opengl.h

#ifndef _GM_OPENGL_
#define _GM_OPENGL_
#include <windows.h>        // Header File For Windows
#include <glgl.h>          // Header File For The OpenGL32 Library
#include <glglu.h>         // Header File For The GLu32 Librar
#include <glglaux.h>       // Header File For The GLAUX Librar

#pragma comment(lib,"OpenGL32.lib")
#pragma comment(lib,"GLu32.lib")
#pragma comment(lib,"GLAUX.lib")

#endif

#ifdef glDG
#include <strsafe.h>
#include <windows.h>

void ErrorExit() 
{ 
    // Retrieve the system error message for the last-error code

    LPVOID lpMsgBuf;
    LPVOID lpDisplayBuf;
    DWORD dw = GetLastError(); 

    FormatMessage(
        FORMAT_MESSAGE_ALLOCATE_BUFFER | 
        FORMAT_MESSAGE_FROM_SYSTEM |
        FORMAT_MESSAGE_IGNORE_INSERTS,
        NULL,
        dw,
        MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
        (LPTSTR) &lpMsgBuf,
        0, NULL );

    // Display the error message and exit the process

    lpDisplayBuf = (LPVOID)LocalAlloc(LMEM_ZEROINIT, 
        (lstrlen((LPCTSTR)lpMsgBuf) + lstrlen((LPCTSTR)"fun") + 40) * sizeof(TCHAR)); 
    StringCchPrintf((LPTSTR)lpDisplayBuf, 
        LocalSize(lpDisplayBuf) / sizeof(TCHAR),
        TEXT("%s failed with error %d: %s"), 
        "fun", dw, lpMsgBuf); 
    MessageBox(NULL, (LPCTSTR)lpDisplayBuf, TEXT("Error"), MB_OK); 

    LocalFree(lpMsgBuf);
    LocalFree(lpDisplayBuf);
    ExitProcess(dw); 
}
#endif