// hidpi.h

typedef struct _HIDP_DATA {
  USHORT DataIndex;
  USHORT Reserved;
  union {
    ULONG   RawValue;
    BOOLEAN On;
  };
} HIDP_DATA, *PHIDP_DATA;
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Windows Driver Kit DDI reference (ns-hidpi-_hidp_data)

_HIDP_DATA structure

Description

The HIDP_DATA structure contains information about a HID control's data index and value in a HID report.

Members

`DataIndex`

Specifies the data index of a control.

`Reserved`

Reserved for internal system use only.

`RawValue`

Contains the binary data extracted from a report if the control is a value.

`On`

Specifies, if TRUE and the control is a button, that the button is set to ON (1). Otherwise, if On is FALSE and the control is a button, the button is set to OFF (zero).

Remarks

See Extracting and Setting Control Data by Data Indices.

HIDP_DATA - NtDoc