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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt">Public<o:p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"">用来存储用户输入的字符数</span><span lang="EN-US" style="font-size:10.0pt"><o:p>
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<p ALIGN="justify" style="line-height: 150%; margin-top: 0; margin-bottom: 0"><font lang="ZH-CN" size="2">（2）在视图类中添加代码处理数据显示 </font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><span style="mso-bidi-font-size: 10.0pt; font-family: 宋体; mso-bidi-font-family: Times New Roman; mso-font-kerning: 10.5pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><font size="2">①</font></span>
<font size="2"><font LANG="ZH-CN">在类</font>CTextView<font LANG="ZH-CN">的构造函数中添加下面的代码，对变量</font>numberchar<font LANG="ZH-CN">进行初始化。</font></font></p>
<blockquote>
<blockquote>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2" color="#008000">CTextView::CTextView(
)</font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2" color="#008000">{</font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2" color="#008000">
numberchar=0;</font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2" color="#008000">}</font></p>
</blockquote>
</blockquote>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><span style="mso-bidi-font-size: 10.0pt; font-family: 宋体; mso-bidi-font-family: Times New Roman; mso-font-kerning: 10.5pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><font size="2">②</font></span><font size="2"><span style="mso-bidi-font-size: 10.0pt; font-family: 宋体; mso-bidi-font-family: Times New Roman; mso-font-kerning: 10.5pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">
</span></font><font size="2">构造消息映射：</font></p>
<blockquote>
<blockquote>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2" color="#008000">BEGIN_MESSAGE_MAP(CTextView,
CView)</font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2" color="#008000">
...</font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2" color="#008000">
ON_WM_CHAR( )</font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font color="#008000" size="2">
...</font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2" color="#008000">END_MESSAGE_MAP(
)</font></p>
</blockquote>
</blockquote>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">MFC<font LANG="ZH-CN">的消息映射宏</font>BEGIN_MESSAGE_MAP<font LANG="ZH-CN">把</font>Windows<font LANG="ZH-CN">系统发来的</font>WM_CHAR<font LANG="ZH-CN">消息连接到</font>CTextView<font LANG="ZH-CN">类的成员函数</font>OnChar()<font LANG="ZH-CN">上，即把这个成员函数作为处理</font>WM_CHAR<font LANG="ZH-CN">消息的过程。</font></font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"> </p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><span style="mso-bidi-font-size: 10.0pt; font-family: 宋体; mso-bidi-font-family: Times New Roman; mso-font-kerning: 10.5pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><font size="2">③</font></span><font size="2"><span style="mso-bidi-font-size: 10.0pt; font-family: 宋体; mso-bidi-font-family: Times New Roman; mso-font-kerning: 10.5pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">
</span><font LANG="ZH-CN">在</font>OnChar()<font LANG="ZH-CN">函数中添加如下的代码：</font></font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"> </p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font color="#008000"><font size="2">CTextDoc
*pdoc; //</font></font><font size="2"><font color="#008000"><font LANG="ZH-CN">定义一个指向文档类对象的指针</font>pdoc</font><font LANG="ZH-CN"></font></font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2" color="#008000">pdoc=GetDocument(
);//<font LANG="ZH-CN">获取指向当前视窗类所对应的文档类对象的指针，并把这个指针赋给定义的文档类型指针</font>pdoc</font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2" color="#008000">numberchar++;
//<font LANG="ZH-CN">将记录输入字符数的变量</font>numberchar<font LANG="ZH-CN">增</font>1</font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2" color="#008000"> </font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2" color="#008000">pdoc->text.Insert(numberchar,nChar);
//<font LANG="ZH-CN">根据从消息</font>WM_CHAR<font LANG="ZH-CN">传来的参数</font>nChar<font LANG="ZH-CN">，也就是键盘输入字符的</font>ASCII<font LANG="ZH-CN">码，</font></font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font color="#008000"><font lang="ZH-CN" size="2">
//</font><font size="2"><font LANG="ZH-CN">把输入的字符添加到文档中的字符串对象</font>text<font LANG="ZH-CN">中</font></font></font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2" color="#008000">CClientDC
clientdc(this);
//<font LANG="ZH-CN">定义并生成了一个当前视窗的客户区的设备描述表对象</font>clientdc<font LANG="ZH-CN">，</font>this</font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font color="#008000"><font size="2">
//</font><font LANG="ZH-CN" size="2">指代成员函数所在类的对象的指针</font></font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2" color="#008000">clientdc.TextOut(0,0,pdoc->text);
//<font LANG="ZH-CN">调用设备描述表</font>clientdc<font LANG="ZH-CN">的方法</font>textout<font LANG="ZH-CN">，在视窗的客户区中输出文档中</font></font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font color="#008000"><font lang="ZH-CN" size="2">
//</font><font size="2"><font LANG="ZH-CN">的字符串</font>text</font></font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2" color="#008000"> </font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font color="#008000"><font size="2">pdoc_>UpdateAllViews(this,0L,0);
//</font><font LANG="ZH-CN" size="2">通知本视窗所在的文档的所有其他视窗，文档中的数据已经更新，这些视窗</font></font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font lang="ZH-CN" size="2" color="#008000">
//应该重新从文档中取回数据用来显示，这样就维持了同一文档的所有视窗的</font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font lang="ZH-CN" size="2" color="#008000">
//数据一致性</font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font lang="ZH-CN" size="2"> </font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"> </p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><span style="mso-bidi-font-size: 10.0pt; font-family: 宋体; mso-bidi-font-family: Times New Roman; mso-font-kerning: 10.5pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><font size="2">④
</font></span><font size="2"><font LANG="ZH-CN">在</font>OnDraw()函数中添加如下代码：</font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font color="#008000" size="2">void
CTextView::OnDraw(CDC* pDC)</font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2" color="#008000">{</font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2" color="#008000">
CTextDoc* pDoc = GetDocument( );</font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2" color="#008000">
ASSERT_VALID(pDoc);</font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2" color="#008000">
pDC->TextOut(0,0,pDoc->text);</font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2" color="#008000">}</font></p>
<font SIZE="3">
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"></font><font size="2"><font LANG="ZH-CN">当窗口的大小改变的时候，应用程序会调用</font>OnDraw(
)<font LANG="ZH-CN">这个函数。</font></font><font size="2"><font LANG="ZH-CN">添加的这行代码的作用就是把字符串对象</font>text<font LANG="ZH-CN">重新显示在窗口的客户区当中，这样在窗口大小改变的时候，数据依然显示在窗口客户区中。</font></font></p>
<p style="line-height: 100%; text-indent: 0; margin: 0" class="右标题" align="left"> </p>
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