다음을 통해 공유

HidP_GetUsageValue (Windows Embedded CE 6.0)

  • 아티클

1/6/2010

This function extracts the data associated with a HID control value that matches selection criteria in a HID report.

Syntax

NTSTATUS HidP_GetUsageValue(
  HIDP_REPORT_TYPE ReportType,
  USAGE UsagePage,
  USHORT LinkCollection,
  USAGE Usage,
  PULONG UsageValue,
  PHIDP_PREPARSED_DATA PreparsedData,
  PCHAR Report,
  ULONG ReportLength
);

Parameters

  • ReportType
    [in] HIDP_REPORT_TYPE enumerator value that identifies the report type.
  • UsagePage
    [in] Usage page of the value.
  • LinkCollection
    [in] Link collection that contains the value. If LinkCollection is nonzero, the function only searches for the usage in this link collection; otherwise, if LinkCollection is zero, the function searches for the usage in the top-level collection associated with PreparsedData.
  • Usage
    [in] Usage of the value.
  • UsageValue
    [out] Pointer to a buffer in which the function returns the value data.
  • PreparsedData
    [in] Pointer to a top-level collection's preparsed data.
  • Report
    [in] Pointer to a report that contains values.
  • ReportLength
    [in] Length, in bytes, of the report located at Report.

Return Value

The following table shows the possible return values.

Value Description

HIDP_STATUS_SUCCESS

The function successfully returned the value data.

HIDP_INVALID_REPORT_LENGTH

Report length is not valid.

HIDP_INVALID_REPORT_TYPE

Specified report type is not valid.

HIDP_STATUS_INCOMPATIBLE_REPORT_ID

Report contains a collection with buttons in the specified usage page, but there are no such usages in the report.

HIDP_STATUS_INVALID_PREPARSED_DATA

Preparsed data is not valid.

HIDP_STATUS_USAGE_NOT_FOUND

Collection does not contain a value in the specified usage page in any report of the specified report type.

Remarks

The terms button and usage are used synonymously.

HidP_GetUsageValue does not sign or scale the value. To extract a signed value, use HidP_GetScaledUsageValue. To manually assign the sign bit, you can determine the position of the sign bit from the information in a value's HIDP_VALUE_CAPS structure.

To extract a usage value array, use HidP_GetUsageValueArray.

Requirements

Header hidpi.h
Library Hidparse_lib.lib
Windows Embedded CE Windows CE .NET 4.2 and later

See Also

Reference

HID Parser Functions
HidP_GetButtons
HidP_GetButtonsEx
HidP_GetCaps
HidP_GetScaledUsageValue
HidP_GetUsages
HidP_GetUsagesEx
HidP_GetUsageValueArray
HIDP_REPORT_TYPE
HIDP_VALUE_CAPS