Tcp / IP实例使端口忙 [英] Tcp/IP instance keeps port busy

问题描述

大家好，



我有一个应用程序，我试图通过以太网与硬件进行通信。我的应用程序有2个按钮，一个用于连接和另外发送命令。



连接按钮点击事件如下所示：

Hi All,

I have an application through which i am trying to communicate with the hardware via ethernet. My application has 2 buttons, one to connect & other to send commands.

Connect button click event is as shown below:

private void btnConnect_Click(object sender, EventArgs e)
      {
              client = new TcpClient();
              client.SendTimeout = SEND_TIMEOUT;
              client.ReceiveTimeout = RESPONSE_TIMEOUT;
              client.Connect(DeviceIPAddress, DevicePortNumber);
              if (!client.Connected)
               {
                 throw new Exception("Device not connected");
               }
      }

 private void btnSendCmd_Click(object sender, EventArgs e)
      {
        using (client = new TcpClient(DeviceIPAddress, DevicePortNumber))
          {
          client.SendTimeout = SEND_TIMEOUT;
          client.ReceiveTimeout = RESPONSE_TIMEOUT;
          string commandResponse = null;
          byte[] sendDataBuffer;
          byte[] receiveDataBuffer = new byte[1024];

          // other process takes places here
          }
        }

问题是每当我点击在连接按钮上，创建了TCP实例&港口一直很忙。连接后，如果我尝试单击SendCommand按钮，则会抛出错误，说无法通信。



非常感谢任何形式的帮助。



提前致谢，

Jagadisha。 N $ / $


我尝试了什么：



我试过评论下面的内容连接按钮点击事件中的代码行，但问题仍然相同。

The problem is whenever i click on connect button, the TCP instance is created & the port is kept busy. And after connecting, if i try to click on SendCommand button it throws error saying unable to communicate.

Any kind of help is really appreciated.

Thanks in advance,
Jagadisha. N

What I have tried:

I tried commenting the below lines of code in connect button click event, but the issue remains the same.

 //client.SendTimeout = SEND_TIMEOUT;
//client.ReceiveTimeout = RESPONSE_TIMEOUT;

推荐答案

您的连接按钮创建客户端并连接到设备。您的发送按钮然后创建一个新客户端，不使用该客户端连接，然后尝试发送数据。



您需要从连接中重新使用客户端您的发送代码中的代码，因此删除using（client =行，当代码引用client时，它将引用您在连接代码中创建的客户端。

Your connect button create a client and connects to the device. Your send button then creates a new client, doesn't connect using that client, then tries to send data.

You need to re-use the client from your connect code in your send code, so remove the "using (client =" line and when the code references "client" it'll reference the client you created in the connect code.

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