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<title>第六章：输入（二）</title>
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        <td width="100%"><font size="3" color="#8000FF"><strong><em>第六章：输入（二）</em></strong></font></td>
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      <tr>
        <td width="100%" style="background-color: rgb(232,255,254)"><font FACE="宋体" SIZE="3"><p ALIGN="JUSTIFY">与无线钮相对的是检查框，在同一范围内一组无线钮只能有一个被选中，而检查框则可以有多个选择，就象在添表时，性别那项只能有一个选择，而在描述你以前的职业时可以有学生、程序员、家庭教师或者什么，总之有很多选择，下面我们举一个简单的例子加以说明。</p>
        <p ALIGN="JUSTIFY">假设编写了一个共享软件，在让用户注册的时候你想知道你的用户使用的计算机情况，你就需要一个调查表，为了使这个调查表不止枯燥，可以在这个程序中加入一些图形。新建一个项目文件，窗体布局如图</font><font SIZE="3">6</font><font FACE="宋体" SIZE="3">－</font><font SIZE="3">10</font><font FACE="宋体" SIZE="3">。</p>
        <p ALIGN="JUSTIFY"><img src="06-10.gif" alt="06-10.gif (5197 字节)" WIDTH="393" HEIGHT="320"></p>
        <p ALIGN="JUSTIFY">程序很简单，一共有两个框架（</font><font SIZE="3">Frame1</font><font FACE="宋体" SIZE="3">和</font><font SIZE="3">Frame2</font><font FACE="宋体" SIZE="3">），它们的</font><font SIZE="3">Caption</font><font FACE="宋体" SIZE="3">分别为“选择你的计算机拥有的配置”和“这是你的计算机系统”，在</font><font SIZE="3">Frame1</font><font FACE="宋体" SIZE="3">有四个检查框（</font><font SIZE="3">Check1</font><font FACE="宋体" SIZE="3">到</font><font SIZE="3">Check4</font><font FACE="宋体" SIZE="3">），</font><font SIZE="3">Caption</font><font FACE="宋体" SIZE="3">分别为“网络系统”、“鼠标”、“密码保护”和“电子邮件”，另把</font><font SIZE="3">Check4</font><font FACE="宋体" SIZE="3">的</font><font SIZE="3">Enabled</font><font FACE="宋体" SIZE="3">属性改为</font><font SIZE="3">False</font><font FACE="宋体" SIZE="3">，使其无效；在</font><font SIZE="3">Frame2</font><font FACE="宋体" SIZE="3">中放置四个图片框（</font><font SIZE="3">Picture1</font><font FACE="宋体" SIZE="3">到</font><font SIZE="3">Picture4</font><font FACE="宋体" SIZE="3">）与四个检查框向对应，请把所有图片框的</font><font SIZE="3">BorderStyle</font><font FACE="宋体" SIZE="3">属性设为</font><font SIZE="3">0</font><font FACE="宋体" SIZE="3">（无边框），它们的</font><font SIZE="3">Picture</font><font FACE="宋体" SIZE="3">属性请根据上图，在存放图标的目录中找到相对的图标。下面是程序代码：</font><font SIZE="3"></p>
        <p ALIGN="JUSTIFY"><font color="#004080">Private Sub Check1_Click()</font></p>
        <blockquote>
          <p ALIGN="JUSTIFY"><font color="#004080">If Check1.Value Then</font></p>
          <blockquote>
            <p ALIGN="JUSTIFY"><font color="#004080">Check4.Enabled = -1<br>
            Picture1.Visible = -1</font></p>
          </blockquote>
          <p ALIGN="JUSTIFY"><font color="#004080">Else: Check4.Enabled = 0<br>
          Picture1.Visible = 0<br>
          Check4.Value = 0<br>
          Picture4.Visible = 0</font></p>
          <p ALIGN="JUSTIFY"><font color="#004080">End If</font></p>
        </blockquote>
        <p ALIGN="JUSTIFY"><font color="#004080">End Sub</font></font><font FACE="宋体" SIZE="3"></p>
        <p ALIGN="JUSTIFY"></font><font SIZE="3">　</p>
        <p ALIGN="JUSTIFY"><font color="#004080">Private Sub Check2_Click()</font></p>
        <blockquote>
          <p ALIGN="JUSTIFY"><font color="#004080">If Check2.Value Then</font></p>
          <blockquote>
            <p ALIGN="JUSTIFY"><font color="#004080">Picture2.Visible = -1</font></p>
          </blockquote>
          <p ALIGN="JUSTIFY"><font color="#004080">Else: Picture2.Visible = 0</font></p>
          <p ALIGN="JUSTIFY"><font color="#004080">End If</font></p>
        </blockquote>
        <p ALIGN="JUSTIFY"><font color="#004080">End Sub</font></font><font FACE="宋体" SIZE="3"></p>
        <p ALIGN="JUSTIFY"></font><font SIZE="3">　</p>
        <p ALIGN="JUSTIFY"><font color="#004080">Private Sub Check3_Click()</font></p>
        <blockquote>
          <p ALIGN="JUSTIFY"><font color="#004080">If Check3.Value Then</font></p>
          <blockquote>
            <p ALIGN="JUSTIFY"><font color="#004080">Picture3.Visible = -1</font></p>
          </blockquote>
          <p ALIGN="JUSTIFY"><font color="#004080">Else: Picture3.Visible = 0</font></p>
          <p ALIGN="JUSTIFY"><font color="#004080">End If</font></p>
        </blockquote>
        <p ALIGN="JUSTIFY"><font color="#004080">End Sub</font></p>
        <p ALIGN="JUSTIFY">　</p>
        <p ALIGN="JUSTIFY"><font color="#004080">Private Sub Check4_Click()</font></p>
        <blockquote>
          <p ALIGN="JUSTIFY"><font color="#004080">If Check4.Value Then</font></p>
          <blockquote>
            <p ALIGN="JUSTIFY"><font color="#004080">Picture4.Visible = -1</font></p>
          </blockquote>
          <p ALIGN="JUSTIFY"><font color="#004080">Else: Picture4.Visible = 0</font></p>
          <p ALIGN="JUSTIFY"><font color="#004080">End If</font></p>
        </blockquote>
        <p ALIGN="JUSTIFY"><font color="#004080">End Sub</font></font><font FACE="宋体" SIZE="3"></p>
        <p ALIGN="JUSTIFY"></font><img src="06-11.gif" alt="06-11.gif (4875 字节)" WIDTH="393" HEIGHT="320"><font FACE="宋体" SIZE="3"></p>
        <p ALIGN="JUSTIFY">这个程序比我们见过的任何程序都简单，就不再做说明。</p>
        <p ALIGN="JUSTIFY">（第六章</font><font SIZE="3"> </font><font FACE="宋体" SIZE="3">未完）</font></td>
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