{
 Capturing a CLX form is easy, once you know.
 It took me a little time to find out, so I'm giving the knowledge to help others :
}
type
 TFormCapturable = class(TForm)
 public
  procedure PrintOne;
 end;
var
 FormCapturable: TFormCapturable;
implementation
uses
 Qt;
procedure TFormCapturable.PrintOne;
var
 aBitmap : TBitmap;
 aWinHandle : QWidgetH;
 aWinId : Cardinal;
 x, y, w, h : integer;
begin
 // create a new bitmap to hold the captured screen
 aBitMap := TBitmap.Create;
 try
  // get a handle on the desktop
  aWinHandle := QApplication_desktop;
  // get the Id from the desktop handle
  aWinId := QWidget_winId( aWinHandle);
  // get the position and size of the windows
  x := Self.Left;
  y := Self.;
  w := Self.Width;
  h := Self.Height;
  // capture the window into the bitmap's pixmap
  QPixmap_grabWindow( aBitmap.Handle, aWinId, x, y, w, h);
  // save the bitmap
  aBitMap.SaveToFile( 'c:\temp\test.bmp');
 finally
  // don't forget to kill the bitmap after use.
  FreeAndNil( aBitMap);
 end;
end;