Calling a function from a DLL

I've got a DLL that calls another function. The problem is that I don't know how to "glue" the function to the DLL. The DLL is

Code:

---

#include <stdio.h>
     
extern "C"
{

  __declspec (dllexport) double __stdcall testfunc (double a)
        {
 
      double b;       
          b = triple(a);         
          return b;
  }
 
}

---

and the function that I'm trying to "glue" to it is

Code:

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double triple (double a)
{
        double b;
        b = 3*a;

        return b;
}

---

I've tried to just put them in the same source file but that didn't seem to work. Any help with this is appreciated.

What do you mean by "it didn't seem to work"? Did you try putting triple() inside the extern "C" section? Not that it should make any difference if you're compiling as C, but still, it might help.

Yes.

That's one of my questions answered . . . but what about the other one? What happens when you try this? Are you compiling as C? Are you creating a DLL? Have you ever created DLLs before?

I have created DLLs before, though I don't understand them that well. It does compiles to an object file okay, but I get the following error when linking.

Code:

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... :main.c:(.text+0x104): undefined reference to 'WinMain@16'

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I've tried compiling as both C and C++. I've been able to create DLLs, just not with the subroutine.

oops, left out the -shared tag.

DLLs don't have WinMain. You must be trying to create a win app when you should be doing a dll. What compiler/IDE? Visual Studio?

MSVC++, probably. http://cboard.cprogramming.com/showthread.php?t=90979