7c3
Subj : Re: [For expert] Linker error
To   : borland.public.cpp.borlandcpp
From : Martin Gaeckler
Date : Wed Jun 08 2005 11:13 pm

remo schrieb:
> Hi,
> I have Borland c++ Builder 6.
> My application use a proprietary library for manage a camera.
> In my source code I use:
> .....
> long myerror = GetDevicePar(A, B);
> ....
> When I build the program I have this linker error:
> [Linker Error] Unresolved external '__stdcall GetDevicePar(.....) referenced
> from C:\....\Unit1.Obj
> 
> Now, I add to project the manage camera library, CAMERA.LIB, and build
> again. But I have a new error:
> 
> [Linker Error] C:\....\CAMERA.LIB contains invalid OMF record, type
> 0x21(possibly COFF)
> 
> So I use from console:
> 
> implib camera.DLL camera2.LIB
> 
> but the new library camera2.LIB = 11 KB
> , the old camera.LIB = 28 KB????
> 
> Now I add to project the new lib camera2.LIB and build again.
> But I have again the first linker Error :
> [Linker Error] Unresolved external '__stdcall GetDevicePar(.....) referenced
> from C:\....\Unit1.Obj
> 
> Last note: if I use from console: omf2coff camera.LIB camera3.LIB  the
> camera3.LIB = 3 KB!!???!!! and it NOT work.
> 
> I'M GOING CRAZY!!! HELP ME, PLEASE.

Hello,

I have to guess:

Try the following option:
Advanced Compiler -> Generate underscores

If this does not help, you may have run into a name mangling problem. To solve this: check the header file of your library:

You need the following extensions:

#ifdef __cplusplus
extern "C" {
#endif

// your prototypes:
long GetDevicePar( <type> A, <type> B);

#ifdef __cplusplus
};
#endif


Hope this helps.

Martin

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