public NotifyInfo FindNextPrinterChangeNotification(bool refresh)
{
var ppPrinterNotifyInfo = IntPtr.Zero;
var pOptions = IntPtr.Zero;
var pPrinterNotifyInfo = IntPtr.Zero;
try
{
ppPrinterNotifyInfo = Marshal.AllocHGlobal(Marshal.SizeOf <IntPtr>());
PRINTER_NOTIFY_OPTIONS options = default;
options.Flags = refresh ? PRINTER_NOTIFY_OPTIONS_REFRESH : 0x00;
pOptions = Marshal.AllocHGlobal(Marshal.SizeOf <PRINTER_NOTIFY_OPTIONS>());
Marshal.StructureToPtr(options, pOptions, false);
if (!NativeMethods.FindNextPrinterChangeNotification(_changeHandle, out var change, pOptions, ppPrinterNotifyInfo))
{
throw new Win32Exception();
}
pPrinterNotifyInfo = Marshal.ReadIntPtr(ppPrinterNotifyInfo);
return(CreatePrinterNotifyInfo(change, pPrinterNotifyInfo));
}
finally
{
Marshal.FreeHGlobal(pOptions);
Marshal.FreeHGlobal(ppPrinterNotifyInfo);
if (pPrinterNotifyInfo != IntPtr.Zero)
{
NativeMethods.FreePrinterNotifyInfo(pPrinterNotifyInfo);
}
}
}
internal static extern bool FindNextPrinterChangeNotification
([In] IntPtr hChangeObject,
[Out] out int pdwChange,
[In, MarshalAs(UnmanagedType.LPStruct)] PRINTER_NOTIFY_OPTIONS pPrinterNotifyOptions,
[Out] out IntPtr lppPrinterNotifyInfo
);
internal static extern IntPtr FindFirstPrinterChangeNotification
([In] IntPtr hPrinter,
[In] int fwFlags,
[In] int fwOptions,
[In, MarshalAs(UnmanagedType.LPStruct)] PRINTER_NOTIFY_OPTIONS pPrinterNotifyOptions);
public static extern bool FindNextPrinterChangeNotification
([InAttribute()] IntPtr hChangeObject,
[OutAttribute()] out Int32 pdwChange,
[InAttribute(), MarshalAs(UnmanagedType.LPStruct)] PRINTER_NOTIFY_OPTIONS pPrinterNotifyOptions,
[OutAttribute()] out IntPtr lppPrinterNotifyInfo
);
public static extern IntPtr FindFirstPrinterChangeNotification
([InAttribute()] IntPtr hPrinter,
[InAttribute()] Int32 fwFlags,
[InAttribute()] Int32 fwOptions,
[InAttribute(), MarshalAs(UnmanagedType.LPStruct)] PRINTER_NOTIFY_OPTIONS pPrinterNotifyOptions);
public static extern bool FindNextPrinterChangeNotification([In] IntPtr hChange,
[Out] out int pdwChange,
[In] PRINTER_NOTIFY_OPTIONS
pPrinterNotifyOptions,
ref IntPtr ppPrinterNotifyInfo);
