How can I paint the whole form on a bitmap?

Question

I want to paint the whole form including its caption bar and frame on a TBitmap object.

GetFormImage is cool, but it has two problems:

Answer 1

The key to accessing non-client area is GetWindowDC function, everything else is blitting as usual:

procedure TForm5.FormClick(Sender: TObject);
var
  Bitmap: TBitmap;
  DC: HDC;
  FileName: string;
begin
  Bitmap := TBitmap.Create;
  try
    Assert(HandleAllocated);
    DC := GetWindowDC(Handle);
    Win32Check(DC <> 0);

    Bitmap.SetSize(Width, Height);

    Win32Check(BitBlt(Bitmap.Canvas.Handle, 0, 0, Width, Height, DC, 0, 0, SRCCOPY));

    FileName := Name + '.' + GraphicExtension(TBitmap);
    Bitmap.SaveToFile(FileName);

    ShellExecute(HWND_DESKTOP, nil, PChar(FileName), nil, nil, SW_NORMAL);
  finally
    ReleaseDC(Handle, DC);
    Bitmap.Free;
  end;
end;

For the second case of hidden (not painted!) window - see a comment from RRUZ.