Examples On Programing Languages

How to check if a String contains only ASCII?

The call Character.isLetter(c) returns true if the character is a letter. But is there a way to quickly find if a String only contains the base characters of ASCII?...

Seconds CountDown Timer

I have a lblCountdown with an int value of 60. I want to make the int value of the lblCountDown decrease with seconds until it reaches 0. This is what I have so far: private int counter = 60; private void button1_Click(object sender, EventAr...

MySQL, Check if a column exists in a table with SQL

I am trying to write a query that will check if a specific table in MySQL has a specific column, and if not — create it. Otherwise do nothing. This is really an easy procedure in any enterprise-class database, yet MySQL seems to be an exception. ...

Best way to compare dates in Android

I am trying to compare a date in a String format to the current date. This is how I did it (haven't tested, but should work), but am using deprecated methods. Any good suggestion for an alternative? Thanks. P.S. I really hate doing Date stuff in Jav...

The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required?

I want to send an email from my application and i have written following code for sending mail MailMessage msg = new MailMessage(); msg.From = new MailAddress("mymailid"); msg.To.Add("receipientid"); msg.Subject = "test"; msg.Bo...

find -exec with multiple commands

I am trying to use find -exec with multiple commands without any success. Does anybody know if commands such as the following are possible? find *.txt -exec echo "$(tail -1 '{}'),$(ls '{}')" \; Basically, I am trying to print the last line of eac...

Python: how to print range a-z?

1. Print a-n: a b c d e f g h i j k l m n 2. Every second in a-n: a c e g i k m 3. Append a-n to index of urls{hello.com/, hej.com/, ..., hallo.com/}: hello.com/a hej.com/b ... hallo.com/n...

How to get the number of characters in a std::string?

How should I get the number of characters in a string in C++?...

How to create a DateTime equal to 15 minutes ago?

I need to create a DateTime object that represents the current time minus 15 minutes....

Should I declare Jackson's ObjectMapper as a static field?

The Jackson library's ObjectMapper class seems to be thread safe. Does this mean that I should declare my ObjectMapper as a static field like this class Me { private static final ObjectMapper mapper = new ObjectMapper(); } instead of as an in...

How to obtain the query string from the current URL with JavaScript?

I have URL like this: http://localhost/PMApp/temp.htm?ProjectID=462 What I need to do is to get the details after the ? sign (query string) - that is ProjectID=462. How can I get that using JavaScript? What I've done so far is this: var url = wi...

Determine the line of code that causes a segmentation fault?

How does one determine where the mistake is in the code that causes a segmentation fault? Can my compiler (gcc) show the location of the fault in the program?...

How to get the selected date value while using Bootstrap Datepicker?

Using jquery and the Bootstrap Datepicker, how do I get the new date value I selected using the Bootstrap Datepicker? FYI, I'm using Rails 3 and Coffescript. I set up the datapicker using: <input id="startdate" class="span2 datepicker" type="te...

How to print a two dimensional array?

I have a [20][20] two dimensional array that I've manipulated. In a few words I am doing a turtle project with user inputting instructions like pen up = 0 and pen down = 1. When the pen is down the individual array location, for instance [3][4] is ma...

Function pointer to member function

I'd like to set up a function pointer as a member of a class that is a pointer to another function in the same class. The reasons why I'm doing this are complicated. In this example, I would like the output to be "1" class A { public: int f(); in...

How to align checkboxes and their labels consistently cross-browsers

This is one of the minor CSS problems that plagues me constantly. How do folks around Stack Overflow vertically align checkboxes and their labels consistently cross-browser? Whenever I align them correctly in Safari (usually using vertical-align: b...

extract part of a string using bash/cut/split

I have a string like this: /var/cpanel/users/joebloggs:DNS9=domain.com I need to extract the username (joebloggs) from this string and store it in a variable. The format of the string will always be the same with exception of joebloggs and domai...

Angular2 change detection: ngOnChanges not firing for nested object

I know I am not the first to ask about this, but I can't find an answer in the previous questions. I have this in one component <div class="col-sm-5"> <laps [lapsData]="rawLapsData" [selectedTps]="selectedTps" (l...

Reference an Element in a List of Tuples

Sorry in advance, but I'm new to Python. I have a list of tuples, and I was wondering how I can reference, say, the first element of each tuple within the list. I would think it's something like for i in number_of_tuples : first_element = myLis...

Go to URL after OK button if alert is pressed

I need to make sure that when the user clicks OK in a JavaScript alert window, the browser moves to a different URL. Is this possible? ...

how to reference a YAML "setting" from elsewhere in the same YAML file?

I have the following YAML: paths: patha: /path/to/root/a pathb: /path/to/root/b pathc: /path/to/root/c How can I "normalise" this, by removing /path/to/root/ from the three paths, and have it as its own setting, something like: paths: roo...

