HID Preparsed Data
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8/28/2008
Preparsed data is report-descriptor data associated with a top-level HID collection. Parsed data is data from a HID device after the data has been operated on by the HID parser functions. HID client drivers can use preparsed data to extract information about specific HID controls without having to obtain and interpret the entire report descriptor for a device.
The following table shows the macros and functions that support extracting and setting button and value data.
| Function | Description |
|---|---|
Returns a list of the HID control button usages that are on a specified usage page and are set to On in a HID report. |
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Returns a list of the HID control button usages that are set toOn in a HID report. |
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Returns the signed and scaled result of a HID control value extracted from a HID report. |
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Extracts the data associated with a HID control value that matches selection criteria in a HID report. |
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Extracts the data associated with a HID control usage value array from a HID report. |
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Sets the specified HID control buttons to On in a HID report. |
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Converts a signed and scaled physical number to a HID usage's logical value, and sets the usage value in a specified HID report. |
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Sets a HID control usage value in a specified HID report. |
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Sets a HID control usage value array in a specified HID report. |
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Sets the specified HID control button usages to Off in a HID report. |