How do I retrieve the return value from a out IntPtr type of variable?

Hi, I'm calling C++ function from a C# windows application.  The DllImport declaration is at
http://www.pinvoke.net/default.aspx/ntdsapi/DsCrackNames.html

ONe of the function is decared as:
[DllImport("ntdsapi.dll", CharSet=CharSet.Auto, SetLastError = false)]
static public extern uint DsCrackNames(
      IntPtr hDS,
      DS_NAME_FLAGS flags,
      DS_NAME_FORMAT formatOffered,
      DS_NAME_FORMAT formatDesired,
      uint cNames,
    [MarshalAs(UnmanagedType.LPArray, ArraySubType = UnmanagedType.LPWStr, SizeParamIndex = 4)]
        string[] rpNames,      
      string[] rpNames,
      out IntPtr ppResult  // PDS_NAME_RESULT
      );

1.  How do I get the result returned in ppResult?
2.  I tried testing calling this funciton and assign the function result to a unit variable but am not able to read its value in Debug.  How can I tell if the function returns No_Error?
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