套接字编程 - 连接尝试失败异常

Question

我是新的套接字编程，并且正在创建一个聊天应用程序。与其他应用程序一样，每当我按下聊天窗口中的输入时，它都应该将聊天发送给特定用户。所有用户以及他们的IPAddresses.So每当我选择一个用户发送聊天，它应该发送到相应的IPAddress.As现在我试图发送聊天到我自己的机器（所以我硬编码我的机器IPAddress）。但是当我尝试将我的代码发送给我的IP地址时出现异常，可以请任何人帮助我。

我对套接字编程代码是这样

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 
using System.Net; 
using System.IO; 
using System.Net.Sockets; 

namespace Ping 
{ 
    class SocketProgramming 
    { 
     //Socket m_socWorker; 
     public AsyncCallback pfnWorkerCallBack; 
     public Socket m_socListener; 
     public Socket m_socWorker; 

     public void sendChat(IPAddress toMessengerIP) 
     { 
      try 
      { 
       //create a new client socket ... 

       m_socWorker = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.IP); 
       String szIPSelected = toMessengerIP.ToString(); 
       String szPort = "7777"; 
       int alPort = System.Convert.ToInt16(szPort, 10); 

       System.Net.IPAddress remoteIPAddress = System.Net.IPAddress.Parse(szIPSelected); 
       System.Net.IPEndPoint remoteEndPoint = new System.Net.IPEndPoint(remoteIPAddress, alPort); 
     //  receive(); 
       m_socWorker.Connect(remoteEndPoint); 

       //Send data 
       Object objData =(object)"hi dhivi"; 
       byte[] byData = System.Text.Encoding.ASCII.GetBytes(objData.ToString()); 
       m_socWorker.Send(byData); 


      } 
      catch (System.Net.Sockets.SocketException se) 
      { 
       //MessageBox.Show(se.Message); 
       Console.Out.Write(se.Message); 
      } 
     } 

     public void receive() 
     { 
      try 
      { 
       //create the listening socket... 
       m_socListener = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); 
       IPEndPoint ipLocal = new IPEndPoint(IPAddress.Any, 7777); 
       //bind to local IP Address... 
       m_socListener.Bind(ipLocal); 
       //start listening... 
       m_socListener.Listen(4); 
       // create the call back for any client connections... 
       m_socListener.BeginAccept(new AsyncCallback(OnClientConnect), null); 
       //cmdListen.Enabled = false; 

      } 
      catch (SocketException se) 
      { 
       Console.Out.Write(se.Message); 
      } 
     } 

     public void OnClientConnect(IAsyncResult asyn) 
     { 
      try 
      { 
       m_socWorker = m_socListener.EndAccept(asyn); 

       WaitForData(m_socWorker); 
      } 
      catch (ObjectDisposedException) 
      { 
       System.Diagnostics.Debugger.Log(0, "1", "\n OnClientConnection: Socket has been closed\n"); 
      } 
      catch (SocketException se) 
      { 
       Console.Out.Write(se.Message); 
      } 

     } 

     public class CSocketPacket 
     { 
      public System.Net.Sockets.Socket thisSocket; 
      public byte[] dataBuffer = new byte[1]; 
     } 

     public void WaitForData(System.Net.Sockets.Socket soc) 
     { 
      try 
      { 
       //if (pfnWorkerCallBack == null) 
       //{ 
       // pfnWorkerCallBack = new AsyncCallback(OnDataReceived); 
       //} 
       CSocketPacket theSocPkt = new CSocketPacket(); 
       theSocPkt.thisSocket = soc; 
       // now start to listen for any data... 
       soc.BeginReceive(theSocPkt.dataBuffer, 0, theSocPkt.dataBuffer.Length, SocketFlags.None, pfnWorkerCallBack, theSocPkt); 
      } 
      catch (SocketException se) 
      { 
       Console.Out.Write(se.Message); 
      } 

     } 
    } 
} 

每当用户点击确认按钮，应该调用sendChat（）方法。

私人无效txt_Userinput_KeyDown_1（对象发件人，发送KeyEventArgs E） {

Window parentWindow = Window.GetWindow(this); 
    TabItem tb = (TabItem)this.Parent; 
    string user = tb.Header.ToString(); 
    if (e.Key == Key.Return) 
    { 
     richtxtbox_chatwindow.AppendText(Environment.NewLine + user + " : " + txt_Userinput.Text); 
     DBCoding dbObject = new DBCoding(); 
     SocketProgramming socketObj = new SocketProgramming();     
     socketObj.sendChat(IPAddress.Parse("192.168.15.41"));    
    } 
    else { return; } 
} 

得到用户的ip地址

public IPAddress getIP() 
    { 
     String direction = ""; 
     WebRequest request = WebRequest.Create("http://checkip.dyndns.org/"); 
     using (WebResponse response = request.GetResponse()) 
     using (StreamReader stream = new StreamReader(response.GetResponseStream())) 
     { 
      direction = stream.ReadToEnd(); 
     } 

     //Search for the ip in the html 
     int first = direction.IndexOf("Address: ") + 9; 
     int last = direction.LastIndexOf("</body>"); 
     direction = direction.Substring(first, last - first); 
     IPAddress ip = IPAddress.Parse(direction); 
     return ip; 
    } 

Answer 1

你似乎从来没有被调用你receive方法。如果您的应用程序从未开始收听，则无人能够连接。如果您已经尝试过，并且发生异常，请发布该信息，然后我们将从此处开始。