id (USHORT)

Slider control identity.

notifycode (USHORT)

Notification code.

The slider control uses these notification codes:

SLN_CHANGE

The slider arm position has changed.
SLN_KILLFOCUS
The slider control is losing the focus.
SLN_SETFOCUS
The slider control is receiving the focus.
SLN_SLIDERTRACK
The slider arm is being dragged, but has not been released.

notifyinfo (ULONG)

Control-specific information.

When the value of the notifycode parameter is SLN_CHANGE or SLN_SLIDERTRACK, this value is the new arm position, expressed as the number of pixels from the home position.

Otherwise, this value is the window handle (HWND) of the slider control.

ulReserved (ULONG)

Reserved value, should be 0.

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