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I can use Event Tap/CGEventCreateScrollWheelEvent to send scroll event to HID Tap.

But as I keep sending the scroll events and also pressing the control key at the same time,

the expected Zoom in/out does not come.

Is the HID Event tap too high level ? Will IOHIDPostEvent be a better API to send mouse event as modifier key is taken into consideration?

Thank you.

Bill Huang
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