Scalabium Software

#32:How can I change the default printer in MS Windows?

If you want to change the the default printer in Windows OS, you must change
the device key in the Windows section of the WIN.INI. After that you must
send a WM_WININICHANGE message:

var
  strIni: array[0..MAX_PATH] of Char;
  arrWindows: array[0..64] of Char;
begin
  GetWindowsDirectory(strIni, SizeOf(strIni));
  StrCat(strIni, '\win.ini');
  with TIniFile.Create(strIni) do
    try
      WriteString('windows', 'device', 'HP LaserJet 4 Plus,HPPCL5MS,LPT1:');
    finally
      Free;
    end;

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

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October 20, 1999