Change Desktop Wallpaper

Beispiel 1 :

uses Registry;

//

procedure SetWallpaper(sWallPaperBMPPath: string; bTile: Boolean);
var
  reg: TRegIniFile;
begin
  reg := TRegIniFile.Create('Control Panel\Desktop');
  try
    with reg do
    begin
      WriteString('', 'Wallpaper', sWallPaperBMPPath);
      WriteString('', 'TileWallpaper', IntToStr(Ord(bTile)));
    end;
  finally
    reg.Free;
  end;
  SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, nil, SPIF_SENDWININICHANGE);
end;

Beispiel 2 :

procedure TForm1.Button1Click(Sender: TObject);
var
  sWallPaperBMPPath: string;
begin
  sWallPaperBMPPath := 'C:\[WinDIR]\wall.bmp';
  if not SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, Pointer(sWallPaperBMPPath),
    SPIF_SENDWININICHANGE) then
    ShowMessage('Succesful.')
  else
    ShowMessage('Failed!');
end;

Beispiel 3 :

uses  ShlObj, ComObj;

//

function ChangeWallpaper(aFile: String): Boolean;
const
  CLSID_ActiveDesktop: TGUID = '{75048700-EF1F-11D0-9888-006097DEACF9}';
var
  hObj: IUnknown;
  ADesktop: IActiveDesktop;
  str: string;
  wstr: PWideChar;
begin
  hObj     := CreateComObject(CLSID_ActiveDesktop);
  ADesktop := hObj as IActiveDesktop;
  wstr := AllocMem(MAX_PATH);
  try
    StringToWideChar(aFile, wstr, MAX_PATH);
    ADesktop.SetWallpaper(wstr, 0);
    ADesktop.ApplyChanges(AD_APPLY_ALL or AD_APPLY_FORCE);
  finally
    FreeMem(wstr);
  end;
end;