Title: to change the default printer in Windows
Question: How can I change the default printer in Windows?
Answer:
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;