HdfDriverEntry.md

# HdfDriverEntry
## **Overview**
**Related Modules:**
[Core](Core.md)
**Description:**
Defines the entry structure of the driver in the HDF.
This structure must be used as the entry for the driver to use the HDF mechanism.
**Since:**
1.0
## **Summary**
## Data Fields

Variable Name	Description
moduleVersion	int32_t
moduleName	const char *
Bind )(struct HdfDeviceObject *deviceObject)	int32_t(*  Binds the external service interface of a driver to the HDF. This function is implemented by the driver developer and called by the HDF.
Init )(struct HdfDeviceObject *deviceObject)	int32_t(*  Initializes the driver. This function is implemented by the driver developer and called by the HDF.
Release )(struct HdfDeviceObject *deviceObject)	void(*  Releases driver resources. This function is implemented by the driver developer. When an exception occurs during driver loading or the driver is uninstalled, the HDF calls this function to release the driver resources.

## **Details**
## **Field Documentation**
## Bind
```
int32_t(* HdfDriverEntry::Bind) (struct [HdfDeviceObject](HdfDeviceObject.md) *deviceObject)
```
**Description:**
Binds the external service interface of a driver to the HDF. This function is implemented by the driver developer and called by the HDF.
**Parameters:**

Name	Description
deviceObject	Indicates the pointer to the variable of the HdfDeviceObject type. This variable is generated by the HDF and passed to the driver. Then, the service object of the driver is bound to the service parameter of deviceObject.

**Returns:**
Returns **0** if the operation is successful; returns a non-zero value otherwise.
## Init
```
int32_t(* HdfDriverEntry::Init) (struct [HdfDeviceObject](HdfDeviceObject.md) *deviceObject)
```
**Description:**
Initializes the driver. This function is implemented by the driver developer and called by the HDF.
**Parameters:**

Name	Description
deviceObject	Indicates the pointer to the variable of the HdfDeviceObject type. It is the same as the parameter of Bind.

**Returns:**
Returns **0** if the operation is successful; returns a non-zero value otherwise.
## moduleName
```
const char* HdfDriverEntry::moduleName
```
**Description:**
Driver module name, which is used to match the driver information in the configuration file.
## moduleVersion
```
int32_t HdfDriverEntry::moduleVersion
```
**Description:**
Driver version
## Release
```
void(* HdfDriverEntry::Release) (struct [HdfDeviceObject](HdfDeviceObject.md) *deviceObject)
```
**Description:**
Releases driver resources. This function is implemented by the driver developer. When an exception occurs during driver loading or the driver is uninstalled, the HDF calls this function to release the driver resources.
**Parameters:**

Name	Description
deviceObject	Indicates the pointer to the variable of the HdfDeviceObject type. It is the same as the parameter of Bind.