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28.3.4 添加连接点
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28.3.4 添加连接点
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2006-10-13 14:41:00
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<div style='float:left;width:49%'>·<a href='100165722.htm'>28.3.1 创建COM组件</a></div><div style='float:right;width:49%'>·<a href='100165723.htm'>28.3.2 创建Runtime Callable Wrapper</a></div><div style='float:left;width:49%'>·<a href='100165724.htm'>28.3.3 线程问题</a></div><div style='float:right;width:49%'>·<a href='100165726.htm'>28.3.5 在Windows窗体中使用ActiveX控件</a></div><div style='float:left;width:49%'>·<a href='100165727.htm'>28.3.6 在ASP.NET中使用COM对象</a></div><div style='float:right;width:49%'>·<a href='100165728.htm'>28.4 在COM客户程序中使用.NET组件</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'><span lang=EN-US>28.3.4 </span><span style='font-family:黑体'>添加连接点</span></h3>
<p class=MsoNormal><span style='font-family:宋体'>为了理解</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>事件在</span><span lang=EN-US>.NET</span><span
style='font-family:宋体'>应用程序中的处理方式，首先必须扩展</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>组件。使用特性在</span><span lang=EN-US>ATL</span><span
style='font-family:宋体'>类中执行</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>事件类似于执行</span><span lang=EN-US>.NET</span><span
style='font-family:宋体'>中的事件，但功能不同。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>首先必须在头文件</span><span
lang=EN-US>COMDemo.h</span><span style='font-family:宋体'>中添加另一个接口。接口</span><span
lang=EN-US>ICompletesEvents</span><span style='font-family:宋体'>由客户程序</span><span
lang=EN-US>(.NET</span><span style='font-family:宋体'>应用程序</span><span
lang=EN-US>)</span><span style='font-family:宋体'>实现，由组件调用。在本例中，在完成了计算后，方法</span><span
lang=EN-US>Completes()</span><span style='font-family:宋体'>由组件调用。这个接口也称为输出接口。输出接口必须是分派接口或定制接口。所有的客户程序都支持分派接口。</span><span
lang=EN-US>id</span><span style='font-family:宋体'>为</span><span lang=EN-US>0F21F359-AB84-41e8-9A78-36D110E6D2F9</span><span
style='font-family:宋体'>的定制接口定义了在</span><span lang=EN-US>RCW</span><span
style='font-family:宋体'>中创建的接口名。</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>//_ICompletedEvents</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>
dispinterface,</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
uuid("B2CBBCD3-2993-4148-8EF4-356EACFD834B"),</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
custom(0F21F359-AB84-41e8-9A78-36D110E6D2F9,</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
"Wrox.ProCSharp.COMInterop.Server.ICompletesEvents"),</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
helpstring("_ICompletedEvents Interface")</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>__interface
_ICompletedEvents</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>
[id(1)] void Completed(void);</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'>把特性</span><span lang=EN-US>event_source("com")</span><span
style='font-family:宋体'>应用于类</span><span lang=EN-US>CCOMDemo</span><span
style='font-family:宋体'>，会创建一个连接点对象，把</span><span lang=EN-US>__event</span><span
style='font-family:宋体'>关键字添加到这个类的公共部分，如下面的代码所示。这个关键字为所定义接口的所有引发事件的方法创建了一个帮助类，事件用方法</span><span
lang=EN-US>FireCompleted()</span><span style='font-family:宋体'>中的关键字</span><span
lang=EN-US>__raise</span><span style='font-family:宋体'>引发。</span></p>
<p class=a5 style='margin-top:8.15pt;margin-right:0cm;FTEL:0cm;
margin-left:21.45pt;FTEL:.0001pt;FTEL:18.45pt'><span
lang=EN-US>[</span></p>
<p class=a5 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
coclass,</span></p>
<p class=a5 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
threading(" apartment"),</span></p>
<p class=a5 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
vi_progid("COMServer.COMDemo"),</span></p>
<p class=a5 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
progid("COMServer.COMDemo,1"),</span></p>
<p class=a5 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
version(1.0),</span></p>
<p class=a5 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
custom(0F21F359-AB84-41e8-9A78-36D110E6D2F9,</span></p>
<p class=a5 style='margin-left:21.45pt;FTEL:27.65pt'><span lang=EN-US>
"Wrox.ProCSharp.COMInterop.Server.COMDemo")</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:27.65pt'><span lang=EN-US>event_source("com")</span></p>
<p class=a5 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
helpstring("COMDemo Class")</span></p>
<p class=a5 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>]</span></p>
<p class=a5 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>class
ATL_NO_VTABLE CCOMDemo :</span></p>
<p class=a5 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
public IWelcome, public IMath</span></p>
<p class=a5 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>{</span></p>
<p class=a5 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>public:</span></p>
<p class=a5 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
CCOMDemo()</span></p>
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