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Milquetoasty

Libgd Problem

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This code crashes on gdImageGifAnimBegin
#include <gd.h>
#include <string.h>

int main(int argc, CHAR ** argv)
{

    gdImagePtr im = gdImageCreate(100, 100);
    FILE * out = fopen("anim.gif", "wb");

    if(out)
    {
        gdImageGifAnimBegin(im, out, 1, -1);
        gdImageGifAnimEnd(out);
        fclose(out);
    }

    gdImageDestroy(im);
    return 0;
}
Unhandled exception at 0x7c918fea (ntdll.dll) in Stupid.exe: 0xC0000005: Access violation writing location 0x00000010. ntdll.dll!_RtlpWaitForCriticalSection@4() + 0x5b bytes ntdll.dll!_RtlEnterCriticalSection@4() + 0x46 bytes msvcrt.dll!__lock_file() + 0x33 bytes msvcrt.dll!_fwrite() + 0x14 bytes bgd.dll!1000c39a() I can't understand why it is failing on this section. I am using Microsoft Visual Studio 8, and the shared library DLL is compiled with VC6 under multithreaded mode Does anyone know why

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You are using a libgd function that uses a FILE * parameter. If you use the precompiled libgd DLL you need to use MSVC 6. Since you are using MSVC 8, you'll need to compile libgd yourself.

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Hi, this topic is oudated but I add the same problem recently. I found a way to avoid it.

The solution is simple, since the problem is with the FILE* definition, don't use the gd function that take a FILE* as parameter. Instead use their *Ptr equivalent.

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