Question

我使用Windows7和VS2010编写一个C＃winform程序。在程序中，我运行启动TCP套接字服务器和套接字客户端。接受客户端套接字后，我将命令发送给客户端。当我发送数据时，发生错误：System.NullReferenceException.在此行：

 myClientSocket.Send(bs3, bs3.Length, 0);

我已经调试了程序，套接字服务器和客户端可以成功创建。客户端也可以成功连接到服务器。我认为myclientsocket可能不存在，因此无法发送命令。但是我不知道为什么。代码：

public partial class Form1 : Form
{
  public static Socket myClientSocket = null;
  protected override void OnLoad(EventArgs e)
  {
    SocketServie();
    Thread.Sleep(1000);
    runclient();
    Thread.Sleep(2000);
    read();
  }

  public void SocketServie()
  {

    string host = "127.0.0.1";
    int port = 8024;
    socket.SetSocketOption(SocketOptionLevel.Socket,
    SocketOptionName.ReuseAddress, true);     //port reuse
    socket.Bind(new IPEndPoint(IPAddress.Parse(host), port));
    socket.Listen(100);
    Thread SocketThread = new Thread(this.ListenClientConnect);
    SocketThread.IsBackground = true;
    SocketThread.Start();
  }


  private void ListenClientConnect()
  {

    while (true)
    {
      this.clientSocket = socket.Accept();
      Thread receiveThread = new Thread(new
      ParameterizedThreadStart(ReceiveMessage));

      receiveThread.IsBackground = true;

      receiveThread.Start(this);
      Thread.Sleep(1000);
    }
  }


  public void ReceiveMessage(object Form1)
  {
    Form2 f5 = new Form2();
    //Socket myClientSocket = (Socket)clientSocket;
    myClientSocket = (Socket)clientSocket;
    string InitCurMeter = "INIT_CUR_METER\r\n";
    byte[] bs = Encoding.UTF8.GetBytes(InitCurMeter);
    myClientSocket.Send(bs, bs.Length, 0);
    Thread.Sleep(2000);
    string InitVolMeter = "INIT_VOL_METER\r\n";
    byte[] bs2 =
     Encoding.UTF8.GetBytes(InitVolMeter);//Encoding.UTF8.GetBytes()
    myClientSocket.Send(bs2, bs2.Length, 0);
  }

  public void runclient(object sender, EventArgs e)
  {
    try
    {
      using (Process myProcess = new Process())
      {
        myProcess.StartInfo.UseShellExecute = false;
        myProcess.StartInfo.FileName = "socket_client.exe";
        myProcess.StartInfo.Arguments = "-p 8024";
        myProcess.StartInfo.CreateNoWindow = true;
        myProcess.Start();
      }
    }
    catch (Exception error)
    {

    }
  }

  public static void read()
  {

    try
    {
      string readCurMeter = "READ\r\n";
      byte[] bs3 = Encoding.UTF8.GetBytes(readCurMeter);
      myClientSocket.Send(bs3, bs3.Length, 0);
    }
    catch (Exception e5)
    {
      MessageBox.Show("read_cur error：" + e5.Message);

    }
  }
}

连接套接字客户端后，ClientSocket为空

0 个答案: