hdf_io_service_if-h.md - Openharmony v1.0 / docs / api / api-SmartVision-Devices - 最全华为鸿蒙分布式操作系统技术资料库，手册，指南

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hdf_io_service_if-h.md

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Openharmony v1.0 / docs / api / api-SmartVision-Devices

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# hdf\_io\_service\_if.h
## **Overview**
**Related Modules:**
[Core](Core.md)
**Description:**
Declares the structures defining driver service objects and event listeners, as well as the functions for obtaining a driver service object, dispatching a driver service call, and registering or unregistering an event listener.
**Since:**
1.0
## **Summary**
## Data Structures

Data Structure Name	Description
HdfDevEventlistener	Defines a driver event listener object.
HdfIoDispatcher	Defines a driver service call dispatcher.
HdfIoService	Defines a driver service object.

## Typedefs

Typedef Name	Description
OnEventReceived) (void priv, uint32_t id, struct HdfSBuf data)	typedef int(* Called when a driver event occurs.

Typedef Name

Description

OnEventReceived) (void *priv, uint32_t id, struct HdfSBuf *data)

typedef int(*

Called when a driver event occurs.

## Functions

Function Name	Description
HdfIoServiceBind (const char *serviceName, mode_t permission)	struct HdfIoService * Obtains a driver service object.
HdfIoServiceRecycle (struct HdfIoService *service)	void Destroys a specified driver service object to release resources if it is no longer required.
HdfDeviceRegisterEventListener (struct HdfIoService target, struct HdfDevEventlistener listener)	int Registers a custom HdfDevEventlistener for listening for events reported by a specified driver service object.
HdfDeviceUnregisterEventListener (struct HdfIoService target, struct HdfDevEventlistener listener)	int Unregisters a previously registered HdfDevEventlistener to release resources if it is no longer required.