Getting a function pointer to a dynamic library in C (C89)

Question

I have a function pointer to a dynamic library,

#include <GL/gl.h> /* or something */ void (*vertex)(float, float) = &glVertex2f;

On GCCi686-apple-darwin10-gcc-4.2.1 it's always worked, but fails on Visual Studio 2010 with,

error 'vertex': address of dllimport 'glVertex2f' is not static

I have it configured for C89; I believe that's the only C available. The idea is that I want to invoke the function pointer as an extern in other files that do not include the library headers.

Neil Edelman · Accepted Answer · 2013-07-10 17:18:24Z

#include <GL/gl.h> void (*vertex)(float, float);

and explicitly,

int main(int argc, char **argv) { vertex = &glVertex2f; ... }

fixes the error.

ams · Accepted Answer · 2013-07-10 10:44:24Z

Windows DLLs do not work like BSD/Linux shared libraries :(

I believe you need the GetProcAddress function.

This link was just pulled from Google: http://msdn.microsoft.com/en-us/library/ms683212(v=vs.85).aspx

This looks promising, but I am not including Windows.h if I can possibly avoid it.

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