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Frequently Asked Questions

Chaning Windows Default Printer

Question:

How do I change the default Windows printer?

Answer:

You need to change the printer, driver, and port as listed in the
device key of the Windows section in the Win.ini file, then
broadcast a system wide WM_WININICHANGE message.

Example:

uses
  IniFiles;

procedure TForm1.Button1Click(Sender: TObject);
var
  WinIni : TIniFile;
  WinIniFileName : array[0..MAX_PATH] of char;
  s : array[0..64] of char;

begin
  GetWindowsDirectory(WinIniFileName, sizeof(WinIniFileName));
  StrCat(WinIniFileName, '\win.ini');
  WinIni := TIniFile.Create(WinIniFileName);
  try 
    WinIni.WriteString('windows',
                       'device',
                       'HP LaserJet Series II,HPPCL,LPT1:');
  finally
    WinIni.Free;
  end;

  StrCopy(S, 'windows');
  SendMessage(HWND_BROADCAST, WM_WININICHANGE, 0, LongInt(@S));
end;

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