WM_FOCUSCHANGE - Parameters

hwndFocus (HWND)

Focus window handle.

usSetFocus (USHORT)

Focus flag.

TRUE

The window is receiving the focus and hwndFocus identifies the window losing the focus.
FALSE
The window is losing the focus and hwndFocus identifies the window receiving the focus.

fsFocusChange (USHORT)

Focus changing indicators.

The indicators are passed from the WinFocusChange function.

ulReserved (ULONG)

Reserved value, should be 0.

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