harmony 鸿蒙HID DDK

  • 2025-06-12
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HID DDK

Overview

Provides HID driver development kit (DDK) functions, including those for creating a device, sending events to a device, and destroying a device.

System capability: SystemCapability.Driver.HID.Extension

Since: 11

Summary

Files

Name Description
hid_ddk_api.h Declares the HID DDK functions for accessing an input device from the host.
File to include: <hid/hid_ddk_api.h>
Library: libhid.z.so
hid_ddk_types.h Defines the enum variables and structs used in the HID DDK.
File to include: <hid/hid_ddk_types.h>
Library: libhid.z.so

Structs

Name Description
struct  Hid_EmitItem Defines event information.
struct  Hid_Device Defines basic device information.
struct  Hid_EventTypeArray Defines an array of event types.
struct  Hid_KeyCodeArray Defines an array of key codes.
struct  Hid_AbsAxesArray Defines an array of absolute coordinates.
struct  Hid_RelAxesArray Defines an array of relative coordinates.
struct  Hid_MscEventArray Defines an array of miscellaneous events.
struct  Hid_EventProperties Defines the event properties of a device.
struct  Hid_RawDevInfo Defines the raw device information.

Macros

Name Description
HID_MAX_REPORT_BUFFER_SIZE   (16 * 1024 - 1) Defines the maximum size of the report buffer.

Types

Name Description
typedef struct Hid_EmitItem Hid_EmitItem Defines event information.
typedef struct Hid_Device Hid_Device Defines basic device information.
typedef struct Hid_EventTypeArray Hid_EventTypeArray Defines an array of event types.
typedef struct Hid_KeyCodeArray Hid_KeyCodeArray Defines an array of key codes.
typedef struct Hid_AbsAxesArray Hid_AbsAxesArray Defines an array of absolute coordinates.
typedef struct Hid_RelAxesArray Hid_RelAxesArray Defines an array of relative coordinates.
typedef struct Hid_MscEventArray Hid_MscEventArray Defines an array of miscellaneous events.
typedef struct Hid_EventProperties Hid_EventProperties Defines the event properties of a device.
typedef struct Hid_DeviceHandle Hid_DeviceHandle Defines the opaque USB HID device structure.
typedef struct Hid_RawDevInfo Hid_RawDevInfo Defines the raw device information.

