 0; i < str.Length; i++)
    {
        if (!(char.IsLetter(str[i])) && (!(char.IsNumber(str[i]))))
            return false;
    }

    return true;
}

Per comment :) ...

public static bool IsAlphaNum(this string str)
{
    if (string.IsNullOrEmpty(str))
        return false;

    return (str.ToCharArray().All(c => Char.IsLetter(c) || Char.IsNumber(c)));
}

<embed> vs. <object>

Answer updated for 2020:

Both <object> and <embed> are included in the WHAT-WG HTML Living Standard (Sept 2020).

<object>

The object element can represent an external resource, which, depending on the type of the resource, will either be treated as an image, as a child browsing context, or as an external resource to be processed by a plugin.

<embed>

The embed element provides an integration point for an external (typically non-HTML) application or interactive content.

Are there advantages/disadvantages to using one tag vs. the other?

The opinion of Mozilla Developer Network (MDN) appears (albeit fairly subtly) to very marginally favour <object> over <embed> but overwhelmingly, MDN, wants to recommend that wherever you can, you avoid embedding external content entirely.

[...] you are unlikely to use these elements very much — Applets haven't been used for years, Flash is no longer very popular, due to a number of reasons (see The case against plugins, below), PDFs tend to be better linked to than embedded, and other content such as images and video have much better, easier elements to handle those. Plugins and these embedding methods are really a legacy technology, and we are mainly mentioning them in case you come across them in certain circumstances like intranets, or enterprise projects.

Once upon a time, plugins were indispensable on the Web. Remember the days when you had to install Adobe Flash Player just to watch a movie online? And then you constantly got annoying alerts about updating Flash Player and your Java Runtime Environment. Web technologies have since grown much more robust, and those days are over. For virtually all applications, it's time to stop delivering content that depends on plugins and start taking advantage of Web technologies instead.

Source: https://developer.mozilla.org/en-US/docs/Learn/HTML/Multimedia_and_embedding/Other_embedding_technologies#The_%3Cembed%3E_and_%3Cobject%3E_elements

Git - Ignore files during merge

Here git-update-index - Register file contents in the working tree to the index.

git update-index --assume-unchanged <PATH_OF_THE_FILE>

Example:-

git update-index --assume-unchanged somelocation/pom.xml

How to get column values in one comma separated value

For Mysql:

SELECT t.user, 

(SELECT GROUP_CONCAT( t1.department ) FROM table_name t1 WHERE t1.user = t.user)department

FROM table_name t
GROUP BY t.user
LIMIT 0 , 30

target input by type and name (selector)

You want a multiple attribute selector

$("input[type='checkbox'][name='ProductCode']").each(function(){ ...

or

$("input:checkbox[name='ProductCode']").each(function(){ ...

It would be better to use a CSS class to identify those that you want to select however as a lot of the modern browsers implement the document.getElementsByClassName method which will be used to select elements and be much faster than selecting by the name attribute

What was the strangest coding standard rule that you were forced to follow?

Every beginning and ending brace was required to have a comment:

public void HelloWorld(string name)
{

  if(name == "Joe")
  {
    Console.WriteLine("Hey, Joe!");
  } //if(name == "Joe")
  else
  {
    Console.WriteLine("Hello, " + name);
  } //if(name == "Joe")
} //public void HelloWorld(string name)

That's what led me to write my first Visual Studio plugin to automate that.

ALTER TABLE ADD COLUMN IF NOT EXISTS in SQLite

I solve it in 2 queries. This is my Unity3D script using System.Data.SQLite.

IDbCommand command = dbConnection.CreateCommand();
            command.CommandText = @"SELECT count(*) FROM pragma_table_info('Candidat') c WHERE c.name = 'BirthPlace'";
            IDataReader reader = command.ExecuteReader();
            while (reader.Read())
            {
                try
                {
                    if (int.TryParse(reader[0].ToString(), out int result))
                    {
                        if (result == 0)
                        {
                            command = dbConnection.CreateCommand();
                            command.CommandText = @"ALTER TABLE Candidat ADD COLUMN BirthPlace VARCHAR";
                            command.ExecuteNonQuery();
                            command.Dispose();
                        }
                    }
                }
                catch { throw; }
            }

Read from file in eclipse

Have you tried using an absolute path:

File file = new File(System.getProperty("user.dir") + "/file.txt");

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

If you have a package.json, you can install all the current project dependencies using:

npm install

What's the simplest way of detecting keyboard input in a script from the terminal?

Inspired from code found above (credits), the simple blocking (aka not CPU consuming) macOS version I was looking for:

import termios
import sys
import fcntl
import os

def getKeyCode(blocking = True):
    fd = sys.stdin.fileno()
    oldterm = termios.tcgetattr(fd)
    newattr = termios.tcgetattr(fd)
    newattr[3] = newattr[3] & ~termios.ICANON & ~termios.ECHO
    termios.tcsetattr(fd, termios.TCSANOW, newattr)
    if not blocking:
        oldflags = fcntl.fcntl(fd, fcntl.F_GETFL)
        fcntl.fcntl(fd, fcntl.F_SETFL, oldflags | os.O_NONBLOCK)
    try:
        return ord(sys.stdin.read(1))
    except IOError:
        return 0
    finally:
        termios.tcsetattr(fd, termios.TCSAFLUSH, oldterm)
        if not blocking:
            fcntl.fcntl(fd, fcntl.F_SETFL, oldflags)

def getKeyStroke():
    code  = getKeyCode()
    if code == 27:
        code2 = getKeyCode(blocking = False)
        if code2 == 0:
            return "esc"
        elif code2 == 91:
            code3 = getKeyCode(blocking = False)
            if code3 == 65:
                return "up"
            elif code3 == 66:
                return "down"
            elif code3 == 68:
                return "left"
            elif code3 == 67:
                return "right"
            else:
                return "esc?"
    elif code == 127:
        return "backspace"
    elif code == 9:
        return "tab"
    elif code == 10:
        return "return"
    elif code == 195 or code == 194:        
        code2 = getKeyCode(blocking = False)
        return chr(code)+chr(code2) # utf-8 char
    else:
        return chr(code)


while True:
    print getKeyStroke()

2017-11-09, EDITED: Not tested with Python 3

Converting std::__cxx11::string to std::string

In my case, I was having a similar problem:

/usr/bin/ld: Bank.cpp:(.text+0x19c): undefined reference to 'Account::SetBank(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)' collect2: error: ld returned 1 exit status

After some researches, I realized that the problem was being generated by the way that Visual Studio Code was compiling the Bank.cpp file. So, to solve that, I just prompted the follow command in order to compile the c++ file sucessful:

g++ Bank.cpp Account.cpp -o Bank

With the command above, It was able to linkage correctly the Header, Implementations and Main c++ files.

OBS: My g++ version: 9.3.0 on Ubuntu 20.04

iOS: how to perform a HTTP POST request?

EDIT: ASIHTTPRequest has been abandoned by the developer. It's still really good IMO, but you should probably look elsewhere now.

I'd highly recommend using the ASIHTTPRequest library if you are handling HTTPS. Even without https it provides a really nice wrapper for stuff like this and whilst it's not hard to do yourself over plain http, I just think the library is nice and a great way to get started.

The HTTPS complications are far from trivial in various scenarios, and if you want to be robust in handling all the variations, you'll find the ASI library a real help.

How to render an array of objects in React?

Shubham's answer explains very well. This answer is addition to it as per to avoid some pitfalls and refactoring to a more readable syntax

Pitfall : There is common misconception in rendering array of objects especially if there is an update or delete action performed on data. Use case would be like deleting an item from table row. Sometimes when row which is expected to be deleted, does not get deleted and instead other row gets deleted.

To avoid this, use key prop in root element which is looped over in JSX tree of .map(). Also adding React's Fragment will avoid adding another element in between of ul and li when rendered via calling method.

state = {
    userData: [
        { id: '1', name: 'Joe', user_type: 'Developer' },
        { id: '2', name: 'Hill', user_type: 'Designer' }
    ]
};

deleteUser = id => {
    // delete operation to remove item
};

renderItems = () => {
    const data = this.state.userData;

    const mapRows = data.map((item, index) => (
        <Fragment key={item.id}>
            <li>
                {/* Passing unique value to 'key' prop, eases process for virtual DOM to remove specific element and update HTML tree  */}
                <span>Name : {item.name}</span>
                <span>User Type: {item.user_type}</span>
                <button onClick={() => this.deleteUser(item.id)}>
                    Delete User
                </button>
            </li>
        </Fragment>
    ));
    return mapRows;
};

render() {
    return <ul>{this.renderItems()}</ul>;
}

Important : Decision to use which value should we pass to key prop also matters as common way is to use index parameter provided by .map().

TLDR; But there's a drawback to it and avoid it as much as possible and use any unique id from data which is being iterated such as item.id. There's a good article on this - https://medium.com/@robinpokorny/index-as-a-key-is-an-anti-pattern-e0349aece318

Use custom build output folder when using create-react-app

Support for BUILD_PATH just landed into v4.0.2.

Add BUILD_PATH variable to .env file and run build script command:

// .env file
BUILD_PATH=foo

That should place all build files into foo folder.

Creating a textarea with auto-resize

If scrollHeight could be trusted, then:

textarea.onkeyup=function() {
  this.style.height='';
  this.rows=this.value.split('\n').length;
  this.style.height=this.scrollHeight+'px';
}

Why does Java's hashCode() in String use 31 as a multiplier?

This is because 31 has a nice property – it's multiplication can be replaced by a bitwise shift which is faster than the standard multiplication:

31 * i == (i << 5) - i

how to create insert new nodes in JsonNode?

These methods are in ObjectNode: the division is such that most read operations are included in JsonNode, but mutations in ObjectNode and ArrayNode.

Note that you can just change first line to be:

ObjectNode jNode = mapper.createObjectNode();
// version ObjectMapper has should return ObjectNode type

or

ObjectNode jNode = (ObjectNode) objectCodec.createObjectNode();
// ObjectCodec is in core part, must be of type JsonNode so need cast

How to check if object property exists with a variable holding the property name?

Thank you for everyone's assistance and pushing to get rid of the eval statement. Variables needed to be in brackets, not dot notation. This works and is clean, proper code.

Each of these are variables: appChoice, underI, underObstr.

if(typeof tData.tonicdata[appChoice][underI][underObstr] !== "undefined"){
    //enter code here
}

What is N-Tier architecture?

It's my understanding that N-Tier separates business logic, client access and data from each other using separate physical machines. The theory is that one of them can be updated independently of the others.

Atom menu is missing. How do I re-enable

Same happened to me, I had to go into Packages and re-enable Tabs and Tree-View (both part of core).

Uploading an Excel sheet and importing the data into SQL Server database

 
A proposed solution will be:   


protected void Button1_Click(object sender, EventArgs e)
{
        try
        {
            CreateXMLFile();



        SqlConnection con = new SqlConnection(constring);
        con.Open();

        SqlCommand cmd = new SqlCommand("bulk_in", con);

        cmd.CommandType = CommandType.StoredProcedure;

        cmd.Parameters.AddWithValue("@account_det", sw_XmlString.ToString ());

       int i= cmd.ExecuteNonQuery();
            if(i>0)
            {
                Label1.Text = "File Upload successfully";
            }
            else
            {
                Label1.Text = "File Upload unsuccessfully";
                return;

            }


        con.Close();
            }
        catch(SqlException ex)
        {
            Label1.Text = ex.Message.ToString();
        }




    }
     public void CreateXMLFile()
        {

          try
            {
                M_Filepath = System.IO.Path.GetFileName(FileUpload1.PostedFile.FileName);
                fileExtn = Path.GetExtension(M_Filepath);
                strGuid = System.Guid.NewGuid().ToString();
                fNameArray = M_Filepath.Split('.');
                fName = fNameArray[0];

                xlRptName = fName + "_" + strGuid + "_" + DateTime.Now.ToShortDateString ().Replace ('/','-');
                 fileName =  xlRptName.Trim()  + fileExtn.Trim() ;



                 FileUpload1.PostedFile.SaveAs(ConfigurationManager.AppSettings["ImportFilePath"]+ fileName);



                strFileName = Path.GetFileName(FileUpload1.PostedFile.FileName).ToUpper() ;
                if (((strFileName) != "DEMO.XLS") && ((strFileName) != "DEMO.XLSX"))
                {
                    Label1.Text = "Excel File Must be DEMO.XLS or DEMO.XLSX";
                }
               FileUpload1.PostedFile.SaveAs(System.Configuration.ConfigurationManager.AppSettings["ImportFilePath"] + fileName);
               lstrFilePath = System.Configuration.ConfigurationManager.AppSettings["ImportFilePath"] + fileName;
               if (strFileName == "DEMO.XLS")
                {

                    strConn = "Provider=Microsoft.JET.OLEDB.4.0;" + "Data Source=" + lstrFilePath + ";" + "Extended Properties='Excel 8.0;HDR=YES;'";

                } 

                if (strFileName == "DEMO.XLSX")
                {
                    strConn = "Provider=Microsoft.ACE.OLEDB.12.0;" + "Data Source=" + lstrFilePath + ";" + "Extended Properties='Excel 12.0;HDR=YES;'";

                }

                strSQL = " Select [Name],[Mobile_num],[Account_number],[Amount],[date_a2] FROM [Sheet1$]";



                OleDbDataAdapter mydata = new OleDbDataAdapter(strSQL, strConn);

                mydata.TableMappings.Add("Table", "arul");
                mydata.Fill(dsExcl);
                dsExcl.DataSetName = "DocumentElement";
                intRowCnt = dsExcl.Tables[0].Rows.Count;
                intColCnt = dsExcl.Tables[0].Rows.Count;

                if(intRowCnt <1)
                {

                    Label1.Text = "No records in Excel File";
                    return;
                }
                if  (dsExcl==null)
                {

                }
                else
                    if(dsExcl.Tables[0].Rows.Count >= 1000 )
                    {

                        Label1.Text = "Excel data must be in less than 1000  ";
                    }


                for (intCtr = 0; intCtr <= dsExcl.Tables[0].Rows.Count - 1; intCtr++)
                {

                    if (Convert.IsDBNull(dsExcl.Tables[0].Rows[intCtr]["Name"]))
                    {
                        strValid = "";

                    }
                    else
                    {
                        strValid = dsExcl.Tables[0].Rows[intCtr]["Name"].ToString();
                    }
                    if (strValid == "")
                    {
                        Label1.Text = "Name should not be empty";
                        return;

                    }
                    else
                    {
                        strValid = "";
                    }



                    if (Convert.IsDBNull(dsExcl.Tables[0].Rows[intCtr]["Mobile_num"]))
                    {
                        strValid = "";

                    }
                    else
                    {
                        strValid = dsExcl.Tables[0].Rows[intCtr]["Mobile_num"].ToString();
                    }
                    if (strValid == "")
                    {
                        Label1.Text = "Mobile_num should not be empty";

                    }
                    else
                    {
                        strValid = "";
                    }

                    if (Convert.IsDBNull(dsExcl.Tables[0].Rows[intCtr]["Account_number"]))
                    {
                        strValid = "";

                    }
                    else
                    {
                        strValid = dsExcl.Tables[0].Rows[intCtr]["Account_number"].ToString();
                    }
                    if (strValid == "")
                    {
                        Label1.Text = "Account_number should not be empty";

                    }
                    else
                    {
                        strValid = "";
                    }





                    if (Convert.IsDBNull(dsExcl.Tables[0].Rows[intCtr]["Amount"]))
                    {
                        strValid = "";

                    }
                    else
                    {
                        strValid = dsExcl.Tables[0].Rows[intCtr]["Amount"].ToString();
                    }
                    if (strValid == "")
                    {
                        Label1.Text = "Amount should not be empty";

                    }
                    else
                    {
                        strValid = "";
                    }



                    if (Convert.IsDBNull(dsExcl.Tables[0].Rows[intCtr]["date_a2"]))
                    {
                        strValid = "";

                    }
                    else
                    {
                        strValid = dsExcl.Tables[0].Rows[intCtr]["date_a2"].ToString();
                    }
                    if (strValid == "")
                    {
                        Label1.Text = "date_a2 should not be empty";

                    }
                    else
                    {
                        strValid = "";
                    }
                }


            }
         catch 
            {

            }

         try
         {
             if(dsExcl.Tables[0].Rows.Count >0)
             {

                 dr = dsExcl.Tables[0].Rows[0];
             }
             dsExcl.Tables[0].TableName = "arul";
             dsExcl.WriteXml(sw_XmlString, XmlWriteMode.IgnoreSchema);

         }
         catch
         {

         }
}`enter code here`

What's an appropriate HTTP status code to return by a REST API service for a validation failure?

