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28.4.7 添加连接点
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28.4.7 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='100165732.htm'>28.4.4 COM互操作特性</a></div><div style='float:right;width:49%'>·<a href='100165733.htm'>28.4.5 COM注册</a></div><div style='float:left;width:49%'>·<a href='100165734.htm'>28.4.6 创建COM客户程序</a></div><div style='float:right;width:49%'>·<a href='100165736.htm'>28.4.8 用sink对象创建客户</a></div><div style='float:left;width:49%'>·<a href='100165737.htm'>28.4.9 在Internet Explorer中运行Windows窗体控件</a></div><div style='float:right;width:49%'>·<a href='100165738.htm'>28.5 小结</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>28.4.7 </span><span style='font-family:黑体'>添加连接点</span></h3>
<p class=MsoNormal><span style='font-family:宋体'>在</span><span lang=EN-US>.NET</span><span
style='font-family:宋体'>组件中添加对</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>事件的支持，需要对</span><span lang=EN-US>.NET</span><span
style='font-family:宋体'>类的实现作一些修改。提供</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>事件并不是简单地使用</span><span lang=EN-US>event</span><span
style='font-family:宋体'>和</span><span lang=EN-US>delegate</span><span
style='font-family:宋体'>关键字，还需要添加更多的</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>互操作特性。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>首先需要给</span><span lang=EN-US>.NET</span><span
style='font-family:宋体'>项目添加另一个接口</span><span lang=EN-US>IMathEvents</span><span
style='font-family:宋体'>。这个接口是组件的源或输出接口，由客户中的</span><span lang=EN-US>sink</span><span
style='font-family:宋体'>对象执行。源接口必须是分派接口或定制接口。脚本客户程序只支持分派接口。分派接口通常优先于源接口。</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>[InterfaceType(ComInterfaceType. InterfaceIsIDispatch)]</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>public
interface IMathEvents</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>
[DispId(46200)] void CalculationCompleted();</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'>接着，添加一个委托。委托必须与输出接口中的方法有相同的签名和返回类型。如果源接口中有多个方法，每个方法的参数都有所不同，就必须为每个方法都指定一个委托。因为</span><span
lang=EN-US>COM</span><span style='font-family:宋体'>客户不需要直接访问这个委托，所以委托可以用特性</span><span
lang=EN-US>[ComVisible(false)]</span><span style='font-family:宋体'>标记：</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>[ComVisible(false)]</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>public delegate void
CalculationCompletedDelegate();</span></p>
<p class=MsoNormal><span style='font-family:宋体'>在类</span><span lang=EN-US>DotNetComponent</span><span
style='font-family:宋体'>中，必须指定源接口。这可以使用特性</span><span lang=EN-US>[ComSourceInterfaces]</span><span
style='font-family:宋体'>来实现。添加特性</span><span lang=EN-US>[ComSourceInterface]</span><span
style='font-family:宋体'>，像前面那样指定输出接口。可以用特性类的不同构造函数添加多个接口，但是支持多个源接口的惟一客户语言是</span><span
lang=EN-US>C++</span><span style='font-family:宋体'>。</span><span lang=EN-US>VB6</span><span
style='font-family:宋体'>客户程序仅支持一个源接口。</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> [ClassInterface(ClassInterfaceType.None)]</span></p>
<p class=a5 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
[ProgId("Wrox. DotnetComponent")]</span></p>
<p class=a5 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
[Guid("77839717-40DD-8297-35B98A8402C7")]</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:27.65pt'><span lang=EN-US>[ComSourceInterfaces(typeof(IMathevents))</span></p>
<p class=a5 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
public class DotnetComponent : IWelcome, 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 DotnetComponent()</span></p>
<p class=a5 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
{</span></p>
<p class=a5 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'>在类</span><span lang=EN-US>DotNetComponent</span><span
style='font-family:宋体'>中，必须为源接口的每个方法声明一个事件。方法的类型必须是委托名，事件名必须是源接口中的方法名。可以给</span><span
lang=EN-US>Add()</span><span style='font-family:宋体'>方法和</span><span lang=EN-US>Sub()</span><span
style='font-family:宋体'>方法添加事件调用。这一步是调用事件的正常</span><span lang=EN-US>.NET</span><span
style='font-family:宋体'>方式，详见第</span><span lang=EN-US>6</span><span
style='font-family:宋体'>章。</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> public event CalculationCompletedDelegate CalculationCompleted
;</span></p>
<p class=a5 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
public int Add(int val1, int val2)</span></p>
<p class=a5 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>
int result = val1 + val2;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
if (CalculationCompleted != null)</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
CalculationCompleted();</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
return result;</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> </span></p>
<p class=a5 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
public int Sub(int val1, int val2)</span></p>
<p class=a5 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>
int result = val1 - val2;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
if (CalculationCompleted != null)</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
CalculationCompleted();</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
return result;</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>
}</span></p>
<p class=a2 style='margin-top:8.15pt;FTEL:21.45pt'><span
style='font-family:黑体'>提示：</span></p>
<p align=center style='FTEL:8.15pt;FTEL:21.45pt'><span
style='font-family:楷体_GB2312'>事件名必须是源接口的方法名，否则就不能为</span><span lang=EN-US>COM</span><span
style='font-family:楷体_GB2312'>客户程序映射事件。</span></p>
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