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<title>第七章：输出（一）</title>
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    <div align="center"><center><table border="0" cellpadding="8" cellspacing="0" width="100%">
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        <td width="100%"><font size="3" color="#8000FF"><strong><em>第七章：输出（一）</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">上一章里，我们讨论的</font><font SIZE="3">VB</font><font FACE="宋体" SIZE="3">的输人机制，这次我们来集中讨论</font><font SIZE="3">VB</font><font FACE="宋体" SIZE="3">中信息的输出。</p>
        <p ALIGN="JUSTIFY">输入和输出是不可分割的，人们输入的最终目的是希望计算机作出反应，任何一个程序都不可能避开这个问题，所以就算要完成一个最基本的程序，也要有输出的部分，复杂的程序更是如此。</p>
        <p ALIGN="JUSTIFY">在输入的一章里，我们学习的第一个输入方法是</font><font SIZE="3">InputBox</font><font FACE="宋体" SIZE="3">，相应的在输出中我们第一个要接触的是</font><font SIZE="3">MsgBox</font><font FACE="宋体" SIZE="3">（</font><font SIZE="3">Message Box</font><font FACE="宋体" SIZE="3">），和</font><font SIZE="3">InputBox</font><font FACE="宋体" SIZE="3">相似，</font><font SIZE="3">MsgBox</font><font FACE="宋体" SIZE="3">也是简化了的窗体，可以以函数的形式返回操作。它的基本语法是：</font><font SIZE="3"></p>
        <p ALIGN="JUSTIFY">MsgBox &quot;</font><font FACE="宋体" SIZE="3">显示内容</font><font SIZE="3">&quot;,</font><font FACE="宋体" SIZE="3">按钮值</font><font SIZE="3">,&quot;</font><font FACE="宋体" SIZE="3">标题</font><font SIZE="3">&quot;</font><font FACE="宋体" SIZE="3"></p>
        <p ALIGN="JUSTIFY">通过这个函数可以产生一个标准的</font><font SIZE="3">Windows</font><font FACE="宋体" SIZE="3">消息框，象我们平时经常接触的“</font><font SIZE="3">Yes/No</font><font FACE="宋体" SIZE="3">”、“</font><font SIZE="3">OK/Cancel</font><font FACE="宋体" SIZE="3">”，“</font><font SIZE="3">Retry/Abort/Ignore</font><font FACE="宋体" SIZE="3">”等等，这些都是在按钮值中设定的，按钮值如下：</font></p>
        <table BORDER="1" CELLSPACING="1" CELLPADDING="7" WIDTH="223">
          <tr>
            <td WIDTH="30%" VALIGN="TOP"><font FACE="宋体" SIZE="3"><p ALIGN="JUSTIFY">数值</font></td>
            <td WIDTH="70%" VALIGN="TOP"><font FACE="宋体" SIZE="3"><p ALIGN="JUSTIFY">含义</font></td>
          </tr>
          <tr>
            <td WIDTH="30%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">0</font></td>
            <td WIDTH="70%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">OK</font></td>
          </tr>
          <tr>
            <td WIDTH="30%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">1</font></td>
            <td WIDTH="70%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">OK</font><font FACE="宋体" SIZE="3">和</font><font SIZE="3">Cancel</font></td>
          </tr>
          <tr>
            <td WIDTH="30%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">2</font></td>
            <td WIDTH="70%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">Abort</font><font FACE="宋体" SIZE="3">、</font><font SIZE="3">Retry</font><font FACE="宋体" SIZE="3">和</font><font SIZE="3">Ignore</font></td>
          </tr>
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            <td WIDTH="30%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">3</font></td>
            <td WIDTH="70%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">Yes</font><font FACE="宋体" SIZE="3">、</font><font SIZE="3">No</font><font FACE="宋体" SIZE="3">和</font><font SIZE="3">Cancel</font></td>
          </tr>
          <tr>
            <td WIDTH="30%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">4</font></td>
            <td WIDTH="70%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">Yes</font><font FACE="宋体" SIZE="3">和</font><font SIZE="3">No</font></td>
          </tr>
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            <td WIDTH="30%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">5</font></td>
