Using dll exports in c++

[el-half]

I understand now, thanks.

#include <windows.h> 
#include <iostream> 

#define MAXMODULE 50 

typedef int (WINAPI*cfunc)(HWND, LPCTSTR, LPCTSTR, UINT); 


void main() { 

   HINSTANCE hLib=LoadLibrary("USER32.dll"); 
   cfunc DoSomething; 


   if(hLib==NULL) { 

      std::cout << "Unable to load library!" << std::endl; 
      std::cin.get(); 
      return; 
   } 

   char mod[MAXMODULE]; 

   GetModuleFileName((HMODULE)hLib, (LPTSTR)mod, MAXMODULE); 
   std::cout << "Library loaded: " << mod << std::endl; 


   DoSomething=(cfunc)GetProcAddress((HMODULE)hLib, "MessageBoxA"); 

   if((DoSomething==NULL)) { 
      std::cout << "Unable to load function(s)." << std::endl; 
      FreeLibrary((HMODULE)hLib); 
      return; 
   } 

   DoSomething(0, "Hello World!", "Information", MB_ICONINFORMATION); 

   FreeLibrary((HMODULE)hLib); 

   std::cin.get(); 
}

Someone else has provided me with this code, I simply forgot to give the correct typedef:
typedef int (WINAPI*cfunc)(HWND, LPCTSTR, LPCTSTR, UINT);