HidP_GetButtonCaps function (hidpi.h)
The HidP_GetButtonCaps routine returns a button capability array that describes all the HID control buttons in a top-level collection for a specified type of HID report.
Syntax
NTSTATUS HidP_GetButtonCaps(
[in] HIDP_REPORT_TYPE ReportType,
[out] PHIDP_BUTTON_CAPS ButtonCaps,
[in, out] PUSHORT ButtonCapsLength,
[in] PHIDP_PREPARSED_DATA PreparsedData
);
Parameters
[in] ReportType
Specifies a HIDP_REPORT_TYPE enumerator value that identifies the report type.
[out] ButtonCaps
Pointer to a caller-allocated buffer that the routine uses to return a button capability array for the specified report type.
[in, out] ButtonCapsLength
Specifies the length on input, in array elements, of the buffer provided at ButtonCaps. On output, this parameter is set to the actual number of elements that the routine returns.
[in] PreparsedData
Pointer to a top-level collection's preparsed data.
Return value
HidP_GetButtonCaps returns one of the following status values:
| Return code | Description |
|---|---|
|
The routine successfully returned the capability data. |
|
The preparsed data is not valid. |
Remarks
HidP_GetButtonCaps returns the capability of all buttons in a top level collection for a specified report type.
ButtonCapsLength should be set to the value of the NumberXxxButtonCaps member of the HIDP_CAPS structure returned by HidP_GetCaps, where Xxx specifies the report type.
To obtain a subset of button capabilities, selected by usage, usage page, or link collection, use HidP_GetSpecificButtonCaps.
For more information about a collection's capability, see Obtaining Collection Information.
See also HID Collections.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Available in Windows 2000 and later versions of Windows. |
| Target Platform | Universal |
| Header | hidpi.h (include Hidpi.h) |
| Library | Hidparse.lib |
| IRQL | PASSIVE_LEVEL |