1

伙计们很难弄清楚这一点：我正在尝试测试用于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（在这种情况下是主机名）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());
    }

}

对于代码的接收，我有一个只有一个列表框（listBox1）的表单。这里的问题是，当我执行要接收的代码时，程序运行但表单不可见。但是，当我评论函数调用（ startUdpListener1() ）时，没有达到目的，但表单是可见的。怎么了？

4

1 回答 1

1

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

于 2009-05-15T17:34:44.660 回答