📄 csdn_文档中心_wtl for mfc programming实践篇 --- 一个自定义combobox的移植过程(下).htm
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lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt"><SPAN
style="mso-tab-count: 1">
</SPAN></SPAN><SPAN
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt">可是这里忽视了一个基本的<SPAN
lang=EN-US>WTL</SPAN>特性，由于<SPAN lang=EN-US>WTL</SPAN>基于<SPAN
lang=EN-US>ATL</SPAN>，而设计<SPAN
lang=EN-US>ATL</SPAN>就是为了将接口和实现分开，所以在<SPAN
lang=EN-US>WTL</SPAN>中所有不带<SPAN
lang=EN-US>Impl</SPAN>字样的类都不是实现类，像<SPAN
lang=EN-US>CWindow</SPAN>，<SPAN lang=EN-US>CButton</SPAN>，<SPAN
lang=EN-US>CComboBox</SPAN>等等，他们只是包含一个句柄，没有自己的事件，他们只是负责中转，封装控件事件等等。像<SPAN
lang=EN-US>CComboBox</SPAN>的操作符“<SPAN
lang=EN-US>=</SPAN>”就只是一个赋值语句而已。而<SPAN
lang=EN-US>DDX_CONTROL_HANDLER</SPAN>正是为这些类服务的，当然如果我们注意到这个宏得注释，也许早就发现这个问题了，还记得吗？在这里重温一下吧：<SPAN
lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P align=left class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-layout-grid-align: none"><SPAN
lang=EN-US style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt"><SPAN
style="mso-tab-count: 1">
</SPAN></SPAN><SPAN lang=EN-US
style="COLOR: green; FONT-FAMILY: 新宋体; FONT-SIZE: 9pt; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 0pt">//
Full control subclassing (for CWindowImpl derived
controls)<o:p></o:p></SPAN></P>
<P align=left class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; TEXT-INDENT: 21pt; mso-layout-grid-align: none"><SPAN
lang=EN-US
style="COLOR: blue; FONT-FAMILY: 新宋体; FONT-SIZE: 9pt; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 0pt">template</SPAN><SPAN
lang=EN-US
style="FONT-FAMILY: 新宋体; FONT-SIZE: 9pt; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 0pt">
<<SPAN style="COLOR: blue">class</SPAN>
TControl><o:p></o:p></SPAN></P>
<P align=left class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-layout-grid-align: none"><SPAN
lang=EN-US
style="FONT-FAMILY: 新宋体; FONT-SIZE: 9pt; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 0pt"><SPAN
style="mso-tab-count: 1"> </SPAN><SPAN
style="COLOR: blue">void</SPAN> DDX_Control(UINT nID, TControl&
ctrl, BOOL bSave)<o:p></o:p></SPAN></P>
<P align=left class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; TEXT-INDENT: 21pt; mso-layout-grid-align: none"><SPAN
lang=EN-US
style="COLOR: green; FONT-FAMILY: 宋体; FONT-SIZE: 9pt"><o:p> </o:p></SPAN></P>
<P align=left class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; TEXT-INDENT: 21pt; mso-layout-grid-align: none"><SPAN
lang=EN-US style="COLOR: green; FONT-FAMILY: 宋体; FONT-SIZE: 9pt">//
Simple control attaching (for HWND wrapper controls)</SPAN><SPAN
lang=EN-US
style="COLOR: green; FONT-FAMILY: 新宋体; FONT-SIZE: 9pt; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 0pt"><o:p></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt"><SPAN
style="mso-tab-count: 1"> </SPAN>template
<class TControl><o:p></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt"><SPAN
style="mso-tab-count: 1"> </SPAN>void
DDX_Control_Handle(UINT nID, TControl& ctrl, BOOL
bSave)<o:p></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt"><SPAN
style="mso-tab-count: 1">
</SPAN></SPAN><SPAN
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt">好了，在环游地球一周以后，我们又回到了起点，虽然费了不少的力气，但也搞清楚不少的东西，下面大概地总结一下：<SPAN
lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 39pt; TEXT-INDENT: -18pt; mso-list: l0 level1 lfo1; tab-stops: list 39.0pt"><SPAN
lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt; mso-bidi-font-family: 宋体"><SPAN
style="mso-list: Ignore">1.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt">WTL</SPAN><SPAN
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt">的类包含接口类（只包含窗体句柄和事件的封装）和实现类（可以拥有自己的事件），要根据具体情况有选择的使用。<SPAN
lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 39pt; TEXT-INDENT: -18pt; mso-list: l0 level1 lfo1; tab-stops: list 39.0pt"><SPAN
lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt; mso-bidi-font-family: 宋体"><SPAN
style="mso-list: Ignore">2.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt">WTL</SPAN><SPAN
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt">不会自动销毁窗体句柄（当然是指接口类），所以<SPAN
lang=EN-US>Attach</SPAN>操作以后要记着<SPAN
lang=EN-US>Detach<o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 39pt; TEXT-INDENT: -18pt; mso-list: l0 level1 lfo1; tab-stops: list 39.0pt"><SPAN
lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt; mso-bidi-font-family: 宋体"><SPAN
style="mso-list: Ignore">3.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><SPAN
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt">注意包含有<SPAN
lang=EN-US>HANDLE</SPAN>的宏，类，函数，它们往往是接口类或为接口类服务的，如上面所说的<SPAN
lang=EN-US>DDX_Control_Handle</SPAN>，以及<SPAN
lang=EN-US>CDCHandle</SPAN>等等。<SPAN
lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 39pt; TEXT-INDENT: -18pt; mso-list: l0 level1 lfo1; tab-stops: list 39.0pt"><SPAN
lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt; mso-bidi-font-family: 宋体"><SPAN
style="mso-list: Ignore">4.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt">DDX</SPAN><SPAN
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt">是通过宏定义重载<SPAN
lang=EN-US>CWinDataExchange::DoDataExchange()</SPAN>函数实现的<SPAN
lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 39pt; TEXT-INDENT: -18pt; mso-list: l0 level1 lfo1; tab-stops: list 39.0pt"><SPAN
lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt; mso-bidi-font-family: 宋体"><SPAN
style="mso-list: Ignore">5.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><SPAN
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt">消息反射是在取道发送消息的窗体句柄后，通过像它回发相应的消息来实现的。<SPAN
lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 39pt; TEXT-INDENT: -18pt; mso-list: l0 level1 lfo1; tab-stops: list 39.0pt"><SPAN
lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt; mso-bidi-font-family: 宋体"><SPAN
style="mso-list: Ignore">6.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><SPAN
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt">当你想说这不可能的时候，往往是你在调用的方法上出现了错误。<SPAN
lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 39pt; TEXT-INDENT: -18pt; mso-list: l0 level1 lfo1; tab-stops: list 39.0pt"><SPAN
lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt; mso-bidi-font-family: 宋体"><SPAN
style="mso-list: Ignore">7.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><SPAN
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt">多看看代码，你会了解得更多。<SPAN
lang=EN-US><o:p></o:p></SPAN></SPAN></P><BR></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE><BR>
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