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addmonitor (winspool)
 
.
Summary
The AddMonitor function installs a local port monitor and links the configuration, data, and monitor files.

C# Signature:

[DllImport("winspool.drv", SetLastError = true, CharSet = CharSet.Auto)]
private static extern Int32 AddMonitor(String pName, UInt32 Level, ref MONITOR_INFO_2 pMonitors);

VB Signature:

User-Defined Types:

MONITOR_INFO_2

Alternative Managed API:

Do you know one? Please contribute it!

Notes:

None.

Tips & Tricks:

Please add some!

Sample Code:

String sErrorTitle="Installing monitor";
String szMonitor="MyMonitor";

MONITOR_INFO_2 mi2 = new MONITOR_INFO_2();

mi2.pName = szMonitor;
mi2.pEnvironment = null;          
mi2.pDLLName = "mymon.dll";

try
{
    if (AddMonitor(null, 2, ref mi2) == 0)
    {
    string errorMessage = new Win32Exception(Marshal.GetLastWin32Error()).Message;
    MessageBox.Show(String.Format("Adding the monitor failed.\n\nError: {0}", errorMessage), sErrorTitle, MessageBoxButtons.OK, MessageBoxIcon.Error);

    return;
    }
}
catch (Exception e)
{
    MessageBox.Show(String.Format("Adding the monitor failed:\n\nException: {0}", e.ToString()), sErrorTitle, MessageBoxButtons.OK, MessageBoxIcon.Error);
}

Documentation
AddMonitor on MSDN

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