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<title>第六章：输入（三）</title>
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        <td width="100%"><font size="3" color="#8000FF"><strong><em>第六章：输入（三）</em></strong></font></td>
      </tr>
      <tr>
        <td width="100%" style="background-color: rgb(232,255,254)"><font FACE="宋体" SIZE="3"><p ALIGN="JUSTIFY">在下面的小程序中，我们通过三个滚动条分别代表</font><font SIZE="3">R</font><font FACE="宋体" SIZE="3">、</font><font SIZE="3">G</font><font FACE="宋体" SIZE="3">、</font><font SIZE="3">B</font><font FACE="宋体" SIZE="3">，滚动滚动条，将在右边的图片框中显示相应的颜色，并且在下面的文本框中显示颜色的十六进制数值。</p>
        <p ALIGN="JUSTIFY">现在，新建一个项目文件，在</font><font SIZE="3">Form1</font><font FACE="宋体" SIZE="3">中如图</font><font SIZE="3">6</font><font FACE="宋体" SIZE="3">－</font><font SIZE="3">12</font><font FACE="宋体" SIZE="3">布局控件，各控件属性如下表：</font></p>
        <p ALIGN="JUSTIFY"><img src="0612.gif" alt="0612.gif (3568 字节)" WIDTH="345" HEIGHT="267"></p>
        <table BORDER="1" CELLSPACING="1" CELLPADDING="7" WIDTH="379">
          <tr>
            <td WIDTH="46%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">HsrollBar</font></td>
            <td WIDTH="54%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">Name Hscroll1</p>
            <p ALIGN="JUSTIFY">Index 0</font><font FACE="宋体" SIZE="3">、</font><font SIZE="3">1</font><font FACE="宋体" SIZE="3">、</font><font SIZE="3">2</p>
            </font><font FACE="宋体" SIZE="3"><p ALIGN="JUSTIFY">（共同属性）</p>
            </font><font SIZE="3"><p ALIGN="JUSTIFY">Max 255</p>
            <p ALIGN="JUSTIFY">Min 0</p>
            <p ALIGN="JUSTIFY">LargeChange 10</p>
            <p ALIGN="JUSTIFY">SmallChange 1</font></td>
          </tr>
          <tr>
            <td WIDTH="46%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">Label</font></td>
            <td WIDTH="54%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">Name Label1</p>
            <p ALIGN="JUSTIFY">Index 0</font><font FACE="宋体" SIZE="3">、</font><font SIZE="3">1</font><font FACE="宋体" SIZE="3">、</font><font SIZE="3">2</p>
            <p ALIGN="JUSTIFY">Index 0 Caption </font><font FACE="宋体" SIZE="3">“红：”</font><font SIZE="3"> </p>
            <p ALIGN="JUSTIFY">Index 1 Caption </font><font FACE="宋体" SIZE="3">“绿：”</p>
            </font><font SIZE="3"><p ALIGN="JUSTIFY">Index 2 Caption </font><font FACE="宋体" SIZE="3">“蓝：”</font></td>
          </tr>
          <tr>
            <td WIDTH="46%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">Label</font></td>
            <td WIDTH="54%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">Name Label2</p>
            <p ALIGN="JUSTIFY">Caption </font><font FACE="宋体" SIZE="3">“颜色值”</font></td>
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          <tr>
            <td WIDTH="46%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">TextBox</font></td>
            <td WIDTH="54%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">Name Text1</p>
            <p ALIGN="JUSTIFY">Text </font><font FACE="宋体" SIZE="3">“”</font></td>
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            <td WIDTH="46%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">PictureBox</font></td>
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        <p><font FACE="宋体" SIZE="3">　</p>
        <p ALIGN="JUSTIFY">为了把十进制数值换成十六进制数值，要使用一个叫做</font><font SIZE="3">Hex</font><font FACE="宋体" SIZE="3">（）的函数，它把十进制数值转化为十六进制的字符，但对于只有一位的十六进制字符，这个函数并不在高位补零，为了视觉上的正确，我设计了一个小函数帮助它给一位的十六进制字符补零</font><font SIZE="3">.</font><font FACE="宋体" SIZE="3"></p>
        <p ALIGN="JUSTIFY">程序代码很简单，见下：</font><font SIZE="3"></p>
