IOHIDValue defines a value at a given time from a parsed item (IOHIDElement) contained within a Human Interface Device (HID) object. It is used to obtain either integer or data element values along with scaled values based on physical or calibrated settings. IOHIDValue is a CFType object and as such conforms to all the conventions expected such object.
This documentation assumes that you have a basic understanding of the material contained in Introduction to Accessing Hardware From Applications.
All of the information described in this document is contained in the header file
IOHIDValue found at