I'm sorry if this is a regular question, but I have found no answer
allthough I've been searching for an answer a long time now :)

I have declaration like this
[DllImport("winspool.drv",
EntryPoint="FindNextPrinterChangeNotification", SetLastError=true)]
public static extern int FindNextPrinterChangeNotification(int
hChange, out PRINTER_NOTIFY_OPTIONS pdwChange, IntPtr pvReserved, out
IntPtr ppPrinterNotifyInfo);

This is my function call
ManualResetEvent wh = (ManualResetEvent)state;
IntPtr ppPrinterNotifyInfo = IntPtr.Zero;
PRINTER_NOTIFY_OPTIONS notifyOptions;
notifyOptions.Count = 0;
notifyOptions.Flags = 1;//PRINTER_NOTIFY_OPTIONS_REFRESH
notifyOptions.Version = 2;
if ( FindNextPrinterChangeNotification(wh.Handle.ToInt32(),out
notifyOptions,IntPtr.Zero,out ptr ) != 0)

FindNextPrinterChangeNotification never returns 0, so that should
indicate it succeeds. My problems is that ppPrinterNotifyInfo doesn't
contain any data, and I can't figure out why.
Console.WriteLine(ppPrinterNotifyInfo.ToInt32()) allways prints '0' so
that should indicate that no data is allocated , right(?)

Please help me out(point me in a direction, whatever), I'm _very_
stuck :)
Thanks