unresolved external symbols

I need to make use of a MFC function in a C program (windows environment) so i included
the header file (ie MFC.h) for the MFC function in the C file. when complied using Visual C++ 5.0 i have
unresolved externals symbols during linking. the unresolved external symbols belong to the
MFC function that i want to use. I have also tried to use extern but it doesnt help. And the MFC>h and MFC.cpp files have been added to the project space (using right click -> add files to project). Does
anyone has any idea? Thanks in advance.

Make sure that in Project / Settings, you have selected MFC from the "General" tab.

If you don't, then the appropriate libraries will not be linked, hence the unresolved externals.

Hope this helps.

I have done that too ie set the project setting to "USE MFC as SHARED DLL"

Also, the C program is already a DLL and the MFC code is a stand alone program.

Oh. Sorry. I don't have too much XP with DLL's.

Sometimes DevStudio is really annoying. Maybe a complete re-build will do the trick, if not then I don't know.

What exactly is your problem ?
What is exactly the unresolved external symbol ?
What do you mean with "MFC.H" ?

Perhaps more precise informations could help finding a solution to your problem.