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POVirtual printer port monitor installing
 

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    <p>I have a port monitor dll, that I instaling by call AddMonitor function of the spooler. But when I want uninstal this monitor, the DeleteMonitor function return errorcode 3008 - "The specified print monitor is currently in use". How I can free my monitor dll?</p> <pre><code> [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)] private class MONITOR_INFO_2 { [MarshalAs(UnmanagedType.LPStr)] public string pName; [MarshalAs(UnmanagedType.LPStr)] public string pEnvironment; [MarshalAs(UnmanagedType.LPStr)] public string pDLLName; } [DllImport("winspool.Drv", EntryPoint = "AddMonitorA", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)] private static extern bool AddMonitor( [MarshalAs(UnmanagedType.LPStr)] string Name, Int32 Level, [In, MarshalAs(UnmanagedType.LPStruct)] MONITOR_INFO_2 mi2); [DllImport("winspool.Drv", EntryPoint = "DeleteMonitorA", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)] private static extern bool DeleteMonitor( [MarshalAs(UnmanagedType.LPStr)] string pNullServerName, [MarshalAs(UnmanagedType.LPStr)] string pNullEnvironment, [MarshalAs(UnmanagedType.LPStr)] string MonitorName); private unsafe void InstallMonitor(string monitorName, string dllName) { MONITOR_INFO_2 mi2 = new MONITOR_INFO_2(); mi2.pName = monitorName; mi2.pEnvironment = null; mi2.pDLLName = dllName; try { bool bRet = AddMonitor(null, 2, mi2); if (!bRet) throw new Win32Exception(Marshal.GetLastWin32Error()); } catch (Exception e) { if (!DeleteMonitor(null, null, monitorName)) { throw new Win32Exception(Marshal.GetLastWin32Error()); } bRet = AddMonitor(null, 2, mi2); if (!bRet) throw new Win32Exception(Marshal.GetLastWin32Error()); } } </code></pre>
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