HidD_SetFeature function (hidsdi.h)

The HidD_SetFeature routine sends a feature report to a top-level collection.

Syntax

BOOLEAN HidD_SetFeature(
  [in] HANDLE HidDeviceObject,
  [in] PVOID  ReportBuffer,
  [in] ULONG  ReportBufferLength
);

Parameters

[in] HidDeviceObject

An open handle to a top-level collection.

[in] ReportBuffer

Pointer to a caller-allocated feature report buffer that the caller uses to specify a HID report ID.

For more information about this parameter, see the Remarks section.

[in] ReportBufferLength

The size of the report buffer in bytes. The report buffer must be large enough to hold the feature report plus one additional byte that specifies a nonzero report ID. If report ID is not used, the ID value is zero.

Return value

If HidD_SetFeature succeeds, it returns TRUE; otherwise, it returns FALSE. Use GetLastError to get extended error information.

Remarks

The correct ReportBufferLength is specified by the FeatureReportByteLength member of a top-level collection's HIDP_CAPS structure returned from HidP_GetCaps call.

Before it calls the HidD_SetFeature routine, the caller must do the following:

• If the top-level collection includes report IDs, the caller must set the first byte of the ReportBuffer parameter to a nonzero report ID.
• If the top-level collection does not include report IDs, the caller must set the first byte of the ReportBuffer parameter to zero.
• The feature report is referenced by the ReportBuffer parameter. Depending on the report ID, the caller prepares the report by calling one of the following functions:
  • HidP_SetData
  • HidP_SetScaledUsageValue
  • HidP_SetUsages
  • HidP_SetUsageValue
  • HidP_SetUsageValueArray

For an example of how to prepare and a HID report and send it to a top-level collection, see the HClient sample application.

Only user-mode applications can call HidD_SetFeature. Kernel-mode drivers can use an IOCTL_HID_SET_FEATURE request.

Requirements

See also

• Sending HID Reports
• Interpreting HID Reports
• HidD_GetFeature
• HidD_GetInputReport
• HidD_SetOutputReport
• HIDP_CAPS
• HidP_GetCaps
• IOCTL_HID_GET_FEATURE
• IOCTL_HID_GET_INPUT_REPORT
• IOCTL_HID_SET_FEATURE
• IOCTL_HID_SET_OUTPUT_REPORT