How to Validate on Max File Size in Laravel?

I'm trying to validate on a max file size of 500kb in Laravel: $validator = Validator::make($request->all(), [ 'file' => 'size:500', ]); But this says that the file should be exactly 500kb big. How can I edit this rule so that it return...

Are list-comprehensions and functional functions faster than "for loops"?

In terms of performance in Python, is a list-comprehension, or functions like map(), filter() and reduce() faster than a for loop? Why, technically, they run in a C speed, while the for loop runs in the python virtual machine speed?. Suppose that in...

PHP XML Extension: Not installed

So i'm currently installing mybb and went through a very long tutorial on how to do it. The problem is when I get to the requirements check this shows up How does one go about fixing this? I read that I may need to do sudo apt-get install php-xm...

Is List<Dog> a subclass of List<Animal>? Why are Java generics not implicitly polymorphic?

I'm a bit confused about how Java generics handle inheritance / polymorphism. Assume the following hierarchy - Animal (Parent) Dog - Cat (Children) So suppose I have a method doSomething(List<Animal> animals). By all the rules of inheritanc...

Update Row if it Exists Else Insert Logic with Entity Framework

Does anyone have suggestions on the most efficient way to implement "update row if it exists else insert" logic using Entity Framework?...

Sorting an IList in C#

So I came across an interesting problem today. We have a WCF web service that returns an IList. Not really a big deal until I wanted to sort it. Turns out the IList interface doesn't have a sort method built in. I ended up using the ArrayList.Adap...

Core dump file analysis

What are all the things I will need to check while analyzing a core dump file? Please tell me from scratch....

MySQL PHP - SELECT WHERE id = array()?

Possible Duplicate: MySQL query using an array Passing an array to mysql I have an array in PHP: $array = array(1, 4, 5, 7); As you can see, I have an array of different values, but I want to write a MYSQL statement that will check if...

How to insert a row between two rows in an existing excel with HSSF (Apache POI)

Somehow I manage to create new rows between two rows in an existing excel file. The problem is, some of the formatting were not include along the shifting of the rows. One of this, is the row that are hide are not relatively go along during the shi...

How to recompile with -fPIC

I was trying to reinstall my ffmpeg, following this guide, on my ARM Ubuntu machine. Unfortunately, when I compile a program which uses this lib I get the following failure: /usr/bin/ld: /usr/local/lib/libavcodec.a(amrnbdec.o): relocation R_ARM_MOVW...

Determine the number of lines within a text file

Is there an easy way to programmatically determine the number of lines within a text file? ...

Image inside div has extra space below the image

Why in the following code the height of the div is bigger than the height of the img ? There is a gap below the image, but it doesn't seems to be a padding/margin. What is the gap or extra space below image? _x000D_ _x000D_ #wrapper {_x000D_ bor...

dropdownlist set selected value in MVC3 Razor

Here is my model: public class NewsCategoriesModel { public int NewsCategoriesID { get; set; } public string NewsCategoriesName { get; set; } } My controller: public ActionResult NewsEdit(int ID, dms_New dsn) { dsn = (from a i...

Read values into a shell variable from a pipe

I am trying to get bash to process data from stdin that gets piped into, but no luck. What I mean is none of the following work: echo "hello world" | test=($(< /dev/stdin)); echo test=$test test= echo "hello world" | read test; echo test=$test t...

Remove a HTML tag but keep the innerHtml

I have some simple HTML which I need to strip simple formatting. A nice house was found in <b>Toronto</b>. I need to remove the bold, but leave the sentence intact. How is this possible in jQuery?...

Error:(23, 17) Failed to resolve: junit:junit:4.12

Why is it that every time I create a new project in Android Studio, it always comes up with: Error:(23, 17) Failed to resolve: junit:junit:4.12? When I remove testCompile 'junit:junit:4.12' in dependencies it is not a problem anymore. build.gr...

Convert pandas data frame to series

I'm somewhat new to pandas. I have a pandas data frame that is 1 row by 23 columns. I want to convert this into a series? I'm wondering what the most pythonic way to do this is? I've tried pd.Series(myResults) but it complains ValueError: cannot co...

Directory.GetFiles of certain extension

Is there a way to simplify this linq expression, or is there a better way of doing this? Directory.GetFiles(dir, "*.*", SearchOption.AllDirectories) .Where(s => s.EndsWith(".jpg", StringComparison.OrdinalIgnoreCase) || ...

What is the point of WORKDIR on Dockerfile?

I'm learning Docker. For many times I've seen that Dockerfile has WORKDIR command: FROM node:latest RUN mkdir -p /usr/src/app WORKDIR /usr/src/app COPY package.json /usr/src/app/ RUN npm install COPY . /usr/src/app EXPOSE 3000 CMD [ “npm”, “st...

