ColorToRGB (Delphi)

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Description

The following code converts the color of the current form, Form1, to a Windows RGB value.

Code

const
  NumPaletteEntries = 20;
var
  FPaletteEntries: array[0..NumPaletteEntries - 1] of TPaletteEntry;

procedure TForm1.Button1Click(Sender: TObject);
var
  I: Integer;
  Result: Integer;
  RealColor, paletteColor: TColor;
begin
  Result := 0;
  I := 0;
  RealColor := Graphics.ColorToRGB(Form1.Color);
  while I < NumPaletteEntries do
  begin
    with FPaletteEntries[I] do
    begin
      paletteColor:= TColor(RGB(peRed, peGreen, peBlue));
      if RealColor = paletteColor then
      begin
        Label1.Caption := IntToStr(I);
        RedEdit.Text:= IntToStr(peRed);
        GreenEdit.Text:= IntToStr(peGreen);
        BlueEdit.Text:= IntToStr(peBlue);
        Exit;
      end;
    end;
    Inc(I)
  end;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  Form1.Color:=
    StrToInt(RedEdit.Text) shl 16 +
    StrToInt(GreenEdit.Text) shl 8 +
    StrToInt(BlueEdit.Text);
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  GetPaletteEntries(GetStockObject(DEFAULT_PALETTE), 0, NumPaletteEntries,
    FPaletteEntries);
  Form1.Color:= clMoneyGreen;
end;

Uses

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