SystemParametersInfo

I write a program that change windows desktop using
SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, 0, Pchar('Bitmap.Bmp'), SPIF_SENDWININICHANGE)
This work when I execute the program from Delphi IDE but if I execute it from menu this return ErrorCode 2
poc3796Asked:
Who is Participating?
 
viktornetCommented:
Hello..Here is the full coding........
---------------
uses registry;
procedure SetWallPaper(sWallpaperBMPPath : String; bTile : Boolean);
var
  Reg : TRegistry;
begin
  Reg := TRegistry.Create;
  try
    Reg.RootKey := HKEY_CURRENT_USER;
    Reg.OpenKey('\Control Panel\Desktop', False);
    Reg.WriteString('Wallpaper', sWallpaperBMPPath);
    Reg.WriteString('TileWallpaper', IntToStr(Word(bTile)));
  finally
    reg.CloseKey;
    Reg.Free;
  end;
    SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, Nil,
      SPIF_SENDWININICHANGE);
end;
procedure TForm1.PNLButton1Click(Sender: TObject);
begin
  SetWallpaper('C:\windows\Forest.bmp', False);
end;
---------------
Regards,
Viktor Ivanov
0
 
MadshiCommented:
Have you tried 'c:\windows\bitmap.bmp'?
ErrorCode=2 means "File not found" or something like that, I think. But I'm not sure.

Regards, Madshi.
0
 
viktornetCommented:
Try this......
SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, 0,   Pchar('C:\windows\desktop\YourFolder\Bitmap.Bmp'),
     SPIF_SENDWININICHANGE);

if it still isn't working try this.....
  SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, 0,       Pointer('C:\windows\desktop\YourFolder\Bitmap.Bmp'),
     SPIF_SENDWININICHANGE);

0
Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

 
viktornetCommented:
If you have saved the project and the bitmap is in your folder then you can use Bitmap.bmp
if you haven't saved the project and you are trying to do Bitmap.bmp it is looking in the Delphi folder and isn't finding the bitmap...so you need to extended and give the exact path to the bitmap.....

Regards,
Viktor Ivanov
0
 
poc3796Author Commented:
with Pointer cluase the program is not compiled, and the strange thing is that
SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, Pchar('Bitmap.Bmp'), SPIF_SENDWININICHANGE)
WORK in IDE .....
0
 
viktornetCommented:
Why don't you try this........
---------------------
uses Windows, registry;
procedure SetWallPaper(sWallpaperBMPPath : String; bTile : Boolean);
var
  reg : TRegIniFile;
begin
  reg : TRegIniFile.Create('Control Panel\Dekstop');
  with reg do
  begin
    WriteString('', 'Wallpaper', sWallpaperBMPPath);
    if bTile then
    begin
      WriteString('', 'TileWallpaper', '1');
    end
    else
    begin
      WriteString('', 'TileWallpaper', '0');
    end;
  end;
  reg.Free;
  SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, Nil, SPIF_SENDWININICHANGE);
end;

Example Call : SetWallpaper('C:\Windows\desktop\MyBitmap.bmp', False);
--------------
Regards,
Viktor Ivanov
0
 
poc3796Author Commented:
I drag & drop your procedure in my program but this don't work also in IDE [but this is compiled].

I try this:

procedure TForm1.Button1Click(Sender: TObject);
var cString: String;
begin
    cString := 'D:\temp\sfondo2.BMP';
    if FileExists( cString ) then
        if not( SystemParametersInfo( SPI_SETDESKWALLPAPER, 0, Pchar( cString ), SPIF_SENDWININICHANGE) ) then
            MessageBox( 0, PChar( Format( '%d', [GetLastError()] )), 'Errore', MB_OKCANCEL + MB_DEFBUTTON1);
end;

procedure TForm1.Button2Click(Sender: TObject);
var cString: String;
begin
    SetWallPaper( 'D:\DOWNLOAD\SFONDI~1\manab0~1.BMP', False );
end;

// *--------------------------------------------------------------------------
procedure SetWallPaper(sWallpaperBMPPath : String; bTile : Boolean);
var
  reg : TRegIniFile;
begin
  reg := TRegIniFile.Create('Control Panel\Dekstop');
  with reg do
  begin
    WriteString('', 'Wallpaper', sWallpaperBMPPath);
    if bTile then
    begin
      WriteString('', 'TileWallpaper', '1');
    end
    else
    begin
      WriteString('', 'TileWallpaper', '0');
    end;
  end;
  reg.Free;
  SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, Nil, SPIF_SENDWININICHANGE);
end;

Bottom1Click work in IDE evironment
Bottom2Click don't work at all

regards
poc3796
0
 
poc3796Author Commented:
Excuse me in the fast try that I do I don't see that you write DEKSTOP other than DESKTOP when I correct your code work well

Repost an answer and I accept it

Excuse me
0
 
poc3796Author Commented:
Excuse me in the fast try that I do I don't see that you write DEKSTOP other than DESKTOP when I correct your code work well

Repost an answer and I accept it

Excuse me
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.