HRESULT WINAPI DirectDrawEnumerate(
  LPDDENUMCALLBACK lpCallback, 
  LPVOID lpContext
);

static BOOL WINAPI DriverAvailable(LPGUID guid, LPSTR desc,
		LPSTR name, LPVOID p );

static BOOL WINAPI DriverAvailable(LPGUID guid, LPSTR desc,
              LPSTR name, LPVOID p );

qtdlg::qtdlg(QWidget *parent):QDialog(parent) {
     DirectDrawEnumerate((LPDDENUMCALLBACK)DriverAvailable, this);
}

BOOL mfcdlg::OnInitDialog() {
   .....
   // to do: your extra initialization code here
   DirectDrawEnumerate((LPDDENUMCALLBACK)DriverAvailable, this);

   ......
}

BOOL WINAPI classname::DriverAvailable(LPGUID guid, LPSTR desc, LPSTR name, LPVOID p )
{
    DirectDrawWin* win = (DirectDrawWin*)p;

    if (win->totaldrivers >= MAXDRIVERS)
        return DDENUMRET_CANCEL;

    DriverInfo& info = win->driver[win->totaldrivers];

    if (guid)
    {
        info.guid = (GUID*)new BYTE[sizeof(GUID)];
        memcpy(info.guid, guid, sizeof(GUID));
    }
    else
        info.guid=0;

    info.desc = strdup(desc);
    info.name = strdup(name);

    win->totaldrivers++;

    return DDENUMRET_OK;
}

BOOL WINAPI MyDlg::DriverAvailable(LPGUID guid, LPSTR desc, LPSTR name, LPVOID p )
{
    return ((MyDlg*)p)->MyDriverAvailable(guid, desc, name);
}