            <td WIDTH="70%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">Retry</font><font FACE="宋体" SIZE="3">和</font><font SIZE="3">Cancel</font></td>
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        <p>　<font FACE="宋体" SIZE="3"></p>
        <p ALIGN="JUSTIFY">并且不同的消息可以搭配不同的图标，比如帮助文件用问号，一般提示用一个圈里一个</font><font SIZE="3">I</font><font FACE="宋体" SIZE="3">等等，它们也是按钮值的一部分：</font></p>
        <table BORDER="1" CELLSPACING="1" CELLPADDING="7" WIDTH="223">
          <tr>
            <td WIDTH="30%" VALIGN="TOP"><font FACE="宋体" SIZE="3"><p ALIGN="JUSTIFY">数值</font></td>
            <td WIDTH="70%" VALIGN="TOP"><font FACE="宋体" SIZE="3"><p ALIGN="JUSTIFY">含义</font></td>
          </tr>
          <tr>
            <td WIDTH="30%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">16</font></td>
            <td WIDTH="70%" VALIGN="TOP"><font FACE="宋体" SIZE="3"><p ALIGN="JUSTIFY">表示危险</font></td>
          </tr>
          <tr>
            <td WIDTH="30%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">32</font></td>
            <td WIDTH="70%" VALIGN="TOP"><font FACE="宋体" SIZE="3"><p ALIGN="JUSTIFY">表示问号</font></td>
          </tr>
          <tr>
            <td WIDTH="30%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">48</font></td>
            <td WIDTH="70%" VALIGN="TOP"><font FACE="宋体" SIZE="3"><p ALIGN="JUSTIFY">表示警告</font></td>
          </tr>
          <tr>
            <td WIDTH="30%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">64</font></td>
            <td WIDTH="70%" VALIGN="TOP"><font FACE="宋体" SIZE="3"><p ALIGN="JUSTIFY">表示信息</font></td>
          </tr>
        </table>
        <p>　<font FACE="宋体" SIZE="3"></p>
        <p ALIGN="JUSTIFY">但是如何既显示按钮也显示相应的图标呢，请看一会儿下面的例子。前面说过，</font><font SIZE="3">MsgBox</font><font FACE="宋体" SIZE="3">是函数，那么它就会有返回值，当你按下某个按钮就会返回一个数值，以便对用户不同动作的捕捉，返回值如下：</font></p>
        <table BORDER="1" CELLSPACING="1" CELLPADDING="7" WIDTH="223">
          <tr>
            <td WIDTH="30%" VALIGN="TOP"><font FACE="宋体" SIZE="3"><p ALIGN="JUSTIFY">数值</font></td>
            <td WIDTH="70%" VALIGN="TOP"><font FACE="宋体" SIZE="3"><p ALIGN="JUSTIFY">含义</font></td>
          </tr>
          <tr>
            <td WIDTH="30%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">1</font></td>
            <td WIDTH="70%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">OK</font></td>
          </tr>
          <tr>
            <td WIDTH="30%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">2</font></td>
            <td WIDTH="70%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">Cancel</font></td>
          </tr>
          <tr>
            <td WIDTH="30%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">3</font></td>
            <td WIDTH="70%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">Abort</font></td>
          </tr>
          <tr>
            <td WIDTH="30%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">4</font></td>
            <td WIDTH="70%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">Retry</font></td>
          </tr>
          <tr>
            <td WIDTH="30%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">5</font></td>
            <td WIDTH="70%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">Ignore</font></td>
          </tr>
          <tr>
            <td WIDTH="30%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">6</font></td>
            <td WIDTH="70%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">Yes</font></td>
          </tr>
          <tr>
            <td WIDTH="30%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">7</font></td>
            <td WIDTH="70%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">No</font></td>
          </tr>
        </table>
        </td>
      </tr>
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