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How to create and Use a Common Function Lib

Posted on 2004-08-05
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How do I access a function libaray in C++

I am creating  a MFC  DLL and LIB file of common functions I use across many projects

In VC6 using "C" I would do the following

I add the  project as a dependencie
extern "C" __declspec( dllexport ) int SetLayers (void);
__declspec( dllimport ) int SetLayers (void);

How should I do this using VS2003.net in C++ with a  MFC project
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Question by:MCofer
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by:millsoft
ID: 11731202
You can do it the same way in VS2003.
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Expert Comment

by:millsoft
ID: 11731204
If you've tried it and had problems please paste the code.
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Author Comment

by:MCofer
ID: 11731454
Yes, the dllexport /dllimport works. But Insted of using old stype "C" methods I am wanting to Know if there is a BETTER way to do  the same in C++
maybe using typelibs?
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millsoft earned 1000 total points
ID: 11731494
If you simply don't put "extern C", then the compiler/linker will treat the functions as C++ functions, and everything will work OK, including function overloading, etc.  You can even dllexport an entire class.

One caveat though: the DLL will only be accessible to a client program compiled by the same compiler/linker source that created the DLL.  This is because the internal function naming (mangling) is defined by the compiler authors (microsoft, whoever)... there is no standard.

The alternative for more general accessibility of your interface is to create COM  objects.

Brad
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Author Comment

by:MCofer
ID: 11731727
Thanks
Too Easy

Can you point me at more Info on creating a COM OBJ LIB

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