C# Signature:

    [DllImport("ole32.dll")]
    static extern int CoQueryClientBlanket(out IntPtr pAuthnSvc, out IntPtr pAuthzSvc,
        [MarshalAs(UnmanagedType.LPWStr)] out StringBuilder pServerPrincName, out IntPtr
        pAuthnLevel, out IntPtr pImpLevel, out IntPtr pPrivs, out IntPtr pCapabilities);

User-Defined Types:

None.

Notes:

The original version of this errored with a message about memory corruption.

My modification works without error, if you use the code sample you'll need to plug in your own logging.

Tips & Tricks:

Please add some!

Sample Code:

{

    System.IntPtr pAthnSvc = new IntPtr();
    System.IntPtr pAthzSvc = new IntPtr();
    StringBuilder pServerPrincName = new StringBuilder();
    System.IntPtr pAuthnLevel = new IntPtr();
    System.IntPtr pImpLevel = new IntPtr();
    System.IntPtr pPrivs = new IntPtr();
    System.IntPtr pCaps = new IntPtr(4);

    try
    {
        trc.Log(LOG_DEBUG, "Retrieving Principle Name");            
        CoQueryClientBlanket(out pAthnSvc, out pAthzSvc, out pServerPrincName, out pAuthnLevel, out pImpLevel, out pPrivs, out pCaps);

        trc.Log(LOG_DEBUG, "Called CoQueryClientBlanket without error");
    }
    catch(Exception ex)
    {
        // Something went wrong, report it and then check if
        //we have a valid token attached instead
        trc.LogError( ex.Message ) ;
    }
    finally
    {
        // Logging the values to aid any debugging that may be required
        trc.Log( LOG_DEBUG, "Values");
        trc.Log( LOG_DEBUG, "pAthnSvc = " + pAthnSvc);
        trc.Log( LOG_DEBUG, "pAthzSvc = " + pAthzSvc);
        trc.Log( LOG_DEBUG, "pAuthnLevel = " + pAuthnLevel);
        trc.Log( LOG_DEBUG, "pImpLevel = " + pImpLevel);
        trc.Log( LOG_DEBUG, "pPrivs = " + pPrivs);
        trc.Log( LOG_DEBUG, "pCaps = " + pCaps);
        trc.Log( LOG_DEBUG, "pServerPrincName = " + pServerPrincName);
    }

}

Alternative Managed API:

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