//public List<String> GetInstalledPrintersManaged()
//{
// return PrinterSettings.InstalledPrinters.Cast<string>().ToList();
//}
private List <String> GetInstalledPrintersUnmanaged()
{
//siehe http://msdn.microsoft.com/en-us/library/dd162692(v=vs.85).aspx
uint cbNeeded = 0;
uint cReturned = 0;
if (PrinterMonitorInstallerPInvoke.EnumPrinters(PrinterMonitorInstallerPInvoke.PrinterEnumFlags.PRINTER_ENUM_LOCAL, null, 2, IntPtr.Zero, 0, ref cbNeeded, ref cReturned))
{
//succeeds, but shouldn't, because buffer is zero (too small)!
throw new Exception("EnumPrinters should fail!");
}
int lastWin32Error = Marshal.GetLastWin32Error();
//ERROR_INSUFFICIENT_BUFFER = 122 expected, if not -> Exception
if (lastWin32Error != 122)
{
throw new Win32Exception(lastWin32Error);
}
IntPtr pAddr = Marshal.AllocHGlobal((int)cbNeeded);
if (PrinterMonitorInstallerPInvoke.EnumPrinters(PrinterMonitorInstallerPInvoke.PrinterEnumFlags.PRINTER_ENUM_LOCAL, null, 2, pAddr, cbNeeded, ref cbNeeded, ref cReturned))
{
PrinterMonitorInstallerPInvoke.PRINTER_INFO_2[] printerInfo2 = new PrinterMonitorInstallerPInvoke.PRINTER_INFO_2[cReturned];
int offset = pAddr.ToInt32();
Type type = typeof(PrinterMonitorInstallerPInvoke.PRINTER_INFO_2);
int increment = Marshal.SizeOf(type);
for (int i = 0; i < cReturned; i++)
{
printerInfo2[i] = (PrinterMonitorInstallerPInvoke.PRINTER_INFO_2)Marshal.PtrToStructure(new IntPtr(offset), type);
offset += increment;
}
Marshal.FreeHGlobal(pAddr);
List <String> result = new List <string>();
for (int i = 0; i < cReturned; i++)
{
result.Add(printerInfo2[i].pPrinterName);
}
return(result);
}
throw new Win32Exception(Marshal.GetLastWin32Error());
}
