#C | Questions on C

Redirecting exec output to a buffer or file

I'm writing a C program where I fork(), exec(), and wait(). I'd like to take the output of the program I exec'ed to write it to file or buffer. For example, if I exec ls I want to write file1 file2..

How do I execute a Shell built-in command with a C function?

I would like to execute the Linux command "pwd" through a C language function like execv(). The issue is that there isn't an executable file called "pwd" and I'm unable to execute "echo $PWD", since ..

#pragma pack effect

I was wondering if someone could explain to me what the #pragma pack preprocessor statement does, and more importantly, why one would want to use it. I checked out the MSDN page, which offered some i..

How do I link object files in C? Fails with "Undefined symbols for architecture x86_64"

So I'm trying trying to use a function defined in another C (file1.c) file in my file (file2.c). I'm including the header of file1 (file1.h) in order to do this. However, I keep getting the following..

What is a difference between unsigned int and signed int in C?

Consider these definitions: int x=5; int y=-5; unsigned int z=5; How are they stored in memory? Can anybody explain the bit representation of these in memory? Can int x=5 and int y=-5 have same bi..

printf formatting (%d versus %u)

What is difference between %d and %u when printing pointer addresses? For example: int a = 5; // check the memory address printf("memory address = %d\n", &a); // prints "memory address = -12" pr..

How to disable GCC warnings for a few lines of code

In Visual C++, it's possible to use #pragma warning (disable: ...). Also I found that in GCC you can override per file compiler flags. How can I do this for "next line", or with push/pop semantics aro..

For vs. while in C programming?

There are three loops in C: for, while, and do-while. What's the difference between them? For example, it seems nearly all while statements can be replaced by for statements, right? Then, what's the ..

Convert double/float to string

I need to convert a floating point number to an equivalent string in decimal (or other base). Conversion at first needs to be done in the format xE+0 where x is the floating point number. The idea I ..

Signed to unsigned conversion in C - is it always safe?

Suppose I have the following C code. unsigned int u = 1234; int i = -5678; unsigned int result = u + i; What implicit conversions are going on here, and is this code safe for all values of u and i..

What is the printf format specifier for bool?

Since ANSI C99 there is _Bool or bool via stdbool.h. But is there also a printf format specifier for bool? I mean something like in that pseudo code: bool x = true; printf("%B\n", x); which would ..

How to throw an exception in C?

I typed this into google but only found howtos in C++, how to do it in C?..

Graphical user interface Tutorial in C

I have a project in C language and the teacher ordered to make a Gui of project. I can only use C or C++ for the GUI part. Can anyone please suggest me Some easy open source Graphics Library Tutorial..

Copy struct to struct in C

I want to copy an identical struct into another and later on use it as a comparance to the first one. The thing is that my compiler gives me a warning when Im doing like this! Should I do it in anothe..

How to read string from keyboard using C?

I want to read a string entered by the user. I don't know the length of the string. As there are no strings in C I declared a pointer: char * word; and used scanf to read input from the keyboard: ..

When to use malloc for char pointers

I'm specifically focused on when to use malloc on char pointers char *ptr; ptr = "something"; ...code... ...code... ptr = "something else"; Would a malloc be in order for something as trivial as th..

strdup() - what does it do in C?

What is the purpose of the strdup() function in C?..

warning: assignment makes integer from pointer without a cast

When I declare a char * to a fixed string and reuse the pointer to point to another string /* initial declaration */ char *src = "abcdefghijklmnop"; ..... /* I get the "warning: assignment makes i..

C++ preprocessor __VA_ARGS__ number of arguments

Simple question for which I could not find answer on the net. In variadic argument macros, how to find the number of arguments? I am okay with boost preprocessor, if it has the solution. If it makes..

do { ... } while (0) — what is it good for?

Possible Duplicate: Why are there sometimes meaningless do/while and if/else statements in C/C++ macros? I've been seeing that expression for over 10 years now. I've been trying to think wh..

How do I list the symbols in a .so file

How do I list the symbols being exported from a .so file? If possible, I'd also like to know their source (e.g. if they are pulled in from a static library). I'm using gcc 4.0.2, if that makes a dif..

Do I cast the result of malloc?

In this question, someone suggested in a comment that I should not cast the result of malloc, i.e. int *sieve = malloc(sizeof(int) * length); rather than: int *sieve = (int *) malloc(sizeof(int) *..

