window procedure

基本解釋

Your window procedure is the event handler.
窗口過程就是事件處理器。
Calls the default window procedure, which provides default processing for any window message that an application does not process.
這個函數(shù)調(diào)用缺省的窗口過程，提供了對應(yīng)用程序沒有處理的任何窗口消息的缺省處理。
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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.
如果你沒有窗口或者是你不想在窗口過程中處理定時器消息，你必須在函數(shù)的窗口句柄的地方傳遞一空值。