What exactly do you mean by "validation failure"? What are you validating? Are you referring to something like a syntax error (e.g. malformed XML)?

If that's the case, I'd say 400 Bad Request is probably the right thing, but without knowing what it is you're "validating", it's impossible to say.

Delete keychain items when an app is uninstalled

C# Xamarin version

    const string FIRST_RUN = "hasRunBefore";
    var userDefaults = NSUserDefaults.StandardUserDefaults;
    if (!userDefaults.BoolForKey(FIRST_RUN))
    {
        //TODO: remove keychain items
        userDefaults.SetBool(true, FIRST_RUN);
        userDefaults.Synchronize();
    }

... and to clear records from the keychain (TODO comment above)

        var securityRecords = new[] { SecKind.GenericPassword,
                                    SecKind.Certificate,
                                    SecKind.Identity,
                                    SecKind.InternetPassword,
                                    SecKind.Key
                                };
        foreach (var recordKind in securityRecords)
        {
            SecRecord query = new SecRecord(recordKind);
            SecKeyChain.Remove(query);
        }

Angular 4.3 - HttpClient set params

Before 5.0.0-beta.6

let httpParams = new HttpParams();
Object.keys(data).forEach(function (key) {
     httpParams = httpParams.append(key, data[key]);
});

Since 5.0.0-beta.6

Since 5.0.0-beta.6 (2017-09-03) they added new feature (accept object map for HttpClient headers & params)

Going forward the object can be passed directly instead of HttpParams.

getCountries(data: any) {
    // We don't need any more these lines
    // let httpParams = new HttpParams();
    // Object.keys(data).forEach(function (key) {
    //     httpParams = httpParams.append(key, data[key]);
    // });

    return this.httpClient.get("/api/countries", {params: data})
}

How to run certain task every day at a particular time using ScheduledExecutorService?

Just to add up on Victor's answer.

I would recommend to add a check to see, if the variable (in his case the long midnight) is higher than 1440. If it is, I would omit the .plusDays(1), otherwise the task will only run the day after tomorrow.

I did it simply like this:

Long time;

final Long tempTime = LocalDateTime.now().until(LocalDate.now().plusDays(1).atTime(7, 0), ChronoUnit.MINUTES);
if (tempTime > 1440) {
    time = LocalDateTime.now().until(LocalDate.now().atTime(7, 0), ChronoUnit.MINUTES);
} else {
    time = tempTime;
}

How to download image from url

Most of the posts that I found will timeout after a second iteration. Particularly if you are looping through a bunch if images as I have been. So to improve the suggestions above here is the entire method: 

public System.Drawing.Image DownloadImage(string imageUrl)
    {
        System.Drawing.Image image = null;

        try
        {
            System.Net.HttpWebRequest webRequest = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(imageUrl);
            webRequest.AllowWriteStreamBuffering = true;
            webRequest.Timeout = 30000;
            webRequest.ServicePoint.ConnectionLeaseTimeout = 5000;
            webRequest.ServicePoint.MaxIdleTime = 5000;

            using (System.Net.WebResponse webResponse = webRequest.GetResponse())
            {

                using (System.IO.Stream stream = webResponse.GetResponseStream())
                {
                    image = System.Drawing.Image.FromStream(stream);
                }
            }

            webRequest.ServicePoint.CloseConnectionGroup(webRequest.ConnectionGroupName);
            webRequest = null; 
        }
        catch (Exception ex)
        {
            throw new Exception(ex.Message, ex);

        }


        return image;
    }

laravel-5 passing variable to JavaScript

Standard PHP objects

The best way to provide PHP variables to JavaScript is json_encode. When using Blade you can do it like following:

<script>
    var bool = {!! json_encode($bool) !!};
    var int = {!! json_encode($int) !!};
    /* ... */
    var array = {!! json_encode($array_without_keys) !!};
    var object = {!! json_encode($array_with_keys) !!};
    var object = {!! json_encode($stdClass) !!};
</script>

There is also a Blade directive for decoding to JSON. I'm not sure since which version of Laravel but in 5.5 it is available. Use it like following:

<script>
    var array = @json($array);
</script>

Jsonable's

When using Laravel objects e.g. Collection or Model you should use the ->toJson() method. All those classes that implements the \Illuminate\Contracts\Support\Jsonable interface supports this method call. The call returns automatically JSON.

<script>
    var collection = {!! $collection->toJson() !!};
    var model = {!! $model->toJson() !!};
</script>

When using Model class you can define the $hidden property inside the class and those will be filtered in JSON. The $hidden property, as its name describs, hides sensitive content. So this mechanism is the best for me. Do it like following:

class User extends Model
{
    /* ... */

    protected $hidden = [
        'password', 'ip_address' /* , ... */
    ];

    /* ... */
}

And somewhere in your view

<script>
    var user = {!! $user->toJson() !!};
</script>

How to get a DOM Element from a JQuery Selector

If you need to interact directly with the DOM element, why not just use document.getElementById since, if you are trying to interact with a specific element you will probably know the id, as assuming that the classname is on only one element or some other option tends to be risky.

But, I tend to agree with the others, that in most cases you should learn to do what you need using what jQuery gives you, as it is very flexible.

UPDATE: Based on a comment: Here is a post with a nice explanation: http://www.mail-archive.com/[email protected]/msg04461.html

$(this).attr("checked") ? $(this).val() : 0

This will return the value if it's checked, or 0 if it's not.

$(this).val() is just reaching into the dom and getting the attribute "value" of the element, whether or not it's checked.

Using headers with the Python requests library's get method

Seems pretty straightforward, according to the docs on the page you linked (emphasis mine).

requests.get(url, params=None, headers=None, cookies=None, auth=None, timeout=None)

Sends a GET request. Returns Response object.

Parameters:

  • url – URL for the new Request object.
  • params – (optional) Dictionary of GET Parameters to send with the Request.
  • headers – (optional) Dictionary of HTTP Headers to send with the Request.
  • cookies – (optional) CookieJar object to send with the Request.
  • auth – (optional) AuthObject to enable Basic HTTP Auth.
  • timeout – (optional) Float describing the timeout of the request.

Bootstrap carousel width and height

I have created a responsive sample that works well for me and I find it to be quite simple have a look at my carousel-fill:

.carousel-fill {
    height: -o-calc(100vh - 165px) !important;
    height: -webkit-calc(100vh - 165px) !important;
    height: -moz-calc(100vh - 165px) !important;
    height: calc(100vh - 165px) !important;
    width: auto !important;
    overflow: hidden;
    display: inline-block;
    text-align: center;
}

.carousel-item {
    text-align: center !important;
}

my navigation height+footer are a hair less then 165px so that value works for me. take off a value that fits for you, I overrdide the .carousel-item from bootstrap so make sure by videos are centered.

my carousel looks like this, note the "carousel-fill" on the video tag.

<div>
        <div id="myCarousel" class="carousel slide carousel-fade text-center" data-ride="carousel">
            <!-- Indicators -->
            <ol class="carousel-indicators">
                <li data-target="#myCarousel" data-slide-to="0" class="active"></li>
                <li data-target="#myCarousel" data-slide-to="1"></li>
                <li data-target="#myCarousel" data-slide-to="2"></li>
                <li data-target="#myCarousel" data-slide-to="3"></li>
            </ol>

            <!-- Wrapper for slides -->
            <div class="carousel-inner">
                <div class="carousel-item active">
                    <video autoplay muted class="carousel-fill">
                        <source src="~/Video/CATSTrade.mp4" type="video/mp4">
                        Your browser does not support the video tag.
                    </video>
                    <div class="carousel-caption">
                        <h2>CATS IV Trade engine</h2>
                        <p>Automated trading for high ROI</p>
                    </div>
                </div>
                <div class="carousel-item">
                    <video muted loop class="carousel-fill">
                        <source src="~/Video/itrs.mp4" type="video/mp4">
                    </video>
                    <div class="carousel-caption">
                        <h2>Machine learning</h2>
                        <p>Machine learning specialist</p>
                    </div>
                </div>
                <div class="carousel-item">
                    <video muted loop class="carousel-fill">
                        <source src="~/Video/frequency.mp4" type="video/mp4">
                    </video>
                    <div class="carousel-caption">
                        <h3>Low latency development</h3>
                        <p>Create ultra fast systems with our consultants</p>
                    </div>
                </div>
                <div class="carousel-item">
                    <img src="~/Images/data pipeline faded.png" class="carousel-fill" />

                    <div class="carousel-caption">
                        <h3>Big Data</h3>
                        <p>Maintain, generate, and host big data</p>
                    </div>
                </div>
            </div>

            <!-- Left and right controls -->
            <a class="carousel-control-prev" href="#myCarousel" data-slide="prev">
                <span class="carousel-control-prev-icon" aria-hidden="true"></span>
                <span class="sr-only">Previous</span>
            </a>
            <a class="carousel-control-next" href="#myCarousel" data-slide="next">
                <span class="carousel-control-next-icon" aria-hidden="true"></span>
                <span class="sr-only">Next</span>
            </a>
        </div>
    </div>

in case some one needs to control the videos like i do, I start and stop the videos like this:

<script language="JavaScript" type="text/javascript">
        $(document).ready(function () {
            $('.carousel').carousel({ interval: 8000 })
            $('#myCarousel').on('slide.bs.carousel', function (args) {
                var videoList = document.getElementsByTagName("video");
                switch (args.from) {
                    case 0:
                        videoList[0].pause();
                        break;
                    case 1:
                        videoList[1].pause();
                        break;
                    case 2:
                        videoList[2].pause();
                        break;
                }
                switch (args.to) {
                    case 0:
                        videoList[0].play();

                        break;
                    case 1:
                        videoList[1].play();
                        break;
                    case 2:
                        videoList[2].play();
                        break;
                }
            })

        });
</script>

Can scrapy be used to scrape dynamic content from websites that are using AJAX?

Many times when crawling we run into problems where content that is rendered on the page is generated with Javascript and therefore scrapy is unable to crawl for it (eg. ajax requests, jQuery craziness).

However, if you use Scrapy along with the web testing framework Selenium then we are able to crawl anything displayed in a normal web browser.

Some things to note:

  • You must have the Python version of Selenium RC installed for this to work, and you must have set up Selenium properly. Also this is just a template crawler. You could get much crazier and more advanced with things but I just wanted to show the basic idea. As the code stands now you will be doing two requests for any given url. One request is made by Scrapy and the other is made by Selenium. I am sure there are ways around this so that you could possibly just make Selenium do the one and only request but I did not bother to implement that and by doing two requests you get to crawl the page with Scrapy too.

  • This is quite powerful because now you have the entire rendered DOM available for you to crawl and you can still use all the nice crawling features in Scrapy. This will make for slower crawling of course but depending on how much you need the rendered DOM it might be worth the wait.

    from scrapy.contrib.spiders import CrawlSpider, Rule
from scrapy.contrib.linkextractors.sgml import SgmlLinkExtractor
from scrapy.selector import HtmlXPathSelector
from scrapy.http import Request

from selenium import selenium

class SeleniumSpider(CrawlSpider):
    name = "SeleniumSpider"
    start_urls = ["http://www.domain.com"]

    rules = (
        Rule(SgmlLinkExtractor(allow=('\.html', )), callback='parse_page',follow=True),
    )

    def __init__(self):
        CrawlSpider.__init__(self)
        self.verificationErrors = []
        self.selenium = selenium("localhost", 4444, "*chrome", "http://www.domain.com")
        self.selenium.start()

    def __del__(self):
        self.selenium.stop()
        print self.verificationErrors
        CrawlSpider.__del__(self)

    def parse_page(self, response):
        item = Item()

        hxs = HtmlXPathSelector(response)
        #Do some XPath selection with Scrapy
        hxs.select('//div').extract()

        sel = self.selenium
        sel.open(response.url)

        #Wait for javscript to load in Selenium
        time.sleep(2.5)

        #Do some crawling of javascript created content with Selenium
        sel.get_text("//div")
        yield item

# Snippet imported from snippets.scrapy.org (which no longer works)
# author: wynbennett
# date  : Jun 21, 2011

Reference: http://snipplr.com/view/66998/

get everything between <tag> and </tag> with php

You can use the following:

$regex = '#<\s*?code\b[^>]*>(.*?)</code\b[^>]*>#s';
  • \b ensures that a typo (like <codeS>) is not captured.
  • The first pattern [^>]* captures the content of a tag with attributes (eg a class).
  • Finally, the flag s capture content with newlines.

See the result here : http://lumadis.be/regex/test_regex.php?id=1081

Difference between PACKETS and FRAMES

A packet is a general term for a formatted unit of data carried by a network. It is not necessarily connected to a specific OSI model layer.

For example, in the Ethernet protocol on the physical layer (layer 1), the unit of data is called an "Ethernet packet", which has an Ethernet frame (layer 2) as its payload. But the unit of data of the Network layer (layer 3) is also called a "packet".

A frame is also a unit of data transmission. In computer networking the term is only used in the context of the Data link layer (layer 2).

Another semantical difference between packet and frame is that a frame envelops your payload with a header and a trailer, just like a painting in a frame, while a packet usually only has a header.

But in the end they mean roughly the same thing and the distinction is used to avoid confusion and repetition when talking about the different layers.

“tag already exists in the remote" error after recreating the git tag

In Windows SourceTree, untick Push all tags to remotes.

enter image description here

NameError: global name 'xrange' is not defined in Python 3

in python 2.x, xrange is used to return a generator while range is used to return a list. In python 3.x , xrange has been removed and range returns a generator just like xrange in python 2.x. Therefore, in python 3.x you need to use range rather than xrange.

How can I add a box-shadow on one side of an element?

Just use ::after or ::before pseudo element to add the shadow. Make it 1px and position it on whatever side you want. Below is example of top.

_x000D_
_x000D_ 
footer {_x000D_
   margin-top: 50px;_x000D_
   color: #fff;_x000D_
   background-color: #009eff;_x000D_
   text-align: center;_x000D_
   line-height: 90px;_x000D_
   position: relative;_x000D_
}_x000D_
_x000D_
footer::after {_x000D_
    content: '';_x000D_
    position: absolute;_x000D_
    width: 100%;_x000D_
    height: 1px;_x000D_
    top: 0;_x000D_
    left: 0;_x000D_
    z-index: -1;_x000D_
    box-shadow: 0px 0px 10px 1px rgba(0, 0, 0, 0.75);_x000D_
}
_x000D_ 
<footer>top only box shadow</footer>
_x000D_
_x000D_
_x000D_

jQuery Ajax simple call

You could also make the ajax call more generic, reusable, so you can call it from different CRUD(create, read, update, delete) tasks for example and treat the success cases from those calls.

makePostCall = function (url, data) { // here the data and url are not hardcoded anymore
   var json_data = JSON.stringify(data);

    return $.ajax({
        type: "POST",
        url: url,
        data: json_data,
        dataType: "json",
        contentType: "application/json;charset=utf-8"
    });
}

// and here a call example
makePostCall("index.php?action=READUSERS", {'city' : 'Tokio'})
    .success(function(data){
               // treat the READUSERS data returned
   })
    .fail(function(sender, message, details){
           alert("Sorry, something went wrong!");
  });

Split Spark Dataframe string column into multiple columns

Here's another approach, in case you want split a string with a delimiter.

import pyspark.sql.functions as f

df = spark.createDataFrame([("1:a:2001",),("2:b:2002",),("3:c:2003",)],["value"])
df.show()
+--------+
|   value|
+--------+
|1:a:2001|
|2:b:2002|
|3:c:2003|
+--------+

df_split = df.select(f.split(df.value,":")).rdd.flatMap(
              lambda x: x).toDF(schema=["col1","col2","col3"])

df_split.show()
+----+----+----+
|col1|col2|col3|
+----+----+----+
|   1|   a|2001|
|   2|   b|2002|
|   3|   c|2003|
+----+----+----+

I don't think this transition back and forth to RDDs is going to slow you down... Also don't worry about last schema specification: it's optional, you can avoid it generalizing the solution to data with unknown column size.