What is the difference between const int, const int const, and int const *?

I always mess up how to use const int*, const int * const, and int const * correctly. Is there a set of rules defining what you can and cannot do? I want to know all the do's and all don'ts in terms ..

What does this GCC error "... relocation truncated to fit..." mean?

I am programming the host side of a host-accelerator system. The host runs on the PC under Ubuntu Linux and communicates with the embedded hardware via a USB connection. The communication is performed..

How to make child process die after parent exits?

Suppose I have a process which spawns exactly one child process. Now when the parent process exits for whatever reason (normally or abnormally, by kill, ^C, assert failure or anything else) I want the..

Why aren't programs written in Assembly more often?

It seems to be a mainstream opinion that assembly programming takes longer and is more difficult to program in than a higher level language such as C. Therefore it seems to be recommend or assumed tha..

Warning: X may be used uninitialized in this function

I am writing a custom "vector" struct. I do not understand why I'm getting a Warning: "one" may be used uninitialized here. This is my vector.h file #ifndef VECTOR_H #define VECTOR_H typedef struct..

How to Convert double to int in C?

double a; a = 3669.0; int b; b = a; I am getting 3668 in b, instead of 3669. How do I fix This problem? And if have 3559.8 like that also I want like 3559 not 3560...

How to convert a string to character array in c (or) how to extract a single char form string?

I need to convert a string to a char array in C; how can I do this? Or at least, how can I extract single chars from a string incrementally?..

How to split a string to 2 strings in C

I was wondering how you could take 1 string, split it into 2 with a delimiter, such as space, and assign the 2 parts to 2 separate strings. I've tried using strtok() but to no avail. ..

Why should we typedef a struct so often in C?

I have seen many programs consisting of structures like the one below typedef struct { int i; char k; } elem; elem user; Why is it needed so often? Any specific reason or applicable area?..

What is the difference between a static and const variable?

Can someone explain the difference between a static and const variable?..

Converting from signed char to unsigned char and back again?

I'm working with JNI and have an array of type jbyte, where jbyte is represented as an signed char i.e. ranging from -128 to 127. The jbytes represent image pixels. For image processing, we usually wa..

How to convert an int to string in C?

How do you convert an int (integer) to a string? I'm trying to make a function that converts the data of a struct into a string to save it in a file...

Proper way to empty a C-String

I've been working on a project in C that requires me to mess around with strings a lot. Normally, I do program in C++, so this is a bit different than just saying string.empty(). I'm wondering what ..

C library function to perform sort

Is there any library function available in C standard library to do sort? ..

How to read numbers separated by space using scanf

I want to read numbers(integer type) separated by spaces using scanf() function. I have read the following: C, reading multiple numbers from single input line (scanf?) how to read scanf with spaces ..

How can I do GUI programming in C?

I want to do Graphics programming in C. I had searched a lot about the compiler that provides a rich set of functions for doing GUI programming in C, but I couldn't find anything. Basically I want to..

char *array and char array[]

if I write this char *array = "One good thing about music"; I actually create an array? I mean it's the same like this? char array[] = {"One", "good", "thing", "about", "music"}; ..

Printing hexadecimal characters in C

I'm trying to read in a line of characters, then print out the hexadecimal equivalent of the characters. For example, if I have a string that is "0xc0 0xc0 abc123", where the first 2 characters are c..

Read .csv file in C

I have a .csv file : lp;imie;nazwisko;ulica;numer;kod;miejscowosc;telefon;email;data_ur 1;Jan;Kowalski;ul. Nowa;1a;11-234;Budry;123-123-456;[email protected];1980.05.13 2;Jerzy;Nowak;ul. Konopnicka;13a/3;00-..

Why does scanf() need "%lf" for doubles, when printf() is okay with just "%f"?

Why is it that scanf() needs the l in "%lf" when reading a double, when printf() can use "%f" regardless of whether its argument is a double or a float? Example code: double d; scanf("%lf", &d);..

clearing a char array c

I thought by setting the first element to a null would clear the entire contents of a char array. char my_custom_data[40] = "Hello!"; my_custom_data[0] = '\0'; However, this only sets the first ele..

Undefined reference to `sin`

I have the following code (stripped down to the bare basics for this question): #include<stdio.h> #include<math.h> double f1(double x) { double res = sin(x); return 0; } /* The ..

What does it mean to write to stdout in C?