How to make the 'cut' command treat same sequental delimiters as one?

I'm trying to extract a certain (the fourth) field from the column-based, 'space'-adjusted text stream. I'm trying to use the cut command in the following manner: cat text.txt | cut -d " " -f 4 Unfortunately, cut doesn't treat several spaces as on...

Change the Right Margin of a View Programmatically?

Can this attribute be changed dynamically in Java code? android:layout_marginRight I have a TextView, that has to change its position some pixels to the left dynamically. How to do it programmatically? ...

How to generate Javadoc from command line

Can anybody show me how to generate Javadoc from command line? My project contains the package com.test and I want to put the generated documentation in files located in a specific folder like this: C:/javadoc/test....

How do I turn off the output from tar commands on Unix?

I had a look at the options, but nothing seemed obvious as a manner in which to turn off the output when uncompressing a file. The below is the code I am currently using... I just need the option to switch off the output. tar -zxvf tmp.tar.gz -C ~/t...

<button> vs. <input type="button" />. Which to use?

When looking at most sites (including SO), most of them use: <input type="button" /> instead of: <button></button> What are the main differences between the two, if any? Are there valid reasons to use one instead of the other...

Can you style html form buttons with css?

I don't like the default button style. It's really boring. I am using <input type="submit"> type buttons. Can I style these somehow in css? If not, the other way of doing it i guess would be to use a div instead, and make it a link. How do ...

How to set background image in Java?

I am developing a simple platform game using Java using BlueJ as the IDE. Right now I have player/enemy sprites, platforms and other items in the game drawn using polygons and simple shapes. Eventually I hope to replace them with actual images. For ...

How to enable TLS 1.2 in Java 7

I am trying to enable TLS 1.2 in my web app which uses JBoss 6.4 and Java 1.7. I have -Dhttp.protocols = TLSv1.2 in my application environment but it doesn't seem to work for me. Is there anything I could do to enable TLS 1.2? I wrote a simple pro...

Are loops really faster in reverse?

I've heard this quite a few times. Are JavaScript loops really faster when counting backward? If so, why? I've seen a few test suite examples showing that reversed loops are quicker, but I can't find any explanation as to why! I'm assuming it's beca...

Include .so library in apk in android studio

I am trying my hands on developing a simple android application in which I am trying to use sqlcipher, which uses .so libraries internally. I have read the documentation on how to use sqlcipher with android app. I have followed the steps and it compi...

How to display Base64 images in HTML?

I'm having trouble displaying a Base64 image inline. Can someone point me in the right direction? <!DOCTYPE html> <html> <head> <title>Display Image</title> </head> <body> <img style='displ...

Best way to find os name and version in Unix/Linux platform

I need to find the OS name and version on Unix/Linux platform. For this I tried following: lsb_release utility /etc/redhat-release or specific file But it does not seem to be best solution as LSB_RELEASE support is no longer for RHEL 7. Is there...

How to include duplicate keys in HashMap?

I need linked and multiple keys in key set. I tried this: LinkedHashMap<Integer, String> map = new LinkedHashMap< Integer,String>(); map.put( -1505711364,"4"); map.put(294357273, "15"); map.put(-1593134417, "28"); map.put(-1231165758, ...

Is there a built-in function to print all the current properties and values of an object?

So what I'm looking for here is something like PHP's print_r function. This is so I can debug my scripts by seeing what's the state of the object in question....

curl: (35) SSL connect error

[root@vagrant-centos65 you-get]# curl -v https://api.xxx.cn * About to connect() to api.xxx.cn port 443 (#0) * Trying 123.xxx.xx.xx... connected * Connected to api.xxx.cn (123.xxx.xx.xx) port 443 (#0) * Initializing NSS with certpath: sql:/etc/pki...

Is there a C# case insensitive equals operator?

I know that the following is case sensitive: if (StringA == StringB) { So is there an operator which will compare two strings in an insensitive manner?...

Best practice: PHP Magic Methods set and get

Possible Duplicate: Are Magic Methods Best practice in PHP? These are simple examples, but imagine you have more properties than two in your class. What would be best practice? a) Using __get and __set class MyClass { private $first...

How do you add an SDK to Android Studio?

I'm using Google's Android Studio 0.1 based on IntelliJ, and I cannot figure out how to add additional SDKs to my project. I exported my existing project from Eclipse to a Gradle project, which I imported into Android Studio, as recommended by Googl...

Java: Getting a substring from a string starting after a particular character

I have a string: /abc/def/ghfj.doc I would like to extract ghfj.doc from this, i.e. the substring after the last /, or first / from right. Could someone please provide some help?...

How do I obtain a Query Execution Plan in SQL Server?