Gradle to execute Java class (without modifying build.gradle)

Expanding on First Zero's answer, I'm guess you want something where you can also run gradle build without errors.

Both gradle build and gradle -PmainClass=foo runApp work with this:

task runApp(type:JavaExec) {
    classpath = sourceSets.main.runtimeClasspath

    main = project.hasProperty("mainClass") ? project.getProperty("mainClass") : "package.MyDefaultMain"
}

where you set your default main class.

get current date and time in groovy?

Date has the time as well, just add HH:mm:ss to the date format:

import java.text.SimpleDateFormat
def date = new Date()
def sdf = new SimpleDateFormat("MM/dd/yyyy HH:mm:ss")
println sdf.format(date)

In case you are using JRE 8 you can use LoaclDateTime:

import java.time.*

LocalDateTime t = LocalDateTime.now();
return t as String

On postback, how can I check which control cause postback in Page_Init event

To get exact name of control, use:

    string controlName = Page.FindControl(Page.Request.Params["__EVENTTARGET"]).ID;

Spring schemaLocation fails when there is no internet connection

The problem lies in the JAR files that you use in your application.

What I did, which worked, was to get inside the JARs for SPRING-CORE, SPRING-BEANS, SPRING-CONTEXT, SPRING-TX that match the version I am using. Within the META-INF folder, I concatenated all the spring.handlers and spring.schemas that come in those JARs.

I killed two birds with one stone, I solved the problem of the schemas so this also works correctly in offline mode.

P.S. I tried the maven plugin for SHADE and the transformers but that did not work.

How to process SIGTERM signal gracefully?

Here is a simple example without threads or classes.

import signal

run = True

def handler_stop_signals(signum, frame):
    global run
    run = False

signal.signal(signal.SIGINT, handler_stop_signals)
signal.signal(signal.SIGTERM, handler_stop_signals)

while run:
    pass # do stuff including other IO stuff

Insert picture into Excel cell

There is some faster way (https://www.youtube.com/watch?v=TSjEMLBAYVc):

  1. Insert image (Ctrl+V) to the excel.
  2. Validate "Picture Tools -> Align -> Snap To Grid" is checked
  3. Resize the image to fit the cell (or number of cells)
  4. Right-click on the image and check "Size and Properties... -> Properties -> Move and size with cells"

Serialize an object to XML

I will start with the copy answer of Ben Gripka:

public void Save(string FileName)
{
    using (var writer = new System.IO.StreamWriter(FileName))
    {
        var serializer = new XmlSerializer(this.GetType());
        serializer.Serialize(writer, this);
        writer.Flush();
    }
}

I used this code earlier. But reality showed that this solution is a bit problematic. Usually most of programmers just serialize setting on save and deserialize settings on load. This is an optimistic scenario. Once the serialization failed, because of some reason, the file is partly written, XML file is not complete and it is invalid. In consequence XML deserialization does not work and your application may crash on start. If the file is not huge, I suggest first serialize object to MemoryStream then write the stream to the File. This case is especially important if there is some complicated custom serialization. You can never test all cases.

public void Save(string fileName)
{
    //first serialize the object to memory stream,
    //in case of exception, the original file is not corrupted
    using (MemoryStream ms = new MemoryStream())
    {
        var writer = new System.IO.StreamWriter(ms);    
        var serializer = new XmlSerializer(this.GetType());
        serializer.Serialize(writer, this);
        writer.Flush();

        //if the serialization succeed, rewrite the file.
        File.WriteAllBytes(fileName, ms.ToArray());
    }
}

The deserialization in real world scenario should count with corrupted serialization file, it happens sometime. Load function provided by Ben Gripka is fine.

public static [ObjectType] Load(string fileName)
{
    using (var stream = System.IO.File.OpenRead(fileName))
    {
        var serializer = new XmlSerializer(typeof([ObjectType]));
        return serializer.Deserialize(stream) as [ObjectType];        
    }    
}

And it could be wrapped by some recovery scenario. It is suitable for settings files or other files which can be deleted in case of problems.

public static [ObjectType] LoadWithRecovery(string fileName)
{
    try
    {
        return Load(fileName);
    }
    catch(Excetion)
    {
        File.Delete(fileName); //delete corrupted settings file
        return GetFactorySettings();
    }
}

Align DIV to bottom of the page

Finally I found A good css that works!!! Without position: absolute;.

body {
    display:table;
    min-height: 100%;
}
.fixed-bottom {
  display:table-footer-group;
}

I have been looking for this for a long time! Hope this helps.

batch script - read line by line

Try this:

@echo off
for /f "tokens=*" %%a in (input.txt) do (
  echo line=%%a
)
pause

because of the tokens=* everything is captured into %a

edit: to reply to your comment, you would have to do that this way:

@echo off
for /f "tokens=*" %%a in (input.txt) do call :processline %%a

pause
goto :eof

:processline
echo line=%*

goto :eof

:eof

Because of the spaces, you can't use %1, because that would only contain the part until the first space. And because the line contains quotes, you can also not use :processline "%%a" in combination with %~1. So you need to use %* which gets %1 %2 %3 ..., so the whole line.

Does JavaScript have a built in stringbuilder class?

In C# you can do something like

 String.Format("hello {0}, your age is {1}.",  "John",  29)

In JavaScript you could do something like 

 var x = "hello {0}, your age is {1}";
 x = x.replace(/\{0\}/g, "John");
 x = x.replace(/\{1\}/g, 29);

What is the Java equivalent for LINQ?

An anonymous user mentioned another one, Diting:

Diting is a class library provides query capabilities on collections through chainable methods and anonymous interface like Linq in .NET. Unlike most of other collection library those are using static methods need iterate whole collection, Diting provides a core Enumerable class whitch contains deffered chainable methods to implement query on collection or array.

Supported Methods: any, cast, contact, contains, count, distinct, elementAt, except, first, firstOrDefault, groupBy, interset, join, last, lastOrDefault, ofType, orderBy, orderByDescending, reverse, select, selectMany, single, singleOrDefault, skip, skipWhile, take, takeWhile, toArray, toArrayList, union, where

How do you add a timed delay to a C++ program?

On Windows you can include the windows library and use "Sleep(0);" to sleep the program. It takes a value that represents milliseconds.

What is "Linting"?

Apart from what others have mentioned, I would like to add that, Linting will run through your source code to find

 -  formatting discrepancy 
 -  non-adherence to coding standards and conventions 
 -  pinpointing possible logical errors in your program

Running a Lint program over your source code, helps to ensure that source code is legible, readable, less polluted and easier to maintain.

NodeJs : TypeError: require(...) is not a function

Remember to export your routes.js.

In routes.js, write your routes and all your code in this function module:

exports = function(app, passport) {

/* write here your code */ 

}

How to enable TLS 1.2 in Java 7

I had similar issue when connecting to RDS Oracle even when client and server were both set to TLSv1.2 the certs was right and java was 1.8.0_141 So Finally I had to apply patch at Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy Files

After applying the patch the issue went away and connection went fine.

Catching multiple exception types in one catch block

Update:

As of PHP 7.1, this is available.

The syntax is:

try
{
    // Some code...
}
catch(AError | BError $e)
{
    // Handle exceptions
}
catch(Exception $e)
{
    // Handle the general case
}

Docs: https://www.php.net/manual/en/language.exceptions.php#example-294

RFC: https://wiki.php.net/rfc/multiple-catch

Commit: https://github.com/php/php-src/commit/0aed2cc2a440e7be17552cc669d71fdd24d1204a

For PHP before 7.1:

Despite what these other answers say, you can catch AError and BError in the same block (it is somewhat easier if you are the one defining the exceptions). Even given that there are exceptions you want to "fall through", you should still be able to define a hierarchy to match your needs.

abstract class MyExceptions extends Exception {}

abstract class LetterError extends MyExceptions {}

class AError extends LetterError {}

class BError extends LetterError {}

Then:

catch(LetterError $e){
    //voodoo
}

As you can see here and here, even the SPL default exceptions have a hierarchy you can leverage. Additionally, as stated in the PHP Manual:

When an exception is thrown, code following the statement will not be executed, and PHP will attempt to find the first matching catch block.

This means you could also have

class CError extends LetterError {}

which you need to handle differently than AError or BError, so your catch statement would look like this:

catch(CError $e){
    //voodoo
}
catch(LetterError $e){
    //voodoo
}

If you had the case where there were twenty or more exceptions that legitimately belonged under the same superclass, and you needed to handle five (or whatever large-ish group) of them one way and the rest the other, you can STILL do this.

interface Group1 {}

class AError extends LetterError implements Group1 {}

class BError extends LetterError implements Group1 {}

And then:

catch (Group1 $e) {}

Using OOP when it comes to exceptions is very powerful. Using things like get_class or instanceof are hacks, and should be avoided if possible.

Another solution I would like to add is putting the exception handling functionality in its own method.

You could have

function handleExceptionMethod1(Exception $e)
{
    //voodoo
}

function handleExceptionMethod2(Exception $e)
{
    //voodoo
}

Assuming there is absolutely no way you can control exception class hierarchies or interfaces (and there almost always will be a way), you can do the following:

try
{
    stuff()
}
catch(ExceptionA $e)
{
    $this->handleExceptionMethod1($e);
}
catch(ExceptionB $e)
{
    $this->handleExceptionMethod1($e);
}
catch(ExceptionC $e)
{
    $this->handleExceptionMethod1($e);
}
catch(Exception $e)
{
    $this->handleExceptionMethod2($e);
}

In this way, you are still have a only single code location you have to modify if your exception handling mechanism needs to change, and you are working within the general constructs of OOP.

Superscript in Python plots

Alternatively, in python 3.6+, you can generate Unicode superscript and copy paste that in your code:

ax1.set_ylabel('Rate (min?¹)')

What is the difference between `new Object()` and object literal notation?

2019 Update

I ran the same code as @rjloura on my OSX High Sierra 10.13.6 node version 10.13.0 and these are the results

console.log('Testing Array:');
console.time('using[]');
for(var i=0; i<200000000; i++){var arr = []};
console.timeEnd('using[]');

console.time('using new');
for(var i=0; i<200000000; i++){var arr = new Array};
console.timeEnd('using new');

console.log('Testing Object:');

console.time('using{}');
for(var i=0; i<200000000; i++){var obj = {}};
console.timeEnd('using{}');

console.time('using new');
for(var i=0; i<200000000; i++){var obj = new Object};
console.timeEnd('using new');


Testing Array:
using[]: 117.613ms
using new: 117.168ms
Testing Object:
using{}: 117.205ms
using new: 118.644ms

SQL Server 2008 - Help writing simple INSERT Trigger

You want to take advantage of the inserted logical table that is available in the context of a trigger. It matches the schema for the table that is being inserted to and includes the row(s) that will be inserted (in an update trigger you have access to the inserted and deleted logical tables which represent the the new and original data respectively.)

So to insert Employee / Department pairs that do not currently exist you might try something like the following.

CREATE TRIGGER trig_Update_Employee
ON [EmployeeResult]
FOR INSERT
AS
Begin
    Insert into Employee (Name, Department) 
    Select Distinct i.Name, i.Department 
    from Inserted i
    Left Join Employee e
    on i.Name = e.Name and i.Department = e.Department
    where e.Name is null
End

CFLAGS vs CPPFLAGS

The CPPFLAGS macro is the one to use to specify #include directories.

Both CPPFLAGS and CFLAGS work in your case because the make(1) rule combines both preprocessing and compiling in one command (so both macros are used in the command).

You don't need to specify . as an include-directory if you use the form #include "...". You also don't need to specify the standard compiler include directory. You do need to specify all other include-directories.

Eclipse No tests found using JUnit 5 caused by NoClassDefFoundError for LauncherFactory

You might be importing @Test from org.junit.Test, which is a JUnit 4 annotation. The Junit5 test runner will not discover it.

The Junit5 test runner will discover a test annotated with org.junit.jupiter.api.Test

Found the answer from Import org.junit.Test throws error as "No Test found with Test Runner "JUnit 5""

How to clear the text of all textBoxes in the form?

Try this:

var t = this.Controls.OfType<TextBox>().AsEnumerable<TextBox>();
foreach (TextBox item in t)
{
    item.Text = "";
}

Android: Create a toggle button with image and no text

I know this is a little late, however for anyone interested, I've created a custom component that is basically a toggle image button, the drawable can have states as well as the background

https://gist.github.com/akshaydashrath/9662072

Merging dictionaries in C#

The trivial solution would be:

using System.Collections.Generic;
...
public static Dictionary<TKey, TValue>
    Merge<TKey,TValue>(IEnumerable<Dictionary<TKey, TValue>> dictionaries)
{
    var result = new Dictionary<TKey, TValue>();
    foreach (var dict in dictionaries)
        foreach (var x in dict)
            result[x.Key] = x.Value;
    return result;
}

Cannot retrieve string(s) from preferences (settings)

All your exercise conditionals are separate and the else is only tied to the last if statement. Use else if to bind them all together in the way I believe you intend.

Bytes of a string in Java

According to How to convert Strings to and from UTF8 byte arrays in Java:

String s = "some text here";
byte[] b = s.getBytes("UTF-8");
System.out.println(b.length);

How to get attribute of element from Selenium?

You are probably looking for get_attribute(). An example is shown here as well

def test_chart_renders_from_url(self):
    url = 'http://localhost:8000/analyse/'
    self.browser.get(url)
    org = driver.find_element_by_id('org')
    # Find the value of org?
    val = org.get_attribute("attribute name")

Spring Boot - Error creating bean with name 'dataSource' defined in class path resource

Maybe you forgot the MySQL JDBC driver.

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.34</version>
</dependency>

Is __init__.py not required for packages in Python 3.3+

If you have setup.py in your project and you use find_packages() within it, it is necessary to have an __init__.py file in every directory for packages to be automatically found.

Packages are only recognized if they include an __init__.py file

UPD: If you want to use implicit namespace packages without __init__.py you just have to use find_namespace_packages() instead

Docs

What is the difference between Forking and Cloning on GitHub?

In a nutshell, "fork" creates a copy of the project hosted on your own GitHub account.

"Clone" uses git software on your computer to download the source code and it's entire version history unto that computer

To switch from vertical split to horizontal split fast in Vim

Ctrl-w followed by H, J, K or L (capital) will move the current window to the far left, bottom, top or right respectively like normal cursor navigation.

The lower case equivalents move focus instead of moving the window.

Initializing a member array in constructor initializer

C++98 doesn't provide a direct syntax for anything but zeroing (or for non-POD elements, value-initializing) the array. For that you just write C(): arr() {}.

I thing Roger Pate is wrong about the alleged limitations of C++0x aggregate initialization, but I'm too lazy to look it up or check it out, and it doesn't matter, does it? EDIT: Roger was talking about "C++03", I misread it as "C++0x". Sorry, Roger. ?

A C++98 workaround for your current code is to wrap the array in a struct and initialize it from a static constant of that type. The data has to reside somewhere anyway. Off the cuff it can look like this:

class C 
{
public:
    C() : arr( arrData ) {}

private:
     struct Arr{ int elem[3]; };
     Arr arr;
     static Arr const arrData;
};

C::Arr const C::arrData = {{1, 2, 3}};

How do I get the application exit code from a Windows command line?

It's worth noting that .BAT and .CMD files operate differently.

Reading https://ss64.com/nt/errorlevel.html it notes the following:

There is a key difference between the way .CMD and .BAT batch files set errorlevels:

An old .BAT batch script running the 'new' internal commands: APPEND, ASSOC, PATH, PROMPT, FTYPE and SET will only set ERRORLEVEL if an error occurs. So if you have two commands in the batch script and the first fails, the ERRORLEVEL will remain set even after the second command succeeds.

This can make debugging a problem BAT script more difficult, a CMD batch script is more consistent and will set ERRORLEVEL after every command that you run [source].

This was causing me no end of grief as I was executing successive commands, but the ERRORLEVEL would remain unchanged even in the event of a failure.

remove inner shadow of text input

Add border: none or border: 0 to remove border at all, or border: 1px solid #ccc to make border thin and flat.

To remove ghost padding in Firefox, you can use ::-moz-focus-inner:

::-moz-focus-inner {
    border: 0;
    padding: 0;
}

See live demo.

How do I start a program with arguments when debugging?

