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16.4.3 简单的客户机
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16.4.3 简单的客户机
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<div style='float:left;width:49%'>·<a href='100165466.htm'>16.4 远程对象、客户机和服务器</a></div><div style='float:right;width:49%'>·<a href='100165467.htm'>16.4.1 远程对象</a></div><div style='float:left;width:49%'>·<a href='100165468.htm'>16.4.2 简单的服务器</a></div><div style='float:right;width:49%'>·<a href='100165470.htm'>16.5 .NET Remoting体系结构</a></div><div style='float:left;width:49%'>·<a href='100165471.htm'>16.5.1 信道</a></div><div style='float:right;width:49%'>·<a href='100165472.htm'>16.5.2 格式标识符</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-LEFT: 0cm; MARGIN-RIGHT: 0cm; FTEL: 8.15pt"><a ftel="_Toc507815553"><span lang="EN-US">16.4.3 </span></a><span style="FONT-FAMILY: 黑体">简单的客户</span><span style="FONT-FAMILY: 黑体">机</span></h3>
<p class="MsoNormal"><span style="COLOR: black; FONT-FAMILY: 宋体">这个客户机也是一个</span><span lang="EN-US" style="COLOR: black">C#</span><span style="COLOR: black; FONT-FAMILY: 宋体">控制台应用程序</span><span lang="EN-US" style="COLOR: black">HelloClient</span><span style="COLOR: black; FONT-FAMILY: 宋体">。这里也引用了</span><span lang="EN-US" style="COLOR: black">System.Runtime. Remoting</span><span style="COLOR: black; FONT-FAMILY: 宋体">程序集，以便使用</span><span lang="EN-US" style="COLOR: black">TcpClientChannel</span><span style="COLOR: black; FONT-FAMILY: 宋体">类。此外，也必须引用</span><span lang="EN-US" style="COLOR: black">RemoteHello</span><span style="COLOR: black; FONT-FAMILY: 宋体">程序集。我们将在远程服务器上创建对象，但是为了代理对象能在运行期间读取元数据，还需要在客户机上引用程序集。</span></p>
<p class="MsoNormal"><span style="COLOR: black; FONT-FAMILY: 宋体; LETTER-SPACING: -0.2pt">在客户机程序中，要创建一个</span><span lang="EN-US" style="COLOR: black; LETTER-SPACING: -0.2pt">TcpClientChannel</span><span style="COLOR: black; FONT-FAMILY: 宋体; LETTER-SPACING: -0.2pt">对象，这个对象在</span><span lang="EN-US" style="COLOR: black; LETTER-SPACING: -0.2pt">ChannelServices</span><span style="COLOR: black; FONT-FAMILY: 宋体; LETTER-SPACING: -0.2pt">中注册。对于</span><span lang="EN-US" style="COLOR: black; LETTER-SPACING: -0.2pt">TcpChannel</span><span style="COLOR: black; FONT-FAMILY: 宋体; LETTER-SPACING: -0.2pt">，使用默认的构造函数，因此可以选择任意一个端口。接下来使用</span><span lang="EN-US" style="COLOR: black; LETTER-SPACING: -0.2pt">Activator</span><span style="COLOR: black; FONT-FAMILY: 宋体; LETTER-SPACING: -0.2pt">类把代理对象返回给远程对象。</span><span style="COLOR: black; FONT-FAMILY: 宋体">这个对象看起来像是真实对象，原因是它提供了相同的方法。透明代理对象使用真实代理对象把消息发送给信道：</span></p>
<p class="2" style="MARGIN-TOP: 8.15pt; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><a ftel="OLE_LINK3"><span lang="EN-US">using System;</span></a></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US">using System.Runtime.Remoting.Channels;</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US">using System.Runtime.Remoting.Channels.Tcp;</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US"> </span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US">namespace Wrox.ProCSharp.Remoting</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US">{</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US"> </span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US"> public class HelloClient</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US"> {</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US"> public static void Main(string[] args)</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US"> {</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US"> ChannelServices.RegisterChannel(new TcpClientChannel());</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US"> Hello obj = (Hello)Activator.GetObject(</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US"> typeof(Hello), "tcp://localhost:8086/Hi");</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US"> if (obj == null)</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US"> {</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US"> Console.WriteLine("could not locate server");</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US"> return;</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US"> }</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US"> for (int i=0; i< 5; i++)</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US"> {</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US"> Console.WriteLine(obj.Greeting("Christian"));</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US"> }</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US"> }</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US"> }</span></p>
<p class="2" style="MARGIN-TOP: 0cm; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><span lang="EN-US">}</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">当打开服务器和客户机程序</span><span lang="EN-US">Hello</span><span style="FONT-FAMILY: 宋体">时，</span><span lang="EN-US">Christian</span><span style="FONT-FAMILY: 宋体">在客户机控制台中会出现</span><span lang="EN-US">5</span><span style="FONT-FAMILY: 宋体">次。在服务器应用程序的控制台窗口中，会看到类似图</span><span lang="EN-US">16-4</span><span style="FONT-FAMILY: 宋体">所示的窗口输出结果。可以看出，因为选择的是</span><span lang="EN-US">WellKnownObject Mode.SingleCall</span><span style="FONT-FAMILY: 宋体">激活模式，所以为每一个方法调用都要创建一个新的实例。根据所需的时间和资源，也可能会调用一些析构函数。例如，如果多次启动客户机，则一定可以看到一些析构函数的调用。</span></p>
<p style="MARGIN-TOP: 4.9pt" align="center"><span lang="EN-US"><img height="128" src="16/image004.jpg" width="166" alt="" /></span></p>
<p style="MARGIN-TOP: 3.25pt; MARGIN-LEFT: 0cm; MARGIN-RIGHT: 0cm; FTEL: 8.15pt" align="center"><span style="FONT-FAMILY: 宋体">图</span><span lang="EN-US"> 16-4</span></p></div>
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<div style='float:left;width:49%'>·<a href='100165466.htm'>16.4 远程对象、客户机和服务器</a></div><div style='float:right;width:49%'>·<a href='100165467.htm'>16.4.1 远程对象</a></div><div style='float:left;width:49%'>·<a href='100165468.htm'>16.4.2 简单的服务器</a></div><div style='float:right;width:49%'>·<a href='100165470.htm'>16.5 .NET Remoting体系结构</a></div><div style='float:left;width:49%'>·<a href='100165471.htm'>16.5.1 信道</a></div><div style='float:right;width:49%'>·<a href='100165472.htm'>16.5.2 格式标识符</a></div></div>
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