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<h3><span lang="EN-US">1.2.2<span style="mso-spacerun: yes"> </span></span><span style="font-family:楷体_GB2312;mso-ascii-font-family:"Times New Roman"">增加消息映射项</span></h3>
<p class="MsoNormal"><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"">本节介绍了如何增加消息映射项。</span></p>
<h4><span lang="EN-US">1</span><span style="font-family:黑体;mso-ascii-font-family:
"Times New Roman"">．实例说明</span></h4>
<p class="MsoNormal"><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"">本示例是一个简单的打字练习软件，程序在第一个编辑框随机显示一个大写字母，当用户在第</span><span lang="EN-US">2</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"">个编辑框中输入一个字符后，程序会在第一个编辑框中重新显示一个新字符。用户单击“确定”按钮结束练习时，可以获得正确输入的总次数，效果如图</span><span lang="EN-US">1-46</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"">所示。</span></p>
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<p class="a0"><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"">图</span><span lang="EN-US">1-46
Ex010202.exe</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"">效果图</span></p>
<p class="MsoNormal" align="center" style="text-align:center"><span lang="EN-US"> <o:p>
</o:p>
</span></p>
<h4><span lang="EN-US">2</span><span style="font-family:黑体;mso-ascii-font-family:
"Times New Roman"">．实现</span></h4>
<p class="MsoNormal"><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"">本实例的具体操作步骤如下。</span></p>
<p class="a5"><span style="font-family:楷体_GB2312;mso-ascii-font-family:"Times New Roman"">（</span><span lang="EN-US">1</span><span style="font-family:楷体_GB2312;mso-ascii-font-family:
"Times New Roman"">）新建一个基于对话框的工程</span><span lang="EN-US">Ex010202</span><span style="font-family:楷体_GB2312;mso-ascii-font-family:"Times New Roman"">。</span></p>
<p class="a5"><span style="font-family:楷体_GB2312;mso-ascii-font-family:"Times New Roman"">（</span><span lang="EN-US">2</span><span style="font-family:楷体_GB2312;mso-ascii-font-family:
"Times New Roman"">）在对话框上增加两个编辑框，</span><span lang="EN-US">ID</span><span style="font-family:楷体_GB2312;mso-ascii-font-family:"Times New Roman"">分别为</span><span lang="EN-US">ID_SHOW</span><span style="font-family:楷体_GB2312;mso-ascii-font-family:
"Times New Roman"">和</span><span lang="EN-US">ID_INPUT</span><span style="font-family:楷体_GB2312;mso-ascii-font-family:"Times New Roman"">。打开类向导，为</span><span lang="EN-US">ID_SHOW</span><span style="font-family:楷体_GB2312;mso-ascii-font-family:
"Times New Roman"">关联一个</span><span lang="EN-US">CEdit</span><span style="font-family:楷体_GB2312;mso-ascii-font-family:"Times New Roman"">型的变量</span><span lang="EN-US">m_show</span><span style="font-family:楷体_GB2312;mso-ascii-font-family:
"Times New Roman"">，为</span><span lang="EN-US">ID_INPUT</span><span style="font-family:楷体_GB2312;mso-ascii-font-family:"Times New Roman"">关联一个</span><span lang="EN-US">CEdit</span><span style="font-family:楷体_GB2312;mso-ascii-font-family:
"Times New Roman"">型的变量</span><span lang="EN-US">m_input</span><span style="font-family:楷体_GB2312;mso-ascii-font-family:"Times New Roman"">。</span></p>
<p class="a5"><span style="font-family:楷体_GB2312;mso-ascii-font-family:"Times New Roman"">（</span><span lang="EN-US">3</span><span style="font-family:楷体_GB2312;mso-ascii-font-family:
"Times New Roman"">）打开类向导，类名和</span><span lang="EN-US">Object
IDs</span><span style="font-family:楷体_GB2312;mso-ascii-font-family:"Times New Roman"">都选择</span><span lang="EN-US">CEx010202Dlg</span><span style="font-family:楷体_GB2312;mso-ascii-font-family:
"Times New Roman"">，</span><span lang="EN-US">Messages</span><span style="font-family:楷体_GB2312;mso-ascii-font-family:"Times New Roman"">中选择</span><span lang="EN-US">WM_INITDIALOG</span><span style="font-family:楷体_GB2312;mso-ascii-font-family:
