GET_WHEEL_DELTA_WPARAM macro (Windows)

Applies to: desktop apps only

Retrieves the wheel-delta value from the specified WPARAM value.

Syntax

short GET_WHEEL_DELTA_WPARAM(
  WPARAM wParam
);

Parameters

wParam

The value to be converted.

Return value

The return value is the high-order word representing the wheel-delta value. It indicates the distance that the wheel is rotated, expressed in multiples or divisions of WHEEL_DELTA, which is 120. 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.

Requirements

See also

Mouse Input Overview

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Build date: 3/6/2012