In Microsoft SQL Server how can I get a query execution plan for a query / stored procedure?...

c# replace \" characters

I am sent an XML string that I'm trying to parse via an XmlReader and I'm trying to strip out the \" characters. I've tried .Replace(@"\", "") .Replace("\\''", "''") .Replace("\\''", "\"") plus several other ways. Any ideas?...

Convert Json Array to normal Java list

Is there a way to convert JSON Array to normal Java Array for android ListView data binding?...

Control the size of points in an R scatterplot?

In R, the plot() function takes a pch argument that controls the appearance of the points in the plot. I'm making scatterplots with tens of thousands of points and prefer a small, but not too small dot. Basically, I find pch='.' to be too small, bu...

Is there a difference between "==" and "is"?

My Google-fu has failed me. In Python, are the following two tests for equality equivalent? n = 5 # Test one. if n == 5: print 'Yay!' # Test two. if n is 5: print 'Yay!' Does this hold true for objects where you would be comparing instan...

How to run the sftp command with a password from Bash script?

I need to transfer a log file to a remote host using sftp from a Linux host. I have been provided credentials for the same from my operations group. However, since I don't have control over other host, I cannot generate and share RSA keys with the ot...

Serving static web resources in Spring Boot & Spring Security application

I am trying to develop Spring Boot web application and securing it using Spring security java configuration. After placing my static web resources in 'src/main/resources/public' as advised here in Spring blog, I am able to get the static resources. ...

How to reverse a singly linked list using only two pointers?

I wonder if there exists some logic to reverse a singly-linked list using only two pointers. The following is used to reverse the single linked list using three pointers namely p, q, r: struct node { int data; struct node *link; }; void re...

How to list all methods for an object in Ruby?

How do I list all the methods that a particular object has access to? I have a @current_user object, defined in the application controller: def current_user @current_user ||= User.find(session[:user_id]) if session[:user_id] end And want to see...

Python error message io.UnsupportedOperation: not readable

I made a simple program but It shows the following error when I run it: line1 = [] line1.append("xyz ") line1.append("abc") line1.append("mno") file = open("File.txt","w") for i in range(3): file.write(line1[i]) file.write("\n") for line i...

Add a list item through javascript

So, I am trying to print out an array that gets user input text added to it, but what I want to print out is an ordered list of the array. As you can see, (if you run my code) the list item just keeps getting the user input added to it, and no new li...

Oracle SQL Developer - tables cannot be seen

I was using SQL Developer 1.1. I have recently upgraded to SQL Developer 3. After the upgrade, I noticed that some of my connections do not show their tables. I can do a select on the tables and the data is shown. I can see other objects like views e...

How do I create a GUI for a windows application using C++?

I am deciding on how to develop a GUI for a small c++/win32 api project (working Visual Studio C++ 2008). The project will only need a few components to start off the main process so it will be very light weight (just 1 button and a text box pretty m...

Loading custom configuration files

I know I can open config files that are related to an assembly with the static ConfigurationManager.OpenExe(exePath) method but I just want to open a config that is not related to an assembly. Just a standard .NET config file....

How to get number of rows inserted by a transaction

I have to manage a log where i have to see the number of rows that are inserted by a transaction. Is there any way of doing it dynamically ?...

How to get full path of selected file on change of <input type=‘file’> using javascript, jquery-ajax?

How to get full path of file while selecting file using <input type=‘file’> <input type="file" id="fileUpload"> <script type="text/javascript"> function getFilePath(){ $('input[type=file]').change(function () { va...

Using Notepad++ to validate XML against an XSD

Can someone explain how to use Notepad++ to validate an xml file against an xsd. There are no options in the "XML Tools" plugin dropdown that provides for specifying an XSD file. The XML plugin is installed properly in the plugins subdir and the 3...

Very Long If Statement in Python

I have a very long if statement in Python. What is the best way to break it up into several lines? By best I mean most readable/common. ...

Cleanest Way to Invoke Cross-Thread Events

I find that the .NET event model is such that I'll often be raising an event on one thread and listening for it on another thread. I was wondering what the cleanest way to marshal an event from a background thread onto my UI thread is. Based on the...

How can I set the color of a selected row in DataGrid

The default background color of a selected row in DataGrid is so dark that I can't read it. Is there anyway of overriding it? Tried this <dg:DataGrid.RowStyle> <Style TargetType="{x:Type dg:DataGridRow}"> <Style.Triggers...

Can't append <script> element

Any idea why the piece of code below does not add the script element to the DOM? var code = "<script></script>"; $("#someElement").append(code); ...

Regex to get string between curly braces

Unfortunately, despite having tried to learn regex at least one time a year for as many years as I can remember, I always forget as I use them so infrequently. This year my new year's resolution is to not try and learn regex again - So this year to s...

How to use LocalBroadcastManager?