Enums

Name Description
Hid_DeviceProp {
HID_PROP_POINTER = 0x00, HID_PROP_DIRECT = 0x01, HID_PROP_BUTTON_PAD = 0x02, HID_PROP_SEMI_MT = 0x03, HID_PROP_TOP_BUTTON_PAD = 0x04, HID_PROP_POINTING_STICK = 0x05, HID_PROP_ACCELEROMETER = 0x06
}		 Enumerates the properties of input devices.
Hid_EventType {
HID_EV_SYN = 0x00, HID_EV_KEY = 0x01, HID_EV_REL = 0x02, HID_EV_ABS = 0x03, HID_EV_MSC = 0x04
}		 Enumerates the event types.
Hid_SynEvent { HID_SYN_REPORT = 0, HID_SYN_CONFIG = 1, HID_SYN_MT_REPORT = 2, HID_SYN_DROPPED = 3 } Enumerates sync events.
Hid_KeyCode {
HID_KEY_A = 30, HID_KEY_B = 48, HID_KEY_C = 46, HID_KEY_D = 32, HID_KEY_E = 18, HID_KEY_F = 33, HID_KEY_G = 34, HID_KEY_H = 35, HID_KEY_I = 23, HID_KEY_J = 36, HID_KEY_K = 37, HID_KEY_L = 38, HID_KEY_M = 50, HID_KEY_N = 49, HID_KEY_O = 24, HID_KEY_P = 25, HID_KEY_Q = 16, HID_KEY_R = 19, HID_KEY_S = 31, HID_KEY_T = 20, HID_KEY_U = 22, HID_KEY_V = 47, HID_KEY_W = 17, HID_KEY_X = 45, HID_KEY_Y = 21, HID_KEY_Z = 44, HID_KEY_ESC = 1, HID_KEY_0 = 11, HID_KEY_1 = 2, HID_KEY_2 = 3, HID_KEY_3 = 4, HID_KEY_4 = 5, HID_KEY_5 = 6, HID_KEY_6 = 7, HID_KEY_7 = 8, HID_KEY_8 = 9, HID_KEY_9 = 10, HID_KEY_GRAVE = 41, HID_KEY_MINUS = 12, HID_KEY_EQUALS = 13, HID_KEY_BACKSPACE = 14, HID_KEY_LEFT_BRACKET = 26, HID_KEY_RIGHT_BRACKET = 27, HID_KEY_ENTER = 28, HID_KEY_LEFT_SHIFT = 42, HID_KEY_BACKSLASH = 43, HID_KEY_SEMICOLON = 39, HID_KEY_APOSTROPHE = 40, HID_KEY_SPACE = 57, HID_KEY_SLASH = 53, HID_KEY_COMMA = 51, HID_KEY_PERIOD = 52, HID_KEY_RIGHT_SHIFT = 54, HID_KEY_NUMPAD_0 = 82, HID_KEY_NUMPAD_1 = 79, HID_KEY_NUMPAD_2 = 80, HID_KEY_NUMPAD_3 = 81, HID_KEY_NUMPAD_4 = 75, HID_KEY_NUMPAD_5 = 76, HID_KEY_NUMPAD_6 = 77, HID_KEY_NUMPAD_7 = 71, HID_KEY_NUMPAD_8 = 72, HID_KEY_NUMPAD_9 = 73, HID_KEY_NUMPAD_DIVIDE = 70, HID_KEY_NUMPAD_MULTIPLY = 55, HID_KEY_NUMPAD_SUBTRACT = 74, HID_KEY_NUMPAD_ADD = 78, HID_KEY_NUMPAD_DOT = 83, HID_KEY_SYSRQ = 99, HID_KEY_DELETE = 111, HID_KEY_MUTE = 113, HID_KEY_VOLUME_DOWN = 114, HID_KEY_VOLUME_UP = 115, HID_KEY_BRIGHTNESS_DOWN = 224, HID_KEY_BRIGHTNESS_UP = 225, HID_BTN_0 = 0x100, HID_BTN_1 = 0x101, HID_BTN_2 = 0x102, HID_BTN_3 = 0x103, HID_BTN_4 = 0x104, HID_BTN_5 = 0x105, HID_BTN_6 = 0x106, HID_BTN_7 = 0x107, HID_BTN_8 = 0x108, HID_BTN_9 = 0x109, HID_BTN_LEFT = 0x110, HID_BTN_RIGHT = 0x111, HID_BTN_MIDDLE = 0x112, HID_BTN_SIDE = 0x113, HID_BTN_EXTRA = 0x114, HID_BTN_FORWARD = 0x115, HID_BTN_BACKWARD = 0x116, HID_BTN_TASK = 0x117, HID_BTN_TOOL_PEN = 0x140, HID_BTN_TOOL_RUBBER = 0x141, HID_BTN_TOOL_BRUSH = 0x142, HID_BTN_TOOL_PENCIL = 0x143, HID_BTN_TOOL_AIRBRUSH = 0x144, HID_BTN_TOOL_FINGER = 0x145, HID_BTN_TOOL_MOUSE = 0x146, HID_BTN_TOOL_LENS = 0x147, HID_BTN_TOOL_QUINT_TAP = 0x148, HID_BTN_STYLUS3 = 0x149, HID_BTN_TOUCH = 0x14a, HID_BTN_STYLUS = 0x14b, HID_BTN_STYLUS2 = 0x14c, HID_BTN_TOOL_DOUBLE_TAP = 0x14d, HID_BTN_TOOL_TRIPLE_TAP = 0x14e, HID_BTN_TOOL_QUAD_TAP = 0x14f, HID_BTN_WHEEL = 0x150
}		 Enumerates the key codes.
Hid_AbsAxes {
HID_ABS_X = 0x00, HID_ABS_Y = 0x01, HID_ABS_Z = 0x02, HID_ABS_RX = 0x03, HID_ABS_RY = 0x04, HID_ABS_RZ = 0x05, HID_ABS_THROTTLE = 0x06, HID_ABS_RUDDER = 0x07, HID_ABS_WHEEL = 0x08, HID_ABS_GAS = 0x09, HID_ABS_BRAKE = 0x0a, HID_ABS_HAT0X = 0x10, HID_ABS_HAT0Y = 0x11, HID_ABS_HAT1X = 0x12, HID_ABS_HAT1Y = 0x13, HID_ABS_HAT2X = 0x14, HID_ABS_HAT2Y = 0x15, HID_ABS_HAT3X = 0x16, HID_ABS_HAT3Y = 0x17, HID_ABS_PRESSURE = 0x18, HID_ABS_DISTANCE = 0x19, HID_ABS_TILT_X = 0x1a, HID_ABS_TILT_Y = 0x1b, HID_ABS_TOOL_WIDTH = 0x1c, HID_ABS_VOLUME = 0x20, HID_ABS_MISC = 0x28
}		 Enumerates the absolute coordinates.
Hid_RelAxes {
HID_REL_X = 0x00, HID_REL_Y = 0x01, HID_REL_Z = 0x02, HID_REL_RX = 0x03, HID_REL_RY = 0x04, HID_REL_RZ = 0x05, HID_REL_HWHEEL = 0x06, HID_REL_DIAL = 0x07, HID_REL_WHEEL = 0x08, HID_REL_MISC = 0x09, HID_REL_RESERVED = 0x0a, HID_REL_WHEEL_HI_RES = 0x0b, HID_REL_HWHEEL_HI_RES = 0x0c
}		 Enumerates the relative coordinates.
Hid_MscEvent {
HID_MSC_SERIAL = 0x00, HID_MSC_PULSE_LED = 0x01, HID_MSC_GESTURE = 0x02, HID_MSC_RAW = 0x03, HID_MSC_SCAN = 0x04, HID_MSC_TIMESTAMP = 0x05
}		 Enumerates miscellaneous input events.
Hid_DdkErrCode {
HID_DDK_SUCCESS = 0, HID_DDK_NO_PERM = 201, HID_DDK_INVALID_PARAMETER = 401, HID_DDK_FAILURE = 27300001, HID_DDK_NULL_PTR = 27300002, HID_DDK_INVALID_OPERATION = 27300003, HID_DDK_TIMEOUT = 27300004, HID_DDK_INIT_ERROR = 27300005, HID_DDK_SERVICE_ERROR = 27300006, HID_DDK_MEMORY_ERROR = 27300007, HID_DDK_IO_ERROR = 27300008, HID_DDK_DEVICE_NOT_FOUND = 27300009
}		 Enumerates the HID DDK error codes.
Hid_ReportType { HID_INPUT_REPORT = 0, HID_OUTPUT_REPORT = 1, HID_FEATURE_REPORT = 2 } Defines the report (data packets exchanged between the HID device and the host) type.

Functions

Name Description
int32_t OH_Hid_CreateDevice (Hid_Device *hidDevice, Hid_EventProperties *hidEventProperties) Creates a device.
int32_t OH_Hid_EmitEvent (int32_t deviceId, const Hid_EmitItem items[], uint16_t length) Sends an event list to a device.
int32_t OH_Hid_DestroyDevice (int32_t deviceId) Destroys a device.
int32_t OH_Hid_Init (void) Initializes an HID DDK.
int32_t OH_Hid_Release (void) Releases an HID DDK.
int32_t OH_Hid_Open (uint64_t deviceId, uint8_t interfaceIndex, Hid_DeviceHandle **dev) Opens the device specified by deviceId and interfaceIndex.
int32_t OH_Hid_Close (Hid_DeviceHandle **dev) Closes an HID device.
int32_t OH_Hid_Write (Hid_DeviceHandle *dev, uint8_t *data, uint32_t length, uint32_t *bytesWritten) Writes reports to an HID device.
int32_t OH_Hid_ReadTimeout (Hid_DeviceHandle *dev, uint8_t *data, uint32_t bufSize, int timeout, uint32_t *bytesRead) Reads reports from the HID device within the specified timeout interval.
int32_t OH_Hid_Read (Hid_DeviceHandle *dev, uint8_t *data, uint32_t bufSize, uint32_t *bytesRead) Reads reports from the HID device. The blocking mode (that is, blocking remains active until data can be read) is used by default. You can call OH_Hid_SetNonBlocking to change the mode.
int32_t OH_Hid_SetNonBlocking (Hid_DeviceHandle *dev, int nonBlock) Sets the device read mode to non-blocking mode.
int32_t OH_Hid_GetRawInfo (Hid_DeviceHandle *dev, Hid_RawDevInfo *rawDevInfo) Obtains the original device information.
int32_t OH_Hid_GetRawName (Hid_DeviceHandle *dev, char *data, uint32_t bufSize) Obtains the original device name.
int32_t OH_Hid_GetPhysicalAddress (Hid_DeviceHandle *dev, char *data, uint32_t bufSize) Obtains the physical address of the HID device.
int32_t OH_Hid_GetRawUniqueId (Hid_DeviceHandle *dev, uint8_t *data, uint32_t bufSize) Obtains the original unique identifier of a device.
int32_t OH_Hid_SendReport (Hid_DeviceHandle *dev, Hid_ReportType reportType, const uint8_t *data, uint32_t length) Sends reports to the HID device.
int32_t OH_Hid_GetReport (Hid_DeviceHandle *dev, Hid_ReportType reportType, uint8_t *data, uint32_t bufSize) Obtains reports from the HID device.
int32_t OH_Hid_GetReportDescriptor (Hid_DeviceHandle *dev, uint8_t *buf, uint32_t bufSize, uint32_t *bytesRead) Obtains the report descriptor of the HID device.

