Question

伙计们在解决这个问题时遇到了一些困难：我试图测试广播消息和接收消息的代码（在c＃中）是否有效：

发送数据报的代码（在本例中是主机名）是：

public partial class Form1 : Form
{
    String hostName;
    byte[] hostBuffer = new byte[1024];
    public Form1()
    {
        InitializeComponent();
        StartNotification();
    }
    public void StartNotification()
    {

        IPEndPoint notifyIP = new IPEndPoint(IPAddress.Broadcast, 6000);

        hostName = Dns.GetHostName();
        hostBuffer = Encoding.ASCII.GetBytes(hostName);

        UdpClient newUdpClient = new UdpClient();
        newUdpClient.Send(hostBuffer, hostBuffer.Length, notifyIP);


    }
}

接收数据报的代码是：

 public partial class Form1 : Form
{
    byte[] receivedNotification = new byte[1024];
    String notificationReceived;
    StringBuilder listBox;

    UdpClient udpServer;
    IPEndPoint remoteEndPoint;

    public Form1()
    {
        InitializeComponent();
        udpServer = new UdpClient(new IPEndPoint(IPAddress.Any, 1234));
        remoteEndPoint=null;

        startUdpListener1();

    }

    public void startUdpListener1()
    {
        receivedNotification = udpServer.Receive(ref remoteEndPoint);
        notificationReceived = Encoding.ASCII.GetString(receivedNotification);

        listBox = new StringBuilder(this.listBox1.Text);
        listBox.AppendLine(notificationReceived);

        this.listBox1.Items.Add(listBox.ToString());
    }

}

为了接收代码我有一个只有一个列表框（listBox1）的表单。这里的问题是当我执行接收代码时，程序运行但表单不可见。但是，当我注释函数调用（startUdpListener1（））时，目的不是服务但表单是可见的。怎么回事？

Answer 1

udpServer.Receive（）可能是一个阻塞调用，等待数据（它没有得到）

测试广播和接收消息

1 个答案: