Sent to a window after the SetWindowLong function has changed one or more of the window's styles.
A window receives this message through its WindowProc function.
Indicates whether the window's styles or extended window styles have changed. This parameter can be one or more of the following values.
The extended window styles have changed.
The window styles have changed.
A pointer to a STYLESTRUCT structure that contains the new styles for the window. An application can examine the styles, but cannot change them.
An application should return zero if it processes this message.
Minimum supported client
|Windows 2000 Professional [desktop apps only]|
Minimum supported server
|Windows 2000 Server [desktop apps only]|