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WindowProc
In Win32 application programming, WindowProc (or window procedure) is a user-defined callback function that processes messages sent to a window. This function is specified when an application registers its window class and can be named anything (not necessarily WindowProc).
==Message handling==
The window procedure is responsible for handling all messages that are sent to a window. The function prototype of WindowProc is given by:
LRESULT CALLBACK WindowProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
''hWnd'' is a handle to the window to which the message was sent and ''uMsg'' identifies the actual message. ''wParam'' and ''lParam'' are parameters whose meaning depends on the message. An application should identify the message and take the required action.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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