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// *** Erstellt von einem Formular ein ScreenShot ***
function FormularScreenShot(Bmp: TBitmap; h: hWnd): Boolean;
var
  Rec: TRect;
  iWidth, iHeight: Integer;
begin
  with Bmp do try
    GetWindowRect(h, Rec);

    iWidth  := Rec.Right - Rec.Left;
    iHeight := Rec.Bottom - Rec.Top;

    Width := iWidth;
    Height := iHeight;

    BitBlt(Canvas.Handle, 0, 0, iWidth, iHeight, GetWindowDC(h), 0, 0, SRCCOPY);

    result := True;
  finally
    ReleaseDC(h, GetWindowDC(h));
  end;
end;