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Asked: 2026-05-14T05:13:03+00:00

I have compiled a simple win32 app successfully with bc++ (2 lines excerpt only):

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I have compiled a simple win32 app successfully with bc++ (2 lines excerpt only):

LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);

wincl.lpfnWndProc = WindowProcedure;

Why can’t I rename WindowProcedure and compile this:

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM);

wincl.lpfnWndProc = WndProc;

as error message gives:

Turbo Incremental Link 5.00 Copyright
(c) 1997, 2000 Borland Error:
Unresolved external ‘stdcall
WndProc(HWND *, unsigned int,
unsigned int, long)’ referenced from
C:\PROGRAMMING\SALLY\WIN32TUTORIAL\MAIN.OBJ

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1 Answer

  1. Editorial Team

    This is a linker error, not a compiler error. It looks like you have renamed the declaration but not the definition. You need to rename the definition (the part that includes the {body of the function}).

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