How to use/locate LocalBroadcastManager as described in google docs and Service broadcast doc? I tried to google it, but there is no code available to start with? The documents say that I should use it if I want to do broadcast internally with in m...

What are the calling conventions for UNIX & Linux system calls (and user-space functions) on i386 and x86-64

Following links explain x86-32 system call conventions for both UNIX (BSD flavor) & Linux: http://www.int80h.org/bsdasm/#system-calls http://www.freebsd.org/doc/en/books/developers-handbook/x86-system-calls.html But what are the x86-64 system...

Android ViewPager with bottom dots

I want to add 3 bottom dots to my ViewPager, like this. I use FragmentActivity and support library ViewPager....

ASP.NET MVC - Attaching an entity of type 'MODELNAME' failed because another entity of the same type already has the same primary key value

In a nutshell the exception is thrown during POSTing wrapper model and changing the state of one entry to 'Modified'. Before changing the state, the state is set to 'Detached' but calling Attach() does throw the same error. I'm using EF6. Please fin...

How to set value to variable using 'execute' in t-sql?

DECLARE @dbName nvarchar(128) = 'myDb' DECLARE @siteId int exec ('SELECT TOP 1 @siteId = Id FROM ' + @dbName + '..myTbl') select @siteId When I run the script above I get the following error Msg 137, Level 15, State 1, Line 1 Must declare the s...

Maven does not find JUnit tests to run

I have a maven program, it compiles fine. When I run mvn test it does not run any tests (under TESTs header says There are no tests to run.). I've recreated this problem with a super simple setup which I will include below as well as the output w...

What is the function __construct used for?

I have been noticing __construct a lot with classes. I did a little reading and surfing the web, but I couldn't find an explanation I could understand. I am just beginning with OOP. I was wondering if someone could give me a general idea of what it ...

Get the current date in java.sql.Date format

I need to add the current date into a prepared statement of a JDBC call. I need to add the date in a format like yyyy/MM/dd. I've try with DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd"); Date date = new Date(); pstm.setDate(6, (java.sql...

How do I create dynamic variable names inside a loop?

I'm working on an ajax google maps script and I need to create dynamic variable names in a for loop. for (var i = 0; i < coords.length; ++i) { var marker+i = "some stuff"; } What I want to get is: marker0, marker1, marker2 and so on. and I ...

Vertical align text in block element

I know vertical alignment is always asked about, but I don't seem to be able to find a solution for this particular example. I'd like the text centered within the element, not the element centered itself: HTML: <ul> <li><a href="...

How to compile python script to binary executable

I need to convert a Python script to a Windows executable. I have Python 2.6 installed to python26. I have created one script and kept it in C:\pythonscript. Inside this folder there are two files Setup.py and oldlogs.py (this file need coversion)...

Hash Table/Associative Array in VBA

I can't seem to find the documentation explaining how to create a hash table or associative array in VBA. Is it even possible? Can you link to an article or better yet post the code?...

How can I get the current date and time in the terminal and set a custom command in the terminal for it?

I have to check the time in a Linux terminal. What is the command for getting date and time in a Linux terminal? Is there a way in which we can set a custom function?...

Press any key to continue

According to Microsoft's documentation, read-host lets the user type some input, and then press enter to continue. Not exactly the correct behavior if you want to have "Press any key to continue". (Wait... where's the Any key?!) Is there a way to ac...

How to get a view table query (code) in SQL Server 2008 Management Studio

I have a view in SQL Server 2008 and would like to view it in Management Studio. Example: --is the underlying query for the view Example_1 select * from table_aView View name: Example_1 How to get the query of the corresponding view table (que...

python paramiko ssh

i'm new on python. i wrote a script to connect to a host and execute one command ssh = paramiko.SSHClient() ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy()) ssh.connect(host, username=user, password=pw) print 'running remote command' stdi...

How can I increase the size of a bootstrap button?

For example I've made my button <div class="btn btn-default"> Active </div> and it looks like the following However I would like to have my button like this How can I enlarge the width of the bootstrap button regardless of text...

Android Studio Gradle DSL method not found: 'android()' -- Error(17,0)

I am attempting to run my project in Android Studio but the error appears below: I have followed many sources just to get this to run and have wound up here, but do not know what else to do. How can I configure this project to run? build.gradle...

Replacement for "rename" in dplyr

I like plyr's renaming function rename. I have recently started using dplyr, and was wondering if there is an easy way to rename variables using a function from dplyr, that is as easy to use as to plyr's rename?...

What does the CSS rule "clear: both" do?

What does the following CSS rule do: .clear { clear: both; } And why do we need to use it?...

Node.js https pem error: routines:PEM_read_bio:no start line

I am messing with login form right now with node.js, I tried creating a pem key and csr using openssl req -newkey rsa:2048 -new -nodes -keyout key.pem -out csr.pem However I been getting errors for running node server.js Here is my server.js va...