Does a program that writes to "stdout" write to a file? the screen? I don't understand what it means to write to stdout...

How to draw text using only OpenGL methods?

I don't have the option to use but OpenGL methods (that is glxxx() methods). I need to draw text using gl methods only. After reading the red book, I understand that it is possible only through the gl..

The real difference between "int" and "unsigned int"

int: The 32-bit int data type can hold integer values in the range of -2,147,483,648 to 2,147,483,647. You may also refer to this data type as signed int or signed. unsigned int : The 32-bit uns..

How to convert an integer to a character array using C

I want to convert an integer number to a character array in C. Input: int num = 221234; The result is equivalent to: char arr[6]; arr[0] = '2'; arr[1] = '2'; arr[2] = '1'; arr[3] = '2'; arr[4] = '3';..

What is a "static" function in C?

The question was about plain c functions, not c++ static methods, as clarified in comments. I understand what a static variable is, but what is a static function? And why is it that if I declare a f..

Tokenizing strings in C

I have been trying to tokenize a string using SPACE as delimiter but it doesn't work. Does any one have suggestion on why it doesn't work? Edit: tokenizing using: strtok(string, " "); The code is ..

uint8_t vs unsigned char

What is the advantage of using uint8_t over unsigned char in C? I know that on almost every system uint8_t is just a typedef for unsigned char, so why use it?..

How do you implement a class in C?

Assuming I have to use C (no C++ or object oriented compilers) and I don't have dynamic memory allocation, what are some techniques I can use to implement a class, or a good approximation of a class? ..

Build a simple HTTP server in C

I need to build a simple HTTP server in C. Any guidance? Links? Samples?..

How to convert integer to char in C?

How to convert integer to char in C?..

Difference between "while" loop and "do while" loop

What is the difference between while loop and do while loop. I used to think both are completely same.Then I came across following piece of code: do { printf("Word length... "); ..

C: How to free nodes in the linked list?

How will I free the nodes allocated in another function? struct node { int data; struct node* next; }; struct node* buildList() { struct node* head = NULL; struct node* second = NULL..

The "backspace" escape character '\b': unexpected behavior?

So I'm finally reading through K&R, and I learned something within the first few pages, that there is a backspace escape character, \b. So I go to test it out, and there is some very odd behavior..

How to prevent scanf causing a buffer overflow in C?

I use this code: while ( scanf("%s", buf) == 1 ){ What would be the best way to prevent possible buffer overflow so that it can be passed strings of random lengths? I know I can limit the input s..

How to use EOF to run through a text file in C?

I have a text file that has strings on each line. I want to increment a number for each line in the text file, but when it reaches the end of the file it obviously needs to stop. I've tried doing some..

In C/C++ what's the simplest way to reverse the order of bits in a byte?

While there are multiple ways to reverse bit order in a byte, I'm curious as to what is the "simplest" for a developer to implement. And by reversing I mean: 1110 -> 0111 0010 -> 0100 This i..

segmentation fault : 11

I'm having a problem with some program, I have searched about segmentation faults, by I don't understand them quite well, the only thing I know is that presumably I am trying to access some memory I s..

What REALLY happens when you don't free after malloc?

This has been something that has bothered me for ages now. We are all taught in school (at least, I was) that you MUST free every pointer that is allocated. I'm a bit curious, though, about the real..

How to free memory from char array in C

I created a char array like so: char arr[3] = "bo"; How do I free the memory associated with array I named "arr"?..

How to get the string size in bytes?

As the title implies, my question is how to get the size of a string in C. Is it good to use sizeof if I've declared it (the string) in a function without malloc in it? Or, if I've declared it as a po..

C Linking Error: undefined reference to 'main'

I have read the other answers on this topic, and unfortunately they have not helped me. I am attempting to link several c programs together, and I am getting an error in response: $ gcc -o runexp.o s..

How to compile a static library in Linux?

I have a question: How to compile a static library in Linux with gcc, i.e. I need to compile my source code into a file named out.a. Is it sufficient to simply compile with the command gcc -o out.a ou..

How to correctly assign a new string value?

I'm trying to understand how to solve this trivial problem in C, in the cleanest/safest way. Here's my example: #include <stdio.h> int main(int argc, char *argv[]) { typedef struct { ..

How can I create C header files

I want to be able to create a collection of functions in a header file that I could #include in one of my C Programs...

