Sets the user data associated with the window. This data is intended for use by the application that created the window. Its value is initially zero. 通过这个可以向指定的窗口中绑定用户自定义数据,通过GetWindowLongPtr(hwnd, GWLP_USERDATA)取出自定义数据。
Raymond Chen states here in The Old New Thing that GWLP_USERDATA "belongs to the window class and not to the code that creates the window". The documentation states here, in GetWindowLongPtrA that GWLP_USERDATA "is intended for use by the application that created the window". Which of the...
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