Limit to 2 decimal places with a simple pipe

I have found an example which limits a number to 2 decimal places AND turns the figure into a currency amount- eg £2.55. {{ number | currency : 'GBP' : true : '1.2-2'}} Is there a simple pipe which does the same without applying a currency?...

show dbs gives "Not Authorized to execute command" error

I've spent some time trying to figure out what is wrong but as I could not find out, I decided to ask here. I am running MongoDB(Windows 64-bit 2008 R2+) version 3.2.3 on Windows 8, the paths are : C:\MongoDB\bin for the installation C:\data\db fo...

git pull remote branch cannot find remote ref

I'm not sure why this doesn't work. When I do git branch -a, this is what I see: I'm trying to pull from the DownloadManager on the online GitHub repository. I have tried git pull, but then it complains about not knowing which branch to pull f...

Reading from text file until EOF repeats last line

The following C++ code uses a ifstream object to read integers from a text file (which has one number per line) until it hits EOF. Why does it read the integer on the last line twice? How to fix this? Code: #include <iostream> #include <fs...

Using the Web.Config to set up my SQL database connection string?

Can anyone help me out please? I'm confused. I want to set up my connection string so I can just call it from my Web.Config file. I need a way to call it from my code, please make a little example. :( I also need help on setting up the Web.Config...

CSS selector last row from main table

I have a table inside a table, and I want to fill the background of the last row of table 1 only — not table 2. <style> #test tr:last-child { background:#ff0000; } </style> <table border="1" width="100%" id="test"> <tr>...

set dropdown value by text using jquery

I have a dropdown as: <select id="HowYouKnow" > <option value="1">FRIEND</option> <option value="2">GOOGLE</option> <option value="3">AGENT</option></select> In the above dropdown i know the te...

strange error in my Animation Drawable

A strange error when trying to start Activity. i think the error in my Animation Drawable LogCat: 12-31 06:37:45.138: E/AndroidRuntime(922): FATAL EXCEPTION: main 12-31 06:37:45.138: E/AndroidRuntime(922): java.lang.RuntimeException: Unabl...

How to set environment variables in PyCharm?

I have started to work on a Django project, and I would like to set some environment variables without setting them manually or having a bash file to source. I want to set the following variables: export DATABASE_URL=postgres://127.0.0.1:5432/my_db_n...

Http Get using Android HttpURLConnection

I'm new to Java and Android development and try to create a simple app which should contact a web server and add some data to a database using a http get. When I do the call using the web browser in my computer it works just fine. However, when I do...

How to delete columns in a CSV file?

I have been able to create a csv with python using the input from several users on this site and I wish to express my gratitude for your posts. I am now stumped and will post my first question. My input.csv looks like this: day,month,year,lat,long...

Install IPA with iTunes 11

I have an IPA signed for ad-hoc distribution. I can install it fine with Xcode Organizer by dragging it to the device. It also worked with iTunes <=10 by dragging onto the device name. I'd like to install it via iTunes 11 though. Dragging it onto ...

CSS background image to fit height, width should auto-scale in proportion

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DD/MM/YYYY Date format in Moment.js

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Invalid CSRF Token 'null' was found on the request parameter '_csrf' or header 'X-CSRF-TOKEN'

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jQuery Datepicker localization

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What are the differences between JavaScript's window.onload and jQuery's $(document).ready() method?...

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I'd like to 'fake' a 404 page in Rails. In PHP, I would just send a header with the error code as such: header("HTTP/1.0 404 Not Found"); How is that done with Rails?...

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I'm just beginning to write programs in Java. What does the following Java code mean? public static void main(String[] args) What is String[] args? When would you use these args? Source code and/or examples are preferred over abstract explanat...

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I'm performing a simple task of uploading a file using Python requests library. I searched Stack Overflow and no one seemed to have the same problem, namely, that the file is not received by the server: import requests url='http://nesssi.cacr.caltec...

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I'm taking some JavaScript/jQuery lessons at codecademy.com. Normally the lessons provide answers or hints, but for this one it doesn't give any help and I'm a little confused by the instructions. It says to make the function makeGamePlayer return ...

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I am looking horizontal dropdown menu pure css based and browser compatible.... i am looking like mentioned below example ...

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I have made a dictionary which contains two values a DateTime and a string. Now I want to print everything from the dictionary to a Textbox. Does anybody know how to do this. I have used this code to print the dictionary to the console: private void...

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In my JSF/Facelets app, here's a simplified version of part of my form: <h:form id="myform"> <h:inputSecret value="#{createNewPassword.newPassword1}" id="newPassword1" /> <h:message class="error" for="newPassword1" /> <h:i...

