Re: linking to VC++ Dll's (_stdcall)

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#10302

From: Remy Lebeau (TeamB)
Date: Fri, 23 Apr 2004 00:19

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"Kevin Johnson" <kevjson@hotmail.com> wrote in message
news:408802ed$1@newsgroups.borland.com...

> I've defined my typedefs as:
>
>    typedef __declspec(dllimport) short Inp32(short PortAddress);
>    typedef __declspec(dllimport) void Out32(short PortAddress, short
data);

That is not correct.  It should be like this instead:

    typedef short __stdcall (*Inp32Ptr)(short PortAddress);
    typedef void __stdcall (*Out32Ptr)(short PortAddress, short data);

    Inp32Ptr *Input;
    Out32Ptr *Output;

> However when I call Output and get an "application-defined"
> exception (code 0c0000029) at 0x77fb1e0c.

That is probably because you did not set up the typedefs correctly.  When
you call the functions, you are actually not using the __Stdcall convention
at all, and as such you are corrupting the stack, so anything can happen
because you have undefined behavior in your code from that point on.


Gambit

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Subject: Re: linking to VC++ Dll's (_stdcall)
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