PATHHardware Documentation > USB Devices > Mac OS USB DDK API Reference

Receiving A Message From A Child Driver

The USBExpertNotifyParent function allows a child driver to send a message to its parent driver.



 
USBExpertNotifyParent (

                     USBReference reference,

                     void * pointer);

--> reference: The USB reference for the calling child driver.
--> pointer: A pointer to a privately defined message for the parent driver.

If a parent driver has its USBDeviceNotificationCallbackProc called with a kNotifyChildMessage , then the parent driver should interpret the pointer argument as a privately defined message type from the child driver and the refcon argument as the USBReference of that child.

See the Device Notification Parameter Block for details about information passed in the device notification callback.

Previous | Back Up One Level | Next | Show Frames | Hide Frames