Variables

Name Description
uint16_t Hid_EmitItem::type Enumerates the event types.
uint16_t Hid_EmitItem::code Event code.
uint32_t Hid_EmitItem::value Event value.
const char * Hid_Device::deviceName Device name.
uint16_t Hid_Device::vendorId Vendor ID.
uint16_t Hid_Device::productId Product ID.
uint16_t Hid_Device::version Version.
uint16_t Hid_Device::bustype Bus type.
Hid_DeviceProp * Hid_Device::properties Device properties.
uint16_t Hid_Device::propLength Number of device properties.
Hid_EventType * Hid_EventTypeArray::hidEventType Event type.
uint16_t Hid_EventTypeArray::length Size of the array.
Hid_KeyCode * Hid_KeyCodeArray::hidKeyCode Enumerates the key codes.
uint16_t Hid_KeyCodeArray::length Size of the array.
Hid_AbsAxes * Hid_AbsAxesArray::hidAbsAxes Array of absolute coordinates.
uint16_t Hid_AbsAxesArray::length Size of the array.
Hid_RelAxes * Hid_RelAxesArray::hidRelAxes Relative coordinate.
uint16_t Hid_RelAxesArray::length Size of the array.
Hid_MscEvent * Hid_MscEventArray::hidMscEvent Miscellaneous event.
uint16_t Hid_MscEventArray::length Size of the array.
struct Hid_EventTypeArrayHid_EventProperties::hidEventTypes Array of event types.
struct Hid_KeyCodeArrayHid_EventProperties::hidKeys Array of key codes.
struct Hid_AbsAxesArrayHid_EventProperties::hidAbs Array of absolute coordinates.
struct Hid_RelAxesArrayHid_EventProperties::hidRelBits Array of relative coordinates.
struct Hid_MscEventArrayHid_EventProperties::hidMiscellaneous Array of miscellaneous events.
int32_t Hid_EventProperties::hidAbsMax [64] Maximum values of the absolute coordinates.
int32_t Hid_EventProperties::hidAbsMin [64] Minimum values of the absolute coordinates.
int32_t Hid_EventProperties::hidAbsFuzz [64] Fuzzy values of the absolute coordinates.
int32_t Hid_EventProperties::hidAbsFlat [64] Fixed values of the absolute coordinates.
uint32_t Hid_RawDevInfo::busType Bus type.
uint16_t Hid_RawDevInfo::vendor Provider ID.
uint16_t Hid_RawDevInfo::product Product ID.

Macro Description

HID_MAX_REPORT_BUFFER_SIZE

#define HID_MAX_REPORT_BUFFER_SIZE   (16 * 1024 - 1)

Description

Defines the maximum size of the report buffer.

Since: 18

Type Description

Hid_AbsAxesArray

typedef struct Hid_AbsAxesArray Hid_AbsAxesArray

Description

Defines a struct for an array of absolute coordinates.

Since: 11

Hid_Device

typedef struct Hid_Device Hid_Device

Description

Defines a struct for basic device information.

Since: 11

Hid_DeviceHandle

typedef struct Hid_DeviceHandle Hid_DeviceHandle

Description

Defines the opaque USB HID device structure.

Since: 18

Hid_EmitItem

typedef struct Hid_EmitItem Hid_EmitItem

Description

Defines a struct for event information.

Since: 11

Hid_EventProperties

typedef struct Hid_EventProperties Hid_EventProperties

Description

Defines a struct for the event properties of a device.

Since: 11

Hid_EventTypeArray

typedef struct Hid_EventTypeArray Hid_EventTypeArray

Description

Defines a struct for an array of event types.

Since: 11

Hid_KeyCodeArray

typedef struct Hid_KeyCodeArray Hid_KeyCodeArray

Description

Defines a struct for an array of key codes.

Since: 11

Hid_MscEventArray

typedef struct Hid_MscEventArray Hid_MscEventArray

Description

Defines a struct for an array of miscellaneous events.

Since: 11

Hid_RawDevInfo

typedef struct Hid_RawDevInfo Hid_RawDevInfo

Description

Defines the raw device information.

Since: 18

Hid_RelAxesArray

typedef struct Hid_RelAxesArray Hid_RelAxesArray

Description

Defines a struct for an array of relative coordinates.

Since: 11

Enum Description

Hid_AbsAxes

enum Hid_AbsAxes

Description

Enumerates the absolute coordinates.

Since: 11

Value Description
HID_ABS_X X axis.
HID_ABS_Y Y axis.
HID_ABS_Z Z axis.
HID_ABS_RX X axis of the right analog stick.
HID_ABS_RY Y axis of the right analog stick.
HID_ABS_RZ Z axis of the right analog stick.
HID_ABS_THROTTLE Throttle.
HID_ABS_RUDDER Rudder.
HID_ABS_WHEEL Scroll wheel.
HID_ABS_GAS Gas.
HID_ABS_BRAKE Brake.
HID_ABS_HAT0X HAT0X.
HID_ABS_HAT0Y HAT0Y.
HID_ABS_HAT1X HAT1X.
HID_ABS_HAT1Y HAT1Y.
HID_ABS_HAT2X HAT2X.
HID_ABS_HAT2Y HAT2Y.
HID_ABS_HAT3X HAT3X.
HID_ABS_HAT3Y HAT3Y.
HID_ABS_PRESSURE Pressure.
HID_ABS_DISTANCE Distance.
HID_ABS_TILT_X Tilt of X axis.
HID_ABS_TILT_Y Tilt of Y axis.
HID_ABS_TOOL_WIDTH Width of the touch tool.
HID_ABS_VOLUME Volume.
HID_ABS_MISC Others.

