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The WM_STYLECHANGING message is sent to a window when the SetWindowLong function is about to change one or more of the window's styles.
A window receives this message through its WindowProc function.
LRESULT CALLBACK WindowProc( HWND hwnd, // handle to window UINT uMsg, // WM_STYLECHANGING WPARAM wParam, // window style types LPARAM lParam // new styles (LPSTYLESTRUCT) );
An application should return zero if it processes this message.
For more information on the Windows 95/98 implementation of this message, see Window Management Differences.
Windows NT/2000 or later: Requires Windows NT 3.51 or later. Windows 95/98/Me: Requires Windows 95 or later. Header: Declared in Winuser.h; include Windows.h.
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Notebook exported on Monday, 7 July 2008, 18:56:50 PM Eastern Daylight Time