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Thread: Calling a Procedure by its Win32 Pointer

  1. Oct 23rd, 2002, 02:48 PM #1
    Kevin_0011
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    Calling a Procedure by its Win32 Pointer

    How can I write a win32 dll file in TASM 5 which has procs in it that can be called from VB6 that will call a sub by the address passed to it (like from an OpenGl extension)
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  2. Oct 24th, 2002, 05:11 PM #2
    CornedBee
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    Your functions must heed the stdcall (pascal) calling convention:

    The parameters are passed from left to right. Number of bytes in the parameters is fixed. The called function is responsible for clearing the stack (using the ret n instruction).

    Use the call instruction to call the callback.

    The rest is about linker options.
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