I came to this page because I have sensitive information in my command line parameters, and didn't want them stored in the code repository. I was using System Environment variables to hold the values, which could be set on each build or development machine as needed for each purpose. Environment Variable Expansion works great in Shell Batch processes, but not Visual Studio.

Visual Studio Start Options:

Visual Studio Start Options

However, Visual Studio wouldn't return the variable value, but the name of the variable.

Example of Issue:

Example of Error in Visual Studio

My final solution after trying several here on S.O. was to write a quick lookup for the Environment variable in my Argument Processor. I added a check for % in the incoming variable value, and if it's found, lookup the Environment Variable and replace the value. This works in Visual Studio, and in my Build Environment.

foreach (string thisParameter in args)
            {
                if (thisParameter.Contains("="))
                {
                    string parameter = thisParameter.Substring(0, thisParameter.IndexOf("="));
                    string value = thisParameter.Substring(thisParameter.IndexOf("=") + 1);

                    if (value.Contains("%"))
                    {   //Workaround for VS not expanding variables in debug
                        value = Environment.GetEnvironmentVariable(value.Replace("%", ""));
                    }

This allows me to use the same syntax in my sample batch files, and in debugging with Visual Studio. No account information or URLs saved in GIT.

Example Use in Batch

Batch File Example

how to configure apache server to talk to HTTPS backend server?

In my case, my server was configured to work only in https mode, and error occured when I try to access http mode. So changing http://my-service to https://my-service helped.

Google Maps API OVER QUERY LIMIT per second limit

Often when you need to show so many points on the map, you'd be better off using the server-side approach, this article explains when to use each:

Geocoding Strategies: https://developers.google.com/maps/articles/geocodestrat

The client-side limit is not exactly "10 requests per second", and since it's not explained in the API docs I wouldn't rely on its behavior.

How do I disable form resizing for users?

Use the FormBorderStyle property. Make it FixedSingle:

this.FormBorderStyle = FormBorderStyle.FixedSingle;

How do the post increment (i++) and pre increment (++i) operators work in Java?

In both cases it first calculates value, but in post-increment it holds old value and after calculating returns it

++a

  1. a = a + 1;
  2. return a;

a++

  1. temp = a;
  2. a = a + 1;
  3. return temp;

I want to delete all bin and obj folders to force all projects to rebuild everything

You could actually take the PS suggestion a little further and create a vbs file in the project directory like this:

Option Explicit
Dim oShell, appCmd
Set oShell  = CreateObject("WScript.Shell")
appCmd      = "powershell -noexit Get-ChildItem .\ -include bin,obj -Recurse | foreach ($_) { remove-item $_.fullname -Force -Recurse -WhatIf }"
oShell.Run appCmd, 4, false

For safety, I have included -WhatIf parameter, so remove it if you are satisfied with the list on the first run.

Get the system date and split day, month and year

You should use DateTime.TryParseExcact if you know the format, or if not and want to use the system settings DateTime.TryParse. And to print the date,DateTime.ToString with the right format in the argument. To get the year, month or day you have DateTime.Year, DateTime.Month or DateTime.Day.

See DateTime Structures in MSDN for additional references.

Reading file contents on the client-side in javascript in various browsers

Edited to add information about the File API

Since I originally wrote this answer, the File API has been proposed as a standard and implemented in most browsers (as of IE 10, which added support for FileReader API described here, though not yet the File API). The API is a bit more complicated than the older Mozilla API, as it is designed to support asynchronous reading of files, better support for binary files and decoding of different text encodings. There is some documentation available on the Mozilla Developer Network as well as various examples online. You would use it as follows:

var file = document.getElementById("fileForUpload").files[0];
if (file) {
    var reader = new FileReader();
    reader.readAsText(file, "UTF-8");
    reader.onload = function (evt) {
        document.getElementById("fileContents").innerHTML = evt.target.result;
    }
    reader.onerror = function (evt) {
        document.getElementById("fileContents").innerHTML = "error reading file";
    }
}

Original answer

There does not appear to be a way to do this in WebKit (thus, Safari and Chrome). The only keys that a File object has are fileName and fileSize. According to the commit message for the File and FileList support, these are inspired by Mozilla's File object, but they appear to support only a subset of the features.

If you would like to change this, you could always send a patch to the WebKit project. Another possibility would be to propose the Mozilla API for inclusion in HTML 5; the WHATWG mailing list is probably the best place to do that. If you do that, then it is much more likely that there will be a cross-browser way to do this, at least in a couple years time. Of course, submitting either a patch or a proposal for inclusion to HTML 5 does mean some work defending the idea, but the fact that Firefox already implements it gives you something to start with.

How to restart VScode after editing extension's config?

Execute the workbench.action.reloadWindow command.

There are some ways to do so:

  1. Open the command palette (Ctrl + Shift + P) and execute the command:

    >Reload Window

  2. Define a keybinding for the command (for example CTRL+F5) in keybindings.json:

    [
  {
    "key": "ctrl+f5",
    "command": "workbench.action.reloadWindow",
    "when": "editorTextFocus"
  }
]

PHP - remove <img> tag from string

Try dropping the \ in front of the >.

Edit: I just tested your regex and it works fine. This is what I used:

<?
    $content = "this is something with an <img src=\"test.png\"/> in it.";
    $content = preg_replace("/<img[^>]+\>/i", "(image) ", $content); 
    echo $content;
?>

The result is:

this is something with an (image)  in it.

How to set up ES cluster?

It is usually handled automatically.

If autodiscovery doesn't work. Edit the elastic search config file, by enabling unicast discovery

Node 1:

    cluster.name: mycluster
    node.name: "node1"
    node.master: true
    node.data: true
    discovery.zen.ping.multicast.enabled: false
    discovery.zen.ping.unicast.hosts: ["node1.example.com"]

Node 2:

    cluster.name: mycluster
    node.name: "node2"
    node.master: false
    node.data: true
    discovery.zen.ping.multicast.enabled: false
    discovery.zen.ping.unicast.hosts: ["node1.example.com"]

and so on for node 3,4,5. Make node 1 master, and the rest only as data nodes.

Edit: Please note that by ES rule, if you have N nodes, then by convention, N/2+1 nodes should be masters for fail-over mechanisms They may or may not be data nodes, though.

Also, in case auto-discovery doesn't work, most probable reason is because the network doesn't allow it (and therefore disabled). If too many auto-discovery pings take place across multiple servers, the resources to manage those pings will prevent other services from running correctly.

For ex, think of a 10,000 node cluster and all 10,000 nodes doing the auto-pings.

How to get image size (height & width) using JavaScript?

To get the natural height and width:

_x000D_
_x000D_ 
document.querySelector("img").naturalHeight;
document.querySelector("img").naturalWidth;
_x000D_ 
<img src="img.png">
_x000D_
_x000D_
_x000D_

And if you want to get style height and width:

_x000D_
_x000D_ 
document.querySelector("img").offsetHeight;
document.querySelector("img").offsetWidth;
_x000D_
_x000D_
_x000D_

Exception.Message vs Exception.ToString()

I'd say @Wim is right. You should use ToString() for logfiles - assuming a technical audience - and Message, if at all, to display to the user. One could argue that even that is not suitable for a user, for every exception type and occurance out there (think of ArgumentExceptions, etc.).

Also, in addition to the StackTrace, ToString() will include information you will not get otherwise. For example the output of fusion, if enabled to include log messages in exception "messages".

Some exception types even include additional information (for example from custom properties) in ToString(), but not in the Message.

jQuery Validation plugin: disable validation for specified submit buttons

I found that the most flexible way is to do use JQuery's:

event.preventDefault():

E.g. if instead of submitting I want to redirect, I can do:

$("#redirectButton").click(function( event ) {
    event.preventDefault();
    window.location.href='http://www.skip-submit.com';
});

or I can send the data to a different endpoint (e.g. if I want to change the action):

$("#saveButton").click(function( event ) {
    event.preventDefault();
    var postData = $('#myForm').serialize();
    var jqxhr = $.post('http://www.another-end-point.com', postData ,function() {
    }).done(function() {
        alert("Data sent!");
    }).fail(function(jqXHR, textStatus, errorThrown) {
        alert("Ooops, we have an error");
    })

Once you do 'event.preventDefault();' you bypass validation.

checked = "checked" vs checked = true

document.getElementById('myRadio') returns you the DOM element, i'll reference it as elem in this answer.

elem.checked accesses the property named checked of the DOM element. This property is always a boolean.

When writing HTML you use checked="checked" in XHTML; in HTML you can simply use checked. When setting the attribute (this is done via .setAttribute('checked', 'checked')) you need to provide a value since some browsers consider an empty value being non-existent.

However, since you have the DOM element you have no reason to set the attribute since you can simply use the - much more comfortable - boolean property for it. Since non-empty strings are considered true in a boolean context, setting elem.checked to 'checked' or anything else that is not a falsy value (even 'false' or '0') will check the checkbox. There is not reason not to use true and false though so you should stick with the proper values.

How to write a test which expects an Error to be thrown in Jasmine?

A more elegant solution than creating an anonymous function who's sole purpose is to wrap another, is to use es5's bind function. The bind function creates a new function that, when called, has its this keyword set to the provided value, with a given sequence of arguments preceding any provided when the new function is called.

Instead of:

expect(function () { parser.parse(raw, config); } ).toThrow("Parsing is not possible");

Consider:

expect(parser.parse.bind(parser, raw, config)).toThrow("Parsing is not possible");

The bind syntax allows you to test functions with different this values, and in my opinion makes the test more readable. See also: https://stackoverflow.com/a/13233194/1248889

How do you count the number of occurrences of a certain substring in a SQL varchar?

The Replace/Len test is cute, but probably very inefficient (especially in terms of memory). A simple function with a loop will do the job.

CREATE FUNCTION [dbo].[fn_Occurences] 
(
    @pattern varchar(255),
    @expression varchar(max)
)
RETURNS int
AS
BEGIN

    DECLARE @Result int = 0;

    DECLARE @index BigInt = 0
    DECLARE @patLen int = len(@pattern)

    SET @index = CHARINDEX(@pattern, @expression, @index)
    While @index > 0
    BEGIN
        SET @Result = @Result + 1;
        SET @index = CHARINDEX(@pattern, @expression, @index + @patLen)
    END

    RETURN @Result

END

What is the native keyword in Java for?

NATIVE is Non access modifier.it can be applied only to METHOD. It indicates the PLATFORM-DEPENDENT implementation of method or code.

How can I unstage my files again after making a local commit?

git reset --soft HEAD~1 should do what you want. After this, you'll have the first changes in the index (visible with git diff --cached), and your newest changes not staged. git status will then look like this:

# On branch master
# Changes to be committed:
#   (use "git reset HEAD <file>..." to unstage)
#
#       modified:   foo.java
#
# Changes not staged for commit:
#   (use "git add <file>..." to update what will be committed)
#   (use "git checkout -- <file>..." to discard changes in working directory)
#
#       modified:   foo.java
#

You can then do git add foo.java and commit both changes at once.

How to display multiple notifications in android

Simple notification_id needs to be changable.

Just create random number for notification_id.

    Random random = new Random();
    int m = random.nextInt(9999 - 1000) + 1000;

or you can use this method for creating random number as told by tieorange (this will never get repeated):

    int m = (int) ((new Date().getTime() / 1000L) % Integer.MAX_VALUE);

and replace this line to add parameter for notification id as to generate random number

    notificationManager.notify(m, notification);

MATLAB - multiple return values from a function?

Change the function that you get one single Result=[array, listp, freep]. So there is only one result to be displayed

How to create string with multiple spaces in JavaScript

With template literals, you can use multiple spaces or multi-line strings and string interpolation. Template Literals are a new ES2015 / ES6 feature that allows you to work with strings. The syntax is very simple, just use backticks instead of single or double quotes:

let a = `something                 something`;

and to make multiline strings just press enter to create a new line, with no special characters:

let a = `something 

    
                         something`;

The results are exactly the same as you write in the string.

github: server certificate verification failed

Try to connect to repositroy with url: http://github.com/<user>/<project>.git (http except https)

In your case you should clone like this: 

git clone http://github.com/<user>/<project>.git

How to automatically generate getters and setters in Android Studio

Using Alt+ Insert for Windows or Command+ N for Mac in the editor, you may easily generate getter and setter methods for any fields of your class. This has the same effect as using the Menu Bar -> Code -> Generate...

enter image description here

and then using shift or control button, select all the variables you need to add getters and setters

Updating address bar with new URL without hash or reloading the page

 
var newurl = window.location.protocol + "//" + window.location.host + window.location.pathname + '?foo=bar';
window.history.pushState({path:newurl},'',newurl);

Writing string to a file on a new line every time

If you use it extensively (a lot of written lines), you can subclass 'file':

class cfile(file):
    #subclass file to have a more convienient use of writeline
    def __init__(self, name, mode = 'r'):
        self = file.__init__(self, name, mode)

    def wl(self, string):
        self.writelines(string + '\n')

Now it offers an additional function wl that does what you want:

fid = cfile('filename.txt', 'w')
fid.wl('appends newline charachter')
fid.wl('is written on a new line')
fid.close()

Maybe I am missing something like different newline characters (\n, \r, ...) or that the last line is also terminated with a newline, but it works for me.

How to extract filename.tar.gz file

The other scenario you mush verify is that the file you're trying to unpack is not empty and is valid.

In my case I wasn't downloading the file correctly, after double check and I made sure I had the right file I could unpack it without any issues.

What's the difference between Invoke() and BeginInvoke()

Building on Jon Skeet's reply, there are times when you want to invoke a delegate and wait for its execution to complete before the current thread continues. In those cases the Invoke call is what you want.

In multi-threading applications, you may not want a thread to wait on a delegate to finish execution, especially if that delegate performs I/O (which could make the delegate and your thread block).

In those cases the BeginInvoke would be useful. By calling it, you're telling the delegate to start but then your thread is free to do other things in parallel with the delegate.

Using BeginInvoke increases the complexity of your code but there are times when the improved performance is worth the complexity.

Save the plots into a PDF

Never mind got the way to do it. 

def plotGraph(X,Y):
     fignum = random.randint(0,sys.maxint)
     fig = plt.figure(fignum)
     ### Plotting arrangements ###
     return fig

------ plotting module ------

----- mainModule ----

 import matplotlib.pyplot as plt
 ### tempDLStats, tempDLlabels are the argument
 plot1 = plotGraph(tempDLstats, tempDLlabels)
 plot2 = plotGraph(tempDLstats_1, tempDLlabels_1)
 plot3 = plotGraph(tempDLstats_2, tempDLlabels_2)
 plt.show()
 plot1.savefig('plot1.png')
 plot2.savefig('plot2.png')
 plot3.savefig('plot3.png')

----- mainModule -----

Error: request entity too large

I had the same error recently, and all the solutions I've found did not work.

After some digging, I found that setting app.use(express.bodyParser({limit: '50mb'})); did set the limit correctly.

When adding a console.log('Limit file size: '+limit); in node_modules/express/node_modules/connect/lib/middleware/json.js:46 and restarting node, I get this output in the console: 

Limit file size: 1048576
connect.multipart() will be removed in connect 3.0
visit https://github.com/senchalabs/connect/wiki/Connect-3.0 for alternatives
connect.limit() will be removed in connect 3.0
Limit file size: 52428800
Express server listening on port 3002

We can see that at first, when loading the connect module, the limit is set to 1mb (1048576 bytes). Then when I set the limit, the console.log is called again and this time the limit is 52428800 (50mb). However, I still get a 413 Request entity too large.

Then I added console.log('Limit file size: '+limit); in node_modules/express/node_modules/connect/node_modules/raw-body/index.js:10 and saw another line in the console when calling the route with a big request (before the error output) : 

Limit file size: 1048576

This means that somehow, somewhere, connect resets the limit parameter and ignores what we specified. I tried specifying the bodyParser parameters in the route definition individually, but no luck either.

While I did not find any proper way to set it permanently, you can "patch" it in the module directly. If you are using Express 3.4.4, add this at line 46 of node_modules/express/node_modules/connect/lib/middleware/json.js :

limit = 52428800; // for 50mb, this corresponds to the size in bytes

The line number might differ if you don't run the same version of Express. Please note that this is bad practice and it will be overwritten if you update your module.

So this temporary solution works for now, but as soon as a solution is found (or the module fixed, in case it's a module problem) you should update your code accordingly.

I have opened an issue on their GitHub about this problem.

