# HdfDeviceIoClient
- [Overview](#section651574459165631)
- [Summary](#section1237984387165631)
- [Data Fields](#pub-attribs)
- [Details](#section1682215971165631)
- [Field](#section1250885591165631)
- [device](#a49e622cbc385f17b3800580157558031)
- [priv](#aef6d8dd955ee8305554d89d1c64486c7)
## **Overview**
**Related Modules:**
[Core](Core.md)
**Description:**
Defines the client object structure of the I/O service.
This structure describes the invoker information of the I/O servcie.
**Since:**
1.0
## **Summary**
## Data Fields
## **Details**
## **Field **
## device
```
struct [HdfDeviceObject](HdfDeviceObject.md)* HdfDeviceIoClient::device
```
**Description:**
Device object corresponding to the client object
## priv
```
void* HdfDeviceIoClient::priv
```
**Description:**
Private data of the client object. The driver can use **priv** to bind the internal data with the client.