Hid_DdkErrCode

enum Hid_DdkErrCode

Description

Enumerates the HID DDK error codes.

Since: 11

Value Description
HID_DDK_SUCCESS Operation succeeded.
HID_DDK_NO_PERM No permission. The value is changed from -6 to 201 since API version 16.
HID_DDK_INVALID_PARAMETER Invalid parameter. The value is changed from -2 to 401 since API version 16.
HID_DDK_FAILURE Operation failed. The value is changed from -1 to 27300001 since API version 16.
HID_DDK_NULL_PTR Null pointer. The value is changed from -4 to 27300002 since API version 16.
HID_DDK_INVALID_OPERATION Invalid operation. The value is changed from -3 to 27300003 since API version 16.
HID_DDK_TIMEOUT Timeout. The value is changed from -5 to 27300004 since API version 16.
HID_DDK_INIT_ERROR DDK initialization error. This enum is supported since API version 16.
HID_DDK_SERVICE_ERROR Service communication error. This enum is supported since API version 16.
HID_DDK_MEMORY_ERROR Memory-related errors, such as memory data copy failure and memory allocation failure. This enum is supported since API version 16.
HID_DDK_IO_ERROR I/O operation failure. This enum is supported since API version 16.
HID_DDK_DEVICE_NOT_FOUND Device not found. This enum is supported since API version 16.

Hid_DeviceProp

enum Hid_DeviceProp

Description

Enumerates the properties of input devices.

Since: 11

Value Description
HID_PROP_POINTER Pointer device.
HID_PROP_DIRECT Direct input device.
HID_PROP_BUTTON_PAD Touch device with bottom keys.
HID_PROP_SEMI_MT Full multi-touch device.
HID_PROP_TOP_BUTTON_PAD Touch device with top soft keys.
HID_PROP_POINTING_STICK Pointing stick.
HID_PROP_ACCELEROMETER Accelerometer.

Hid_EventType

enum Hid_EventType

Description

Enumerates the event types.

Since: 11

Value Description
HID_EV_SYN Sync event.
HID_EV_KEY Key event.
HID_EV_REL Relative coordinate event.
HID_EV_ABS Absolute coordinate event.
HID_EV_MSC Miscellaneous event.

Hid_KeyCode

enum Hid_KeyCode

Description

Enumerates the key codes.

Since: 11

Value Description
HID_KEY_A Key A
HID_KEY_B Key B
HID_KEY_C Key C
HID_KEY_D Key D
HID_KEY_E Key E
HID_KEY_F Key F
HID_KEY_G Key G
HID_KEY_H Key H
HID_KEY_I Key I
HID_KEY_J Key J
HID_KEY_K Key K
HID_KEY_L Key L
HID_KEY_M Key M
HID_KEY_N Key N
HID_KEY_O Key O
HID_KEY_P Key P
HID_KEY_Q Key Q
HID_KEY_R Key R
HID_KEY_S Key S
HID_KEY_T Key T
HID_KEY_U Key U
HID_KEY_V Key V
HID_KEY_W Key W
HID_KEY_X Key X
HID_KEY_Y Key Y
HID_KEY_Z Key Z
HID_KEY_ESC Key Esc
HID_KEY_0 Key 0
HID_KEY_1 Key 1
HID_KEY_2 Key 2
HID_KEY_3 Key 3
HID_KEY_4 Key 4
HID_KEY_5 Key 5
HID_KEY_6 Key 6
HID_KEY_7 Key 7
HID_KEY_8 Key 8
HID_KEY_9 Key 9
HID_KEY_GRAVE Key `
HID_KEY_MINUS Key -
HID_KEY_EQUALS Key =
HID_KEY_BACKSPACE key Backspace
HID_KEY_LEFT_BRACKET Key [
HID_KEY_RIGHT_BRACKET Key ]
HID_KEY_ENTER Key Enter
HID_KEY_LEFT_SHIFT Left Shift
HID_KEY_BACKSLASH Key |
HID_KEY_SEMICOLON Key ;
HID_KEY_APOSTROPHE Key ‘
HID_KEY_SPACE Key Space
HID_KEY_SLASH Key /
HID_KEY_COMMA Key ,
HID_KEY_PERIOD Key .
HID_KEY_RIGHT_SHIFT Right Shift
HID_KEY_NUMPAD_0 Numeral 0 on the numeric keypad
HID_KEY_NUMPAD_1 Numeral 1 on the numeric keypad
HID_KEY_NUMPAD_2 Numeral 2 on the numeric keypad
HID_KEY_NUMPAD_3 Numeral 3 on the numeric keypad
HID_KEY_NUMPAD_4 Numeral 4 on the numeric keypad
HID_KEY_NUMPAD_5 Numeral 5 on the numeric keypad
HID_KEY_NUMPAD_6 Numeral 6 on the numeric keypad
HID_KEY_NUMPAD_7 Numeral 7 on the numeric keypad
HID_KEY_NUMPAD_8 Numeral 8 on the numeric keypad
HID_KEY_NUMPAD_9 Numeral 9 on the numeric keypad
HID_KEY_NUMPAD_DIVIDE Key / on the numeric keypad
HID_KEY_NUMPAD_MULTIPLY Key * on the numeric keypad
HID_KEY_NUMPAD_SUBTRACT Key - on the numeric keypad
HID_KEY_NUMPAD_ADD Key + on the numeric keypad
HID_KEY_NUMPAD_DOT Key . on the numeric keypad
HID_KEY_SYSRQ SYSRQ key
HID_KEY_DELETE Delete key
HID_KEY_MUTE Mute key
HID_KEY_VOLUME_DOWN Volume Down key
HID_KEY_VOLUME_UP Volume Down key
HID_KEY_BRIGHTNESS_DOWN Brightness Down key
HID_KEY_BRIGHTNESS_UP Brightness Up key
HID_BTN_0 Button 0
HID_BTN_1 Button 1
HID_BTN_2 Button 2
HID_BTN_3 Button 3
HID_BTN_4 Button 4
HID_BTN_5 Button 5
HID_BTN_6 Button 6
HID_BTN_7 Button 7
HID_BTN_8 Button 8
HID_BTN_9 Button 9
HID_BTN_LEFT Left mouse button
HID_BTN_RIGHT Right mouse button
HID_BTN_MIDDLE Middle mouse button
HID_BTN_SIDE Side mouse button
HID_BTN_EXTRA Extra mouse button
HID_BTN_FORWARD Mouse forward button
HID_BTN_BACKWARD Mouse backward button
HID_BTN_TASK Mouse task button
HID_BTN_TOOL_PEN Pen
HID_BTN_TOOL_RUBBER Rubber
HID_BTN_TOOL_BRUSH Brush
HID_BTN_TOOL_PENCIL Pencil
HID_BTN_TOOL_AIRBRUSH Air brush
HID_BTN_TOOL_FINGER Finger
HID_BTN_TOOL_MOUSE Mouse
HID_BTN_TOOL_LENS Lens
HID_BTN_TOOL_QUINT_TAP Five-finger touch
HID_BTN_STYLUS3 Stylus 3
HID_BTN_TOUCH Touch
HID_BTN_STYLUS Stylus
HID_BTN_STYLUS2 Stylus 2
HID_BTN_TOOL_DOUBLE_TAP Two-finger touch
HID_BTN_TOOL_TRIPLE_TAP Three-finger touch
HID_BTN_TOOL_QUAD_TAP Four-finger touch
HID_BTN_WHEEL Scroll wheel