[edit - found the solution]

After some research and testing, I found that when debugging, I added app.use(express.bodyParser({limit: '50mb'}));, but after app.use(express.json());. Express would then set the global limit to 1mb because the first parser he encountered when running the script was express.json(). Moving bodyParser above it did the trick.

That said, the bodyParser() method will be deprecated in Connect 3.0 and should not be used. Instead, you should declare your parsers explicitly, like so :

app.use(express.json({limit: '50mb'}));
app.use(express.urlencoded({limit: '50mb'}));

In case you need multipart (for file uploads) see this post.

[second edit]

Note that in Express 4, instead of express.json() and express.urlencoded(), you must require the body-parser module and use its json() and urlencoded() methods, like so:

var bodyParser = require('body-parser');
app.use(bodyParser.json({limit: '50mb'}));
app.use(bodyParser.urlencoded({limit: '50mb', extended: true}));

If the extended option is not explicitly defined for bodyParser.urlencoded(), it will throw a warning (body-parser deprecated undefined extended: provide extended option). This is because this option will be required in the next version and will not be optional anymore. For more info on the extended option, you can refer to the readme of body-parser.

[third edit]

It seems that in Express v4.16.0 onwards, we can go back to the initial way of doing this (thanks to @GBMan for the tip):

app.use(express.json({limit: '50mb'}));
app.use(express.urlencoded({limit: '50mb'}));

How to open, read, and write from serial port in C?

I wrote this a long time ago (from years 1985-1992, with just a few tweaks since then), and just copy and paste the bits needed into each project.

You must call cfmakeraw on a tty obtained from tcgetattr. You cannot zero-out a struct termios, configure it, and then set the tty with tcsetattr. If you use the zero-out method, then you will experience unexplained intermittent failures, especially on the BSDs and OS X. "Unexplained intermittent failures" include hanging in read(3).

#include <errno.h>
#include <fcntl.h> 
#include <string.h>
#include <termios.h>
#include <unistd.h>

int
set_interface_attribs (int fd, int speed, int parity)
{
        struct termios tty;
        if (tcgetattr (fd, &tty) != 0)
        {
                error_message ("error %d from tcgetattr", errno);
                return -1;
        }

        cfsetospeed (&tty, speed);
        cfsetispeed (&tty, speed);

        tty.c_cflag = (tty.c_cflag & ~CSIZE) | CS8;     // 8-bit chars
        // disable IGNBRK for mismatched speed tests; otherwise receive break
        // as \000 chars
        tty.c_iflag &= ~IGNBRK;         // disable break processing
        tty.c_lflag = 0;                // no signaling chars, no echo,
                                        // no canonical processing
        tty.c_oflag = 0;                // no remapping, no delays
        tty.c_cc[VMIN]  = 0;            // read doesn't block
        tty.c_cc[VTIME] = 5;            // 0.5 seconds read timeout

        tty.c_iflag &= ~(IXON | IXOFF | IXANY); // shut off xon/xoff ctrl

        tty.c_cflag |= (CLOCAL | CREAD);// ignore modem controls,
                                        // enable reading
        tty.c_cflag &= ~(PARENB | PARODD);      // shut off parity
        tty.c_cflag |= parity;
        tty.c_cflag &= ~CSTOPB;
        tty.c_cflag &= ~CRTSCTS;

        if (tcsetattr (fd, TCSANOW, &tty) != 0)
        {
                error_message ("error %d from tcsetattr", errno);
                return -1;
        }
        return 0;
}

void
set_blocking (int fd, int should_block)
{
        struct termios tty;
        memset (&tty, 0, sizeof tty);
        if (tcgetattr (fd, &tty) != 0)
        {
                error_message ("error %d from tggetattr", errno);
                return;
        }

        tty.c_cc[VMIN]  = should_block ? 1 : 0;
        tty.c_cc[VTIME] = 5;            // 0.5 seconds read timeout

        if (tcsetattr (fd, TCSANOW, &tty) != 0)
                error_message ("error %d setting term attributes", errno);
}


...
char *portname = "/dev/ttyUSB1"
 ...
int fd = open (portname, O_RDWR | O_NOCTTY | O_SYNC);
if (fd < 0)
{
        error_message ("error %d opening %s: %s", errno, portname, strerror (errno));
        return;
}

set_interface_attribs (fd, B115200, 0);  // set speed to 115,200 bps, 8n1 (no parity)
set_blocking (fd, 0);                // set no blocking

write (fd, "hello!\n", 7);           // send 7 character greeting

usleep ((7 + 25) * 100);             // sleep enough to transmit the 7 plus
                                     // receive 25:  approx 100 uS per char transmit
char buf [100];
int n = read (fd, buf, sizeof buf);  // read up to 100 characters if ready to read

The values for speed are B115200, B230400, B9600, B19200, B38400, B57600, B1200, B2400, B4800, etc. The values for parity are 0 (meaning no parity), PARENB|PARODD (enable parity and use odd), PARENB (enable parity and use even), PARENB|PARODD|CMSPAR (mark parity), and PARENB|CMSPAR (space parity).

"Blocking" sets whether a read() on the port waits for the specified number of characters to arrive. Setting no blocking means that a read() returns however many characters are available without waiting for more, up to the buffer limit.

Addendum:

CMSPAR is needed only for choosing mark and space parity, which is uncommon. For most applications, it can be omitted. My header file /usr/include/bits/termios.h enables definition of CMSPAR only if the preprocessor symbol __USE_MISC is defined. That definition occurs (in features.h) with

#if defined _BSD_SOURCE || defined _SVID_SOURCE
 #define __USE_MISC     1
#endif

The introductory comments of <features.h> says:

/* These are defined by the user (or the compiler)
   to specify the desired environment:

...
   _BSD_SOURCE          ISO C, POSIX, and 4.3BSD things.
   _SVID_SOURCE         ISO C, POSIX, and SVID things.
...
 */

Multi-statement Table Valued Function vs Inline Table Valued Function

Another case to use a multi line function would be to circumvent sql server from pushing down the where clause.

For example, I have a table with a table names and some table names are formatted like C05_2019 and C12_2018 and and all tables formatted that way have the same schema. I wanted to merge all that data into one table and parse out 05 and 12 to a CompNo column and 2018,2019 into a year column. However, there are other tables like ACA_StupidTable which I cannot extract CompNo and CompYr and would get a conversion error if I tried. So, my query was in two part, an inner query that returned only tables formatted like 'C_______' then the outer query did a sub-string and int conversion. ie Cast(Substring(2, 2) as int) as CompNo. All looks good except that sql server decided to put my Cast function before the results were filtered and so I get a mind scrambling conversion error. A multi statement table function may prevent that from happening, since it is basically a "new" table.

Store a cmdlet's result value in a variable in Powershell

Just access the Priority property of the object returned from the pipeline:

$var = (Get-WSManInstance -enumerate wmicimv2/win32_process).Priority

(This won't work if Get-WSManInstance returns multiple objects.2)

For the second question: to get two properties there are several options, problably the simplest is to have have one variable* containing an object with two separate properties:

$var = (Get-WSManInstance -enumerate wmicimv2/win32_process | select -first 1 Priority, ProcessID)

and then use, assuming only one process:

$var.Priority

and

$var.ProcessID

If there are multiple processes $var will be an array which you can index, so to get the properties of the first process (using the array literal syntax @(...) so it is always a collection1):

$var = @(Get-WSManInstance -enumerate wmicimv2/win32_process | select -first 1 Priority, ProcessID)

and then use:

$var[0].Priority
$var[0].ProcessID

1 PowerShell helpfully for the command line, but not so helpfully in scripts has some extra logic when assigning the result of a pipeline to a variable: if no objects are returned then set $null, if one is returned then that object is assigned, otherwise an array is assigned. Forcing an array returns an array with zero, one or more (respectively) elements.

2 This changes in PowerShell V3 (at the time of writing in Release Candidate), using a member property on an array of objects will return an array of the value of those properties.

Jquery function return value

The return statement you have is stuck in the inner function, so it won't return from the outer function. You just need a little more code:

function getMachine(color, qty) {
    var returnValue = null;
    $("#getMachine li").each(function() {
        var thisArray = $(this).text().split("~");
        if(thisArray[0] == color&& qty>= parseInt(thisArray[1]) && qty<= parseInt(thisArray[2])) {
            returnValue = thisArray[3];
            return false; // this breaks out of the each
        }
    });
    return returnValue;
}

var retval = getMachine(color, qty);

Adding three months to a date in PHP

Add nth Days, months and years

$n = 2;
for ($i = 0; $i <= $n; $i++){
    $d = strtotime("$i days");
    $x = strtotime("$i month");
    $y = strtotime("$i year");
    echo "Dates : ".$dates = date('d M Y', "+$d days");
    echo "<br>";
    echo "Months : ".$months = date('M Y', "+$x months");
    echo '<br>';
    echo "Years : ".$years = date('Y', "+$y years");
    echo '<br>';
}

Click events on Pie Charts in Chart.js

 
  var ctx = document.getElementById('pie-chart').getContext('2d');
 var myPieChart = new Chart(ctx, {
                // The type of chart we want to create
                type: 'pie',

            });

             //define click event
  $("#pie-chart").click(
            function (evt) {
                var activePoints = myPieChart.getElementsAtEvent(evt);
                var labeltag = activePoints[0]._view.label;

                      });

Angular - ng: command not found

 
>> npm uninstall -g angular-cli
>> npm uninstall -g @angular/cli

>> npm cache clean

Restart you machine

then >> npm install -g @angular/cli@latest

set Path : C:\Users\admin\AppData\Roaming\npm\node_modules@angular\cli

Hope you never get 'ng' not found

Break when a value changes using the Visual Studio debugger

Imagine you have a class called A with the following declaration.

class A  
{  
    public:  
        A();

    private:
        int m_value;
};

You want the program to stop when someone modifies the value of "m_value".

Go to the class definition and put a breakpoint in the constructor of A.

A::A()
{
    ... // set breakpoint here
}

Once we stopped the program:

Debug -> New Breakpoint -> New Data Breakpoint ...

Address: &(this->m_value)
Byte Count: 4 (Because int has 4 bytes)

Now, we can resume the program. The debugger will stop when the value is changed.

You can do the same with inherited classes or compound classes.

class B
{
   private:
       A m_a;
};

Address: &(this->m_a.m_value)

If you don't know the number of bytes of the variable you want to inspect, you can use the sizeof operator.

For example:

// to know the size of the word processor,  
// if you want to inspect a pointer.
int wordTam = sizeof (void* );

If you look at the "Call stack" you can see the function that changed the value of the variable.

How does setTimeout work in Node.JS?

setTimeout is a kind of Thread, it holds a operation for a given time and execute.

setTimeout(function,time_in_mills);

in here the first argument should be a function type; as an example if you want to print your name after 3 seconds, your code should be something like below.

setTimeout(function(){console.log('your name')},3000);

Key point to remember is, what ever you want to do by using the setTimeout method, do it inside a function. If you want to call some other method by parsing some parameters, your code should look like below:

setTimeout(function(){yourOtherMethod(parameter);},3000);

Angular2: custom pipe could not be found

 
import {CommonModule} from "@angular/common";

Adding this statement to the pipe module solved my problem.

How do I escape double quotes in attributes in an XML String in T-SQL?

tSql escapes a double quote with another double quote. So if you wanted it to be part of your sql string literal you would do this:

declare @xml xml 
set @xml = "<transaction><item value=""hi"" /></transaction>"

If you want to include a quote inside a value in the xml itself, you use an entity, which would look like this:

declare @xml xml
set @xml = "<transaction><item value=""hi &quot;mom&quot; lol"" /></transaction>"

JavaFX Panel inside Panel auto resizing

It is quite simple because you are using the FXMLBuilder.

Just follow these simple steps:

  1. Open FXML file into FXMLBuilder.
  2. Select the stack pane.
  3. Open the Layout tab [left side tab of FXMLBuilder].
  4. Set the sides value by which you want to compute the pane size during stage resize like TOP, LEFT, RIGHT, BOTTOM.

How do I set proxy for chrome in python webdriver?

I had an issue with the same thing. ChromeOptions is very weird because it's not integrated with the desiredcapabilities like you would think. I forget the exact details, but basically ChromeOptions will reset to default certain values based on whether you did or did not pass a desired capabilities dict.

I did the following monkey-patch that allows me to specify my own dict without worrying about the complications of ChromeOptions

change the following code in /selenium/webdriver/chrome/webdriver.py:

def __init__(self, executable_path="chromedriver", port=0,
             chrome_options=None, service_args=None,
             desired_capabilities=None, service_log_path=None, skip_capabilities_update=False):
    """
    Creates a new instance of the chrome driver.

    Starts the service and then creates new instance of chrome driver.

    :Args:
     - executable_path - path to the executable. If the default is used it assumes the executable is in the $PATH
     - port - port you would like the service to run, if left as 0, a free port will be found.
     - desired_capabilities: Dictionary object with non-browser specific
       capabilities only, such as "proxy" or "loggingPref".
     - chrome_options: this takes an instance of ChromeOptions
    """
    if chrome_options is None:
        options = Options()
    else:
        options = chrome_options

    if skip_capabilities_update:
        pass
    elif desired_capabilities is not None:
        desired_capabilities.update(options.to_capabilities())
    else:
        desired_capabilities = options.to_capabilities()

    self.service = Service(executable_path, port=port,
        service_args=service_args, log_path=service_log_path)
    self.service.start()

    try:
        RemoteWebDriver.__init__(self,
            command_executor=self.service.service_url,
            desired_capabilities=desired_capabilities)
    except:
        self.quit()
        raise 
    self._is_remote = False

all that changed was the "skip_capabilities_update" kwarg. Now I just do this to set my own dict:

capabilities = dict( DesiredCapabilities.CHROME )

if not "chromeOptions" in capabilities:
    capabilities['chromeOptions'] = {
        'args' : [],
        'binary' : "",
        'extensions' : [],
        'prefs' : {}
    }

capabilities['proxy'] = {
    'httpProxy' : "%s:%i" %(proxy_address, proxy_port),
    'ftpProxy' : "%s:%i" %(proxy_address, proxy_port),
    'sslProxy' : "%s:%i" %(proxy_address, proxy_port),
    'noProxy' : None,
    'proxyType' : "MANUAL",
    'class' : "org.openqa.selenium.Proxy",
    'autodetect' : False
}

driver = webdriver.Chrome( executable_path="path_to_chrome", desired_capabilities=capabilities, skip_capabilities_update=True )

ASP.NET Web Site or ASP.NET Web Application?

It depends on what you are developing.

A content-oriented website will have its content changing frequently and a Website is better for that.

An application tends to have its data stored in a database and its pages and code change rarely. In this case it's better to have a Web application where deployment of assemblies is much more controlled and has better support for unit testing.

Convert int to string?

Further on to @Xavier's response, here's a page that does speed comparisons between several different ways to do the conversion from 100 iterations up to 21,474,836 iterations.

It seems pretty much a tie between:

int someInt = 0;
someInt.ToString(); //this was fastest half the time
//and
Convert.ToString(someInt); //this was the fastest the other half the time

Force decimal point instead of comma in HTML5 number input (client-side)

As far as I understand it, the HTML5 input type="number always returns input.value as a string.

Apparently, input.valueAsNumber returns the current value as a floating point number. You could use this to return a value you want.

See http://diveintohtml5.info/forms.html#type-number

Which type of folder structure should be used with Angular 2?

I suggest the following structure, which might violate some existing conventions.

I was striving to reduce name redundancy in the path, and trying to keep naming short in general.

So there is no/app/components/home/home.component.ts|html|css.

Instead it looks like this:

|-- app
    |-- users
        |-- list.ts|html|css
        |-- form.ts|html|css
    |-- cars
        |-- list.ts|html|css
        |-- form.ts|html|css
        |-- configurator.ts|html|css
    |-- app.component.ts|html|css
    |-- app.module.ts
    |-- user.service.ts
    |-- car.service.ts
|-- index.html
|-- main.ts
|-- style.css

How to use ClassLoader.getResources() correctly?

There is no way to recursively search through the classpath. You need to know the Full pathname of a resource to be able to retrieve it in this way. The resource may be in a directory in the file system or in a jar file so it is not as simple as performing a directory listing of "the classpath". You will need to provide the full path of the resource e.g. '/com/mypath/bla.xml'.