        <p ALIGN="JUSTIFY"></font><em><strong><font color="#004080" SIZE="3">Dim RedStr, GreenStr, 
        BlueStr As String</font><font color="#008000"><font SIZE="3">’RGB</font><font FACE="宋体" SIZE="3">的字符</font></font><font color="#004080"><br>
        </font><font color="#004080" SIZE="3">Dim RedNum, GreenNum, BlueNum As Integer</font><font color="#008000" SIZE="3">’RGB</font><font FACE="宋体" SIZE="3" color="#008000">的数值</font></strong></em><font SIZE="3"></p>
        </font><font FACE="宋体" SIZE="3"><p ALIGN="JUSTIFY"></font><font SIZE="3">　</p>
        <p ALIGN="JUSTIFY"><em><strong><font color="#004080">Function GetColorValue() As String</font></strong></em></p>
        <blockquote>
          <p ALIGN="JUSTIFY"><em><strong><font color="#008040"><font SIZE="3">‘</font><font FACE="宋体" SIZE="3">获得输入值</font></font><br>
          <font color="#004080">RedNum = HScroll1(0).Value<br>
          GreenNum = HScroll1(1).Value<br>
          BlueNum = HScroll1(2).Value</font></strong></em></p>
          <p ALIGN="JUSTIFY"><em><strong><font color="#004080">RedStr = Hex(RedNum)</font><br>
          <font color="#004080" SIZE="3">If Len(RedStr) &lt; 2 Then RedStr = &quot;0&quot; + RedStr</font><font color="#008040"><font SIZE="3">’</font><font FACE="宋体" SIZE="3">补零</font></font></strong></em></p>
          <p ALIGN="JUSTIFY"><em><strong><font color="#004080">GreenStr = Hex(GreenNum)<br>
          If Len(GreenStr) &lt; 2 Then GreenStr = &quot;0&quot; + GreenStr</font></strong></em></p>
          <p ALIGN="JUSTIFY"><em><strong><font color="#004080">BlueStr = Hex(BlueNum)<br>
          If Len(BlueStr) &lt; 2 Then BlueStr = &quot;0&quot; + BlueStr</font></strong></em></p>
          <p ALIGN="JUSTIFY"><em><strong><font color="#004080" SIZE="3">GetColorValue = RedStr + 
          GreenStr + BlueStr</font><font color="#008040"><font SIZE="3">’</font><font FACE="宋体" SIZE="3">合并</font></font></strong></em></p>
        </blockquote>
        <p ALIGN="JUSTIFY"><em><strong><font color="#004080">End Function</font></strong></em></p>
        <p ALIGN="JUSTIFY"><em><strong><font color="#004080">Private Sub Form_Load()</font></strong></em></p>
        <blockquote>
          <p ALIGN="JUSTIFY"><em><strong><font color="#008040" SIZE="3">‘</font><font FACE="宋体" SIZE="3" color="#008040">初始化程序</font><br>
          <font color="#004080">Text1.Text = GetColorValue<br>
          Picture1.BackColor = RGB(RedNum, GreenNum, BlueNum)</font><font color="#008040">'RGB函数返回颜色值</font></strong></em></p>
        </blockquote>
        <p ALIGN="JUSTIFY"><em><strong><font color="#004080">End Sub</font></strong></em></p>
        <p ALIGN="JUSTIFY">　</p>
        <p ALIGN="JUSTIFY"><em><strong><font color="#004080">Private Sub HScroll1_Change(Index As 
        Integer)</font></strong></em></p>
        <blockquote>
          <p ALIGN="JUSTIFY"><em><strong><font color="#008000" SIZE="3">‘</font><font FACE="宋体" SIZE="3" color="#008000">当滚动条被改变时</font><br>
          <font color="#004080">Text1.Text = GetColorValue<br>
          Picture1.BackColor = RGB(RedNum, GreenNum, BlueNum)</font></strong></em></p>
        </blockquote>
        <p ALIGN="JUSTIFY"><em><strong><font color="#004080">End Sub</font></strong></em></font><font FACE="宋体" SIZE="3"></p>
        <p ALIGN="JUSTIFY">运行如图</font><font SIZE="3">6</font><font FACE="宋体" SIZE="3">－</font><font SIZE="3">13</font><font FACE="宋体" SIZE="3">。</p>
        <p ALIGN="JUSTIFY"><img src="0613.gif" alt="0613.gif (3820 字节)" WIDTH="345" HEIGHT="267"></font></td>
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