how to convert FilterGetMessage function from c to c#

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I am trying to convert FilterGetMessage from c to c#. The client that I've developed in c is working fine but as I run this code after converting it in c# it is giving me an error output as : -2147023899 please help me out for this problem.

C#

[DllImport("FltLib", CallingConvention = CallingConvention.Winapi, CharSet = CharSet.Auto)]
           private static extern int <small>FilterGetMessage</small>(
                IntPtr hPort,
               IntPtr lpMessageBuffer,
               int dwMessageBufferSize,
               ref OVERLAPPED lpOverlapped);

C#

public struct OVERLAPPED {
    public UIntPtr Internal;
    public UIntPtr InternalHigh;

        public uint Offset;
        public uint OffsetHigh;
        public IntPtr Pointer;

    public IntPtr hEvent;
}
   OVERLAPPED povlp;
  povlp.Internal = UIntPtr.Zero;
             povlp.InternalHigh = UIntPtr.Zero;
             povlp.Offset = 0;
             povlp.OffsetHigh = 0;
             povlp.Pointer = IntPtr.Zero;
             povlp.hEvent = IntPtr.Zero;
             headerSize = Marshal.SizeOf(msg.MessageHeader);

                 msgsize += headerSize;
                 status = FilterGetMessage(
                     portPtr,
                     buf,
                     msgsize,
                     ref povlp);

C#

Posted 3-May-15 19:29pm

Member 11460356

Updated 3-May-15 19:30pm

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KarstenK · Answer 1 · 2015-05-03T20:33:00

Solution 1

Use CharSet = CharSet.Ansi to clarify what you are doing, but i wont be the solution. The FilterGetMessage documentation says that you need to provide a FILTER_MESSAGE_HEADER structure.

Consider writing the FilterGetMessage stuff completly in a C-dll. It could be easier and write a callback for resulting data.

Posted 3-May-15 20:33pm

KarstenK

Comments

Member 11460356 4-May-15 2:39am

Thanks for your reply can you please come up with a sample code??

Member 11460356 4-May-15 8:56am

I did tried using converting all stuff in dll and invoke that dll into c# program actually it won't work fine because we are dealing with a driver client and a frequent request of get and send message will be there so it will only be a good practice to include it in project by converting it