Read Me for USBPrivateDataSample 1.2
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October 5, 2006

Demonstrates how to use IOKitLib and IOUSBLib to set up asynchronous callbacks when a USB device is attached to or removed from the system. It also shows how to associate arbitrary data with each device instance.


Sample Requirements
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This sample requires Mac OS X and Xcode 2.2.1 or later to build. The sample runs on Mac OS X 10.2 or later.


About the Sample
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The sample uses the I/O Kit APIs to register for asynchronous notifications (callbacks) when a device with a given vendor and product ID has been plugged in. The notification structure has a refcon field where the sample stores a pointer to a block of memory where information about that device can be kept.

When a device arrives, another callback is registered that will be called when the device is removed.


Using the Sample
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Usage:
USBPrivateDataSample [ vendorID [ productID ] ]

Simply build and run the sample. The desired vendor and product IDs can be specified as command line arguments. Output is sent to the console. 

	
Changes from Previous Versions
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Updated to produce a universal binary. Modernized and incorporated bug fixes.


Feedback and Bug Reports
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Please send all feedback about this sample to 
<http://developer.apple.com/contact/feedback.html>.

Please submit any bug reports about this sample to
<http://developer.apple.com/bugreporter>.