如何将FilterGetMessage函数从c转换为c＃ [英] how to convert FilterGetMessage function from c to c#

问题描述

我正在尝试将FilterGetMessage从c转换为c＃。我在c中开发的客户端工作正常，但是当我在c＃中转换后运行此代码时，它给出了一个错误输出：-2147023899请帮我解决这个问题。

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.

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

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);

推荐答案

使用CharSet = CharSet.Ansi来澄清你在做什么，但我不会成为解决方案。 FilterGetMessage 文档说你需要提供一个FILTER_MESSAGE_HEADER结构。



考虑在C-dll中完全编写FilterGetMessage。它可以更容易并为结果数据写回调。

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.

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