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序号：58466 发表者：lvjzh*** 发表日期：2003-11-01 10:43:49
<br>主题：if ((nID &amp; 0xFFF0) == IDM_ABOUTBOX)//?what mean?
<br>内容：&nbsp;&nbsp;&nbsp;&nbsp;if ((nID &amp; 0xFFF0) == IDM_ABOUTBOX)<BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CAboutDlg dlgAbout;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;dlgAbout.DoModal();<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR>代码中的if ((nID &amp; 0xFFF0) == IDM_ABOUTBOX)<BR>是什么意思？请指教谢谢!<BR>
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回复者：CDMA2000 回复日期：2003-11-01 10:54:50
<br>内容：这段代码应该是<BR>OnSysCommand(UINT nID, LPARAM lParam)里面的<BR><BR>In WM_SYSCOMMAND messages, the four low-order bits of the nID parameter are used internally by Windows. When an application tests the value of nID, it must combine the value 0xFFF0 with the nID value by using the bitwise-AND operator to obtain the correct result.<BR><BR>if ((nID &amp; 0xFFF0) == IDM_ABOUTBOX)<BR>是判断用户是否选择了系统菜单的About项<BR><BR>
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回复者：lvjzh*** 回复日期：2003-11-01 10:57:48
<br>内容：你真是高人!<BR>是OnSysCommand(UINT nID, LPARAM lParam)里面的<BR><BR>我还想问的是 nID &amp; 0xFFF0值是从哪知道的<BR>谢谢!
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<font color=red>答案被接受</font><br>回复者：CDMA2000 回复日期：2003-11-01 11:05:24
<br>内容：你应该去看看msdn里对OnSysCommand的解释
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回复者：lvjzh*** 回复日期：2003-11-01 11:08:37
<br>内容：谢谢!
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