100165722.htm

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<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:18.45pt'><span lang=EN-US>public:</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>STDMETHOD(Greeting)(BSTR
name, BSTR* message);</span></p>

<p class=2 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'>在定制特性中，可以改变由</span><span lang=EN-US>.NET</span><span
style='font-family:楷体_GB2312'>包装类生成的类和接口的名称。只需给特性</span><span lang=EN-US>custom</span><span
style='font-family:楷体_GB2312'>添加标识符</span><span lang=EN-US>0F21F359-AB84-41e8-9A78-36D110E6D2F9</span><span
style='font-family:楷体_GB2312'>，并给</span><span lang=EN-US>.NET</span><span
style='font-family:楷体_GB2312'>中显示的内容指定名称即可。</span></p>

<p class=MsoNormal><span style='font-family:宋体'>在</span><span lang=EN-US>IWelcome</span><span
style='font-family:宋体'>接口的头文件部分，添加带有相同标识符和名称</span><span lang=EN-US>Wrox.ProCSharp.</span><span
style='font-family:宋体'>的定制特性</span><span lang=EN-US>COMInterop.Server.IWelcome</span><span
style='font-family:宋体'>。给类</span><span lang=EN-US>CCOMDemo</span><span
style='font-family:宋体'>添加带有相应名称的同一特性。</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>//IWelcome</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:27.65pt'><span lang=EN-US>object,</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;
uuid(&quot; 015ED275-3DE6-4716-A6FA-4EBC71E4A8EA&quot;),</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;
dual, helpstring(&quot;ICOMDemo Interface&quot;),</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;
pointer_default(unique)</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;
custom(0F21F359-AB84-41e8-9A78-36D110E6D2F9,</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:27.65pt'><span lang=EN-US>&nbsp;
&quot;Wrox.ProCSharp.COMInterop.Server.IWelcome&quot;)</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
IWelcome : IDispatch</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>&nbsp;
[id(1)] HRESULT Greeting([in] BSTR name, [out], retval) BSTR* message);</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'>现在给文件</span><span lang=EN-US>COMDemo.h</span><span
style='font-family:宋体'>添加第二个接口。可以把</span><span lang=EN-US>IWelcome</span><span
style='font-family:宋体'>接口的头文件部分复制到新接口</span><span lang=EN-US>IMath</span><span
style='font-family:宋体'>的头文件部分，但要确保修改用</span><span lang=EN-US>uuid</span><span
style='font-family:宋体'>关键字定义的惟一标识符。可以用实用工具</span><span lang=EN-US>guidgen</span><span
style='font-family:宋体'>生成这样一个</span><span lang=EN-US>ID</span><span
style='font-family:宋体'>。接口</span><span lang=EN-US>IMath</span><span
style='font-family:宋体'>提供了两个方法</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'>。</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>//IMath </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:27.65pt'><span lang=EN-US>object,</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;
uuid(&quot;2158751B-896E-461d-9012-EF1680BE0628&quot;),</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;
dual, helpstring(&quot;IMath Interface&quot;),</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;
pointer_default(unique)</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;
custom(0F21F359-AB84-41e8-9A78-36D110E6D2F9,</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:27.65pt'><span lang=EN-US>&nbsp;
&quot;Wrox.ProCSharp.COMInterop.Server.IMath&quot;)</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
IMath : IDispatch</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>&nbsp;
[id(1)] HRESULT Add([in] LONG val1, [in] LONG val2, [out, retval ] LONG*
result);</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;
[id(2)] HRESULT Sub([in] LONG val1, [in] LONG val2, [out, retval ] LONG*
result);</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'>类</span><span lang=EN-US>CCOMDemo</span><span
style='font-family:宋体'>必须修改，使之实现接口</span><span lang=EN-US>IWelcome</span><span
style='font-family:宋体'>和</span><span lang=EN-US>IMath</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>[</span></p>

<p class=a5 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;
coclass,</span></p>

<p class=a5 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;
threading(&quot;apartment&quot;),</span></p>

<p class=a5 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;
vi_progid(&quot;COMServer.COMDemo&quot;),</span></p>

<p class=a5 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;
progid(&quot;COMServer.COMDemo,1&quot;),</span></p>

<p class=a5 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;
version(1.0),</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;
custom(0F21F359-AB84-41e8-9A78-36D110E6D2F9,</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:27.65pt'><span lang=EN-US>&nbsp;
&quot;Wrox.ProCSharp.COMInterop.Server.ICOMDemo&quot;)</span></p>

<p class=a5 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;
uuid(2388AAA8-AD72-4022-948D-555316F708E8&quot;),</span></p>

<p class=a5 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;
helpstring(&quot;COMDemo Class&quot;)</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=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;
public IWelcome,&nbsp; public IMath</span></p>

<p class=a5 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>{</span></p>

<p class=MsoNormal><span style='font-family:宋体'>现在可以在文件</span><span lang=EN-US>COMDemo.cpp</span><span
style='font-family:宋体'>中用下面的代码执行以下</span><span lang=EN-US>3</span><span
style='font-family:宋体'>个方法了。</span><span lang=EN-US>CComBSTR</span><span
style='font-family:宋体'>是一个很容易处理</span><span lang=EN-US>BSTR</span><span
style='font-family:宋体'>的</span><span lang=EN-US>ATL</span><span
style='font-family:宋体'>类。在</span><span lang=EN-US>Greeting()</span><span
style='font-family:宋体'>方法中，只返回一个欢迎信息，并把第一个参数传入的名称添加到返回的信息中。</span><span
lang=EN-US>Add()</span><span style='font-family:宋体'>方法把两个值加在一起，而</span><span
lang=EN-US>Sub()</span><span style='font-family:宋体'>方法进行减法操作，返回相减的结果。</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>STDMETHODIMP CCOMDemo::Greeting(BSTR name, BSTR* 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>&nbsp;
CCOMBSTR tmp(&quot;Welcome, &quot;);</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;
tmp.Append(name);</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;
*message = tmp;</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;
return S_OK;</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>&nbsp;</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>STDMETHODIMP
CCOMDemo::Add(LONG val1, LONG val2, LONG* result)</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>&nbsp;
*result = val1 + val2;</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;
result S_OK;</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>&nbsp;</span></p>

<p class=2 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=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>&nbsp;
*result = val1 -- val2;</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;
return S_OK;</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'>现在就可以建立组件了。建立过程也是指在注册表中配置组件。</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='100165722.htm'><font color='red'>28.3.1  创建COM组件</font></a></h1>
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                        <div style='float:left;width:49%'>·<a href='100165719.htm'>28.1.9  事件处理</a></div><div style='float:right;width:49%'>·<a href='100165720.htm'>28.2  编组</a></div><div style='float:left;width:49%'>·<a href='100165721.htm'>28.3  在.NET客户程序中使用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='100165725.htm'>28.3.4  添加连接点</a></div></div>
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