i am trying to send a string HI to a server over UDP in a particular port and trying to receive a response. however, after i try to get the response using recvfrom() i was stuck in blocking state. i tried using connected udp but i got Error receiving in UDP: Connection refused what could be the reasons for this. the server i not i...
I need help on which random number generator to use simultaneously from multiple threads and get less execution time ...
I have a problem where Due to Shared memory, when MS Visual C 6.0 DLL crashes it also causes VB 6 EXE to crash. Our main program EXE is written in VB 6. It calls plug-ins (DLL's) for the various file types, these are written in MS Visual C 6.0. When a "C" plug-in (DLL) encounters a problem it some times crashes and this causes the EXE pr...
So in the meanwhile we know that double-checked-locking as is does not work in C++, at least not in a portable manner. I just realised I have a fragile implementation in a lazy-quadtree that I use for a terrain ray tracer. So I tried to find a way to still use lazy initialization in a safe manner, as I wouldn't like to quadruple memory ...
i'm new to ubuntu and i want to install webkit 1.0 as dev version but i don't know what i have to do ? ...
I am a newbie on optimization. I have been reading some reference on how to optimize c++ code but I have a hard time applying it to real code. Therefore I just want to gather some real world optimization technique on how to squeeze as much juice from the CPU/Memory as possible from the loop below double sum = 0, *array; array = (double*...
Hello Where can I find examples of code, written in "Unified Parallel C"? I also interested in normative documents about this language (standards, reference manuals, online-accessible books and courses). What extensions were added to C to get UPC? Is this dialect alive or dead? ...
Which method can be used to read one line at a time from a file in C. I have used fgets function also. but it's not working. it's reading space separated token only... What to do ??? ...
Is it possible to read in a string in C, without allocating an array of fixed size ahead of time? Everytime I declare a char array of some fixed size, I feel like I'm doing it wrong. I'm always taking a guess at what I think would be the maximum for my usecase, but this isn't always easy. Also, I don't like the idea of having a smalle...
I've read that it is bad practice to call strlen() in my for loop condition, because this is an O(N) operation. However, when looking at alternatives I see two possible solutions: int len = strlen(somestring); for(int i = 0; i < len; i++) { } or... for(int i = 0; somestring[i] != '\0'; i++) { } Now, the second option seems...
I need to call a function in an unmanaged .dll written in C lang from vb.net. The function declaration looks like this LONG _stdcall ReadInfo(char *reply); Now the behavior of this function is that it copies some data in argument "reply" and returns a numeric value which signals its pass/fail status. How do i pass it a string object so...
The Psyco docs say: Just for reference, Psyco does not work on any 64-bit systems at all. This fact is worth being noted again, now that the latest Mac OS/X 10.6 "Snow Leopart" comes with a default Python that is 64-bit on 64-bit machines. The only way to use Psyco on OS/X 10.6 is by recompiling a custom Python in 32-...
Hi, I'll be needing to use Hash Tables with different keys. One as string for the key and another as integer. As for the integer one, how stupid it is to run a hash function on the number to generate a key? I mean, the numbers I'll be using as key for the Hash Table will always be different, there will be no duplicates at all. Isn't e...
I am very new at C programming and I am working on a firmware application for my MCU. This method was working fine when I was using the KEIL compiler (Big Endian) but when I switched to the SDCC compiler (Little Endian) it is not working properly. Can someone please explain what I am doing wrong??? The target device is a Silicon Labs C8...
Is there a common portable idiom in numerics code (I'm writing in D, but language-agnostic, C and C++ answers would be useful to me, too) to ensure that all stack-allocated doubles that are accessed frequently are aligned on 8-byte boundaries? I'm currently optimizing some numerics code where misaligned stack-allocated doubles (only ali...
I think both is valid C syntax, but which is better? A) void func(int a[]); // Function prototype void func(int a[]) { /* ... */ } // Function definition or B) #define ARRAY_SIZE 5 void func(int a[ARRAY_SIZE]); // Function prototype void func(int a[ARRAY_SIZE]) { /* ... */ } // Function definition ...
Hi, I have a C application which provides a "shell" for entering commands. I'm trying to write some automated test-code for the application (Using CUnit). The "shell" input is read from stdin like so: fgets(buf, sizeof(buf), stdin); I can "write" commands automatically to the application by freopen()'ning stdin and hooking it to an i...
Hello, I'm trying to read the contents of a small text file using the common dialog box, pass the text in the file into a buffer and draw it to the form by invalidating the window and forcing the repaint. Everything works with exception to displaying the text on the screen, when I click on the OK button on the dialog box no text appear...
Given a function, let's say atoi, how can I find the header file I should include if I want to use this function ? I'm always get puzzled for that issue. If let me treat function like "atoi" as linux c api, I can put my question in another way as : Is a document for linux c api ? ...
I see that lwIP has some AutoIP (aka IPv4LL, aka RFC 3927) code, but I can't tell if it does anything higher up in the Zeroconf stack, namely mDNS and DNS-SD (with RFC 2782). So, does lwIP support DNS-SD service discovery? If not, would it be easy to port code from a project like Avahi that does (assuming licensing allows it)? ...