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| unit Unit1;
interface
uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls;
type TForm1 = class(TForm) ListBox1: TListBox; Button1: TButton; procedure FormCreate(Sender: TObject); procedure Button1Click(Sender: TObject); private procedure WMDisplayChange(var Message:TMessage); message WM_DISPLAYCHANGE; public end;
var Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.FormCreate(Sender: TObject); var i : Integer; DevMode : TDevMode; begin i:=0; while EnumDisplaySettings(nil,i,DevMode) do begin with Devmode do ListBox1.Items.Add(Format('%dx%d %dBit %dHerz', [dmPelsWidth, dmPelsHeight, dmBitsperPel, dmDisplayFrequency])); Inc(i); end;
end;
procedure TForm1.Button1Click(Sender: TObject); var DevMode : TDeviceMode; liRetValue : Longint; begin if EnumDisplaySettings(nil, Listbox1.ItemIndex,Devmode) then liRetValue := ChangeDisplaySettings (DevMode, CDS_UPDATEREGISTRY); SendMessage(HWND_BROADCAST, WM_DISPLAYCHANGE, SPI_SETNONCLIENTMETRICS, 0); end;
procedure TForm1.WMDisplayChange(var Message: TMessage); begin ShowMessage('Auflösung gewechselt'); inherited; end;
end. |