chap5_3.htm

非常好的应用vc＋＋6.0进行相关网络程序开发的教程

      </tr>
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    <font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY"></font><font SIZE="3">利用</font><font FACE="Times New Roman" SIZE="3">ClassWizard</font><font SIZE="3">可以很方便地为对话框类</font><font FACE="Times New Roman" SIZE="3">CRegisterDialog</font><font SIZE="3">加入成员变量。请读者按下列步骤操作。</p>
    <blockquote>
      <blockquote>
        <p ALIGN="JUSTIFY">按</font><font FACE="Times New Roman" SIZE="3">Ctrl+W</font><font SIZE="3">进入</font><font FACE="Times New Roman" SIZE="3">ClassWizard</font><font SIZE="3">。</p>
        <p ALIGN="JUSTIFY">选择</font><font FACE="Times New Roman" SIZE="3">ClassWizard</font><font SIZE="3">上部的</font><font FACE="Times New Roman" SIZE="3">Member Variables</font><font SIZE="3">标签，然后在</font><font FACE="Times New Roman" SIZE="3">Class name</font><font SIZE="3">栏中选择</font><font FACE="Times New Roman" SIZE="3">CRegisterDialog</font><font SIZE="3">。这时，在下面的变量列表中会出现对话框控件的</font><font FACE="Times New Roman" SIZE="3">ID</font><font SIZE="3">，如图</font><font FACE="Times New Roman" SIZE="3">5.7</font><font SIZE="3">所示。</p>
        <p ALIGN="center"><img src="T5_7.gif" alt="T5_7.tif (368576 bytes)" WIDTH="516" HEIGHT="337"></p>
        <p ALIGN="center">图<font FACE="Times New Roman" SIZE="3">5.7 ClassWizard</font>对话框</p>
        <p ALIGN="JUSTIFY">双击列表中的</font><font FACE="Times New Roman" SIZE="3">ID_AGE</font><font SIZE="3">会弹出</font><font FACE="Times New Roman" SIZE="3">Add Member Variable</font><font SIZE="3">对话框，如图</font><font FACE="Times New Roman" SIZE="3">5.8</font><font SIZE="3">所示。在</font><font FACE="Times New Roman" SIZE="3">Member variable name</font><font SIZE="3">栏中输入</font><font FACE="Times New Roman" SIZE="3">m_nAge</font><font SIZE="3">，在</font><font FACE="Times New Roman" SIZE="3">Category</font><font SIZE="3">栏中选择</font><font FACE="Times New Roman" SIZE="3">Value</font><font SIZE="3">，在</font><font FACE="Times New Roman" SIZE="3">Variable type</font><font SIZE="3">栏中选择</font><font FACE="Times New Roman" SIZE="3">UINT</font><font SIZE="3">。按</font><font FACE="Times New Roman" SIZE="3">OK</font><font SIZE="3">按钮后，数据变量</font><font FACE="Times New Roman" SIZE="3">m_nAge</font><font SIZE="3">就会被加入到变量列表中。</p>
        <p ALIGN="center"><img src="T5_8.gif" alt="T5_8.tif (157626 bytes)" WIDTH="423" HEIGHT="346"></p>
        <p ALIGN="center">图<font FACE="Times New Roman" SIZE="3">5.8 Add Member Variable</font>对话框</p>
        <p ALIGN="JUSTIFY">仿照第</font><font FACE="Times New Roman" SIZE="3">3</font><font SIZE="3">步和表</font><font FACE="Times New Roman" SIZE="3">5.4</font><font SIZE="3">，为各个控件加入相应的成员变量。</p>
        <p ALIGN="JUSTIFY">将</font><font FACE="Times New Roman" SIZE="3">m_nAge</font><font SIZE="3">的值限制在</font><font FACE="Times New Roman" SIZE="3">16</font><font SIZE="3">到</font><font FACE="Times New Roman" SIZE="3">65</font><font SIZE="3">之间。方法是先选择</font><font FACE="Times New Roman" SIZE="3">m_nAge</font><font SIZE="3">，然后在</font><font FACE="Times New Roman" SIZE="3">ClassWizard</font><font SIZE="3">对话框的左下角输入最大和最小值。</font><font FACE="Times New Roman" SIZE="3">m_nAge</font><font SIZE="3">代表年龄，这里规定被调查的人的年龄应在</font><font FACE="Times New Roman" SIZE="3">16</font><font SIZE="3">岁以上，</font><font FACE="Times New Roman" SIZE="3">64</font><font SIZE="3">岁以下。有了这个限制后，对话框会对输入的年龄值进行有效性检查，若输入的值不在限制范围内，则对话框会提示用户输入有效的值。</p>
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      </blockquote>
    </blockquote>
    <p><font SIZE="3">　</p>
    <p ALIGN="CENTER">表</font><font FACE="Times New Roman" SIZE="3">5.4</font></p>
    <table BORDER="1" CELLSPACING="1" CELLPADDING="1" WIDTH="579">
      <tr>
        <td WIDTH="33%"><font SIZE="3"><p ALIGN="JUSTIFY">控件</font><font FACE="Times New Roman" SIZE="3">ID</font></td>
        <td WIDTH="33%"><font SIZE="3"><p ALIGN="JUSTIFY">变量类型</font></td>
        <td WIDTH="33%"><font SIZE="3"><p ALIGN="JUSTIFY">变量名</font></td>
      </tr>
      <tr>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">IDC_AGE</font></td>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">UINT</font></td>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">m_nAge</font></td>
      </tr>
