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<p class="MsoNormal"><font size="2"><span style="mso-bidi-font-size: 10.0pt; font-family: 宋体; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">按下了鼠标的左键，等同于</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">WM_LBUTTON<o:p>
</o:p>
</span></font></p>
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<p class="MsoNormal"><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><font size="2">MK_CONTROL<o:p>
</o:p>
</font></span></p>
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<p class="MsoNormal"><font size="2"><span style="mso-bidi-font-size: 10.0pt; font-family: 宋体; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">按下了键盘上的</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">Ctrl</span><span style="mso-bidi-font-size: 10.0pt; font-family: 宋体; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">键</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><o:p>
</o:p>
</span></font></p>
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<p class="MsoNormal"><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><font size="2">MK_MBUTTON<o:p>
</o:p>
</font></span></p>
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<p class="MsoNormal"><font size="2"><span style="mso-bidi-font-size: 10.0pt; font-family: 宋体; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">按下了鼠标的中键，等同于</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">WM_MBUTTON<o:p>
</o:p>
</span></font></p>
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<p class="MsoNormal"><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><font size="2">MK_SHIFT<o:p>
</o:p>
</font></span></p>
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<p class="MsoNormal"><font size="2"><span style="mso-bidi-font-size: 10.0pt; font-family: 宋体; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">按下了键盘上的</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">Shift</span><span style="mso-bidi-font-size: 10.0pt; font-family: 宋体; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">键</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><o:p>
</o:p>
</span></font></p>
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<p class="MsoNormal"><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><font size="2">MK_RBUTTON<o:p>
</o:p>
</font></span></p>
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<p class="MsoNormal"><font size="2"><span style="mso-bidi-font-size: 10.0pt; font-family: 宋体; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">按下了鼠标的右键，等同于</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">WM_MBUTTON<o:p>
</o:p>
</span></font></p>
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<p class="MsoNormal"><font size="2"> <span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><o:p>
</o:p>
</span></font></p>
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<p class="MsoNormal"><font size="2"> <span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><o:p>
</o:p>
</span></font></p>
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<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">2.
<font LANG="ZH-CN">鼠标消息的处理</font></font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font LANG="ZH-CN" size="2">处理鼠标的一般方法可以从以下的两个程序段给予说明。</font></p>
<blockquote>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font LANG="ZH-CN" size="2">1.
不检测SHIFT键和CTRL键的状态</font></p>
<blockquote>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">case
WM_LBUTTONDOWN: //<font LANG="ZH-CN">鼠标左键被按下</font></font></p>
<font SIZE="1">
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"></font><font LANG="ZH-CN" size="2">…</font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">break;</font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">case
WM_LBUTTONUP: //<font LANG="ZH-CN">鼠标左键被释放</font></font></p>
<font SIZE="1">
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"></font><font LANG="ZH-CN" size="2">…</font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">break;</font></p>
</blockquote>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font LANG="ZH-CN" size="2">2.
检测SHIFT键和CTRL键的状态</font></p>
<blockquote>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font LANG="ZH-CN" size="2">…</font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">case
WM_LBUTTONDOWN: //<font LANG="ZH-CN">鼠标左键被按下</font></font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">if((wParam&MK_CONTROL)&&(wParam&MK_SHIFT))
//SHIFT<font LANG="ZH-CN">键和</font>CTRL<font LANG="ZH-CN">都被按下</font></font></p>
<font SIZE="1">
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"></font><font LANG="ZH-CN" size="2">…</font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">break;</font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">case
WM_LBUTTONUP: //<font LANG="ZH-CN">鼠标左键被释放</font></font></p>
<font SIZE="1">
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"></font><font LANG="ZH-CN" size="2">…</font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">break;</font></p>
</blockquote>
</blockquote>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">3.
<font LANG="ZH-CN">捕捉鼠标</font></font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2"><font LANG="ZH-CN">通常情况下，只有鼠标光标位于某一个窗口的客户区或非客户区时，该窗口的窗口函数才能接收鼠标消息。但是由于鼠标的随机性，难以保证光标始终不离开某一窗口。如果要使某个窗口能不间断地捕获鼠标消息，就必须对鼠标加以捕获，从而使</font>Windows<font LANG="ZH-CN">发送的所有鼠标消息均定向到某一个窗口，而不管鼠标光标位于何处。</font></font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2"><font LANG="ZH-CN">要实现鼠标的捕获，可以使用函数</font>SetCapture<font LANG="ZH-CN">，例如：</font></font></p>
<blockquote>
<blockquote>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2" color="#008000">SetCapture(hWnd);</font></p>
</blockquote>
</blockquote>
<font SIZE="3">
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"></font><font size="2"><font LANG="ZH-CN">此语句的执行将导致</font>Windows向<font LANG="ZH-CN">窗口句柄为</font>hWnd<font LANG="ZH-CN">的窗口发送所有的鼠标消息，此时鼠标光标的坐标仍然相对于客户区左上角，因此此时鼠标位置值有可能为负值。</font></font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2"><font LANG="ZH-CN">一旦某个窗口捕获了鼠标，系统的键盘功能会失效，其它窗口将无法得到鼠标消息，因此，当窗口不再需要捕获鼠标消息时，应及时使用</font><font color="#008000">ReleaseCapture</font><font LANG="ZH-CN">函数将鼠标释放。</font></font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"> </p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">4.
<font LANG="ZH-CN">鼠标应用示例</font></font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2"><font LANG="ZH-CN"><a href="example13-2.htm" target="_blank">【例</a></font><a href="example13-2.htm" target="_blank">13-2<font LANG="ZH-CN">】</font></a><font LANG="ZH-CN">单击鼠标左键并拖动鼠标画出一个矩形框，放开鼠标的左键，填充矩形框。</font></font></p>
<p style="line-height: 100%; text-indent: 0; margin: 0" class="右标题" align="left"> </p>
<hr size="1" color="#008000">
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