Queries the information about a file that is uploaded to IoT Platform from a device.


Each Alibaba Cloud account can run a maximum of 500 queries per second (QPS).

Note RAM users of an Alibaba Cloud account share the quota of the account.


Alibaba Cloud provides OpenAPI Explorer to simplify API usage. OpenAPI Explorer automatically calculates the signature value. For your convenience, we recommend that you call this operation in OpenAPI Explorer. OpenAPI Explorer dynamically generates the sample code of the operation for different SDKs.

Request parameters

Parameter Type Required Example Description
Action String Yes QueryDeviceFile

The operation that you want to perform. Set the value to QueryDeviceFile.

FileId String Yes xL0G67MBLBDtkR7GCfT******

The ID of the file. You can call the QueryDeviceFileList operation and view the file ID in the response.

IotInstanceId String No iot_instc_pu****_c*-v64********

The ID of the instance. You can view the instance ID on the Overview page in the IoT Platform console.

  • If your instance has an ID, you must configure this parameter. If you do not set this parameter, the call fails.
  • If your instance has no Overview page or ID, you do not need to set this parameter.

For more information, see Overview.

ProductKey String No a1BwAGV****

The ProductKey of the product to which the device belongs.

Note If you specify this parameter, you must also specify the DeviceName parameter.
DeviceName String No light

The name of the device.

Note If you specify this parameter, you must also specify the ProductKey parameter.
IotId String No Q7uOhVRdZRRlDnTLv****00100

The ID of the device. The device ID is issued by IoT Platform.

Note If you specify this parameter, you do not need to specify ProductKey or DeviceName. The IotId parameter specifies a globally unique identifier (GUID) of the device, which corresponds to a combination of ProductKey and DeviceName. If you specify both IotId and the combination of ProductKey and DeviceName, IotId takes precedence.

In addition to the preceding operation-specific request parameters, you must specify common request parameters when you call this operation. For more information, see Common request parameters.

Response parameters

Parameter Type Example Description
Code String iot.system.SystemException

The error code returned if the call fails. For more information, see Error codes.

Data Struct

The file information returned if the call succeeds.

DownloadUrl String http://iotx-file-store.oss-cn-shanghai.aliyuncs.com/device_file/A849E4E5CFF64804A18D9384AC9D****/aGEKIpp5NAGxdP2oo90000****/testFile3.txt?Expires=1553162075&OSSAccessKeyId=LTAIYLScbHiV****&Signature=%2F88xdEFPukJ****%2F8****%2Bdv3io%3D

The download URL of the file.

FileId String 6UCo1SqbqnQEoh9aKqDQ01****

The ID of the file.

Name String testFile3.txt

The name of the file.

Size String 102400

The size of the file. Unit: KB.

UtcCreatedOn String 2019-03-21T08:45:42.000Z

The time when the file was created.

ErrorMessage String A system exception occurred.

The error message returned if the call fails.

RequestId String E55E50B7-40EE-4B6B-8BBE-D3ED55CCF565

The ID of the request.

Success Boolean true

Indicates whether the call was successful.

  • true: The call was successful.
  • false: The call failed.


Sample requests

&<Common request parameters>

Sample success responses

XML format


JSON format

  "RequestId": "93C5276D-5C8A-40D9-BFD6-4BD5B8C1A08F",
  "Data": {
    "Name": "testFile3.txt",
    "DownloadUrl": "http://iotx-file-store.oss-cn-shanghai.aliyuncs.com/device_file/A849E4E5CFF64804A18D9384AC9D****/aGEKIpp5NAGxdP2oo90000****/testFile3.txt?Expires=1553162075&OSSAccessKeyId=LTAIYLScbHiV****&Signature=%2F88xdEFPukJ****%2F8****%2Bdv3io%3D",
    "FileId": "6UCo1SqbqnQEoh9aKqDQ01****",
    "UtcCreatedOn": "2019-03-21T08:45:42.000Z",
    "Size": "102400"
  "Success": true

Error codes

For a list of error codes, visit the API Error Center.