Hid_MscEvent

enum Hid_MscEvent

Description

Enumerates miscellaneous input events.

Since: 11

Value Description
HID_MSC_SERIAL Serial number
HID_MSC_PULSE_LED Pulse
HID_MSC_GESTURE Gesture
HID_MSC_RAW Start event
HID_MSC_SCAN Scan
HID_MSC_TIMESTAMP Timestamp

Hid_RelAxes

enum Hid_RelAxes

Description

Enumerates the relative coordinates.

Since: 11

Value Description
HID_REL_X X axis.
HID_REL_Y Y axis.
HID_REL_Z Z axis
HID_REL_RX X axis of the right analog stick
HID_REL_RY Y axis of the right analog stick
HID_REL_RZ Z axis of the right analog stick
HID_REL_HWHEEL Horizontal scroll wheel
HID_REL_DIAL Scale
HID_REL_WHEEL Scroll wheel
HID_REL_MISC Others
HID_REL_RESERVED Reserved
HID_REL_WHEEL_HI_RES High-resolution scroll wheel
HID_REL_HWHEEL_HI_RES High-resolution horizontal scroll wheel

Hid_ReportType

enum Hid_ReportType

Description

Defines the report (data packets exchanged between the HID device and the host) type.

Since: 18

Value Description
HID_INPUT_REPORT Input report.
HID_OUTPUT_REPORT Output report.
HID_FEATURE_REPORT Feature report.

Hid_SynEvent

enum Hid_SynEvent

Description

Enumerates sync events.

Since: 11

Value Description
HID_SYN_REPORT End of an event.
HID_SYN_CONFIG Configuration synchronization.
HID_SYN_MT_REPORT End of a multi-touch ABS data packet.
HID_SYN_DROPPED Event discarded.

Function Description

OH_Hid_Close()

int32_t OH_Hid_Close (Hid_DeviceHandle ** dev)

Description

Closes an HID device.

Since: 18

Parameters

Name Description
dev Device operation handle.

Required Permissions

ohos.permission.ACCESS_DDK_HID

Returns

  • HID_DDK_SUCCESS: Operation succeeded.

  • HID_DDK_NO_PERM: Permission verification failed.

  • HID_DDK_INIT_ERROR DDK: DDK initialization error.

  • HID_DDK_SERVICE_ERROR: DDK service communication error.

  • HID_DDK_IO_ERROR: I/O operation error.

  • HID_DDK_INVALID_PARAMETER: Empty dev.

OH_Hid_CreateDevice()

int32_t OH_Hid_CreateDevice (Hid_Device * hidDevice, Hid_EventProperties * hidEventProperties)

Description

Creates a device.

Since: 11

Parameters

Name Description
hidDevice Pointer to the basic information about the device to create, including the device name, vendor ID, and product ID.
hidEventProperties Pointer to the event properties related to the device to create, including the event type, key event properties, absolute coordinate event properties, and relative coordinate event properties.

Required Permissions

ohos.permission.ACCESS_DDK_HID

Returns

  • deviceID (a non-negative number) if the API call is successful.

  • HID_DDK_NO_PERM: Permission verification failed.

  • HID_DDK_INVALID_OPERATION: hid_ddk service connection failed.

  • HID_DDK_INVALID_PARAMETER: Parameter verification failed. Possible causes: 1. The input hidDevice is a null pointer. 2. The input hidEventProperties is a null pointer. 3. The length of properties exceeds 7 characters. 4. The length of hidEventTypes exceeds 5 characters. 5. The length of hidKeys exceeds 100 characters. 6. The length of hidAbs exceeds 26 characters. 7. The length of hidRelBits exceeds 13 characters. 8. The length of hidMiscellaneous exceeds 6 characters.

  • HID_DDK_FAILURE: Number of devices exceeding the maximum value (200).

OH_Hid_DestroyDevice()

int32_t OH_Hid_DestroyDevice (int32_t deviceId)

Description

Destroys a device.

Since: 11

Parameters

Name Description
deviceId Device ID.

Required Permissions

ohos.permission.ACCESS_DDK_HID

Returns

  • HID_DDK_SUCCESS: Operation succeeded.

  • HID_DDK_NO_PERM: Permission verification failed.

  • HID_DDK_INVALID_OPERATION: Invalid operation. The hid_ddk service connection fails or the caller is not the device creator.

  • HID_DDK_FAILURE: Device not exist.

OH_Hid_EmitEvent()

int32_t OH_Hid_EmitEvent (int32_t deviceId, const Hid_EmitItem items[], uint16_t length)

Description

Sends an event list to a device.

Since: 11

Parameters

Name Description
deviceId Device ID.
items List of the events to send. The event information includes the event type (Hid_EventType), code (Hid_SynEvent, Hid_KeyCode, HidBtnCode, Hid_AbsAxes, Hid_RelAxes, or Hid_MscEvent), and value (depending on the actual device input).
length Length of the event list (number of events to be sent at a time).

Required Permissions

ohos.permission.ACCESS_DDK_HID

Returns

  • HID_DDK_SUCCESS: Operation succeeded.

  • HID_DDK_NO_PERM: Permission verification failed.

