📄 example19-1.htm
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<img src="exampl10.jpg" v:shapes="_x0000_i1025" width="228" height="133"></span></p>
<p ALIGN="center" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><span style="font-size: 10.5pt; mso-bidi-font-size: 10.0pt; font-family: Times New Roman; mso-fareast-font-family: 宋体; mso-font-kerning: 10.5pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA" lang="EN-US">图19-2
典型的记录视图</span></p>
<p ALIGN="left" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2" face="黑体"><font LANG="ZH-CN">
表</font>19-2 <font LANG="ZH-CN">记录处理按钮</font></font></p>
<table border="1" cellspacing="0" cellpadding="0" style="border-collapse:collapse;
mso-table-layout-alt:fixed;border:none;mso-border-alt:solid windowtext .5pt;
mso-padding-alt:0cm 5.4pt 0cm 5.4pt" bgcolor="#CCFFCC">
<tr>
<td width="194" valign="top" style="width:145.35pt;border:solid windowtext .5pt;
padding:0cm 5.4pt 0cm 5.4pt" align="center">
<p class="MsoHeading8"><font size="2">按钮标题<span lang="EN-US"><o:p>
</o:p>
</span></font></p>
</td>
<td width="194" valign="top" style="width:145.35pt;border:solid windowtext .5pt;
border-left:none;mso-border-left-alt:solid windowtext .5pt;padding:0cm 5.4pt 0cm 5.4pt" align="center">
<p class="MsoHeading8"><font size="2">按钮<span lang="EN-US">ID<o:p>
</o:p>
</span></font></p>
</td>
<td width="194" valign="top" style="width:145.35pt;border:solid windowtext .5pt;
border-left:none;mso-border-left-alt:solid windowtext .5pt;padding:0cm 5.4pt 0cm 5.4pt" align="center">
<p class="MsoHeading8"><font size="2">单击消息处理函数<span lang="EN-US"><o:p>
</o:p>
</span></font></p>
</td>
</tr>
<tr>
<td width="194" valign="top" style="width:145.35pt;border:solid windowtext .5pt;
border-top:none;mso-border-top-alt:solid windowtext .5pt;padding:0cm 5.4pt 0cm 5.4pt">
<p class="MsoNormal"><font size="2"><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">添加新记录</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><o:p>
</o:p>
</span></font></p>
</td>
<td width="194" valign="top" style="width:145.35pt;border-top:none;border-left:
none;border-bottom:solid windowtext .5pt;border-right:solid windowtext .5pt;
mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
padding:0cm 5.4pt 0cm 5.4pt">
<p class="MsoNormal"><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><font size="2">IDC_ADD<o:p>
</o:p>
</font></span></p>
</td>
<td width="194" valign="top" style="width:145.35pt;border-top:none;border-left:
none;border-bottom:solid windowtext .5pt;border-right:solid windowtext .5pt;
mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
padding:0cm 5.4pt 0cm 5.4pt">
<p class="MsoNormal"><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><font size="2">OnAdd()<o:p>
</o:p>
</font></span></p>
</td>
</tr>
<tr>
<td width="194" valign="top" style="width:145.35pt;border:solid windowtext .5pt;
border-top:none;mso-border-top-alt:solid windowtext .5pt;padding:0cm 5.4pt 0cm 5.4pt">
<p class="MsoNormal"><font size="2"><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">删除记录</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><o:p>
</o:p>
</span></font></p>
</td>
<td width="194" valign="top" style="width:145.35pt;border-top:none;border-left:
none;border-bottom:solid windowtext .5pt;border-right:solid windowtext .5pt;
mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
padding:0cm 5.4pt 0cm 5.4pt">
<p class="MsoNormal"><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><font size="2">IDC_DELETE<o:p>
</o:p>
</font></span></p>
</td>
<td width="194" valign="top" style="width:145.35pt;border-top:none;border-left:
none;border-bottom:solid windowtext .5pt;border-right:solid windowtext .5pt;
mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
padding:0cm 5.4pt 0cm 5.4pt">
<p class="MsoNormal"><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><font size="2">OnDelete()<o:p>
</o:p>
</font></span></p>
</td>
</tr>
<tr>
<td width="194" valign="top" style="width:145.35pt;border:solid windowtext .5pt;
border-top:none;mso-border-top-alt:solid windowtext .5pt;padding:0cm 5.4pt 0cm 5.4pt">
<p class="MsoNormal"><font size="2"><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">修改记录</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><o:p>
</o:p>
</span></font></p>
</td>
<td width="194" valign="top" style="width:145.35pt;border-top:none;border-left:
none;border-bottom:solid windowtext .5pt;border-right:solid windowtext .5pt;
mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
padding:0cm 5.4pt 0cm 5.4pt">
<p class="MsoNormal"><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><font size="2">IDC_MODIFY<o:p>
</o:p>
</font></span></p>
</td>
<td width="194" valign="top" style="width:145.35pt;border-top:none;border-left:
none;border-bottom:solid windowtext .5pt;border-right:solid windowtext .5pt;
mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
padding:0cm 5.4pt 0cm 5.4pt">
<p class="MsoNormal"><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><font size="2">OnModify()<o:p>
</o:p>
</font></span></p>
</td>
</tr>
<tr>
<td width="194" valign="top" style="width:145.35pt;border:solid windowtext .5pt;
border-top:none;mso-border-top-alt:solid windowtext .5pt;padding:0cm 5.4pt 0cm 5.4pt">
<p class="MsoNormal"><font size="2"><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">查找</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><o:p>
</o:p>
</span></font></p>
</td>
<td width="194" valign="top" style="width:145.35pt;border-top:none;border-left:
none;border-bottom:solid windowtext .5pt;border-right:solid windowtext .5pt;
mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
padding:0cm 5.4pt 0cm 5.4pt">
<p class="MsoNormal"><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><font size="2">IDC_FIND<o:p>
</o:p>
</font></span></p>
</td>
<td width="194" valign="top" style="width:145.35pt;border-top:none;border-left:
none;border-bottom:solid windowtext .5pt;border-right:solid windowtext .5pt;
mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
padding:0cm 5.4pt 0cm 5.4pt">
<p class="MsoNormal"><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><font size="2">OnFind()<o:p>
</o:p>
</font></span></p>
</td>
</tr>
</table>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font LANG="ZH-CN" size="2">四个消息处理函数的代码如下：</font></p>
<blockquote>
<blockquote>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">void
CStudentView::OnAdd()</font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">{</font></p>
<blockquote>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">//
<font LANG="ZH-CN">如果不能打开记录集，则返回</font></font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">if(!m_pSet->IsOpen())
return ;</font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">if(!m_pSet->CanAppend())
return ; // <font LANG="ZH-CN">没有设置任何字段的值。</font></font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">m_pSet->AddNew();
//<font LANG="ZH-CN">增加新记录。</font></font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">UpdateData(TRUE);
//<font LANG="ZH-CN">保存新增加的记录。</font></font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">if(m_pSet->CanUpdate())
m_pSet->Update();</font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">m_pSet->Requery();
//<font LANG="ZH-CN">刷新记录集。</font></font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">m_pSet->MoveLast();
//<font LANG="ZH-CN">移动到新记录。</font></font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">UpdateData(FALSE);
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