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並前往https://tagmerge.com/question/best-method-for-storing-this-pointer-for-use-in-wndproc

Best method for storing this pointer for use in WndProc

MyWindowClass *wndptr = (MyWindowClass*) GetWindowLongPtr(hwnd, GWL_USERDATA);. Which allows you to do this: wndptr->DoSomething();. Of course, ...

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