  • HID_DDK_INVALID_OPERATION: Invalid operation. The hid_ddk service connection fails or the caller is not the device creator.

  • HID_DDK_INVALID_PARAMETER: Parameter verification failed. Possible causes: 1. The device ID is smaller than 0. 2. The length of the input parameter exceeds 7 characters. 3. The input items is a null pointer.

  • HID_DDK_NULL_PTR: Null pointer. The input device is empty.

  • HID_DDK_FAILURE: Device not exist.

OH_Hid_GetPhysicalAddress()

int32_t OH_Hid_GetPhysicalAddress (Hid_DeviceHandle * dev, char * data, uint32_t bufSize)

Description

Obtains the physical address of the HID device.

Since: 18

Parameters

Name Description
dev Device operation handle.
data Buffer for storing the read data.
bufSize Size of the buffer for storing read data. The value cannot exceed HID_MAX_REPORT_BUFFER_SIZE.

Required Permissions

ohos.permission.ACCESS_DDK_HID

Returns

  • HID_DDK_SUCCESS: Operation succeeded.

  • HID_DDK_NO_PERM: Permission verification failed.

  • HID_DDK_INVALID_PARAMETER: Parameter verification failed. Possible causes: 1. dev is empty. 2. data is empty. 3. The value of bufSize is 0. 4. The value of bufSize exceeds HID_MAX_REPORT_BUFFER_SIZE. HID_DDK_INIT_ERROR DDK: DDK initialization error.

  • HID_DDK_SERVICE_ERROR: DDK service communication error.

  • HID_DDK_MEMORY_ERROR: Memory data copy error.

  • HID_DDK_IO_ERROR: I/O operation error.

  • HID_DDK_INVALID_OPERATION: Invalid operation.

OH_Hid_GetRawInfo()

int32_t OH_Hid_GetRawInfo (Hid_DeviceHandle * dev, Hid_RawDevInfo * rawDevInfo)

Description

Obtains the original device information.

Since: 18

Parameters

Name Description
dev Device operation handle.
rawDevInfo Original device information, including the vendor ID, product ID, and bus type.

Required Permissions

ohos.permission.ACCESS_DDK_HID

Returns

  • HID_DDK_SUCCESS: Operation succeeded.

  • HID_DDK_NO_PERM: Permission verification failed.

  • HID_DDK_INVALID_PARAMETER: Parameter verification failed. Possible causes: 1. dev is empty. 2. rawDevInfo is empty.

  • HID_DDK_INIT_ERROR DDK: DDK initialization error.

  • HID_DDK_SERVICE_ERROR: DDK service communication error.

  • HID_DDK_IO_ERROR: I/O operation error.

  • HID_DDK_INVALID_OPERATION: Invalid operation.

OH_Hid_GetRawName()

int32_t OH_Hid_GetRawName (Hid_DeviceHandle * dev, char * data, uint32_t bufSize)

Description

Obtains the original device name.

Since: 18

Parameters

Name Description
dev Device operation handle.
data Buffer for storing the read data.
bufSize Size of the buffer for storing read data. The value cannot exceed HID_MAX_REPORT_BUFFER_SIZE.

Required Permissions

ohos.permission.ACCESS_DDK_HID

Returns

  • HID_DDK_SUCCESS: Operation succeeded.

  • HID_DDK_NO_PERM: Permission verification failed.

  • HID_DDK_INVALID_PARAMETER: Parameter verification failed. Possible causes: 1. dev is empty. 2. data is empty. 3. The value of bufSize is 0. 4. The value of bufSize exceeds HID_MAX_REPORT_BUFFER_SIZE. HID_DDK_INIT_ERROR DDK: DDK initialization error.

  • HID_DDK_SERVICE_ERROR: DDK service communication error.

  • HID_DDK_MEMORY_ERROR: Memory data copy error.

  • HID_DDK_IO_ERROR: I/O operation error.

  • HID_DDK_INVALID_OPERATION: Invalid operation.

OH_Hid_GetRawUniqueId()

int32_t OH_Hid_GetRawUniqueId (Hid_DeviceHandle * dev, uint8_t * data, uint32_t bufSize)

Description

Obtains the original unique identifier of a device.

Since: 18

Parameters

Name Description
dev Device operation handle.
data Buffer for storing the read data.
bufSize Size of the buffer for storing read data. The value cannot exceed HID_MAX_REPORT_BUFFER_SIZE.

Required Permissions

ohos.permission.ACCESS_DDK_HID

Returns

  • HID_DDK_SUCCESS: Operation succeeded.

  • HID_DDK_NO_PERM: Permission verification failed.

  • HID_DDK_INVALID_PARAMETER: Parameter verification failed. Possible causes: 1. dev is empty. 2. data is empty. 3. The value of bufSize is 0. 4. The value of bufSize exceeds HID_MAX_REPORT_BUFFER_SIZE. HID_DDK_INIT_ERROR DDK: DDK initialization error.

  • HID_DDK_SERVICE_ERROR: DDK service communication error.

  • HID_DDK_MEMORY_ERROR: Memory data copy error.

  • HID_DDK_IO_ERROR: I/O operation error.

  • HID_DDK_INVALID_OPERATION: Invalid operation.

OH_Hid_GetReport()

int32_t OH_Hid_GetReport (Hid_DeviceHandle * dev, Hid_ReportType reportType, uint8_t * data, uint32_t bufSize)

Description

Obtains reports from the HID device.

Since: 18

Parameters

Name Description
dev Device operation handle.
reportType Report type.
data Buffer for storing the read data.
bufSize Size of the buffer for storing read data. The value cannot exceed HID_MAX_REPORT_BUFFER_SIZE.

Required Permissions

ohos.permission.ACCESS_DDK_HID

Returns

  • HID_DDK_SUCCESS: Operation succeeded.

  • HID_DDK_NO_PERM: Permission verification failed.

  • HID_DDK_INVALID_PARAMETER: Parameter verification failed. Possible causes: 1. dev is empty. 2. data is empty. 3. The value of bufSize is 0. 4. The value of bufSize exceeds HID_MAX_REPORT_BUFFER_SIZE.

  • HID_DDK_INIT_ERROR DDK: DDK initialization error.

  • HID_DDK_SERVICE_ERROR: DDK service communication error.

  • HID_DDK_MEMORY_ERROR: Memory data copy error.

  • HID_DDK_IO_ERROR: I/O operation error.

  • HID_DDK_INVALID_OPERATION: Invalid operation.