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Using only pure JavaScript, what is the most efficient way to select all DOM elements that have a certain data- attribute (let's say data-foo). The elements may be different, for example: <p data-foo="0"></p><br/><h6 da...

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There's a similar post on stack but it doesn't help with my issue possibly because I am using Visual Studio 2015. How do I get the "Enable NuGet Package Restore" option to appear in VS2015? I chose File > New Project and created an empty ASP.NET We...

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I'm having some problems with a jQuery control we made. Suppose you have a dropdownlist that allows you to enter the ID of the item you're looking for, and when you press ENTER or lose focus in a textbox it validates via jQuery that the ID you entere...

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I am writing a pyqt application which require to execute admin task. I would prefer to start my script with elevate privilege. I am aware that this question is asked many times in SO or in other forum. But the solution people are suggesting is to hav...

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The SRC and HREF attributes are used to include some external entities like an image, a CSS file, a HTML file, any other web page or a JavaScript file. Is there a clear differentiation between SRC and HREF? Where or when to use SRC or HREF? I think...

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Twitter's bootstrap uses Icons by Glyphicons. They are "available in dark gray and white" by default: Is it possible to use some CSS trickery to change the colors of the icons? I was hoping for some other css3 brilliance that would prevent having ...

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I have a table in PostgreSQL with many columns, and I want to add an auto increment primary key. I tried to create a column called id of type BIGSERIAL but pgadmin responded with an error: ERROR: sequence must have same owner as table it is linked t...

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I'm learning laravel and follwing this tutorial, But when I went try and install npm, is says bash: npm: command not found ...

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How can I remove all characters except numbers from string?...

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For example: 9 / 5 #=> 1 but I expected 1.8. How can I get the correct decimal (non-integer) result? Why is it returning 1 at all?...

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I have form that I generate its content to Excel through PHPExcel, my problem is that how can I set width and height and also styles to the heading cells. the excel generated demo is here: the excel i want is here: here is my code: for ($col ...

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What is the easiest way to show a .jpg or .gif image from Python console? I've got a Python console program that is checking a data set which contains links to images stored locally. How should I write the script so that it would display images pop-...

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What is the Windows batch equivalent of the Linux shell command echo -n which suppresses the newline at the end of the output? The idea is to write on the same line inside a loop....

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I have uploaded my localhost files to my website but it is showing me this error:- : [2] file_put_contents( ***WebsiteURL*** /cache/lang/ ***FileName*** .php) [function.file-put-contents]: failed to open stream: HTTP wrapper does not support write...

Adding <script> to WordPress in <head> element

I'm trying to insert this code: <script type="text/javascript"> some Javascript codes comes here </script> to WordPress' <head></head> section in front end and in admin panel E.g., Joomla! 1.6 has an API that allows t...

Why use Gradle instead of Ant or Maven?

What does another build tool targeted at Java really get me? If you use Gradle over another tool, why?...

Explain ggplot2 warning: "Removed k rows containing missing values"

I get this warning when I am trying to generate a plot with ggplot. After researching online for a while many suggested that my database contains either null values or missing data in general, which was not the case. In this question the accepted a...

Installing Git on Eclipse

How can I install Git on Eclipse? I found tutorials on http://cho.hapgoods.com/wordpress/?p=159 but there was said that "You should then see the eight Eclipse projects 'org.spearce.something.'" I don't see those eight projects....

Pointer arithmetic for void pointer in C

When a pointer to a particular type (say int, char, float, ..) is incremented, its value is increased by the size of that data type. If a void pointer which points to data of size x is incremented, how does it get to point x bytes ahead? How does the...

async at console app in C#?

I have this simple code : public static async Task<int> SumTwoOperationsAsync() { var firstTask = GetOperationOneAsync(); var secondTask = GetOperationTwoAsync(); return await firstTask + await secondTask; } private async Task<...

COPYing a file in a Dockerfile, no such file or directory?

I have a Dockerfile set up in my root (~) folder. The first three lines of my file look like this: COPY file1 /root/folder/ COPY file2 /root/folder/ COPY file3 /root/folder/ but it returns the following error for each line: No such file or dir...

could not extract ResultSet in hibernate

I have a problem with Hibernate. I try to parse to List but It throws an exception: HTTP Status 500 - could not extract ResultSet. When I debug, It fault at line query.list()... My sample code here @Entity @Table(name = "catalog") public class Ca...

Exception in thread "main" java.lang.OutOfMemoryError: Java heap space

I have written a code and I run it a lot but suddenly I got an OutOfMemoryError: Exception in thread "main" java.lang.OutOfMemoryError: Java heap space at javax.media.j3d.BoundingBox.<init>(BoundingBox.java:86) at javax.media...

