🚀 go-pugleaf

Hi,

  Can anybody offer tips on how to capture a screen image? I came across a
Delphi code 'ScreenShot', but have problem converting it to C++, anybody can
help?

Thanks,


procedure ScreenShot(hWindow: HWND; bm: TBitmap);
var
  Left, Top, Width, Height: Word;
  R: TRect;
  dc: HDC;
  lpPal: PLOGPALETTE;
begin
  {Check if valid window handle}
  if not IsWindow(hWindow) then Exit;
  {Retrieves the rectangular coordinates of the specified window}
  GetWindowRect(hWindow, R);
  Left := R.Left;
  Top := R.Top;
  Width := R.Right - R.Left;
  Height := R.Bottom - R.Top;

  bm.Width := Width;
  bm.Height := Height;
  {get the screen dc}
  dc := GetDc(0);
  if (dc = 0) then
  begin
    Exit;
  end;
  {do we have a palette device?}
  if (GetDeviceCaps(dc, RASTERCAPS) and
    RC_PALETTE = RC_PALETTE) then
  begin
    {allocate memory for a logical palette}
    GetMem(lpPal,
      SizeOf(TLOGPALETTE) +
    (255 * SizeOf(TPALETTEENTRY)));
    {zero it out to be neat}
    FillChar(lpPal^,
      SizeOf(TLOGPALETTE) +
    (255 * SizeOf(TPALETTEENTRY)),
      #0);
    {fill in the palette version}
    lpPal^.palVersion := $300;
    {grab the system palette entries}
    lpPal^.palNumEntries :=
      GetSystemPaletteEntries(dc,
      0,
      256,
      lpPal^.palPalEntry);
    if (lpPal^.PalNumEntries <> 0) then
    begin
      {create the palette}
      bm.Palette := CreatePalette(lpPal^);
    end;
    FreeMem(lpPal, SizeOf(TLOGPALETTE) +
    (255 * SizeOf(TPALETTEENTRY)));
  end;
  {copy from the screen to the bitmap}
  BitBlt(bm.Canvas.Handle,
    0,
    0,
    Width,
    Height,
    Dc,
    Left,
    Top,
    SRCCOPY);
  {release the screen dc}
  ReleaseDc(0, dc);
end;