How to initialize a struct in accordance with C programming language standards

I want to initialize a struct element, split in declaration and initialization. This is what I have: typedef struct MY_TYPE { bool flag; short int value; double stuff; } MY_TYPE; void function..

Difference between static, auto, global and local variable in the context of c and c++

I’ve a bit confusion about static, auto, global and local variables. Somewhere I read that a static variable can only be accessed within the function, but they still exist (remain in the memory) af..

Recursive mkdir() system call on Unix

After reading the mkdir(2) man page for the Unix system call with that name, it appears that the call doesn't create intermediate directories in a path, only the last directory in the path. Is there a..

Speed comparison with Project Euler: C vs Python vs Erlang vs Haskell

I have taken Problem #12 from Project Euler as a programming exercise and to compare my (surely not optimal) implementations in C, Python, Erlang and Haskell. In order to get some higher execution tim..

Convert char * to LPWSTR

I am trying to convert a program for multibyte character to Unicode. I have gone through the program and preceded the string literals with L so they look like L"string". This has worked but I am now..

Fastest way to check if a file exist using standard C++/C++11/C?

I would like to find the fastest way to check if a file exist in standard C++11, C++, or C. I have thousands of files and before doing something on them I need to check if all of them exist. What can ..

How to set up a cron job to run an executable every hour?

I need to set up a cron job that runs an executable compiled using gcc once every hour. I logged in as root and typed crontab -e Then I entered the following and saved the file. 0 * * * * /path_to..

C function that counts lines in file

When I try to run my program, I get the wrong number of lines printed. LINES: 0 This is the output although I have five lines in my .txt file Here is my program: #include<stdio.h> #include&..

Why does the C preprocessor interpret the word "linux" as the constant "1"?

Why does the C preprocessor in GCC interpret the word linux (small letters) as the constant 1? test.c: #include <stdio.h> int main(void) { int linux = 5; return 0; } Result of..

Struct memory layout in C

I have a C# background. I am very much a newbie to a low-level language like C. In C#, struct's memory is laid out by the compiler by default. The compiler can re-order data fields or pad additional ..

Why is C so fast, and why aren't other languages as fast or faster?

In listening to the StackOverflow podcast, the jab keeps coming up that "real programmers" write in C, and that C is so much faster because it's "close to the machine." Leaving the former assertion fo..

How do I check if an integer is even or odd?

How can I check if a given number is even or odd in C?..

Variably modified array at file scope

I want to create a constant static array to be used throughout my Objective-C implementation file similar to something like this at the top level of my ".m" file: static const int NUM_TYPES = 4; stat..

What is the newline character in the C language: \r or \n?

What is the newline character in C? I know that different OS have different line-ending characters, but they get translated into the C newline character. What is that character?..

Directly assigning values to C Pointers

I've just started learning C and I've been running some simple programs using MinGW for Windows to understand how pointers work. I tried the following: #include <stdio.h> int main(){ int *..

How to use nanosleep() in C? What are `tim.tv_sec` and `tim.tv_nsec`?

What is the use of tim.tv_sec and tim.tv_nsec in the following? How can I sleep execution for 500000 microseconds? #include <stdio.h> #include <time.h> int main() { struct timespec t..

What should be the sizeof(int) on a 64-bit machine?

Possible Duplicate: size of int, long, etc Does the size of an int depend on the compiler and/or processor? What decides the sizeof an integer? I'm using a 64-bit machine. $ uname -m x..

C Programming: How to read the whole file contents into a buffer

I want to write the full contents of a file into a buffer. The file actually only contains a string which i need to compare with a string. What would be the most efficient option which is portable ev..

Combining C++ and C - how does #ifdef __cplusplus work?

I'm working on a project that has a lot of legacy C code. We've started writing in C++, with the intent to eventually convert the legacy code, as well. I'm a little confused about how the C and C++ ..

How do function pointers in C work?

I had some experience lately with function pointers in C. So going on with the tradition of answering your own questions, I decided to make a small summary of the very basics, for those who need a qu..

C non-blocking keyboard input

I'm trying to write a program in C (on Linux) that loops until the user presses a key, but shouldn't require a keypress to continue each loop. Is there a simple way to do this? I figure I could possi..

How to convert a string to integer in C?

I am trying to find out if there is an alternative way of converting string to integer in C. I regularly pattern the following in my code. char s[] = "45"; int num = atoi(s); So, is there a bette..

What is the best free memory leak detector for a C/C++ program and its plug-in DLLs?