Unsupported operand type(s) for +: 'int' and 'str'

I am currently learning Python so I have no idea what is going on. num1 = int(input("What is your first number? ")) num2 = int(input("What is your second number? ")) num3 = int(input("What is your third number? ")) numlist = [num1, num2, num3] prin...

Checking if element exists with Python Selenium

I have a problem - I am using the selenium (firefox) web driver to open a webpage, click a few links etc. then capture a screenshot. My script runs fine from the CLI, but when run via a cronjob it is not getting past the first find_element() test. I...

Why is jquery's .ajax() method not sending my session cookie?

After logging in via $.ajax() to a site, I am trying to send a second $.ajax() request to that site - but when I check the headers sent using FireBug, there is no session cookie being included in the request. What am I doing wrong?...

Set encoding and fileencoding to utf-8 in Vim

What is the difference between these two commands? set encoding=utf-8 set fileencoding=utf-8 Do I need to set both when I want to use utf-8? Also, do I need to set fileencoding with set or setglobal?...

How to fix/convert space indentation in Sublime Text?

Example: If I have a document with 2 space indentation, and I want it to have 4 space indentation, how do I automatically convert it by using the Sublime Text editor?...

Programmatically register a broadcast receiver

I'd like to know what is the best practice/way of programmatically register a broadcast receiver. I want to register specific receivers according to user choice. As the registration is done through the manifest file, I'm wondering if there's a prope...

How do I get a list of all subdomains of a domain?

I want to find out all the subdomains of a given domain. I found a hint which tells me to dig the authoritative Nameserver with the following option: dig @ns1.foo.bar some_domain.com axfr But this never works. Has anyone a better idea/approach...

How to remove \xa0 from string in Python?

I am currently using Beautiful Soup to parse an HTML file and calling get_text(), but it seems like I'm being left with a lot of \xa0 Unicode representing spaces. Is there an efficient way to remove all of them in Python 2.7, and change them into spa...

Best way to save a trained model in PyTorch?

I was looking for alternative ways to save a trained model in PyTorch. So far, I have found two alternatives. torch.save() to save a model and torch.load() to load a model. model.state_dict() to save a trained model and model.load_state_dict() to l...

SQL 'like' vs '=' performance

This question skirts around what I'm wondering, but the answers don't exactly address it. It would seem that in general '=' is faster than 'like' when using wildcards. This appears to be the conventional wisdom. However, lets suppose I have a col...

SQL select * from column where year = 2010

This is probably a simple where clause but I want to say, from columnX (which is datetime) I want all rows where just the year = 2010. so: select * from mytable where Columnx = ...

Android Studio error: "Environment variable does not point to a valid JVM installation"

When trying to run Android Studio on my computer, I get the following error: The Environment variable JAVA_HOME (with a value of C:\Program Files(x86)\Java\jdk1.7.0_51\bin) does not point to a valid JVM installation I tried to remove the \bin ...

Alter a MySQL column to be AUTO_INCREMENT

I’m trying to modify a table to make its primary key column AUTO_INCREMENT after the fact. I have tried the following SQL, but got a syntax error notification. ALTER TABLE document ALTER COLUMN document_id AUTO_INCREMENT Am I doing something wr...

Get value of a string after last slash in JavaScript

I am already trying for over an hour and cant figure out the right way to do it, although it is probably pretty easy: I have something like this : foo/bar/test.html I would like to use jQuery to extract everything after the last /. In the example a...

How to check for a valid Base64 encoded string

Is there a way in C# to see if a string is Base 64 encoded other than just trying to convert it and see if there is an error? I have code code like this: // Convert base64-encoded hash value into a byte array. byte[] HashBytes = Convert.FromBase64S...

Using "If cell contains #N/A" as a formula condition.

I need help on my Excel sheet. How can I declare the following IF condition properly? if A1 = "n/a" then C1 = B1 else if A1 != "n/a" or has value(int) then C1 = A1*B1 ...

Splitting string into multiple rows in Oracle

I know this has been answered to some degree with PHP and MYSQL, but I was wondering if someone could teach me the simplest approach to splitting a string (comma delimited) into multiple rows in Oracle 10g (preferably) and 11g. The table is as foll...

How to convert a byte to its binary string representation

For example, the bits in a byte B are 10000010, how can I assign the bits to the string str literally, that is, str = "10000010". Edit I read the byte from a binary file, and stored in the byte array B. I use System.out.println(Integer.toBi...

How do I keep jQuery UI Accordion collapsed by default?

I am working with jQuery UI Accordion and it works great, but I would like to have the accordion stay closed unless it I click on it. I am using this code right now, which allows be to toggle it closed: $("#accordion").accordion({ header: "h3", col...

Find a value in an array of objects in Javascript

I know similar questions have been asked before, but this one is a little different. I have an array of unnamed objects, which contain an array of named objects, and I need to get the object where "name" is "string 1". Here is an example array. var ...