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xcvdata (winspool)
 
.
Summary
This allows you to communicate with a print monitor

C# Signature:

[DllImport("winspool.drv", SetLastError=true)]
static extern bool XcvData(IntPtr hXcv, [MarshalAs(UnmanagedType.LPWStr)] string pszDataName, IntPtr InputData, uint cbInputData,
              IntPtr OutputData, uint cbOutputData,out uint cbOutputNeeded,out uint dwStatus);

VB Signature:

Declare Function XcvData Lib "winspool.drv" (TODO) As TODO

User-Defined Types:

PRINTER_DEFAULTS

Notes:

None.

Sample Code:

     const  uint SERVER_ACCESS_ADMINISTER   = 0x00000001;

     string szIPAddress="";
     string xcvName = String.Format(",XcvPort {0}", portName);

     IntPtr buf= Marshal.AllocHGlobal(256);
     IntPtr hXcv = IntPtr.Zero;

     PRINTER_DEFAULTS Defaults = new PRINTER_DEFAULTS();
     Defaults.pDatatype = 0 ;
     Defaults.pDevMode = 0;
     Defaults.DesiredAccess = SERVER_ACCESS_ADMINISTER;

     // Handle to a local machine
     if (OpenPrinter(xcvName,out hXcv, ref Defaults ))
     {
        uint cbOutputNeeded;
        uint dwStatus;
        // hXvc contains an Xcv data handle to a local TCPMON port
        if (XcvData(hXcv, "IPAddress", IntPtr.Zero, 0, buf, 256, out cbOutputNeeded, out dwStatus))
        {
           szIPAddress= Marshal.PtrToStringAuto(buf);
           Console.Write(szRet);
        }

     }

     ClosePrinter(hXcv);

     if (buf != IntPtr.Zero)
        Marshal.FreeHGlobal(buf);

Documentation
XcvData on MSDN
Documentation

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