IOHIDValue defines a value at a given time from an 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 Accessing Hardware From Applications For definitions of I/O Kit terms used in this documentation, such as matching dictionary, family, and driver, see the overview of I/O Kit terms and concepts in the "Device Access and the I/O Kit" chapter of Accessing Hardware From Applications.
This documentation also assumes you have read Human Interface Device & Force Feedback. Please review documentation before using this reference.
All of the information described in this document is contained in the header file
IOHIDValue found at