Preparsed Data
Preparsed data is report descriptor data associated with a top-level collection. User-mode applications or kernel-mode drivers use preparsed data to extract information about specific HID controls without having to obtain and interpret a device's entire report descriptor. A user-mode application obtains a collection's preparsed data by using HidD_GetPreparsedData and a kernel-mode driver uses an IOCTL_HID_GET_COLLECTION_DESCRIPTOR request.
The following HIDClass support routines support extracting and setting button and value data:
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