OH_Hid_GetReportDescriptor()

int32_t OH_Hid_GetReportDescriptor (Hid_DeviceHandle * dev, uint8_t * buf, uint32_t bufSize, uint32_t * bytesRead)

Description

Obtains the report descriptor of the HID device.

Since: 18

Parameters

Name Description
dev Device operation handle.
buf Buffer for storing descriptors.
bufSize Size of the buffer, in bytes. The value cannot exceed HID_MAX_REPORT_BUFFER_SIZE.
bytesRead Number of bytes to read.

Required Permissions

ohos.permission.ACCESS_DDK_HID

Returns

  • HID_DDK_SUCCESS: Operation succeeded.

  • HID_DDK_NO_PERM: Permission verification failed.

  • HID_DDK_INVALID_PARAMETER: Parameter verification failed. Possible causes: 1. dev is empty. 2. buf is empty. 3. The value of bufSize is 0. 4. The value of bufSize exceeds that of HID_MAX_REPORT_BUFFER_SIZE. 5. bytesRead is empty.

  • HID_DDK_INIT_ERROR DDK: DDK initialization error.

  • HID_DDK_SERVICE_ERROR: DDK service communication error.

  • HID_DDK_MEMORY_ERROR: Memory data copy error.

  • HID_DDK_IO_ERROR: I/O operation error.

  • HID_DDK_INVALID_OPERATION: Invalid operation.

OH_Hid_Init()

int32_t OH_Hid_Init (void)

Description

Initializes an HID DDK.

Since: 18

Required Permissions

ohos.permission.ACCESS_DDK_HID

Returns

  • HID_DDK_SUCCESS: Operation succeeded.

  • HID_DDK_NO_PERM: Permission verification failed.

  • HID_DDK_INIT_ERROR: DDK initialization error.

  • HID_DDK_SERVICE_ERROR: DDK service communication error.

OH_Hid_Open()

int32_t OH_Hid_Open (uint64_t deviceId, uint8_t interfaceIndex, Hid_DeviceHandle ** dev)

Description

Opens the device specified by deviceId and interfaceIndex.

Since: 18

Parameters

Name Description
deviceId Device ID.
interfaceIndex Interface index for the API of the HID device.
dev Device operation handle.

Required Permissions

ohos.permission.ACCESS_DDK_HID

Returns

  • HID_DDK_SUCCESS: Operation succeeded.

  • HID_DDK_NO_PERM: Permission verification failed.

  • HID_DDK_INIT_ERROR DDK: DDK initialization error.

  • HID_DDK_SERVICE_ERROR: DDK service communication error.

  • HID_DDK_MEMORY_ERROR: dev memory application error.

  • HID_DDK_IO_ERROR: I/O operation error.

  • HID_DDK_INVALID_PARAMETER: Empty dev.

  • HID_DDK_DEVICE_NOT_FOUND: Device not found based on the specified deviceId and interfaceIndex.

OH_Hid_Read()

int32_t OH_Hid_Read (Hid_DeviceHandle * dev, uint8_t * data, uint32_t bufSize, uint32_t * bytesRead)

Description

Reads reports from the HID device. The blocking mode (that is, blocking remains active until data can be read) is used by default. You can call OH_Hid_SetNonBlocking to change the mode.

Since: 18

Parameters

Name Description
dev Device operation handle.
data Buffer for storing the read data.
bufSize Size of the buffer for storing read data. The value cannot exceed HID_MAX_REPORT_BUFFER_SIZE.
bytesRead Number of bytes to read.

Required Permissions

ohos.permission.ACCESS_DDK_HID

Returns

  • HID_DDK_SUCCESS: Operation succeeded.

  • HID_DDK_NO_PERM: Permission verification failed.

  • HID_DDK_INVALID_PARAMETER: Parameter verification failed. Possible causes: 1. dev is empty. 2. data is empty. 3. The value of bufSize is 0. 4. The value of bufSize exceeds that of HID_MAX_REPORT_BUFFER_SIZE. 5. bytesRead is empty.

  • HID_DDK_INIT_ERROR DDK: DDK initialization error.

  • HID_DDK_SERVICE_ERROR: DDK service communication error.

  • HID_DDK_MEMORY_ERROR: Memory data copy error.

  • HID_DDK_IO_ERROR: I/O operation error.

  • HID_DDK_TIMEOUT: Reading timed out.

OH_Hid_ReadTimeout()

int32_t OH_Hid_ReadTimeout (Hid_DeviceHandle * dev, uint8_t * data, uint32_t bufSize, int timeout, uint32_t * bytesRead)

Description

Reads reports from the HID device within the specified timeout interval.

Since: 18

Parameters

Name Description
dev Device operation handle.
data Buffer for storing the read data.
bufSize Size of the buffer for storing read data. The value cannot exceed HID_MAX_REPORT_BUFFER_SIZE.
timeout Timeout interval, in ms. The value -1 indicates block waiting.
bytesRead Number of bytes to read.

Required Permissions

ohos.permission.ACCESS_DDK_HID

Returns

  • HID_DDK_SUCCESS: Operation succeeded.

  • HID_DDK_NO_PERM: Permission verification failed.

  • HID_DDK_INVALID_PARAMETER: Parameter verification failed. Possible causes: 1. dev is empty. 2. data is empty. 3. The value of bufSize is 0. 4. The value of bufSize exceeds that of HID_MAX_REPORT_BUFFER_SIZE. 5. bytesRead is empty.

  • HID_DDK_INIT_ERROR DDK: DDK initialization error.

  • HID_DDK_SERVICE_ERROR: DDK service communication error.

  • HID_DDK_MEMORY_ERROR: Memory data copy error.

  • HID_DDK_IO_ERROR: I/O operation error.

  • HID_DDK_TIMEOUT: Reading timed out.

OH_Hid_Release()

int32_t OH_Hid_Release (void)

Description

Releases an HID DDK.

Since: 18

Required Permissions

ohos.permission.ACCESS_DDK_HID

Returns

  • HID_DDK_SUCCESS: Operation succeeded.

  • HID_DDK_NO_PERM: Permission verification failed.

  • HID_DDK_INIT_ERROR DDK: DDK initialization error.

  • HID_DDK_SERVICE_ERROR: DDK service communication error.

OH_Hid_SendReport()

int32_t OH_Hid_SendReport (Hid_DeviceHandle * dev, Hid_ReportType reportType, const uint8_t * data, uint32_t length)

Description

Sends reports to the HID device.