"Times New Roman"">，类向导会自动选中对应的函数，双击此函数就可以编辑它了，如图</span><span lang="EN-US">1-47</span><span style="font-family:楷体_GB2312;mso-ascii-font-family:"Times New Roman"">所示。</span></p>
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<p class="a0"><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"">图</span><span lang="EN-US">1-47<span style="mso-spacerun: yes">
</span></span><span style="font-family:宋体;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">编辑函数</span></p>
<p class="a5"><span style="font-family:楷体_GB2312;mso-ascii-font-family:"Times New Roman"">（</span><span lang="EN-US">4</span><span style="font-family:楷体_GB2312;mso-ascii-font-family:
"Times New Roman"">）在此函数中禁用第一个编辑框，并为它生成初始值。</span></p>
<p class="ac"><span lang="EN-US">BOOL CEx010202Dlg::OnInitDialog()</span></p>
<p class="ac"><span lang="EN-US">{</span></p>
<p class="ac"><span lang="EN-US"><span style="mso-tab-count:1">
</span>CDialog::OnInitDialog();</span></p>
<p class="ac"><span lang="EN-US"> <o:p>
</o:p>
</span></p>
<p class="ac"><span lang="EN-US"><span style="mso-tab-count:1">
</span>m_show.SetReadOnly();//</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"">设置只读</span></p>
<p class="ac"><span lang="EN-US"><span style="mso-tab-count:1">
</span>char ch = 'A' + rand()% 26 ;//</span><span style="font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"">随机生成一个大写字母</span></p>
<p class="ac"><span lang="EN-US"><span style="mso-tab-count:1">
</span>CString strShow = ch ;</span></p>
<p class="ac"><span lang="EN-US"><span style="mso-tab-count:1">
</span>m_show.SetWindowText(strShow);</span></p>
<p class="ac"><span lang="EN-US">//…</span></p>
<p class="ac"><span lang="EN-US">}</span></p>
<p class="a5"><span style="font-family:楷体_GB2312;mso-ascii-font-family:"Times New Roman"">（</span><span lang="EN-US">5</span><span style="font-family:楷体_GB2312;mso-ascii-font-family:
"Times New Roman"">）为</span><span lang="EN-US">CEx010202Dlg</span><span style="font-family:楷体_GB2312;mso-ascii-font-family:"Times New Roman"">类增加一个保护级的成员变量</span><span lang="EN-US">int
m_iRightNum</span><span style="font-family:楷体_GB2312;mso-ascii-font-family:
"Times New Roman"">，并在</span><span lang="EN-US">CEx010202Dlg</span><span style="font-family:楷体_GB2312;mso-ascii-font-family:"Times New Roman"">类的构造函数中将其初始化为零，此变量用来记录正确输入次数。</span></p>
<p class="a5"><span style="font-family:楷体_GB2312;mso-ascii-font-family:"Times New Roman"">（</span><span lang="EN-US">6</span><span style="font-family:楷体_GB2312;mso-ascii-font-family:
"Times New Roman"">）当用户输入后，必须检查用户的输入是否正确，并重新生成数据。打开类向导，类名选择</span><span lang="EN-US">CEx010202Dlg</span><span style="font-family:楷体_GB2312;mso-ascii-font-family:
"Times New Roman"">，“</span><span lang="EN-US">Object IDs</span><span style="font-family:楷体_GB2312;mso-ascii-font-family:"Times New Roman"">”选择“</span><span lang="EN-US">IDC_INPUT</span><span style="font-family:楷体_GB2312;mso-ascii-font-family:
"Times New Roman"">”，“</span><span lang="EN-US">Messages</span><span style="font-family:楷体_GB2312;mso-ascii-font-family:"Times New Roman"">”选择“</span><span lang="EN-US">EN_CHANGE</span><span style="font-family:楷体_GB2312;mso-ascii-font-family:
"Times New Roman"">”，单击“</span><span lang="EN-US">Add
Function</span><span style="font-family:楷体_GB2312;mso-ascii-font-family:"Times New Roman"">”按钮，如图</span><span lang="EN-US">1-48</span><span style="font-family:楷体_GB2312;mso-ascii-font-family:
"Times New Roman"">所示。</span></p>
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