window procedure

基本解释

Your window procedure is the event handler.
窗口过程就是事件处理器。
Calls the default window procedure, which provides default processing for any window message that an application does not process.
这个函数调用缺省的窗口过程，提供了对应用程序没有处理的任何窗口消息的缺省处理。
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If you don't have a window or you don't want to process the timer messages in the window procedure, you must pass NULL to the function in place of a window handle.
如果你没有窗口或者是你不想在窗口过程中处理定时器消息，你必须在函数的窗口句柄的地方传递一空值。