异步客户端与表单交互

Question

我已经搜索了一天中最好的部分，试图弄清楚这一点，我确定我错过了某个简单的解决方案。

我正在使用异步套接字客户端连接来监视来自TCP连接的传入数据。我已经按照msdn示例的建议实施了ManualResetEvent和Callback方法，但Callback方法无法调用用于将接收到的数据输出到Windows窗体的方法。如何从套接字接收数据并将其发送到表单中的文本框？

我确定有一个简单的伎俩，我错过了某个地方。示例代码是为控制台应用程序编写的。我如何使表单对来自Socket的传入数据做出反应？

更新：

我觉得你让我走上正轨。我试着使用代码来使用代码，但我显然不太了解代表的工作方式，因为它一直抛出以下错误：

非静态字段，方法或属性' APRS_SMS_Gateway.MainForm.SockOutputDelegate'

你能让我靠近吗？这是ConnectCallBack处理程序，我现在正在尝试工作，但我想使用所有CallBack中的同一个方法（SockOutput）。

public partial class MainForm : Form 
{ 
    private AutoResetEvent receiveNow; 

    public delegate void SockOutputDelegatetype(string text); // Define delegate type 
    public SockOutputDelegatetype SockOutputDelegate; 

    // The port number for the remote device. 
    private const int port = 14580; 

    // ManualResetEvent instances signal completion. 
    private static ManualResetEvent connectDone = 
     new ManualResetEvent(false); 
    private static ManualResetEvent sendDone = 
     new ManualResetEvent(false); 
    private static ManualResetEvent receiveDone = 
     new ManualResetEvent(false); 

    // The response from the remote device. 
    private static String response = String.Empty; 

    public MainForm() 
    { 

     InitializeComponent(); 

     SockOutputDelegate = new SockOutputDelegatetype(SockOutput); 

    } 

    private void Form1_Load(object sender, EventArgs e) 
    { 
     CommSetting.APRSServer = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); 

     //StartClient(); 

    } 

    private void StartClient() 
    { 
     try 
     { 
      IPHostEntry ipHostInfo = Dns.GetHostEntry("rotate.aprs.net"); 
      IPAddress ipAddress = ipHostInfo.AddressList[0]; 
      IPEndPoint remoteEP = new IPEndPoint(ipAddress, port); 

      // Create a TCP/IP socket. 
      //Socket APRSServer = new Socket(AddressFamily.InterNetwork, 
      // SocketType.Stream, ProtocolType.Tcp); 

      // Connect to the remote endpoint. 
      CommSetting.APRSServer.BeginConnect(remoteEP, 
       new AsyncCallback(ConnectCallback), CommSetting.APRSServer); 
      connectDone.WaitOne(); 

      //Show the connect string from the host 
      Receive(CommSetting.APRSServer); 
      //receiveDone.WaitOne(); 

      //Show the connection response 
      //SockOutput(response); 
     } 
     catch (Exception e) 
     { 
      SockOutput(e.ToString()); 
     } 
    } 

    private static void ConnectCallback(IAsyncResult ar) 
    { 
     try 
     { 
      // Retrieve the socket from the state object. 
      Socket APRSServer = (Socket)ar.AsyncState; 

      // Complete the connection. 
      APRSServer.EndConnect(ar); 

      // Signal that the connection has been made. 
      connectDone.Set(); 
     } 
     catch (Exception e) 
     { 
      MainForm.Invoke(MainForm.SockOutputDelegate, e.ToString()); 
     } 
    } 

    private static void Receive(Socket client) 
    { 
     try 
     { 
      // Create the state object. 
      StateObject state = new StateObject(); 
      state.workSocket = client; 

      // Begin receiving the data from the remote device. 
      client.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0, 
       new AsyncCallback(ReceiveCallback), state); 
     } 
     catch (Exception e) 
     { 
      //throw new ApplicationException(e.ToString()); 
      response = e.ToString(); 
     } 
    } 

    private static void ReceiveCallback(IAsyncResult ar) 
    { 
     try 
     { 
      // Retrieve the state object and the client socket 
      // from the asynchronous state object. 
      StateObject state = (StateObject)ar.AsyncState; 
      Socket client = state.workSocket; 

      // Read data from the remote device. 
      int bytesRead = client.EndReceive(ar); 

      if (bytesRead > 0) 
      { 
       // There might be more data, so store the data received so far. 
       state.sb.Append(Encoding.ASCII.GetString(state.buffer, 0, bytesRead)); 

       // Get the rest of the data. 
       client.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0, 
        new AsyncCallback(ReceiveCallback), state); 
      } 
      else 
      { 
       // All the data has arrived; put it in response. 
       if (state.sb.Length > 1) 
       { 
        response = state.sb.ToString(); 
       } 
       // Signal that all bytes have been received. 
       receiveDone.Set(); 
      } 
     } 
     catch (Exception e) 
     { 
      response = e.ToString(); 
     } 
    } 


    void SockOutput(string text) 
    { 
      txtSockLog.AppendText(text); 
      txtSockLog.AppendText("\r\n"); 
    } 



} 

}

Answer 1

这听起来像你的插座一侧工作正常，它只是更新是造成问题的winform。你可以在这里找到你的答案Update WinForm Controls from another thread _and_ class。