      <tr>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">IDC_INCOME</font></td>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">CString</font></td>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">m_strIncome</font></td>
      </tr>
      <tr>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">IDC_INCOME</font></td>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">CListBox</font></td>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">m_ctrlIncome</font></td>
      </tr>
      <tr>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">IDC_KIND</font></td>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">CString</font></td>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">m_strKind</font></td>
      </tr>
      <tr>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">IDC_MARRIED</font></td>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">BOOL</font></td>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">m_bMarried</font></td>
      </tr>
      <tr>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">IDC_NAME</font></td>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">CString</font></td>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">m_strName</font></td>
      </tr>
      <tr>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">IDC_SEX</font></td>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">int</font></td>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">m_nSex</font></td>
      </tr>
      <tr>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">IDC_UNIT</font></td>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">CString</font></td>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">m_strUnit</font></td>
      </tr>
      <tr>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">IDC_WORK</font></td>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">int</font></td>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">m_nWork</font></td>
      </tr>
    </table>
    <p><font SIZE="3">　</font><font FACE="Times New Roman" SIZE="3"></p>
    <p ALIGN="JUSTIFY"></font><font SIZE="3">　</font><font FACE="Times New Roman" SIZE="3"></p>
    <p ALIGN="JUSTIFY"></font><font SIZE="3">读者会注意到控件</font><font FACE="Times New Roman" SIZE="3">IDC_INCOME</font><font SIZE="3">居然有两个变量，一个是</font><font FACE="Times New Roman" SIZE="3">CString</font><font SIZE="3">型的，一个是</font><font FACE="Times New Roman" SIZE="3">CListBox</font><font SIZE="3">型的，这是完全合法的，不会引起任何冲突。之所以要加入</font><font FACE="Times New Roman" SIZE="3">CListBox</font><font SIZE="3">型的变量，是因为列表框的初始化要通过</font><font FACE="Times New Roman" SIZE="3">CListBox</font><font SIZE="3">对象进行。</font><font FACE="Times New Roman" SIZE="3"></p>
    </font><font SIZE="3"><div align="center"><center><table border="2" cellpadding="2" cellspacing="0" width="90%" bgcolor="#A6C0F0">
      <tr>
        <td width="100%">提示</font><font FACE="Times New Roman" SIZE="3">:</font><font SIZE="3">在</font><font FACE="Times New Roman" SIZE="3">ClassWizard</font><font SIZE="3">中可分别为一个控件指定一个数据变量和一个控件对象，这样做的好处是即能方便地获得数据，又能方便地控制控件。</font></td>
      </tr>
    </table>
    </center></div><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY"></font><font color="#3973DE" FACE="Times New Roman" SIZE="3">5.3.3</font><font SIZE="3" color="#3973DE">对话框的初始化</font><font FACE="Times New Roman" SIZE="3"></p>
    <p ALIGN="JUSTIFY"></font><font SIZE="3">对话框的初始化工作一般在构造函数和</font><font FACE="Times New Roman" SIZE="3">OnInitDialog</font><font SIZE="3">函数中完成。在构造函数中的初始化主要是针对对话框的数据成员。读者可以找到</font><font FACE="Times New Roman" SIZE="3">CRegisterDialog</font><font SIZE="3">的构造函数，如清单</font><font FACE="Times New Roman" SIZE="3">5.1</font><font SIZE="3">所示。</font><font FACE="Times New Roman" SIZE="3"></p>
    <p ALIGN="JUSTIFY"></font><font SIZE="3">　</p>
    <p ALIGN="JUSTIFY">清单</font><font FACE="Times New Roman" SIZE="3">5.1 CRegisterDialog</font><font SIZE="3">的构造函数</font><font FACE="Times New Roman" SIZE="3"></p>
    <p ALIGN="JUSTIFY">CRegisterDialog::CRegisterDialog(CWnd* pParent /*=NULL*/)</p>
    <p ALIGN="JUSTIFY">: CDialog(CRegisterDialog::IDD, pParent)</p>
    <p ALIGN="JUSTIFY">{</p>
    <p ALIGN="JUSTIFY">//{{AFX_DATA_INIT(CRegisterDialog)</p>
    <p ALIGN="JUSTIFY">m_nAge = 0;</p>