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32.4.2 TcpClient示例
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32.4.2 TcpClient示例
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<div style='float:left;width:49%'>·<a href='100165796.htm'>32.3 System.ServiceProcess命名空间</a></div><div style='float:right;width:49%'>·<a href='100165797.htm'>32.4 创建Windows服务</a></div><div style='float:left;width:49%'>·<a href='100165798.htm'>32.4.1 使用套接字的类库</a></div><div style='float:right;width:49%'>·<a href='100165800.htm'>32.4.3 Windows服务项目</a></div><div style='float:left;width:49%'>·<a href='100165801.htm'>32.4.4 线程和服务</a></div><div style='float:right;width:49%'>·<a href='100165802.htm'>32.4.5 服务的安装</a></div></div>
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<div id="text"> <link href="css.css" rel="stylesheet" type="text/css" /><h3 style='margin-top:8.15pt;margin-right:0cm;FTEL:8.15pt;margin-left:
0cm'><a FTEL="_Toc507815579"><span lang=EN-US>32.4.2 TcpClient</span></a><span
style='font-family:黑体'>示例</span></h3>
<p class=MsoNormal><span style='font-family:宋体'>客户端是一个简单的</span><span
lang=EN-US>Windows</span><span style='font-family:宋体'>应用程序，可以在此输入服务器的主机名和端口号。客户端应用程序使用</span><span
lang=EN-US>TcpClient</span><span style='font-family:宋体'>类连接正在运行的服务器，然后接收返回的消息，并显示在多行文本框中。窗体的底部还有一个状态栏，如图</span><span
lang=EN-US>32-5</span><span style='font-family:宋体'>所示。</span></p>
<p align=center><span lang=EN-US><img width=207 height=169
src="32/image005.jpg"></span></p>
<p align=center style='FTEL:8.15pt'><span style='font-family:宋体;color:black'>图</span><span
lang=EN-US style='color:black'> 32-5</span></p>
<p class=MsoBlockText style='margin-left:0cm;FTEL:21.25pt'><span
style='font-size:10.5pt;font-family:宋体;color:black;font-style:normal'>必须在代码中使用下面的</span><span
lang=EN-GB style='font-size:10.5pt;color:black;font-style:normal'>using</span><span
style='font-size:10.5pt;font-family:宋体;color:black;font-style:normal'>语句：</span></p>
<p class=2 style='margin-top:8.15pt;margin-right:0cm;FTEL:0cm;
margin-left:21.45pt;FTEL:.0001pt;FTEL:18.45pt'><span
lang=EN-US>using System;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>using
System.Drawing;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>using
System.Collections;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>using
System.ComponentModel;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>using
System.Windows.Forms;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>using
System.Data;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>using
System.Net;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>using
System.Net.Sockets;</span></p>
<p class=2 style='margin-top:0cm;margin-right:0cm;FTEL:8.15pt;
margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>using System.Text;</span></p>
<p class=MsoNormal><span style='font-family:宋体;color:black'>代码的其余部分由</span><span
lang=EN-US style='color:black'>IDE</span><span style='font-family:宋体;
color:black'>自动生成，在此就不详细讨论它们了。客户端的主要功能体现在</span><span lang=EN-US
style='color:black'>Get Quote</span><span style='font-family:宋体;color:black'>按钮的单击事件的处理程序中。</span></p>
<p class=2 style='margin-top:8.15pt;margin-right:0cm;FTEL:0cm;
margin-left:21.45pt;FTEL:.0001pt;FTEL:18.45pt'><span
lang=EN-US> protected void buttonQuote</span><span
lang=EN-US style='font-family:"Baskerville BE Regular"'>_</span><span
lang=EN-US>Click (object sender, System.EventArgs e) </span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:15.0pt'><span
lang=EN-US> {</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:15.0pt'><span
lang=EN-US> statusBar.Text =
"";</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:15.0pt'><span
lang=EN-US> string server =
textHostname.Text;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:15.0pt'><span
lang=EN-US> try</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:15.0pt'><span
lang=EN-US> {</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:15.0pt'><span
lang=EN-US>
int port = Convert.ToInt32(textPortNumber.Text);</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:15.0pt'><span
lang=EN-US> }</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:15.0pt'><span
lang=EN-US> catch
(FormatException ex)</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:15.0pt'><span
lang=EN-US> {</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:15.0pt'><span
lang=EN-US>
statusBar.Text = ex.Message;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:15.0pt'><span
lang=EN-US>
return;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:15.0pt'><span
lang=EN-US> }</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:15.0pt'><span
lang=EN-US> TcpClient client =
new TcpClient();</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:15.0pt'><span
lang=EN-US> try</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:15.0pt'><span
lang=EN-US> {</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:15.0pt'><span
lang=EN-US>
client.Connect(textHostname.Text,</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:15.0pt'><span
lang=EN-US>
Convert.ToInt32(textPortNumber.Text));</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:15.0pt'><span
lang=EN-US>
NetworkStream stream = client.GetStream();</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:15.0pt'><span
lang=EN-US>
byte[] buffer = new Byte[1024];</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:15.0pt'><span
lang=EN-US>
int received = stream.Read(buffer, 0, 1024);</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:15.0pt'><span
lang=EN-US>
if (received <= 0)</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:15.0pt'><span
lang=EN-US> {</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:15.0pt'><span
lang=EN-US>
statusBar.Text = "Read failed";</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:15.0pt'><span
lang=EN-US>
return;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:15.0pt'><span
lang=EN-US> }</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:15.0pt'><span
lang=EN-US> textQuote.Text
= Encoding.Unicode.GetString(buffer);</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:15.0pt'><span
lang=EN-US>
} </span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:15.0pt'><span
lang=EN-US> catch
(SocketException ex)</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:15.0pt'><span
lang=EN-US> {</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
statusBar.Text = ex.Message;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
}</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
finally</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
{</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
client.Close();</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
}</span></p>
<p class=2 style='margin-top:0cm;margin-right:0cm;FTEL:8.15pt;
margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
}</span></p>
<p class=MsoNormal><span style='font-family:宋体'>在打开测试服务器和这个</span><span
lang=EN-US>Windows</span><span style='font-family:宋体'>应用程序客户机之后，就可以对功能进行测试。如果运行成功，就可以得到如图</span><span
lang=EN-US>32-6</span><span style='font-family:宋体'>所示的结果。</span></p>
<p align=center><span lang=EN-US><img width=263 height=224
src="32/image006.jpg"></span></p>
<p align=center style='FTEL:8.15pt'><span style='font-family:宋体;color:black'>图</span><span
lang=EN-US style='color:black'> 32-6</span></p>
<p class=MsoNormal><span style='font-family:宋体'>现在继续向服务器中添加服务功能。程序已经在运行，还需要添加什么呢？通常，在系统启动时，不需要任何人登录系统，服务器程序就应该自动地打开，我们希望使用服务控制程序对此进行控制。</span></p>
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