// 1.Way:
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;
// 2. Way:
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;
// 3. Set the wallpaper for the Active Desktop.
{
You may have noticed that using SystemParametersInfo to change the wallpaper
when ActiveDesktop is turned on doesn't work. The reason is because you need
to use the IActiveDesktop COM interface. Using SystemParametersInfo still works,
but it doesn't update the wallpaper.
Requires Internet Explorer 4.0 or later).
}
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;
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