For your second question, getResource will return the first resource that matches the given resource name. The order that the class path is searched is given in the javadoc for getResource.

Difference between getContext() , getApplicationContext() , getBaseContext() and "this"

Context provides information about the Actvity or Application to newly created components.

Relevant Context should be provided to newly created components (whether application context or activity context)

Since Activity is a subclass of Context, one can use this to get that activity's context

How to detect if CMD is running as Administrator/has elevated privileges?

Here's a simple method I've used on Windows 7 through Windows 10. Basically, I simply use the "IF EXIST" command to check for the Windows\System32\WDI\LogFiles folder. The WDI folder exists on every install of Windows from at least 7 onward, and it requires admin privileges to access. The WDI folder always has a LogFiles folder inside it. So, running "IF EXIST" on the WDI\LogFiles folder will return true if run as admin, and false if not run as admin. This can be used in a batch file to check privilege level, and branch to whichever commands you desire based on that result.

Here's a brief snippet of example code:

IF EXIST %SYSTEMROOT%\SYSTEM32\WDI\LOGFILES GOTO GOTADMIN
(Commands for running with normal privileges)

:GOTADMIN
(Commands for running with admin privileges)

Keep in mind that this method assumes the default security permissions have not been modified on the WDI folder (which is unlikely to happen in most situations, but please see caveat #2 below). Even in that case, it's simply a matter of modifying the code to check for a different common file/folder that requires admin access (System32\config\SAM may be a good alternate candidate), or you could even create your own specifically for that purpose.

There are two caveats about this method though:

  1. Disabling UAC will likely break it through the simple fact that everything would be run as admin anyway.

  2. Attempting to open the WDI folder in Windows Explorer and then clicking "Continue" when prompted will add permanent access rights for that user account, thus breaking my method. If this happens, it can be fixed by removing the user account from the WDI folder security permissions. If for any reason the user MUST be able to access the WDI folder with Windows Explorer, then you'd have to modify the code to check a different folder (as mentioned above, creating your own specifically for this purpose may be a good choice).

So, admittedly my method isn't perfect since it can be broken, but it's a relatively quick method that's easy to implement, is equally compatible with all versions of Windows 7, 8 and 10, and provided I stay mindful of the mentioned caveats has been 100% effective for me.

How to remove docker completely from ubuntu 14.04

@miyuru. As suggested by him run all the steps.

Ubuntu version 16.04

Still when I ran docker --version it was returning a version. So to uninstall it completely

Again run the dpkg -l | grep -i docker which will list package still there in system.

For example:

ii  docker-ce-cli      5:19.03.6~3-0~ubuntu-xenial               
amd64        Docker CLI: the open-source application container engine

Now remove them as show below :

sudo apt-get purge -y docker-ce-cli

sudo apt-get autoremove -y --purge docker-ce-cli

sudo apt-get autoclean

Hope this will resolve it, as it did in my case.

React Router with optional path parameter

Working syntax for multiple optional params:

<Route path="/section/(page)?/:page?/(sort)?/:sort?" component={Section} />

Now, url can be:

  1. /section
  2. /section/page/1
  3. /section/page/1/sort/asc

How to get the current location in Google Maps Android API v2?

The Google Maps API location now works, even has listeners, you can do it using that, for example:

private GoogleMap.OnMyLocationChangeListener myLocationChangeListener = new GoogleMap.OnMyLocationChangeListener() {
    @Override
    public void onMyLocationChange(Location location) {
        LatLng loc = new LatLng(location.getLatitude(), location.getLongitude());
        mMarker = mMap.addMarker(new MarkerOptions().position(loc));
        if(mMap != null){
            mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(loc, 16.0f));
        }
    }
};

and then set the listener for the map:

mMap.setOnMyLocationChangeListener(myLocationChangeListener);

This will get called when the map first finds the location.

No need for LocationService or LocationManager at all.

OnMyLocationChangeListener interface is deprecated. use com.google.android.gms.location.FusedLocationProviderApi instead. FusedLocationProviderApi provides improved location finding and power usage and is used by the "My Location" blue dot. See the MyLocationDemoActivity in the sample applications folder for example example code, or the Location Developer Guide.

Implementing a HashMap in C

The best approach depends on the expected key distribution and number of collisions. If relatively few collisions are expected, it really doesn't matter which method is used. If lots of collisions are expected, then which to use depends on the cost of rehashing or probing vs. manipulating the extensible bucket data structure.

But here is source code example of An Hashmap Implementation in C

Convert NSDate to NSString

swift 4 answer

static let dateformat: String = "yyyy-MM-dd'T'HH:mm:ss"
public static func stringTodate(strDate : String) -> Date
{

    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = dateformat
    let date = dateFormatter.date(from: strDate)
    return date!
}
public static func dateToString(inputdate : Date) -> String
{

    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = dateformat
    return formatter.string(from: inputdate)

}

How to build & install GLFW 3 and use it in a Linux project

Great guide, thank you. Given most instructions here, it almost built for me but I did have one remaining error.

/usr/bin/ld: //usr/local/lib/libglfw3.a(glx_context.c.o): undefined reference to symbol 'dlclose@@GLIBC_2.2.5'
//lib/x86_64-linux-gnu/libdl.so.2: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status

After searching for this error, I had to add -ldl to the command line.

g++ main.cpp -lglfw3 -lX11 -lXrandr -lXinerama -lXi -lXxf86vm -lXcursor -lGL -lpthread -ldl

Then the "hello GLFW" sample app compiled and linked.

I am pretty new to linux so I am not completely certain what exactly this extra library does... other than fix my linking error. I do see that cmd line switch in the post above, however.

Should a retrieval method return 'null' or throw an exception when it can't produce the return value?

That depends on your method. If you method is supposed to always return a valid object and none is found, throwing an exception is the way to go. If the method is just ment to return an object which might or might not be there (like perhaps a image on a contact person) you shouldn't raise an error.

You might also want to expose a method returning a boolean true/false if this method actually will return an object so you don't have to either a) check for null or b) catch an exception

File loading by getClass().getResource()

getClass().getResource() uses the class loader to load the resource. This means that the resource must be in the classpath to be loaded.

When doing it with Eclipse, everything you put in the source folder is "compiled" by Eclipse:

  • .java files are compiled into .class files that go the the bin directory (by default)
  • other files are copied to the bin directory (respecting the package/folder hirearchy)

When launching the program with Eclipse, the bin directory is thus in the classpath, and since it contains the Test.properties file, this file can be loaded by the class loader, using getResource() or getResourceAsStream().

If it doesn't work from the command line, it's thus because the file is not in the classpath.

Note that you should NOT do

FileInputStream inputStream = new FileInputStream(new File(getClass().getResource(url).toURI()));

to load a resource. Because that can work only if the file is loaded from the file system. If you package your app into a jar file, or if you load the classes over a network, it won't work. To get an InputStream, just use 

getClass().getResourceAsStream("Test.properties")

And finally, as the documentation indicates,

Foo.class.getResourceAsStream("Test.properties")

will load a Test.properties file located in the same package as the class Foo. 

Foo.class.getResourceAsStream("/com/foo/bar/Test.properties")

will load a Test.properties file located in the package com.foo.bar.

MySQL: can't access root account

You can use the init files. Check the MySQL official documentation on How to Reset the Root Password (including comments for alternative solutions).

So basically using init files, you can add any SQL queries that you need for fixing your access (such as GRAND, CREATE, FLUSH PRIVILEGES, etc.) into init file (any file).

Here is my example of recovering root account:

echo "CREATE USER 'root'@'localhost' IDENTIFIED BY 'root';" > your_init_file.sql
echo "GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' WITH GRANT OPTION;" >> your_init_file.sql 
echo "FLUSH PRIVILEGES;" >> your_init_file.sql

and after you've created your file, you can run:

killall mysqld
mysqld_safe --init-file=$PWD/your_init_file.sql

then to check if this worked, press Ctrl+Z and type: bg to run the process from the foreground into the background, then verify your access by:

mysql -u root -proot
mysql> show grants;
+-------------------------------------------------------------------------------------------------------------+
| Grants for root@localhost                                                                                   |
+-------------------------------------------------------------------------------------------------------------+
| GRANT USAGE ON *.* TO 'root'@'localhost' IDENTIFIED BY PASSWORD '*81F5E21E35407D884A6CD4A731AEBFB6AF209E1B' |

See also:

How do I read a date in Excel format in Python?

Here's the bare-knuckle no-seat-belts use-at-own-risk version:

import datetime

def minimalist_xldate_as_datetime(xldate, datemode):
    # datemode: 0 for 1900-based, 1 for 1904-based
    return (
        datetime.datetime(1899, 12, 30)
        + datetime.timedelta(days=xldate + 1462 * datemode)
        )

IOS 7 Navigation Bar text and arrow color

 
[[UINavigationBar appearance] setTitleTextAttributes:@{NSForegroundColorAttributeName : [UIColor whiteColor]}];

On linux SUSE or RedHat, how do I load Python 2.7

If you want to install Python 2.7 on Oracle Linux, you can proceed as follows:

Enable the Software Collection in /etc/yum.repos.d/public-yum-ol6.repo.

vim /etc/yum.repos.d/public-yum-ol6.repo

[public_ol6_software_collections] 
name=Software Collection Library release 1.2 packages for Oracle Linux 6 
(x86_64) 
baseurl=[http://yum.oracle.com/repo/OracleLinux/OL6/SoftwareCollections12/x86_64/][1] 
    gpgkey=file:[///etc/pki/rpm-gpg/RPM-GPG-KEY-oracle][2] 
    gpgcheck=1 
    enabled=1 <==============change from 0 to 1

After making this change to the yum repository you can simply run the yum command to install the Python:

yum install gcc libffi libffi-devel python27 python27-python-devel openssl-devel python27-MySQL-python

edit bash_profile with follow variables:

vim ~/.bash_profile
PATH=$PATH:$HOME/bin:/opt/rh/python27/root/usr/bin export PATH
LD_LIBRARY_PATH=/opt/rh/python27/root/usr/lib64 export LD_LIBRARY_PATH
PKG_CONFIG_PATH=/opt/rh/python27/root/usr/lib64/pkgconfig export PKG_CONFIG_PATH

Now you can use python2.7 and pip for install Python modules:

/opt/rh/python27/root/usr/bin/pip install pynacl
/opt/rh/python27/root/usr/bin/python2.7 --version

Python and JSON - TypeError list indices must be integers not str

I solved changing

readable_json['firstName']

by

readable_json[0]['firstName']

How to avoid soft keyboard pushing up my layout?

To solve this simply add android:windowSoftInputMode="stateVisible|adjustPan to that activity in android manifest file. for example

<activity 
    android:name="com.comapny.applicationname.activityname"
    android:screenOrientation="portrait"
    android:windowSoftInputMode="stateVisible|adjustPan"/>

Java2D: Increase the line width

You should use setStroke to set a stroke of the Graphics2D object.

The example at http://www.java2s.com gives you some code examples.

The following code produces the image below:

import java.awt.*;
import java.awt.geom.Line2D;
import javax.swing.*;

public class FrameTest {
    public static void main(String[] args) {
        JFrame jf = new JFrame("Demo");
        Container cp = jf.getContentPane();
        cp.add(new JComponent() {
            public void paintComponent(Graphics g) {
                Graphics2D g2 = (Graphics2D) g;
                g2.setStroke(new BasicStroke(10));
                g2.draw(new Line2D.Float(30, 20, 80, 90));
            }
        });
        jf.setSize(300, 200);
        jf.setVisible(true);
    }
}

enter image description here

(Note that the setStroke method is not available in the Graphics object. You have to cast it to a Graphics2D object.)

This post has been rewritten as an article here.

What is the parameter "next" used for in Express?

Next is used to pass control to the next middleware function. If not the request will be left hanging or open.

Make a table fill the entire window

You can use position like this to stretch an element across the parent container.

<table style="position: absolute; top: 0; bottom: 0; left: 0; right: 0;">
    <tr style="height: 25%; font-size: 180px;">
        <td>Region</td>
    </tr>
    <tr style="height: 75%; font-size: 540px;">
        <td>100.00%</td>
    </tr>
</table>

How to subtract n days from current date in java?

I found this perfect solution and may useful, You can directly get in format as you want:

Calendar cal = Calendar.getInstance();
cal.add(Calendar.DATE, -90); // I just want date before 90 days. you can give that you want.

SimpleDateFormat s = new SimpleDateFormat("yyyy-MM-dd"); // you can specify your format here...
Log.d("DATE","Date before 90 Days: " + s.format(new Date(cal.getTimeInMillis())));

Thanks.

How to sort a List<Object> alphabetically using Object name field

Using Java 8 Comparator.comparing:

list.sort(Comparator.comparing(Campaign::getName));

CSS Background Opacity

Just make sure to put width and height for the foreground the same with the background, or try to have top, bottom, left and right properties.

<style>
    .foreground, .background {
        position: absolute;
    }
    .foreground {
        z-index: 1;
    }
    .background {
        background-image: url(your/image/here.jpg);
        opacity: 0.4;
    }
</style>

<div class="foreground"></div>
<div class="background"></div>

When do I use the PHP constant "PHP_EOL"?

DOS/Windows standard "newline" is CRLF (= \r\n) and not LFCR (\n\r). If we put the latter, it's likely to produce some unexpected (well, in fact, kind of expected! :D) behaviors.

Nowadays almost all (well written) programs accept the UNIX standard LF (\n) for newline code, even mail sender daemons (RFC sets CRLF as newline for headers and message body).

regular expression for DOT

. matches any character so needs escaping i.e. \., or \\. within a Java string (because \ itself has special meaning within Java strings.)

You can then use \.\. or \.{2} to match exactly 2 dots.

What is the meaning of curly braces?

In languages like C curly braces ({}) are used to create program blocks used in flow control. In Python, curly braces are used to define a data structure called a dictionary (a key/value mapping), while white space indentation is used to define program blocks.

Possible reasons for timeout when trying to access EC2 instance

I was working on the instance and it was fine, the very next day when I tried to SSH into my instance it said - Connection timeout.

I tried to go through this post but nothing worked. So I did -

On the Edit inbound rules from source column choose MY IP and it will automatically populate your Public IP address in CIDR format (XXX.XXX.XXX.XX/32).

I tried with the @ted.strauss answer by giving local IP but it did not help in my case. So I choose MY IP and it worked.

Hope this helps someone!

All possible array initialization syntaxes

 
Enumerable.Repeat(String.Empty, count).ToArray()

Will create array of empty strings repeated 'count' times. In case you want to initialize array with same yet special default element value. Careful with reference types, all elements will refer same object.

How to get last items of a list in Python?

You can use negative integers with the slicing operator for that. Here's an example using the python CLI interpreter:

>>> a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]
>>> a
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]
>>> a[-9:]
[4, 5, 6, 7, 8, 9, 10, 11, 12]

the important line is a[-9:]

Mailbox unavailable. The server response was: 5.7.1 Unable to relay Error

The default configuration of most SMTP servers is not to relay from an untrusted source to outside domains. For example, imagine that you contact the SMTP server for foo.com and ask it to send a message to [email protected]. Because the SMTP server doesn't really know who you are, it will refuse to relay the message. If the server did do that for you, it would be considered an open relay, which is how spammers often do their thing.

If you contact the foo.com mail server and ask it to send mail to [email protected], it might let you do it. It depends on if they trust that you're who you say you are. Often, the server will try to do a reverse DNS lookup, and refuse to send mail if the IP you're sending from doesn't match the IP address of the MX record in DNS. So if you say that you're the bar.com mail server but your IP address doesn't match the MX record for bar.com, then it will refuse to deliver the message.

You'll need to talk to the administrator of that SMTP server to get the authentication information so that it will allow relay for you. You'll need to present those credentials when you contact the SMTP server. Usually it's either a user name/password, or it can use Windows permissions. Depends on the server and how it's configured.

See Unable to send emails to external domain using SMTP for an example of how to send the credentials.

What are the most-used vim commands/keypresses?

@Greg Hewgill's cheatsheet is very good. I started my switch from TextMate a few months ago. Now I'm as productive as I was with TM and constantly amazed by Vim's power.

Here is how I switched. Maybe it can be useful to you.

Grosso modo, I don't think it's a good idea to do a radical switch. Vim is very different and it's best to go progressively.

