int WINAPI WinMain(HINSTANCE hThisInst,
         HINSTANCE hPrevInst,
         LPSTR str,int nWinMode)
{
MSG msg;
WNDCLASS wcl;

wcl.hInstance=hThisInst;
wcl.lpszClassName = "OpenGLWinClass"; // <- Ошибка возникает сдесь
wcl.lpfnWndProc = WindowFunc;
wcl.style = CS_OWNDC | CS_HREDRAW | CS_VREDRAW;

wcl.hIcon = NULL;
wcl.hCursor = LoadCursor(NULL,IDC_ARROW);
wcl.lpszMenuName = NULL;

wcl.cbClsExtra = 0;
wcl.cbWndExtra = 0;

wcl.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
RegisterClass(&wcl);

hWnd = CreateWindow("OpenGLWinClass", "Win API Template",   
        WS_OVERLAPPEDWINDOW | WS_CLIPCHILDREN | WS_CLIPSIBLINGS,
        200,
        150,
        400,
        420,
        HWND_DESKTOP, NULL,
        hThisInst, NULL);

ShowWindow(hWnd,nWinMode);
UpdateWindow(hWnd);

while(1)
{
    while( PeekMessage(&msg,NULL,0,0,PM_NOREMOVE) )   
      if(GetMessage(&msg,NULL,0,0))
       {   
        TranslateMessage(&msg);
        DispatchMessage(&msg);
       }
      else
        return 0;

    display();
}   

return 0;
}