From: sos AT prospect DOT com DOT ru (Sergey Okhapkin)
Subject: RE: dll question
29 May 1998 00:45:32 -0700
Message-ID: <01BD8A77.B3BFBA70.cygnus.gnu-win32@sos>
To: "gnu-win32 AT cygnus DOT com" <gnu-win32 AT cygnus DOT com>,
        "'Tim Newsham'"
	 <newsham AT lava DOT net>

Tim Newsham wrote:
> This much seems to work properly.  I am having problems, however, when
> I try to actually call one of the procedures.  The stack pointer (esp)
> seems to be incorrect after a call to the procedure.  In particular
> I am passing in 3 4-byte arguments (12 bytes).  The emitted code
> looks like:
> 
>     <push args>
>     call *%ebx
>     addl %0xc, %esp
> 

You have to declare called functions as __stdcall. For example:

int __stdcall (*fptr)(int a, int b, int c);

....
fptr = GetProcAddress(dllhandle, "functionname");
(*fptr)(par1, par2, par3);

This case the emitted code will look like:
<push args>
call *%ebx

Stdcall function removes from stack pushed arguments itself.

-- 
Sergey Okhapkin, http://www.lexa.ru/sos
Moscow, Russia


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