And to answer your subquestion, yes, I use all of iaIAoO everyday to enter insert mode. It certainly seems weird at first but you don't really think about it after a while.

Some commands incredibly useful for any programming related tasks:

  • r and R to replace characters
  • <C-a> and <C-x>to increase and decrease numbers
  • cit to change the content of an HTML tag, and its variants (cat, dit, dat, ci(, etc.)
  • <C-x><C-o> (mapped to ,,) for omnicompletion
  • visual block selection with <C-v>
  • and so on…

Once you are accustomed to the Vim way it becomes really hard to not hit o or x all the time when editing text in some other editor or textfield.

How to hide/show more text within a certain length (like youtube)

Show More, Show Less (Only when needed) No JQuery

I needed this functionality for an RSS feed on our company's website. This is what I came up with:

_x000D_
_x000D_ 
// Create Variables_x000D_
var allOSB = [];_x000D_
var mxh = '';_x000D_
_x000D_
window.onload = function() {_x000D_
  // Set Variables_x000D_
  allOSB = document.getElementsByClassName("only-so-big");_x000D_
  _x000D_
  if (allOSB.length > 0) {_x000D_
    mxh = window.getComputedStyle(allOSB[0]).getPropertyValue('max-height');_x000D_
    mxh = parseInt(mxh.replace('px', ''));_x000D_
    _x000D_
    // Add read-more button to each OSB section_x000D_
    for (var i = 0; i < allOSB.length; i++) {_x000D_
      var el = document.createElement("button");_x000D_
      el.innerHTML = "Read More";_x000D_
      el.setAttribute("type", "button");_x000D_
      el.setAttribute("class", "read-more hid");_x000D_
      _x000D_
      insertAfter(allOSB[i], el);_x000D_
    }_x000D_
  }_x000D_
_x000D_
  // Add click function to buttons_x000D_
  var readMoreButtons = document.getElementsByClassName("read-more");_x000D_
  for (var i = 0; i < readMoreButtons.length; i++) {_x000D_
    readMoreButtons[i].addEventListener("click", function() { _x000D_
      revealThis(this);_x000D_
    }, false);_x000D_
  }_x000D_
  _x000D_
  // Update buttons so only the needed ones show_x000D_
  updateReadMore();_x000D_
}_x000D_
// Update on resize_x000D_
window.onresize = function() {_x000D_
  updateReadMore();_x000D_
}_x000D_
_x000D_
// show only the necessary read-more buttons_x000D_
function updateReadMore() {_x000D_
  if (allOSB.length > 0) {_x000D_
    for (var i = 0; i < allOSB.length; i++) {_x000D_
      if (allOSB[i].scrollHeight > mxh) {_x000D_
        if (allOSB[i].hasAttribute("style")) {_x000D_
          updateHeight(allOSB[i]);_x000D_
        }_x000D_
        allOSB[i].nextElementSibling.className = "read-more";_x000D_
      } else {_x000D_
        allOSB[i].nextElementSibling.className = "read-more hid";_x000D_
      }_x000D_
    }_x000D_
  }_x000D_
}_x000D_
_x000D_
function revealThis(current) {_x000D_
  var el = current.previousElementSibling;_x000D_
  if (el.hasAttribute("style")) {_x000D_
    current.innerHTML = "Read More";_x000D_
    el.removeAttribute("style");_x000D_
  } else {_x000D_
    updateHeight(el);_x000D_
    current.innerHTML = "Show Less";_x000D_
  }_x000D_
}_x000D_
_x000D_
function updateHeight(el) {_x000D_
  el.style.maxHeight = el.scrollHeight + "px";_x000D_
}_x000D_
_x000D_
// thanks to karim79 for this function_x000D_
// http://stackoverflow.com/a/4793630/5667951_x000D_
function insertAfter(referenceNode, newNode) {_x000D_
    referenceNode.parentNode.insertBefore(newNode, referenceNode.nextSibling);_x000D_
}
_x000D_ 
@import url('https://fonts.googleapis.com/css?family=Open+Sans:600');_x000D_
_x000D_
*,_x000D_
*:before,_x000D_
*:after {_x000D_
  box-sizing: border-box;_x000D_
}_x000D_
html,_x000D_
body {_x000D_
  height: 100%;_x000D_
  margin: 0;_x000D_
  padding: 0;_x000D_
  width: 100%;_x000D_
}_x000D_
body {_x000D_
  font-family: 'Open Sans', sans-serif;_x000D_
}_x000D_
h1 {_x000D_
  text-align: center;_x000D_
}_x000D_
.main-container {_x000D_
  margin: 30px auto;_x000D_
  max-width: 1000px;_x000D_
  padding: 20px;_x000D_
}_x000D_
.only-so-big p {_x000D_
  padding: 0;_x000D_
  margin: 0;_x000D_
}_x000D_
p {_x000D_
  font-size: 15px;_x000D_
  line-height: 20px;_x000D_
}_x000D_
hr {_x000D_
  background: #ccc;_x000D_
  display: block;_x000D_
  height: 1px;_x000D_
  width: 100%;_x000D_
}_x000D_
_x000D_
_x000D_
/*_x000D_
  NECESSARY SECTION_x000D_
*/_x000D_
.only-so-big {_x000D_
  background: rgba(178, 252, 255, .3);_x000D_
  height: 100%;_x000D_
  max-height: 100px;_x000D_
  overflow: hidden;_x000D_
  -webkit-transition: max-height .75s;_x000D_
  transition: max-height .75s;_x000D_
}_x000D_
_x000D_
.read-more {_x000D_
  background: none;_x000D_
  border: none;_x000D_
  color: #1199f9;_x000D_
  cursor: pointer;_x000D_
  font-size: 1em;_x000D_
  outline: none; _x000D_
}_x000D_
.read-more:hover {_x000D_
  text-decoration: underline;_x000D_
}_x000D_
.read-more:focus {_x000D_
  outline: none;_x000D_
}_x000D_
.read-more::-moz-focus-inner {_x000D_
  border: 0;_x000D_
}_x000D_
.hid {_x000D_
  display: none;_x000D_
}
_x000D_ 
<div class="main-container">_x000D_
      <h1>Controlling Different Content Size</h1>_x000D_
      <p>We're working with an RSS feed and have had issues with some being much larger than others (content wise). I only want to show the "Read More" button if it's needed.</p>_x000D_
      <div class="only-so-big">_x000D_
        <p>This is just a short guy. No need for the read more button.</p>_x000D_
      </div>_x000D_
      <hr>_x000D_
      <div class="only-so-big">_x000D_
        <p>This one has way too much content to show. Best be saving it for those who want to read everything in here.</p>_x000D_
        <p>Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae vitae dicta sunt explicabo. Nemo enim ipsam voluptatem quia_x000D_
          voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit, sed quia non numquam eius modi THE END!</p>_x000D_
      </div>_x000D_
      <hr>_x000D_
      <div class="only-so-big">_x000D_
        <p>Another small section with not a lot of content</p>_x000D_
      </div>_x000D_
      <hr>_x000D_
      <div class="only-so-big">_x000D_
        <p>Make Window smaller to show "Read More" button.<br> totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae vitae dicta sunt explicabo. Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed?</p>_x000D_
      </div>_x000D_
    </div>
_x000D_
_x000D_
_x000D_

Merge (with squash) all changes from another branch as a single commit

git merge --squash <feature branch> is a good option .The "git commit" tells you all feature branch commit message with your choice to keep it .

For less commit merge .

git merge do x times --git reset HEAD^ --soft then git commit .

Risk - deleted files may come back .

Resize svg when window is resized in d3.js

_x000D_
_x000D_ 
d3.select("div#chartId")
   .append("div")
   // Container class to make it responsive.
   .classed("svg-container", true) 
   .append("svg")
   // Responsive SVG needs these 2 attributes and no width and height attr.
   .attr("preserveAspectRatio", "xMinYMin meet")
   .attr("viewBox", "0 0 600 400")
   // Class to make it responsive.
   .classed("svg-content-responsive", true)
   // Fill with a rectangle for visualization.
   .append("rect")
   .classed("rect", true)
   .attr("width", 600)
   .attr("height", 400);
_x000D_ 
.svg-container {
  display: inline-block;
  position: relative;
  width: 100%;
  padding-bottom: 100%; /* aspect ratio */
  vertical-align: top;
  overflow: hidden;
}
.svg-content-responsive {
  display: inline-block;
  position: absolute;
  top: 10px;
  left: 0;
}

svg .rect {
  fill: gold;
  stroke: steelblue;
  stroke-width: 5px;
}
_x000D_ 
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/5.7.0/d3.min.js"></script>

<div id="chartId"></div>
_x000D_
_x000D_
_x000D_

C# HttpWebRequest The underlying connection was closed: An unexpected error occurred on a send

In 4.0 version of the .Net framework the ServicePointManager.SecurityProtocol only offered two options to set:

  • Ssl3: Secure Socket Layer (SSL) 3.0 security protocol.
  • Tls: Transport Layer Security (TLS) 1.0 security protocol

In the next release of the framework the SecurityProtocolType enumerator got extended with the newer Tls protocols, so if your application can use th 4.5 version you can also use:

  • Tls11: Specifies the Transport Layer Security (TLS) 1.1 security protocol
  • Tls12: Specifies the Transport Layer Security (TLS) 1.2 security protocol.

So if you are on .Net 4.5 change your line 

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;

to 

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

so that the ServicePointManager will create streams that support Tls12 connections.

Do notice that the enumeration values can be used as flags so you can combine multiple protocols with a logical OR

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls | 
                                       SecurityProtocolType.Tls11 |
                                       SecurityProtocolType.Tls12;

Note
Try to keep the number of protocols you support as low as possible and up-to-date with today security standards. Ssll3 is no longer deemed secure and the usage of Tls1.0 SecurityProtocolType.Tls is in decline.

How can I create a small color box using html and css?

If you want to create a small dots, just use icon from font awesome.

fa fa-circle

Set a request header in JavaScript

W3C Spec on setrequestheader.

The brief points:

If the request header had already been set, then the new value MUST be concatenated to the existing value using a U+002C COMMA followed by a U+0020 SPACE for separation.

UAs MAY give the User-Agent header an initial value, but MUST allow authors to append values to it.

However - After searching through the framework XHR in jQuery they don't allow you to change the User-Agent or Referer headers. The closest thing:

// Set header so the called script knows that it's an XMLHttpRequest
xhr.setRequestHeader("X-Requested-With", "XMLHttpRequest");

I'm leaning towards the opinion that what you want to do is being denied by a security policy in FF - if you want to pass some custom Referer type header you could always do:

xhr.setRequestHeader('X-Alt-Referer', 'http://www.google.com');

How to convert LINQ query result to List?

You need to somehow convert each tbcourse object to an instance of course. For instance course could have a constructor that takes a tbcourse. You could then write the query like this:

var qry = from c in obj.tbCourses
          select new course(c);

List<course> lst = qry.ToList();

Failed to find Build Tools revision 23.0.1

While running react-native In case you have installed 23.0.3 and it is asking for 23.0.1 simply in your application project directory. Open anroid/app/build.gradle and change buildToolsVersion "23.0.3"

enter image description here

Setting a minimum/maximum character count for any character using a regular expression

Like this: .

The . means any character except newline (which sometimes is but often isn't included, check your regex flavour).

You can rewrite your expression as ^.{1,35}$, which should match any line of length 1-35.

jquery live hover

WARNING: There is a significant performance penalty with the live version of hover. It's especially noticeable in a large page on IE8.

I am working on a project where we load multi-level menus with AJAX (we have our reasons :). Anyway, I used the live method for the hover which worked great on Chrome (IE9 did OK, but not great). However, in IE8 It not only slowed down the menus (you had to hover for a couple seconds before it would drop), but everything on the page was painfully slow, including scrolling and even checking simple checkboxes.

Binding the events directly after they loaded resulted in adequate performance.

MySQL: determine which database is selected?

Another way for filtering the database with specific word.

SHOW DATABASES WHERE `Database` LIKE '<yourDatabasePrefixHere>%'
or
SHOW DATABASES LIKE '<yourDatabasePrefixHere>%';

Example:

SHOW DATABASES WHERE `Database` LIKE 'foobar%'
foobar_animal
foobar_humans_gender
foobar_objects

Why javascript getTime() is not a function?

To use this function/method,you need an instance of the class Date .

This method is always used in conjunction with a Date object.

See the code below :

var d = new Date();
d.getTime();

Link : http://www.w3schools.com/jsref/jsref_getTime.asp

Adjust list style image position?

Here's what I did to get small grey blocks to be on the left side and in the center of the text with an increased lineheight:

line-height:200%;
padding-left:13px;
background-image:url('images/greyblock.gif');
background-repeat:no-repeat;
background-position:left center;

Hope this helps someone :D

How can I create a dynamically sized array of structs?

Another option for you is a linked list. You'll need to analyze how your program will use the data structure, if you don't need random access it could be faster than reallocating.

golang why don't we have a set datastructure

Like Vatine wrote: Since go lacks generics it would have to be part of the language and not the standard library. For that you would then have to pollute the language with keywords set, union, intersection, difference, subset...

The other reason is, that it's not clear at all what the "right" implementation of a set is:

  1. There is a functional approach:

    func IsInEvenNumbers(n int) bool {
    if n % 2 == 0 {
        return true
    }
   return false
}

This is a set of all even ints. It has a very efficient lookup and union, intersect, difference and subset can easily be done by functional composition.

  1. Or you do a has-like approach like Dali showed.

A map does not have that problem, since you store something associated with the value.

How to use cURL in Java?

Use Runtime to call Curl. This code works for both Ubuntu and Windows.

String[] commands = new String {"curl", "-X", "GET", "http://checkip.amazonaws.com"};
Process process = Runtime.getRuntime().exec(commands);
BufferedReader reader = new BufferedReader(new 
InputStreamReader(process.getInputStream()));
String line;
String response;
while ((line = reader.readLine()) != null) {
    response.append(line);
}

How can I switch to another branch in git?

If another_branch already exists locally and you are not on this branch, then git checkout another_branch switches to the branch.

If another_branch does not exist but origin/another_branch does, then git checkout another_branch is equivalent to git checkout -b another_branch origin/another_branch; git branch -u origin/another_branch. That's to create another_branch from origin/another_branch and set origin/another_branch as the upstream of another_branch.

If neither exists, git checkout another_branch returns error.

git checkout origin another_branch returns error in most cases. If origin is a revision and another_branch is a file, then it checks out the file of that revision but most probably that's not what you expect. origin is mostly used in git fetch, git pull and git push as a remote, an alias of the url to the remote repository.

git checkout origin/another_branch succeeds if origin/another_branch exists. It leads to be in detached HEAD state, not on any branch. If you make new commits, the new commits are not reachable from any existing branches and none of the branches will be updated.

UPDATE:

As 2.23.0 has been released, with it we can also use git switch to create and switch branches.

If foo exists, try to switch to foo:

git switch foo

If foo does not exist and origin/foo exists, try to create foo from origin/foo and then switch to foo:

git switch -c foo origin/foo
# or simply
git switch foo

More generally, if foo does not exist, try to create foo from a known ref or commit and then switch to foo:

git switch -c foo <ref>
git switch -c foo <commit>

If we maintain a repository in Gitlab and Github at the same time, the local repository may have two remotes, for example, origin for Gitlab and github for Github. In this case the repository has origin/foo and github/foo. git switch foo will complain fatal: invalid reference: foo, because it does not known from which ref, origin/foo or github/foo, to create foo. We need to specify it with git switch -c foo origin/foo or git switch -c foo github/foo according to the need. If we want to create branches from both remote branches, it's better to use distinguishing names for the new branches:

git switch -c gitlab_foo origin/foo
git switch -c github_foo github/foo

If foo exists, try to recreate/force-create foo from (or reset foo to) a known ref or commit and then switch to foo:

git switch -C foo <ref>
git switch -C foo <commit>

which are equivalent to:

git switch foo
git reset [<ref>|<commit>] --hard

Try to switch to a detached HEAD of a known ref or commit:

git switch -d <ref>
git switch -d <commit>

If you just want to create a branch but not switch to it, use git branch instead. Try to create a branch from a known ref or commit:

git branch foo <ref>
git branch foo <commit>

How to efficiently calculate a running standard deviation?

