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Re: calling function in DLL compiled with C++ [message #28996 is a reply to message #28857]

Thu, 24 January 2002 12:44

Richard Younger
Messages: 43
Registered: November 2000

Member

Dominik Paul wrote:
>
> Hi Richard,
>
> I allready tried the extern C construct. But then I got some problems,
> using other C++ routines in the DLL.
> So, this method didnt work for me.
>
> But Gregs suggestion was ok. The DLL is running now, thanks
> Dom

Hi Dom,

Glad you got everything working.

As an addendum, I was looking something up in my Windows programming
reference, and I stumbled upon something of interest. It seems that
even in straight C, the MSVC compiler mangles names (prepending an
underscore and tacking a @[# of bytes in parameters] onto the end) if
you're using the __stdcall calling convention, even if you extern "C"
your function calls. And yes, I agree that it's annoying.

The upshot is that using __declspec(dllexport) and __stdcall, you'd have
to call something like _MyGenData@12 instead of MyGenData. So, you can
either use a .def file like you are or include something like

#pragma comment(linker, "/export:MyGenData=_MyGenData@12")

to alias MyGenData to _MyGenData@12 in the DLL exports.

It seems like more trouble and work to do it this way than a .def file,
but I guess for anyone who wants to support multiple architecture
source, they can place it behind an #ifdef WIN32 or whatever, instead of
having to deal with the extra file and compiler options.

Just thought somebody somewhere might find some passing interest.

Best,
Rich

--
Richard Younger MIT Lincoln Laboratory
Phone: (781)981-4464 244 Wood St.
Fax: (781)981-0122 Lexington, MA 02421

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[Message index]

		calling function in DLL compiled with C++ By: Dominik[1] on Mon, 07 January 2002 05:11
		Re: calling function in DLL compiled with C++ By: Gert Van de Wouwer on Tue, 08 January 2002 02:46
		Re: calling function in DLL compiled with C++ By: Richard Younger on Thu, 10 January 2002 14:11
		Re: calling function in DLL compiled with C++ By: Dominik[1] on Mon, 14 January 2002 00:01
		Re: calling function in DLL compiled with C++ By: Richard Younger on Thu, 24 January 2002 12:44
		Re: calling function in DLL compiled with C++ By: wbiagiot on Wed, 06 February 2002 09:00

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