Since: 18

Parameters

Name Description
dev Device operation handle.
reportType Report type.
data Data to be sent.
length Length of the data to be sent, in bytes. The value cannot exceed HID_MAX_REPORT_BUFFER_SIZE.

Required Permissions

ohos.permission.ACCESS_DDK_HID

Returns

  • HID_DDK_SUCCESS: Operation succeeded.

  • HID_DDK_NO_PERM: Permission verification failed.

  • HID_DDK_INVALID_PARAMETER: Parameter verification failed. Possible causes: 1. dev is empty. 2. data is empty. 3. The value of length is 0; 4. The value of length exceeds HID_MAX_REPORT_BUFFER_SIZE.

  • HID_DDK_INIT_ERROR DDK: DDK initialization error.

  • HID_DDK_SERVICE_ERROR: DDK service communication error.

  • HID_DDK_IO_ERROR: I/O operation error.

  • HID_DDK_INVALID_OPERATION: Invalid operation.

OH_Hid_SetNonBlocking()

int32_t OH_Hid_SetNonBlocking (Hid_DeviceHandle * dev, int nonBlock)

Description

Sets the device read mode to non-blocking mode.

Since: 18

Parameters

Name Description
dev Device operation handle.
nonBlock Whether to enable the non-blocking mode for reading data.
- 1: The non-blocking mode is enabled. When OH_Hid_Read is called, if the device has readable data, HID_DDK_SUCCESS is returned; if the device has no readable data, HID_DDK_TIMEOUT is returned.
- 0: The non-blocking mode is disabled.

Required Permissions

ohos.permission.ACCESS_DDK_HID

Returns

  • HID_DDK_SUCCESS: Operation succeeded.

  • HID_DDK_NO_PERM: Permission verification failed.

  • HID_DDK_INIT_ERROR DDK: DDK initialization error.

  • HID_DDK_INVALID_PARAMETER: Parameter verification failed. Possible causes: 1. dev is empty. 2. The value of nonBlock is not 1 or 0.

  • HID_DDK_SERVICE_ERROR: DDK service communication error.

OH_Hid_Write()

int32_t OH_Hid_Write (Hid_DeviceHandle * dev, uint8_t * data, uint32_t length, uint32_t * bytesWritten)

Description

Writes reports to an HID device.

Since: 18

Parameters

Name Description
dev Device operation handle.
data Data to be written.
length Length of the data to be written, in bytes. The value cannot exceed HID_MAX_REPORT_BUFFER_SIZE.
bytesWritten Number of written bytes.

Required Permissions

ohos.permission.ACCESS_DDK_HID

Returns

  • HID_DDK_SUCCESS: Operation succeeded.

  • HID_DDK_NO_PERM: Permission verification failed.

  • HID_DDK_INVALID_PARAMETER: Parameter verification failed. Possible causes: 1. dev is empty. 2. data is empty. 3. The value of length is 0; 4. The value of length exceeds HID_MAX_REPORT_BUFFER_SIZE; 5. bytesWritten is empty.

  • HID_DDK_INIT_ERROR DDK: DDK initialization error.

  • HID_DDK_SERVICE_ERROR: DDK service communication error.

  • HID_DDK_IO_ERROR: I/O operation error.

Variable Description

bustype

uint16_t Hid_Device::bustype

Description

Bus type.

busType

uint32_t Hid_RawDevInfo::busType

Description

Bus type.

code

uint16_t Hid_EmitItem::code

Description

Event code.

deviceName

const char* Hid_Device::deviceName

Description

Device name.

hidAbs

struct Hid_AbsAxesArray Hid_EventProperties::hidAbs

Description

Array of absolute coordinates.

hidAbsAxes

Hid_AbsAxes* Hid_AbsAxesArray::hidAbsAxes

Description

Array of absolute coordinates.

hidAbsFlat

int32_t Hid_EventProperties::hidAbsFlat[64]

Description

Fixed values of the absolute coordinates.

hidAbsFuzz

int32_t Hid_EventProperties::hidAbsFuzz[64]

Description

Fuzzy values of the absolute coordinates.

hidAbsMax

int32_t Hid_EventProperties::hidAbsMax[64]

Description

Maximum values of the absolute coordinates.

hidAbsMin

int32_t Hid_EventProperties::hidAbsMin[64]

Description

Minimum values of the absolute coordinates.

hidEventType

Hid_EventType* Hid_EventTypeArray::hidEventType

Description

Event type.

hidEventTypes

struct Hid_EventTypeArray Hid_EventProperties::hidEventTypes

Description

Array of event types.

hidKeyCode

Hid_KeyCode* Hid_KeyCodeArray::hidKeyCode

Description

Enumerates the key codes.

hidKeys

struct Hid_KeyCodeArray Hid_EventProperties::hidKeys

Description

Array of key codes.

hidMiscellaneous

struct Hid_MscEventArray Hid_EventProperties::hidMiscellaneous

Description

Array of miscellaneous events.

hidMscEvent

Hid_MscEvent* Hid_MscEventArray::hidMscEvent

Description

Miscellaneous event.

hidRelAxes

Hid_RelAxes* Hid_RelAxesArray::hidRelAxes

Description

Relative coordinate.

hidRelBits

struct Hid_RelAxesArray Hid_EventProperties::hidRelBits

Description

Array of relative coordinates.

length [1⁄5]

uint16_t Hid_EventTypeArray::length

Description

Size of the array.

length [2⁄5]

uint16_t Hid_KeyCodeArray::length

Description

Size of the array.

length [3⁄5]

uint16_t Hid_AbsAxesArray::length

Description

Size of the array.

length [4⁄5]

uint16_t Hid_RelAxesArray::length

Description

Size of the array.

length [5⁄5]

uint16_t Hid_MscEventArray::length

Description

Size of the array.

product

uint16_t Hid_RawDevInfo::product

Description

Product ID.

productId

uint16_t Hid_Device::productId

Description

Product ID.

properties

Hid_DeviceProp* Hid_Device::properties

Description

Device properties.

propLength

uint16_t Hid_Device::propLength

Description

Number of device properties.

type

uint16_t Hid_EmitItem::type

Description

Enumerates the event types.

value

uint32_t Hid_EmitItem::value

Description

Event value.

vendor

uint16_t Hid_RawDevInfo::vendor

Description

Provider ID.

vendorId

uint16_t Hid_Device::vendorId

Description

Vendor ID.

version

uint16_t Hid_Device::version

Description

Version.

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