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19.2.4 Windows功能
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C#高级编程（第3版）【全文连载】
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19.2.4 Windows功能
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2006-10-13 14:41:00
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<h1 id="divCurrentNode" style="color: #b83507; width: 100%; text-align: left; font-size: 12px; padding-left: 2px">当前章节:<a href='100165531.htm'><font color='red'>19.2.4 Windows功能</font></a></h1>
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<div style='float:left;width:49%'>·<a href='100165528.htm'>19.2.1 大小和位置</a></div><div style='float:right;width:49%'>·<a href='100165529.htm'>19.2.2 外观</a></div><div style='float:left;width:49%'>·<a href='100165530.htm'>19.2.3 用户交互操作</a></div><div style='float:right;width:49%'>·<a href='100165532.htm'>19.2.5 杂项功能</a></div><div style='float:left;width:49%'>·<a href='100165533.htm'>19.2.6 类层次结构</a></div><div style='float:right;width:49%'>·<a href='100165534.htm'>19.3 标准控件和组件</a></div></div>
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<div id="text"> <link href="css.css" rel="stylesheet" type="text/css" /><h3 style="MARGIN-TOP: 8.15pt; MARGIN-LEFT: 0cm; MARGIN-RIGHT: 0cm; FTEL: 8.15pt"><span lang="EN-US">19.2.4 Windows</span><span style="FONT-FAMILY: 黑体">功能</span></h3>
<p class="MsoNormal"><span lang="EN-US">System.Windows.Forms</span><span style="FONT-FAMILY: 宋体">命名空间是依赖</span><span lang="EN-US">Windows</span><span style="FONT-FAMILY: 宋体">功能的少数几个命名空间之一。</span><span lang="EN-US">Control</span><span style="FONT-FAMILY: 宋体">类就是一个很好的示例。如果对</span><span lang="EN-US">System.Windows.Forms.dll</span><span style="FONT-FAMILY: 宋体">进行反编译，就会看到一个</span><span lang="EN-US">UnsafeNativeMethods</span><span style="FONT-FAMILY: 宋体">类的引用列表。</span><span lang="EN-US">.NET Framework</span><span style="FONT-FAMILY: 宋体">使用这个类封装所有的标准</span><span lang="EN-US">Win32 API</span><span style="FONT-FAMILY: 宋体">调用。使用与</span><span lang="EN-US">Win32 API</span><span style="FONT-FAMILY: 宋体">的交互操作，标准</span><span lang="EN-US">Windows</span><span style="FONT-FAMILY: 宋体">应用程序的观感就可以通过</span><span lang="EN-US">System.Windows.Forms</span><span style="FONT-FAMILY: 宋体">命名空间获得。</span></p>
<p class="MsoNormal" style="LINE-HEIGHT: 17.6pt"><span style="FONT-FAMILY: 宋体">支持与</span><span lang="EN-US">Windows</span><span style="FONT-FAMILY: 宋体">交互操作的功能包括</span><span lang="EN-US">Handle</span><span style="FONT-FAMILY: 宋体">和</span><span lang="EN-US">IsHandleCreated</span><span style="FONT-FAMILY: 宋体">属性。</span><span lang="EN-US">Handle</span><span style="FONT-FAMILY: 宋体">属性返回一个包含控件</span><span lang="EN-US">HWND(Windows</span><span style="FONT-FAMILY: 宋体">句柄</span><span lang="EN-US">)</span><span style="FONT-FAMILY: 宋体">的</span><span lang="EN-US">IntPtr</span><span style="FONT-FAMILY: 宋体">。窗口句柄是惟一标识窗口的</span><span lang="EN-US">HWND</span><span style="FONT-FAMILY: 宋体">。可以将控件看作是一个窗口，所以它有相应的</span><span lang="EN-US">HWND</span><span style="FONT-FAMILY: 宋体">。可以使用</span><span lang="EN-US">Handle</span><span style="FONT-FAMILY: 宋体">属性调用任意数量的</span><span lang="EN-US">Win32 API</span><span style="FONT-FAMILY: 宋体">调用。</span></p>
<p class="MsoNormal" style="LINE-HEIGHT: 17.6pt"><span style="FONT-FAMILY: 宋体">为了访问</span><span lang="EN-US">Windows</span><span style="FONT-FAMILY: 宋体">消息，可以重写</span><span lang="EN-US">WndProc</span><span style="FONT-FAMILY: 宋体">方法。该方法把一个</span><span lang="EN-US">Message</span><span style="FONT-FAMILY: 宋体">对象作为其参数。</span><span lang="EN-US">Message</span><span style="FONT-FAMILY: 宋体">对象是</span><span lang="EN-US">Windows</span><span style="FONT-FAMILY: 宋体">消息的一个简单封装器。它包含</span><span lang="EN-US">HWnd</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">LParam</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">WParam</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">Msg</span><span style="FONT-FAMILY: 宋体">和</span><span lang="EN-US">Result</span><span style="FONT-FAMILY: 宋体">属性。如果希望由系统处理消息，就必须确保把消息传送给</span><span lang="EN-US">base.WndProc(msg)</span><span style="FONT-FAMILY: 宋体">方法。如果希望自己处理消息，就不需要传送消息。</span></p></div>
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<div style='float:left;width:49%'>·<a href='100165528.htm'>19.2.1 大小和位置</a></div><div style='float:right;width:49%'>·<a href='100165529.htm'>19.2.2 外观</a></div><div style='float:left;width:49%'>·<a href='100165530.htm'>19.2.3 用户交互操作</a></div><div style='float:right;width:49%'>·<a href='100165532.htm'>19.2.5 杂项功能</a></div><div style='float:left;width:49%'>·<a href='100165533.htm'>19.2.6 类层次结构</a></div><div style='float:right;width:49%'>·<a href='100165534.htm'>19.3 标准控件和组件</a></div></div>
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