DEVMODE mydevmode;
 mydevmode.dmBitsPerPel = 16;
 mydevmode.dmFields = DM_BITSPERPEL;
 long rc = ChangeDisplaySettings( &mydevmode, CDS_FULLSCREEN);
 if (rc == DISP_CHANGE_SUCCESSFUL)
 {
   AfxMessageBox("成功", MB_OK);
 } 
 DEVMODE mydevmode;
 mydevmode.dmBitsPerPel = 16;
 mydevmode.dmFields = DM_BITSPERPEL;
 long rc = ChangeDisplaySettings( &mydevmode, CDS_FULLSCREEN);
 if (rc == DISP_CHANGE_SUCCESSFUL)
 {
   AfxMessageBox("成功", MB_OK);
 }