[Mingw-users] Building a DLL wrapper

[Markku S. <mst...@cc...>]

Hi, I'm trying to build and load a DLL wrapper, which will log function calls
to another DLL. I haven't been able to find any GCC specific info on this
around the web. I built the example DLL application, which was explained on
MinGW web page, like this:

main.c
----
#include "hellolib.h"

int main ()
{
     tstfunc ();
     return (0);
}

hellolib.h
----
#ifdef BUILD_DLL
// the dll exports
# define EXPORT __declspec(dllexport)
#else
// the exe imports
# define EXPORT __declspec(dllimport)
#endif

// function to be imported/exported
EXPORT void tstfunc (void);

hellolib.c
----
#include <stdio.h>
#include "hellolib.h"

EXPORT void tstfunc (void)
{
     printf ("Hello\n");
}


So what steps do I need to take, to make a wrapper DLL using MinGW, and load
the DLL, when program is excecuted? What if I didn't have the hellolib source
code?