C#利用广播实现群发功能

谁践踏了优雅 2022-09-18 15:58 232阅读 0赞

C\#利用广播实现群发功能

**\[csharp\]**  [view plain][] [copy][view plain]

1.  **using** System;  
2.  **using** System.Collections.Generic;  
3.  **using** System.ComponentModel;  
4.  **using** System.Data;  
5.  **using** System.Drawing;  
6.  **using** System.Text;  
7.  **using** System.Windows.Forms;  
8.  //添加的命名空间引用  
9.  **using** System.Net;  
10. **using** System.Net.Sockets;  
11. **using** System.Threading;  
12. **namespace** BroadcastExample  
13. \{  
14.     **public** partial **class** FormBroacast : Form  
15.     \{  
16.         **delegate** **void** AppendStringCallback(**string** text);  
17.         AppendStringCallback appendStringCallback;  
18.         //使用的接收端口号  
19.         **private** **int** port = 8001;  
20.         **private** UdpClient udpClient;  
21.         **public** FormBroacast()  
22.         \{  
23.             InitializeComponent();  
24.             appendStringCallback = **new** AppendStringCallback(AppendString);  
25.         \}  
26.   
27.         **private** **void** FormBroacast\_Load(**object** sender, EventArgs e)  
28.         \{  
29.             Thread myThread = **new** Thread(ReceiveData);  
30.             //将线程设为后台运行  
31.             myThread.IsBackground = **true**;  
32.             myThread.Start();  
33.         \}  
34.   
35.         
36.         /// <summary>  
37.         /// 在后台运行的接收线程  
38.         /// </summary>  
39.         **private** **void** ReceiveData()  
40.         \{  
41.             //在本机指定的端口接收  
42.             udpClient = **new** UdpClient(port);  
43.             IPEndPoint remote = **null**;  
44.             //接收从远程主机发送过来的信息；  
45.             **while** (**true**)  
46.             \{  
47.                 **try**  
48.                 \{  
49.                     //关闭udpClient时此句会产生异常  
50.                     **byte**\[\] bytes = udpClient.Receive(**ref** remote);  
51.                     **string** str = Encoding.UTF8.GetString(bytes, 0, bytes.Length);  
52.                     AppendString(**string**.Format("来自\{0\}：\{1\}", remote, str));  
53.                 \}  
54.                 **catch**  
55.                 \{  
56.                     //退出循环，结束线程  
57.                     **break**;  
58.                 \}  
59.             \}  
60.         \}  
61.   
62.         /// <summary>  
63.         /// 发送消息  
64.         /// </summary>  
65.         /// <param name="sender"></param>  
66.         /// <param name="e"></param>  
67.         **private** **void** buttonSend\_Click(**object** sender, EventArgs e)  
68.         \{  
69.             UdpClient myUdpClient = **new** UdpClient();  
70.             **try**  
71.             \{  
72.                 //让其自动提供子网中的IP广播地址  
73.                 IPEndPoint iep = **new** IPEndPoint(IPAddress.Broadcast, 8001);  
74.                 //将发送内容转换为字节数组  
75.                 **byte**\[\] bytes =Encoding.UTF8.GetBytes(textBox1.Text);  
76.                 //向子网发送信息  
77.                 myUdpClient.Send(bytes, bytes.Length, iep);  
78.                 textBox1.Clear();  
79.                 textBox1.Focus();  
80.             \}  
81.             **catch** (Exception err)  
82.             \{  
83.                 MessageBox.Show(err.Message, "发送失败");  
84.             \}  
85.             **finally**  
86.             \{  
87.                 myUdpClient.Close();  
88.             \}  
89.         \}  
90.          
91.         **private** **void** FormBroacast\_FormClosing(**object** sender, FormClosingEventArgs e)  
92.         \{  
93.             udpClient.Close();  
94.         \}  
95.   
96.         **private** **void** AppendString(**string** text)  
97.         \{  
98.             **if** (richTextBox1.InvokeRequired == **true**)  
99.             \{  
100.                 **this**.Invoke(appendStringCallback, text);  
101.             \}  
102.             **else**  
103.             \{  
104.                 richTextBox1.AppendText(text + "\\r\\n");  
105.             \}  
106.         \}  
107.     \}  
108. \}

界面设计：

![1346399281_1695.jpg][]

[view plain]: http://blog.csdn.net/huangwenhua5000/article/details/7929588#
[1346399281_1695.jpg]: https://img-my.csdn.net/uploads/201208/31/1346399281_1695.jpg