Here is a literal pure Python translation of the Welford's algorithm implementation from http://www.johndcook.com/standard_deviation.html:

https://github.com/liyanage/python-modules/blob/master/running_stats.py

import math

class RunningStats:

    def __init__(self):
        self.n = 0
        self.old_m = 0
        self.new_m = 0
        self.old_s = 0
        self.new_s = 0

    def clear(self):
        self.n = 0

    def push(self, x):
        self.n += 1

        if self.n == 1:
            self.old_m = self.new_m = x
            self.old_s = 0
        else:
            self.new_m = self.old_m + (x - self.old_m) / self.n
            self.new_s = self.old_s + (x - self.old_m) * (x - self.new_m)

            self.old_m = self.new_m
            self.old_s = self.new_s

    def mean(self):
        return self.new_m if self.n else 0.0

    def variance(self):
        return self.new_s / (self.n - 1) if self.n > 1 else 0.0

    def standard_deviation(self):
        return math.sqrt(self.variance())

Usage:

rs = RunningStats()
rs.push(17.0)
rs.push(19.0)
rs.push(24.0)

mean = rs.mean()
variance = rs.variance()
stdev = rs.standard_deviation()

print(f'Mean: {mean}, Variance: {variance}, Std. Dev.: {stdev}')

What is the difference between HTML tags and elements?

http://html.net/tutorials/html/lesson3.php

Tags are labels you use to mark up the begining and end of an element.

All tags have the same format: they begin with a less-than sign "<" and end with a greater-than sign ">".

Generally speaking, there are two kinds of tags - opening tags: <html> and closing tags: </html>. The only difference between an opening tag and a closing tag is the forward slash "/". You label content by putting it between an opening tag and a closing tag.

HTML is all about elements. To learn HTML is to learn and use different tags.

For example:

<h1></h1>

Where as elements are something that consists of start tag and end tag as shown:

<h1>Heading</h1>

How to produce an csv output file from stored procedure in SQL Server

Found a really helpful link for that. Using SQLCMD for this is really easier than solving this with a stored procedure

http://www.excel-sql-server.com/sql-server-export-to-excel-using-bcp-sqlcmd-csv.htm

Expand a random range from 1–5 to 1–7

Here is a working Python implementation of Adam's answer.

import random

def rand5():
    return random.randint(1, 5)

def rand7():
    while True:
        r = 5 * (rand5() - 1) + rand5()
        #r is now uniformly random between 1 and 25
        if (r <= 21):
            break
    #result is now uniformly random between 1 and 7
    return r % 7 + 1

I like to throw algorithms I'm looking at into Python so I can play around with them, thought I'd post it here in the hopes that it is useful to someone out there, not that it took long to throw together.

Get user's non-truncated Active Directory groups from command line

Based on answer by P.Brian.Mackey-- I tried using gpresult /user <UserName> /r command, but it only seemed to work for my user account; for other users accounts I got this result: The user "userNameHere" does not have RSOP data.

So I read through this blog-- https://blog.thesysadmins.co.uk/group-policy-gpresult-examples.html-- and came upon a solution. You have to know the users computer name: 

gpresult /s <UserComputer> /r /user:<UserName>

After running the command, you have to ENTER a few times for the program to complete because it will pause in the middle of the ouput. Also, the results gave a bunch of data including a section for "COMPUTER SETTINGS> Applied Group Policy Objects" and then "COMPUTER SETTINGS> Security groups" and finally "USER SETTINGS> security groups" (this is what we are looking for with the AD groups listed with non-truncated descriptions!).

Interesting to note that GPRESULT had some extra members not seen in NET USER command. Also, the sort order does not match and is not alphabetical. Any body who can add more insights in the comments that would be great.

RESULTS: gpresult (with ComputerName, UserName)

For security reasons, I have included only a subset of the membership results. (36 TOTAL, 12 SAMPLE)

The user is a part of the following security groups
---------------------------------------------------
..
 Internet Email 
 GEVStandardPSMViewers  
 GcoFieldServicesEditors    
 AnimalWelfare_Readers  
 Business Objects   
 Zscaler_Standard_Access    
..
 GCM    
..
 GcmSharesEditors   
 GHVStandardPSMViewers  
 IntranetReportsViewers 
 JetDWUsers     -- (NOTE: this one was deleted today, the other "Jet" one was added)
..
 Time and Attendance Users  
..

RESULTS: net user /DOMAIN (with UserName)

For security reasons, I have included only a subset of the membership results. (23 TOTAL, 12 SAMPLE)

Local Group Memberships  
Global Group memberships    ...
                             *Internet Email       *GEVStandardPSMViewers
                             *GcoFieldServicesEdito*AnimalWelfare_Readers
                             *Business Objects     *Zscaler_Standard_Acce
                             ...
                             *Time and Attendance U*GCM
                             ...
                             *GcmSharesEditors     *GHVStandardPSMViewers
                             *IntranetReportsViewer*JetPowerUsers
The command completed successfully.

copy-item With Alternate Credentials

You should be able to pass whatever credentials you want to the -Credential parameter. So something like:

$cred = Get-Credential

[Enter the credentials]

Copy-Item -Path $from -Destination $to -Credential $cred

CSS: create white glow around image

You can use CSS3 to create an effect like that, but then you're only going to see it in modern browsers that support box shadow, unless you use a polyfill like CSS3PIE. So, for example, you could do something like this: http://jsfiddle.net/cany2/

How do I use the JAVA_OPTS environment variable?

JAVA_OPTS is environment variable used by tomcat in its startup/shutdown script to configure params.

You can set it in linux by

export JAVA_OPTS="-Djava.awt.headless=true"

No mapping found for HTTP request with URI.... in DispatcherServlet with name

It is not finding the controllers, this is basic issues. it can be due to following reasons.

A. inside WEB-INF folder you have file web.xml that refers to dispatcherServlet. Here it this case is mvc-config.xml

<servlet>
    <servlet-name>dispatcherServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/mvc-config.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>

B. This mvc-config.xml file have namespaces and it has to scan the controllers.

<context:component-scan base-package="org.vimal.spring.controllers" />
<mvc:annotation-driven />

C. Check for the correctness of the package name where you have the controllers. It should work. 

All Controllers must be Annotated with @Controller.

What is http multipart request?

A HTTP multipart request is a HTTP request that HTTP clients construct to send files and data over to a HTTP Server. It is commonly used by browsers and HTTP clients to upload files to the server.

What does "fatal: bad revision" mean?

git revert doesn't take a filename parameter. Do you want git checkout?

How to wrap text in textview in Android

Just was working on a TextView inside a layout inside a RecyclerView. I had text getting cut off, ex, for Read this message, I saw: Read this. I tried setting android:maxLines="2" on the TextView, but nothing changed. However, android:lines="2" resulted in Read this on first line and message on the 2nd.

What is a Y-combinator?

I've lifted this from http://www.mail-archive.com/[email protected]/msg02716.html which is an explanation I wrote several years ago.

I'll use JavaScript in this example, but many other languages will work as well.

Our goal is to be able to write a recursive function of 1 variable using only functions of 1 variables and no assignments, defining things by name, etc. (Why this is our goal is another question, let's just take this as the challenge that we're given.) Seems impossible, huh? As an example, let's implement factorial.

Well step 1 is to say that we could do this easily if we cheated a little. Using functions of 2 variables and assignment we can at least avoid having to use assignment to set up the recursion.

// Here's the function that we want to recurse.
X = function (recurse, n) {
  if (0 == n)
    return 1;
  else
    return n * recurse(recurse, n - 1);
};

// This will get X to recurse.
Y = function (builder, n) {
  return builder(builder, n);
};

// Here it is in action.
Y(
  X,
  5
);

Now let's see if we can cheat less. Well firstly we're using assignment, but we don't need to. We can just write X and Y inline.

// No assignment this time.
function (builder, n) {
  return builder(builder, n);
}(
  function (recurse, n) {
    if (0 == n)
      return 1;
    else
      return n * recurse(recurse, n - 1);
  },
  5
);

But we're using functions of 2 variables to get a function of 1 variable. Can we fix that? Well a smart guy by the name of Haskell Curry has a neat trick, if you have good higher order functions then you only need functions of 1 variable. The proof is that you can get from functions of 2 (or more in the general case) variables to 1 variable with a purely mechanical text transformation like this:

// Original
F = function (i, j) {
  ...
};
F(i,j);

// Transformed
F = function (i) { return function (j) {
  ...
}};
F(i)(j);

where ... remains exactly the same. (This trick is called "currying" after its inventor. The language Haskell is also named for Haskell Curry. File that under useless trivia.) Now just apply this transformation everywhere and we get our final version.

// The dreaded Y-combinator in action!
function (builder) { return function (n) {
  return builder(builder)(n);
}}(
  function (recurse) { return function (n) {
    if (0 == n)
      return 1;
    else
      return n * recurse(recurse)(n - 1);
  }})(
  5
);

Feel free to try it. alert() that return, tie it to a button, whatever. That code calculates factorials, recursively, without using assignment, declarations, or functions of 2 variables. (But trying to trace how it works is likely to make your head spin. And handing it, without the derivation, just slightly reformatted will result in code that is sure to baffle and confuse.)

You can replace the 4 lines that recursively define factorial with any other recursive function that you want.

What is the difference between 'protected' and 'protected internal'?

There is still a lot of confusion in understanding the scope of "protected internal" accessors, though most have the definition defined correctly. This helped me to understand the confusion between "protected" and "protected internal":

public is really public inside and outside the assembly (public internal / public external)

protected is really protected inside and outside the assembly (protected internal / protected external) (not allowed on top level classes)

private is really private inside and outside the assembly (private internal / private external) (not allowed on top level classes)

internal is really public inside the assembly but excluded outside the assembly like private (public internal / excluded external)

protected internal is really public inside the assembly but protected outside the assembly (public internal / protected external) (not allowed on top level classes)

As you can see protected internal is a very strange beast. Not intuitive.

That now begs the question why didn't Microsoft create a (protected internal / excluded external), or I guess some kind of "private protected" or "internal protected"? lol. Seems incomplete?

Added to the confusion is the fact you can nest public or protected internal nested members inside protected, internal, or private types. Why would you access a nested "protected internal" inside an internal class that excludes outside assembly access?

Microsoft says such nested types are limited by their parent type scope, but that's not what the compiler says. You can compiled protected internals inside internal classes which should limit scope to just the assembly.

To me this feels like incomplete design. They should have simplified scope of all types to a system that clearly consider inheritance but also security and hierarchy of nested types. This would have made the sharing of objects extremely intuitive and granular rather than discovering accessibility of types and members based on an incomplete scoping system.

Using a dictionary to select function to execute

 
class CallByName():
    
    def method1(self):
        pass

    def method2(self):
        pass

    def method3(self):
        pass

    def get_method(self, method_name):
        method = getattr(self, method_name)
        return method()


callbyname = CallByName()
method1 = callbyname.get_method(method_name)

```

How to merge two files line by line in Bash

Try following. 

pr -tmJ a.txt b.txt > c.txt

How do I mock a class without an interface?

If you cannot change the class under test, then the only option I can suggest is using MS Fakes https://msdn.microsoft.com/en-us/library/hh549175.aspx. However, MS Fakes works only in a few editions of Visual Studio.

If else embedding inside html

 
 <?php if (date("H") < "12" && date("H")>"6") { ?>
   src="<?php bloginfo('template_url'); ?>/images/img/morning.gif" 
 <?php } elseif (date("H") > "12" && date("H")<"17") { ?>
 src="<?php bloginfo('template_url'); ?>/images/img/noon.gif" 
  <?php } elseif (date("H") > "17" && date("H")<"21") { ?>
   src="<?php bloginfo('template_url'); ?>/images/img/evening.gif" 
  <?php } elseif (date("H") > "21" && date("H")<"24") { ?>
  src="<?php bloginfo('template_url'); ?>/images/img/night.gif" 
  <?php }else { ?>
  src="<?php bloginfo('template_url'); ?>/images/img/mid_night.gif" 
  <?php } ?>

Lambda expression to convert array/List of String to array/List of Integers

You can also use, 

List<String> list = new ArrayList<>();
    list.add("1");
    list.add("2");
    list.add("3");

    Integer[] array = list.stream()
        .map( v -> Integer.valueOf(v))
        .toArray(Integer[]::new);

Display XML content in HTML page

2017 Update I guess. textarea worked fine for me using Spring, Bootstrap and a bunch of other things. Got the SOAP payload stored in a DB, read by Spring and push via Spring-MVC. xmp didn't work at all.

How to correctly use Html.ActionLink with ASP.NET MVC 4 Areas

Below are some of the way by which you can create a link button in MVC.

@Html.ActionLink("Admin", "Index", "Home", new { area = "Admin" }, null)  
@Html.RouteLink("Admin", new { action = "Index", controller = "Home", area = "Admin" })  
@Html.Action("Action", "Controller", new { area = "AreaName" })  
@Url.Action("Action", "Controller", new { area = "AreaName" })  
<a class="ui-btn" data-val="abc" href="/Home/Edit/ANTON">Edit</a>  
<a data-ajax="true" data-ajax-method="GET" data-ajax-mode="replace" data-ajax-update="#CustomerList" href="/Home/Germany">Customer from Germany</a>  
<a data-ajax="true" data-ajax-method="GET" data-ajax-mode="replace" data-ajax-update="#CustomerList" href="/Home/Mexico">Customer from Mexico</a>

Hope this will help you.

How to turn off Wifi via ADB?

 
adb shell "svc wifi enable"

This worked & it makes action in background without opening related option !!

How to use font-family lato?

Download it from here and extract LatoOFL.rar then go to TTF and open this font-face-generator click at Choose File choose font which you want to use and click at generate then download it and then go html file open it and you see the code like this

@font-face {
        font-family: "Lato Black";
        src: url('698242188-Lato-Bla.eot');
        src: url('698242188-Lato-Bla.eot?#iefix') format('embedded-opentype'),
        url('698242188-Lato-Bla.svg#Lato Black') format('svg'),
        url('698242188-Lato-Bla.woff') format('woff'),
        url('698242188-Lato-Bla.ttf') format('truetype');
        font-weight: normal;
        font-style: normal;
}
body{
    font-family: "Lato Black";
    direction: ltr;
}

change the src code and give the url where your this font directory placed, now you can use it at your website...

If you don't want to download it use this

<link type='text/css' href='http://fonts.googleapis.com/css?family=Lato:400,700' />

Retrieving values from nested JSON Object

Maybe you're not using the latest version of a JSON for Java Library.

json-simple has not been updated for a long time, while JSON-Java was updated 2 month ago.

JSON-Java can be found on GitHub, here is the link to its repo: https://github.com/douglascrockford/JSON-java

After switching the library, you can refer to my sample code down below:

public static void main(String[] args) {
    String JSON = "{\"LanguageLevels\":{\"1\":\"Pocz\\u0105tkuj\\u0105cy\",\"2\":\"\\u015arednioZaawansowany\",\"3\":\"Zaawansowany\",\"4\":\"Ekspert\"}}\n";

    JSONObject jsonObject = new JSONObject(JSON);
    JSONObject getSth = jsonObject.getJSONObject("LanguageLevels");
    Object level = getSth.get("2");

    System.out.println(level);
}

And as JSON-Java open-sourced, you can read the code and its document, they will guide you through.

Hope that it helps.

How to get a view table query (code) in SQL Server 2008 Management Studio

In Management Studio, open the Object Explorer.

  • Go to your database
  • There's a subnode Views
  • Find your view
  • Choose Script view as > Create To > New query window

and you're done!

enter image description here

If you want to retrieve the SQL statement that defines the view from T-SQL code, use this:

SELECT  
    m.definition    
FROM sys.views v
INNER JOIN sys.sql_modules m ON m.object_id = v.object_id
WHERE name = 'Example_1'

How would I check a string for a certain letter in Python?

in keyword allows you to loop over a collection and check if there is a member in the collection that is equal to the element.

In this case string is nothing but a list of characters:

dog = "xdasds"
if "x" in dog:
     print "Yes!"

You can check a substring too:

>>> 'x' in "xdasds"
True
>>> 'xd' in "xdasds"
True
>>> 
>>> 
>>> 'xa' in "xdasds"
False

Think collection:

>>> 'x' in ['x', 'd', 'a', 's', 'd', 's']
True
>>>

You can also test the set membership over user defined classes.

For user-defined classes which define the __contains__ method, x in y is true if and only if y.__contains__(x) is true.