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C# 在本机命名管道和System.IO命名管道之间发送多条消息_C#_Named Pipes_.net_Native Methods - Fatal编程技术网

C# 在本机命名管道和System.IO命名管道之间发送多条消息

C# 在本机命名管道和System.IO命名管道之间发送多条消息,c#,named-pipes,.net,native-methods,C#,Named Pipes,.net,Native Methods,我需要在本机命名管道和System.IO命名管道之间发送多条消息。我从一体式代码框架(IPC和RPC)中获得了通信两端的代码 服务器: SafePipeHandle hNamedPipe = null; try { SECURITY_ATTRIBUTES sa = null; sa = CreateNativePipeSecurity(); // Create the named pipe. hNamedPipe = NativeMethod.CreateNamedPipe( Con

我需要在本机命名管道和System.IO命名管道之间发送多条消息。我从一体式代码框架(IPC和RPC)中获得了通信两端的代码

服务器:

SafePipeHandle hNamedPipe = null;

try { SECURITY_ATTRIBUTES sa = null;
sa = CreateNativePipeSecurity();

// Create the named pipe.
hNamedPipe = NativeMethod.CreateNamedPipe(
    Constants.FullPipeName,             // The unique pipe name.
    PipeOpenMode.PIPE_ACCESS_DUPLEX,    // The pipe is duplex
    PipeMode.PIPE_TYPE_MESSAGE |        // Message type pipe 
    PipeMode.PIPE_READMODE_MESSAGE |    // Message-read mode 
    PipeMode.PIPE_WAIT,                 // Blocking mode is on
    PIPE_UNLIMITED_INSTANCES,           // Max server instances
    1024,                 // Output buffer size
    1024,                 // Input buffer size
    NMPWAIT_USE_DEFAULT_WAIT,           // Time-out interval
    sa                                  // Pipe security attributes
);

if (hNamedPipe.IsInvalid)
{
    throw new Win32Exception();
}

Console.WriteLine("The named pipe ({0}) is created.", Constants.FullPipeName);

// Wait for the client to connect.
Console.WriteLine("Waiting for the client's connection...");
if (!NativeMethod.ConnectNamedPipe(hNamedPipe, IntPtr.Zero))
{
    if (Marshal.GetLastWin32Error() != ERROR_PIPE_CONNECTED)
    {
        throw new Win32Exception();
    }
}
Console.WriteLine("Client is connected.");

// 
// Receive a request from client.
// 

string message;
bool finishRead = false;
do
{
    byte[] bRequest = new byte[1024];
    int cbRequest = bRequest.Length, cbRead;

    finishRead = NativeMethod.ReadFile(
        hNamedPipe,             // Handle of the pipe
        bRequest,               // Buffer to receive data
        cbRequest,              // Size of buffer in bytes
        out cbRead,             // Number of bytes read 
        IntPtr.Zero             // Not overlapped 
        );

    if (!finishRead &&
        Marshal.GetLastWin32Error() != ERROR_MORE_DATA)
    {
        throw new Win32Exception();
    }

    // Unicode-encode the received byte array and trim all the 
    // '\0' characters at the end.
    message = Encoding.Unicode.GetString(bRequest).TrimEnd('\0');
    Console.WriteLine("Receive {0} bytes from client: \"{1}\"", cbRead, message);
}
while (!finishRead);  // Repeat loop if ERROR_MORE_DATA

// 
// Send a response from server to client.
// 

message = "Goodbye\0";
byte[] bResponse = Encoding.Unicode.GetBytes(message);
int cbResponse = bResponse.Length, cbWritten;

if (!NativeMethod.WriteFile(
    hNamedPipe,                 // Handle of the pipe
    bResponse,                  // Message to be written
    cbResponse,                 // Number of bytes to write
    out cbWritten,              // Number of bytes written
    IntPtr.Zero                 // Not overlapped
    ))
{
    throw new Win32Exception();
}

Console.WriteLine("Send {0} bytes to client: \"{1}\"",
    cbWritten, message.TrimEnd('\0'));

// Flush the pipe to allow the client to read the pipe's contents 
// before disconnecting. Then disconnect the client's connection.
NativeMethod.FlushFileBuffers(hNamedPipe);
NativeMethod.DisconnectNamedPipe(hNamedPipe); 
} 捕获(例外情况除外){ WriteLine(“服务器抛出错误:{0}”,例如Message); } 最后 { 如果(hNamedPipe!=null) { hNamedPipe.Close(); hNamedPipe=null; } }

客户:

            NamedPipeClientStream pipeClient = null;

        try
        {
            // Try to open the named pipe identified by the pipe name.

            pipeClient = new NamedPipeClientStream(
                ".",         // The server name
                Constants.PipeName,           // The unique pipe name
                PipeDirection.InOut,        // The pipe is duplex
                PipeOptions.None            // No additional parameters
            );

            pipeClient.Connect(5000);
            MessageBox.Show(
                string.Format( "The named pipe ({0}) is connected.", Constants.PipeName )
            );

            pipeClient.ReadMode = PipeTransmissionMode.Message;

            // 
            // Send a request from client to server
            // 

            for ( int i = 0; i < 2; i++ ) {

                string message = "hello my pipe dream\0";
                byte[] bRequest = Encoding.Unicode.GetBytes( message );
                int cbRequest = bRequest.Length;

                pipeClient.Write( bRequest, 0, cbRequest );

                MessageBox.Show(
                    string.Format( "Send {0} bytes to server: \"{1}\"", cbRequest, message.TrimEnd( '\0' ) )
                );
            }