I have a .exe and many plug-in .dll modules that the .exe loads. (I have source for both.) A cross-platform (with source) solution would be ideal, but the platform can be narrowed to WinXP and Visual ..

Correct way to read a text file into a buffer in C?

I'm dealing with small text files that i want to read into a buffer while i process them, so i've come up with the following code: ... char source[1000000]; FILE *fp = fopen("TheFile.txt", "r"); if(..

When to use pthread_exit() and when to use pthread_join() in Linux?

I am new to pthreads, and I am trying to understand it. I saw some examples like the following. I could see that the main() is blocked by the API pthread_exit(), and I have seen examples where the m..

Difference between signed / unsigned char

So I know that the difference between a signed int and unsigned int is that a bit is used to signify if the number if positive or negative, but how does this apply to a char? How can a character be po..

How to use boolean datatype in C?

I was just writing code in C and it turns out it doesn't have a boolean/bool datatype. Is there any C library which I can include to give me the ability to return a boolean/bool datatype?..

lvalue required as left operand of assignment

Why am I getting lvalue required as left operand of assignment with a single string comparison? How can I fix this in C? if (strcmp("hello", "hello") = 0) Thanks!..

C: socket connection timeout

I have a simple program to check if a port is open, but I want to shorten the timeout length on the socket connection because the default is far too long. I'm not sure how to do this though. Here's th..

Using floats with sprintf() in embedded C

Guys, I want to know if float variables can be used in sprintf() function. Like, if we write: sprintf(str,"adc_read = %d \n",adc_read); where adc_read is an integer variable, it will store the str..

What is time(NULL) in C?

I learning about some basic C functions and have encountered time(NULL) in some manuals. What exactly does this mean?..

C multi-line macro: do/while(0) vs scope block

Possible Duplicates: What’s the use of do while(0) when we define a macro? Why are there sometimes meaningless do/while and if/else statements in C/C++ macros? do { … } while (0..

How to check if an excel cell is empty using Apache POI?

I am taking input from an excel sheet using Poi.jar and wanted to know how to check if a cell is empty or not. Right now I m using the below code. cell = myRow.getCell(3); if (cell != null) { ce..

Split a string using C++11

What would be easiest method to split a string using c++11? I've seen the method used by this post, but I feel that there ought to be a less verbose way of doing it using the new standard. Edit: I w..

Maintaining the final state at end of a CSS3 animation

I'm running an animation on some elements that are set to opacity: 0; in the CSS. The animation class is applied onClick, and, using keyframes, it changes the opacity from 0 to 1 (among other things)...

C++ initial value of reference to non-const must be an lvalue

I'm trying to send value into function using reference pointer but it gave me a completely non-obvious error to me #include "stdafx.h" #include <iostream> using namespace std; void test(float..

Close a div by clicking outside

I want to hide a div by clicking on the close link in it, or by clicking anywhere outside that div. I am trying following code, it opens and close the div by clicking close link properly, but if I ha..

Resize image in the wiki of GitHub using Markdown

I'm writing a wiki page on GitHub, and I'm using Markdown. My problem is that I'm putting a large image (this image is in its own repository) and I need resize it. I have tried different solutions,..

How to create Java gradle project

How to create Java Gradle project from command line? It should create standard maven folder layout like on the picture below. UPDATE: .1. From http://www.gradle.org/docs/current/userguide/tutori..

Python - A keyboard command to stop infinite loop?

Possible Duplicate: Why can't I handle a KeyboardInterrupt in python? I was playing around with some Python code and created an infinite loop: y = 0 x = -4 itersLeft = x while(itersLe..

How to pass optional arguments to a method in C++?

How to pass optional arguments to a method in C++ ? Any code snippet.....

How to get the selected value from RadioButtonList?

I have a RadioButtonList on my page that is populated via Data Binding <asp:RadioButtonList ID="rb" runat="server"> </asp:RadioButtonList> <asp:Button Text="Submit" OnClick="submit" ru..

ASP.NET MVC3 - textarea with @Html.EditorFor

I have ASP.NET MVC3 app and I have also form for add news. When VS2010 created default view I have only text inputs for string data, but I want to have textarea for news text. How I can do it with Raz..

Iterate over model instance field names and values in template

I'm trying to create a basic template to display the selected instance's field values, along with their names. Think of it as just a standard output of the values of that instance in table format, wi..

