INT32S DRV_DeviceOpen ( char * DeviceFile， PRT_T * DeviceHandle );
Opens the corresponding installed device by its device file(DeviceFile) and gets the DeviceHandle for later operations. This function must be called before any other methods that perform I/O operations.
| Name | Direction | Rage | Description |
| DeviceFile | input | default | It is the device file associated with special device by advdevice_bind utility. |
| DeviceHandle | output | default | The pointer retrieved from the DRV_DeviceOpen which specifies the target device. |
| 1. 0 | Successful. |
| 2. other value | error occured, please refer to ErrorCode |
1. After the operation of any function, such as DIO, AO and AI, that relates to the device allocated resources, the user must call the DRV_DeviceClose to release the device (allocated by using DRV_DeviceOpen) resources.