MouseLowLevelHookStructMouseData Field

If the message is WM_MOUSEWHEEL, the high-order word of this member is the wheel delta. The low-order word is reserved. A positive value indicates that the wheel was rotated forward, away from the user; a negative value indicates that the wheel was rotated backward, toward the user. One wheel click is defined as WHEEL_DELTA, which is 120.

public IntPtr MouseData

Public MouseData As IntPtr

public:
IntPtr MouseData

val mutable MouseData: IntPtr