Finding the type of an object in C++

I have a class A and another class that inherits from it, B. I am overriding a function that accepts an object of type A as a parameter, so I have to accept an A. However, I later call functions that ..

Java ElasticSearch None of the configured nodes are available

Just downloaded and installed elasticsearch 1.3.2 in past hour Opened IP tables to port 9200 and 9300:9400 Set my computer name and ip in /etc/hosts Head Module and Paramedic Installed and running ..

Android Studio cannot resolve R in imported project?

I'm trying the new Android Studio. I've exported a project from eclipse, using the build gradle option. I've then imported it in Android Studio. The R.java file under gen has a j in a little red circl..

Bi-directional Map in Java?

I have a simple integer-to-string mapping in Java, but I need to be able to easily retrieve string from integer, and also integer from string. I've tried Map, but it can retrieve only string from inte..

Handling key-press events (F1-F12) using JavaScript and jQuery, cross-browser

I want to handle F1-F12 keys using JavaScript and jQuery. I am not sure what pitfalls there are to avoid, and I am not currently able to test implementations in any other browsers than Internet Explo..

Google Maps V3 - How to calculate the zoom level for a given bounds

I'm looking for a way to calculate the zoom level for a given bounds using the Google Maps V3 API, similar to getBoundsZoomLevel() in the V2 API. Here is what I want to do: // These are exact bounds..

PSEXEC, access denied errors

While I'm using PSEXEC.exe getting 'Access denied' error for remote systems. Any idea about how to solve this?..

Unrecognized attribute 'targetFramework'. Note that attribute names are case-sensitive

I just installed vs 2010, followed by IIS in window 7. when building a website in .net framework 4.0 and convert this into application in IIS then its shows this error If i remove the targetFramew..

WordPress query single post by slug

For the moment when I want to show a single post without using a loop I use this: <?php $post_id = 54; $queried_post = get_post($post_id); echo $queried_post->post_title; ?> The problem is..

IF a == true OR b == true statement

I can't find a way to have TWIG interpret the following conditional statement: {% if a == true or b == true %} do stuff {% endif %} Am I missing something or it's not possible?..

Android soft keyboard covers EditText field

Is there a way to make the screen scroll to allow the text field to be seen?..

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

I have Spring Boot web application. It's centered around RESTful approach. All configuration seems in place but for some reason MainController fails to handle request. It results in 404 error. How to ..

Creating a .p12 file

Using openssl, I've created a private key as follows: openssl genrsa -out myKey.pem Then, to generate the csr demanded by the CA, I've executed the following: openssl req -new -key myKey.pem -out ..

How do I check particular attributes exist or not in XML?

Part of the XML content: <section name="Header"> <placeholder name="HeaderPane"></placeholder> </section> <section name="Middle" split="20"> <placeholder name="C..

Generate Row Serial Numbers in SQL Query

I have a customer transaction table. I need to create a query that includes a serial number pseudo column. The serial number should be automatically reset and start over from 1 upon change in custome..

How do you concatenate Lists in C#?

If I have: List<string> myList1; List<string> myList2; myList1 = getMeAList(); // Checked myList1, it contains 4 strings myList2 = getMeAnotherList(); // Checked myList2, it contains 6 ..

How to unit test abstract classes: extend with stubs?

I was wondering how to unit test abstract classes, and classes that extend abstract classes. Should I test the abstract class by extending it, stubbing out the abstract methods, and then test all the..

Value Change Listener to JTextField

I want the message box to appear immediately after the user changes the value in the textfield. Currently, I need to hit the enter key to get the message box to pop out. Is there anything wrong with m..

Checking Bash exit status of several commands efficiently

Is there something similar to pipefail for multiple commands, like a 'try' statement but within bash. I would like to do something like this: echo "trying stuff" try { command1 command2 c..

How to read and write into file using JavaScript?

Can anybody give some sample code to read and write a file using JavaScript?..

How to remove and clear all localStorage data

I need to clear all data i set into localStorage. By this, I mean completely reset localStorage to null when users remove their accounts. How can i do that with a simple function? I tried this: fu..

EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0) on dispatch_semaphore_dispose

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I do this in a script: read direc <<< $(basename `pwd`) and I get: Syntax error: redirection unexpected in an ubuntu machine /bin/bash --version GNU bash, version 4.0.33(1)-release (x8..

How to sort an ArrayList?

