CreateProcess() came up a few times searching google.... Is it OK to assume this is the safest and most efficient method? If so, I would like to use the output of the called process. How do I know it has completed before continuing on in the C program? Thanks. ...
I have command line utility written in ANSI C on a Mac with a function to create a bubble sorted array for a single-linked list. I declared the loop variables. int a = 0; int b = 0; I wrote the bubble sort for loops in the abbreviated style (i.e., leaving the variable initialization empty). for ( ; a < size; a++) for( ; b < s...
I'm embedding a Lua interpreter in my current project (written in C) and I am looking for an example of how to handle errors. This is what I have so far... if(0 != setjmp(jmpbuffer)) /* Where does this buffer come from ? */ { printf("Aargh an error!\n"); return; } lua_getfield(L, LUA_GLOBALSINDEX, "myfunction"); lua_call(L, 0, 0);...
Calling system() to run an external .exe and checking error code upon errors: #include <errno.h> #include <stdlib.h> function() { errno_t err; if( system(tailCmd) == -1) //if there is an error get errno { //Error calling tail.exe _get_errno( &err ); } } First two compile errors: ...
Hi. I'm working on a project that's supposed to work on both Windows and Linux (with an unofficial Mac port as well) that emulates a true colour system console. My problem is that recently there appeared a request for textfield support (yes, console-based) and it would be cool to add the possibility of copying text to clipboard and past...
Does any know of any C/C++ open source for XPS [XML Print Specification]. I found http://www.ndesk.org/Xps, but it is c# ... Any help will be highly appreciated. ...
So i'm working on a program, wich is vaguely going to resemble Br@y's Terminal, but running from the commandline in linux It will do asynchronous transmission, out the serial (Com) port. Now i think the Header/library i need for this is the termios.h Now i've only used posix a little before and i;m finding it rather heavy going digging...
I'm using GLib Hash Table. I'm trying to get the current value of the key that I found and then increment its value. I'm not quite sure how can I replace the existing value. typedef struct { gchar *key; guint my_int; } my_struct; char *v; v = g_hash_table_lookup(table, my_struct.key); if (v == NULL) g_hash_table_insert(tab...
Hello, gcc 4.4.2 c89 I am have been re-engineering some one else's source code. In a function someone has declared some static variables, but doesn't seem to serve any purpose of having them static. I am just wondering if my comment below would be accurate? static char tempstr[64]; For my understanding when declaring static variab...
Help me in solving 2 questions on pointers: 1)Please tell me why do I get 'segmentation fault' when I run following snippet main() { char *str1 = "united"; char *str2 ="front"; char *str3; str3 = strcat(str1,str2); printf("\n%s",str3); } 2)Why don't I get output in following code: main() { ...
I'm working on an application which builds and runs fine in Win32. However, in x64, it builds but crashes on run. Looking at the code and narrowing down the problem, if I comment out the call to the below function, it runs with no problem. void vec3_copy (double* v1, const double* v2) { v1[0] = v2[0]; v1[1] = v2[1]; v1[2] = v2[2];...
Please explain this type signature. ...
I'm trying to debug a program I've written. According to the debugger a particular void * holds the value 0x804b008. I'd like to be able to dereference this value (cast it to an int * and get it's value). I'm getting a Segmentation Error with this code. (The program with the void * is still running in the background btw - it's 'paused')...
Is there a difference if I compile the following program using c89 vs c99? I get the same output. Is there really a difference between the two? #include <stdio.h> int main () { // Print string to screen. printf ("Hello World\n"); } gcc -o helloworld -std=c99 helloworld.c vs gcc -o helloworld -std=c89 hellowor...
Hi all, Learning to use the fork() command and how to pipe data between a parent and it's children. I am currently trying to write a simple program to test how the fork and pipe functions work. My problem seems to be the correct use/placement of the wait function. I want the parent to wait for both of its children to finish processing. ...
I am having problem referring to the file path in Windows XP (SP2). Actually I want to run an exe file from a specified path say "C:\users\rakesh\Documents and settings\myexe.exe" in my program...I am using the function _wsystem("C:\users\rakesh\Documents and settings\myexe.exe") to run the file.. The problem is that it is not recognizin...
Why do I get -1 when I print the following? unsigned long long int largestIntegerInC = 18446744073709551615LL; printf ("largestIntegerInC = %d\n", largestIntegerInC); I know I should use llu instead of d, but why do I get -1 instead of 18446744073709551615LL? Is it because of overflow? ...
What is the best way to write a state machine in C? I usually write a big switch-case statement in a for(;;), with callbacks to re-enter the state machine when an external operation is finished. Do you know a more efficient way? ...
What is the difference between setjmp() and longjmp() in c++ i am confused ...
how to convert the utc time to local time of the day? ...