WM_CLOSE和SC_CLOSE的区别
我只是想知道什么是这两个消息常数之间的差异。覆盖在的WndProc 方法哪一个我应该用，来处理关闭按钮的消息。
I just want to know what is the difference between these two messaging constants. Which one should I use in WndProc method when overriding, to handle close button message.
的 WM_CLOSE 被作为每当窗口被要求关闭，以任何方式窗口消息。
WM_CLOSE is sent as a window message whenever the window is requested to be closed, by any means.
SC_CLOSE 形式发来的的 WM_SYSCOMMAND 消息，当用户presses关闭按钮（或选择关闭从窗口的控制菜单）。
SC_CLOSE is sent as a parameter of a WM_SYSCOMMAND message, when the user presses the Close button (or selects Close from the control menu of the window).
哪一个你听的是哪个动作（S）确定你试图拦截/处理。
Which one you listen for is determined by which action(s) you attempting to intercept/deal with.