I have a List of doubles in java and I want to sort ArrayList in descending order. Input ArrayList is as below: List<Double> testList = new ArrayList(); testList.add(0.5); testList.add(0.2); ..

Start systemd service after specific service?

I have a general question. How does one start a systemd unit *.service after a particular *.service has started successfully? More specific question is, how do I start website.service only after mong..

How can I change UIButton title color?

I create a button programmatically.......... button = [UIButton buttonWithType:UIButtonTypeRoundedRect]; [button addTarget:self action:@selector(aMethod:) forControlEvents:UIControlEventTouchDown]; [..

Visual Studio Community 2015 expiration date

I have downloaded the Visual Studio Community 2015 (free version) and I don't see when the expiration date is. I have tried to see the expiration date at Help Menu -> About Microsoft Visual Studio an..

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

Can anyone explain about the purpose of PRIMARY KEY, UNIQUE KEY and KEY, if it is put together in a single CREATE TABLE statement in MySQL? CREATE TABLE IF NOT EXISTS `tmp` ( `id` int(11) NOT NULL ..

PHP strtotime +1 month adding an extra month

I have a simple variable that adds one month to today: $endOfCycle = date("Y-m", strtotime("+1 month")); Today is January 2013, so I would expect to get back 2013-02 but I'm getting 2013-03 instead..

How to read an external local JSON file in JavaScript?

I have saved a JSON file in my local system and created a JavaScript file in order to read the JSON file and print data out. Here is the JSON file: {"resource":"A","literals&q..

How to fix Python Numpy/Pandas installation?

I would like to install Python Pandas library (0.8.1) on Mac OS X 10.6.8. This library needs Numpy>=1.6. I tried this $ sudo easy_install pandas Searching for pandas Reading http://pypi.python.org/s..

Best way to select random rows PostgreSQL

I want a random selection of rows in PostgreSQL, I tried this: select * from table where random() < 0.01; But some other recommend this: select * from table order by random() limit 1000; I ha..

Batch Extract path and filename from a variable

How can I extract path and filename from a variable? Setlocal EnableDelayedExpansion set file=C:\Users\l72rugschiri\Desktop\fs.cfg I want to do that without using any function or any GOTO. is it po..

Can pandas automatically recognize dates?

Today I was positively surprised by the fact that while reading data from a data file (for example) pandas is able to recognize types of values: df = pandas.read_csv('test.dat', delimiter=r"\s+", nam..

How to Force New Google Spreadsheets to refresh and recalculate?

There were some codes written for this purpose but with the new add-ons they are no longer applicable...

jQuery .search() to any string

I saw this code snippet: $("ul li").text().search(new RegExp("sometext", "i")); and wanted to know if this can be extended to any string? I want to accomplish the following, but it dosen't work: ..

H.264 file size for 1 hr of HD video

I'm looking for an order of magnitude estimate for expected on-disk file size for 1 hour of H.264 encoded HD video transcoded from HDV (HD on a MiniDV tape). I want to archive approximately 100 hours ..

Excel VBA Run Time Error '424' object required

I am totally new in VBA and coding in general, am trying to get data from cells from the same workbook (get framework path ...) and then to start application (QTP) and run tests. I am getting this er..

How to search a specific value in all tables (PostgreSQL)?

Is it possible to search every column of every table for a particular value in PostgreSQL? A similar question is available here for Oracle. ..

ORA-06550: line 1, column 7 (PL/SQL: Statement ignored) Error

I am getting following error for the stored procedure and not able to understand the issue (must be from db side) While googling, I found similar issues but couldn't get the solution. Can any one help..

How to read request body in an asp.net core webapi controller?

I'm trying to read the request body in the OnActionExecuting method, but I always get null for the body. var request = context.HttpContext.Request; var stream = new StreamReader(request.Body); var bod..

What are .a and .so files?

I'm currently trying to port a C application to AIX and am getting confused. What are .a and .so files and how are they used when building/running an application?..

How can I use jQuery to move a div across the screen

I need to make multiple divs move from right to left across the screen and stop when it gets to the edge. I have been playing with jQuery lately, and it seem like what I want can be done using that. ..

Unable to find the requested .Net Framework Data Provider. It may not be installed. - when following mvc3 asp.net tutorial

I am following the ASP.NET MVC 3 Music store application tutorial but I keep getting stuck in part 4: http://www.asp.net/mvc/tutorials/mvc-music-store-part-4. It keeps telling me that I do not have th..

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