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並前往https://forum.powerbasic.com/forum/user-to-user-discussions/programming/19782-get-cbwndextra-s-address

Get cbWndExtra's address - PowerBASIC Forum

Is it %GWL_USERDATA that refers to cbWndExtra ? ------------------ ... Call SetWindowLong(hWnd, GWL_USERDATA, ObjPtr(Me)). Patrice Terrier

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