            //
            // Receive a response from server.
            // 

            do
            {
                byte[] bResponse = new byte[1024];
                int cbResponse = bResponse.Length, cbRead;

                cbRead = pipeClient.Read(bResponse, 0, cbResponse);

                // Unicode-encode the received byte array and trim all the 
                // '\0' characters at the end.
                string message = Encoding.Unicode.GetString(bResponse).TrimEnd('\0');
                Console.WriteLine("Receive {0} bytes from server: \"{1}\"",
                    cbRead, message);
            }
            while (!pipeClient.IsMessageComplete);

        }
        catch (Exception ex)
        {
            new ErrorDialog( ex ).ShowDialog();
        }
        finally
        {
            // Close the pipe.
            if (pipeClient != null)
            {
                pipeClient.Close();
                pipeClient = null;
            }
        }
    }
NamedPipeClientStream pipeClient=null;
尝试
{
//尝试打开由管道名称标识的命名管道。
pipeClient=新名称PipeClientStream(
“,//服务器名称
Constants.PipeName,//唯一的管道名称
PipeDirection.InOut,//该管道是双工的
PipeOptions.None//无其他参数
);
pipeClient.Connect(5000);
MessageBox.Show(
Format(“已连接命名管道({0})”,Constants.PipeName)
);
pipeClient.ReadMode=PipeTransmissionMode.Message;
// 
//从客户端向服务器发送请求
// 
对于(int i=0;i<2;i++){
string message=“你好,我的白日梦\0”;
byte[]bRequest=Encoding.Unicode.GetBytes(消息);
int cbRequest=bRequest.Length;
pipeClient.Write(bRequest,0,cbRequest);
MessageBox.Show(
Format(“向服务器发送{0}字节:\“{1}\”,cbRequest,message.TrimEnd('\0'))
);
}
//
//从服务器接收响应。
// 
做
{
字节[]b响应=新字节[1024];
int cbResponse=b响应长度,cbRead;
cbRead=pipeClient.Read(breresponse,0,cbResponse);
//Unicode编码接收到的字节数组并修剪所有
//结尾有“\0”个字符。
字符串消息=Encoding.Unicode.GetString(breresponse.TrimEnd('\0');
WriteLine(“从服务器接收{0}字节:\“{1}\”,
cbRead,message);
}
而(!pipeClient.IsMessageComplete);
}
捕获(例外情况除外)
{
新建ErrorDialog(ex.ShowDialog();
}
最后
{
//把管子关上。
if(pipeClient!=null)
{
pipeClient.Close();
pipeClient=null;
}
}
}

正如您在上面的“从客户机向服务器发送请求”部分的for循环中所看到的,我正在尝试找出如何向服务器发送多条消息。我看到服务器代码循环执行,直到NativeMethod.ReadFile()方法返回true。我的问题是,在读取第一条消息后,它总是返回true,而忽略第二条消息,因此我的问题是,具体来说,我需要在客户端代码中执行哪些操作,以便此方法返回false,然后它将获得第二条消息。

客户端除了发送其所有“消息”之外,没有什么可以做的在一次写入管道中。这是因为,在消息模式下,消息由发送方的写调用完成来分隔,并且服务器代码只显式读取一条消息(在管道消息模式意义上)。见附件和文件:

数据将作为一个文件写入管道 消息流。烟斗处理 每次写入期间写入的字节数 作为消息单元的操作

如果正在读入命名管道 消息模式,下一条消息为 比nN字节存储区长 参数指定,ReadFile返回 FALSE和GetLastError返回 错误\u更多\u数据。剩余的 消息可由后续用户读取 调用ReadFile或 PeekNamedPipefunction

处理多条消息的可能方法有:

  • 定义一些更高级别的框架 客户端可以通过它来判断的协议 服务器需要读取多少条消息 在每个消息交换中。然后,客户端将发送一系列消息,例如[帧头:计数=3][message 1][message 2][message 3],或者[message 1][message 2][message 3][framing trailer:不再发送消息]
  • 一种多线程服务器,其中有 是一个持续的专用线程 从客户端读取消息, 其他操作,如书写 返回到正在处理的客户端的消息 在其他线程上完成
      谢谢你,克里斯,帮我看一下文档。我对你的答案投了赞成票,因为你引用的话让我找到了我想要的答案

      原来我只是被服务器代码的“从客户端接收请求”部分中的do/while循环弄糊涂了。也就是说,在我看来,它好像是在从客户端检索多条消息。但事实上,它是在检索单个消息的连续部分。我更新了代码部分如下

      // Receive a request from client.
      
      string message = string.Empty;
      bool finishRead = false;
      do
      {
          byte[] bRequest = new byte[1024];
          int cbRequest = bRequest.Length, cbRead;
      
          finishRead = NativeMethod.ReadFile(
              hNamedPipe,             // Handle of the pipe
              bRequest,               // Buffer to receive data
              cbRequest,              // Size of buffer in bytes
              out cbRead,             // Number of bytes read 
              IntPtr.Zero             // Not overlapped 
              );
      
          if (!finishRead &&
              Marshal.GetLastWin32Error() != ERROR_MORE_DATA)
          {
              throw new Win32Exception();
          }
      
          // Unicode-encode the received byte array and trim all the 
          // '\0' characters at the end.
          message += Encoding.Unicode.GetString(bRequest).TrimEnd('\0');
      }
      while (!finishRead);  // Repeat loop if ERROR_MORE_DATA
      
      Console.WriteLine( "Message received from client: \"{0}\"", message );
      
      至于在客户端对服务器的请求中划分多个“消息”,我可能只使用换行符