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  • PSAPI weirdness

    From Gisle Vanem@giva@users.sourceforge.net to comp.os.ms-windows.misc on Sunday, August 03, 2003 14:42:43
    From Newsgroup: comp.os.ms-windows.misc

    I'm using PSAPI.DLL functions like EnumProcesses(). It works
    fine as long as I use the import library. But when I use dynamic
    binding via GetProcAddress() it crashes in trying to call my
    func-pointer. I'm using gcc + MingW. A small snippet:

    static BOOL (WINAPI *_EnumProcesses) (ULONG*, ULONG, ULONG*);

    ULONG processIds [256], numProcesses;

    if (!(*_EnumProcesses) (processIds, sizeof(processIds), &numProcesses))
    return (0);

    /* Crashes above */

    Results of LoadLibrary/GetProcAddress seems fine to me:

    LoadExtendedFuncs(): ntdll.dll, RtlInitUnicodeString -> 77F941F8 LoadExtendedFuncs(): ntdll.dll, RtlNtStatusToDosError -> 77F939A6 LoadExtendedFuncs(): psapi.dll, EnumProcesses -> 76BE2FCE
    LoadExtendedFuncs(): psapi.dll, EnumProcessModules -> 76BE1913 LoadExtendedFuncs(): psapi.dll, GetModuleFileNameExA -> 76BE1A45

    My other func-pointer seems okay. Here's the register dump from DrMingW:

    sof.exe caused an Access Violation at location 76be2fce Reading from location 76be2fce.

    Registers:
    eax=76be2fce ebx=003d3cb8 ecx=00000000 edx=00000000 esi=00000020 edi=0022fee8 eip=76be2fce esp=0022f4fc ebp=0022fe58 iopl=0 nv up ei pl nz ac po nc cs=001b ss=0023 ds=0023 es=0023 fs=0038 gs=0000 efl=00000216

    if (!(*_EnumProcesses) (processIds, sizeof(processIds), &numProcesses))
    return (0);

    Any ideas?

    -- gv


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