QueryDeviceFile - IoT Platform - Alibaba Cloud Documentation Center

Limits

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.

Debugging

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. Notice 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.

Examples

Sample requests

https://iot.cn-shanghai.aliyuncs.com/?Action=QueryDeviceFile
&ProductKey=a1BwAGV****
&DeviceName=deviceName1
&FileId=6UCo1SqbqnQEoh9aKqD******
&<Common request parameters>

Sample success responses

XML format

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

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.