请问如何从DLL中导出函数....?

Question

GetProcAddress(GetModuleHandle("User32.dll"),"MessageBox");

Answer 1

int iReturnVal;
typedef int (CALLBACK* LPFNDLLFUNC1)(UINT);HINSTANCE hDLL;              // Handle to DLL
LPFNDLLFUNC1 lpfnDllFunc1;    // Function pointerhDLL = LoadLibrary("USER32.dll");
if (hDLL != NULL)
{
  lpfnDllFunc1 = (LPFNDLLFUNC1)GetProcAddress(hDLL,
                                          "MessageBeep");
  if (!lpfnDllFunc1)
  {
      // handle the error
      FreeLibrary(hDLL);      
      return 0;
  }
  else
  {
      // call the function
      iReturnVal = lpfnDllFunc1(MB_OK);
  FreeLibrary(hDLL);
  return (iReturnVal);
  }
}