100165725.htm
来自「C#高级编程(第三版),顶死你们。。 。up」· HTM 代码 · 共 304 行 · 第 1/2 页
HTM
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<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:27.65pt'><span lang=EN-US>}</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:27.65pt'><span lang=EN-US>__event
__interface _ICompletedEvents;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:27.65pt'><span lang=EN-US>void
FireCompleted()</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:27.65pt'><span lang=EN-US>{</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:27.65pt'><span lang=EN-US>
__raise Completed();</span></p>
<p class=2 style='margin-top:0cm;margin-right:0cm;FTEL:8.15pt;
margin-left:21.45pt;FTEL:27.65pt'><span lang=EN-US>}</span></p>
<p class=MsoNormal><span style='font-family:宋体'>最后，在文件</span><span lang=EN-US>COMDemo.cpp</span><span
style='font-family:宋体'>的</span><span lang=EN-US>Add()</span><span
style='font-family:宋体'>和</span><span lang=EN-US>Sub()</span><span
style='font-family:宋体'>方法中调用方法</span><span lang=EN-US>FireCompleted()</span><span
style='font-family:宋体'>。</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>STDMETHODIMP CCOMDemo::Add(LONG val1, LONG val2, LONG* 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>
*result = val1 + val2;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:27.65pt'><span lang=EN-US>FireCompleted();</span></p>
<p class=a5 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
result S_OK;</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>STDMETHODIMP
CCOMDemo::Sub(LONG val1, LONG val2, LONG* 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>
*result = val1 - val2;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:27.65pt'><span lang=EN-US>FireCompleted();</span></p>
<p class=a5 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
return S_OK;</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'>在重新建立</span><span lang=EN-US>COM
DLL</span><span style='font-family:宋体'>之后，就可以把</span><span lang=EN-US>.NET</span><span
style='font-family:宋体'>客户改为使用这些</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>事件。</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> static void Main(string[] args)</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>
COMDemo obj = new COMDemoClass();</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>
IWelcome welcome = (IWelcome)obj;</span></p>
<p class=a5 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
Console.WriteLine(welcome.Greeting("Christian"));</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>
obj.Completed +=</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
new ICompletedEvents_CompletedEventHandler(Completed);</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>
IMath math = (IMath) welcome;</span></p>
<p class=a5 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
int result = math.Add(3,5);</span></p>
<p class=a5 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
Console.WriteLine(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>
Marshal.ReleaseComObject(math);</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=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>private
static void Completed()</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>
Console.WriteLine("Calculation completed");</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'>可以看出，</span><span lang=EN-US>RCW</span><span
style='font-family:宋体'>提供了从</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>事件到</span><span lang=EN-US>.NET</span><span
style='font-family:宋体'>事件的自动映射。可以在</span><span lang=EN-US>.NET</span><span
style='font-family:宋体'>客户中像使用</span><span lang=EN-US>.NET</span><span
style='font-family:宋体'>事件那样使用</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>事件。</span></p>
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<h1 id="divCurrentNode2" style="color: #b83507; width: 100%; text-align: left; font-size: 12px; padding-left: 2px">当前章节:<a href='100165725.htm'><font color='red'>28.3.4 添加连接点</font></a></h1>
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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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