WM_STYLECHANGING

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.

WM_STYLECHANGING

wStyleType = wParam; // extended or nonextended styles

lpss = (LPSTYLESTRUCT) lParam; // structure containing new styles

Parameters

wStyleType

Value of wParam. Specifies whether the window's extended or nonextended styles have changed. This parameter can be a combination of the following values:

Value	Meaning
GWL_EXSTYLE	The window's extended styles are changing.
GWL_STYLE	The window's nonextended styles are changing.

lpss

Value of lParam. Points to a STYLESTRUCT structure that contains the proposed new styles for the window. An application can examine the styles and, if necessary, change them.

Return Values

An application should return zero if it processes this message.

See Also

STYLESTRUCT, WM_STYLECHANGED

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