WeChat public platform development and uploading and downloading multimedia files

When a public account replies to images, audios, and videos, it uses media_id to call related files. Many friends have asked how to develop and implement this function. This article describes how to upload and download multimedia files during public platform development. When a public account replies to images, audios, and videos, it uses media_id to call related files. Many friends have asked how to develop and implement this function. This article describes how to upload and download multimedia files during public platform development.

1. Upload multimedia files

You can call this interface to upload images, audios, videos, and other files to the server. after the files are uploaded, the server returns the corresponding media_id. the public account can then be used to obtain multimedia files based on the media_id. Please note that media_id is reusable and the http protocol is required to call this interface.

Generally, files are uploaded through html forms, but CURL can directly submit the form POST on the server without passing through the browser to complete the file upload function.

Note that the file name must be a complete absolute path, and "@" must be added before the absolute path to differentiate.

On a Windows Server, the format example is "@ F: \ israel \ upload \ winter.jpg". on a Linux server, the format example is: "@ home/israel/upload/winter.jpg ".

Http request method: POST/FORM

Http://file.api.weixin.qq.com/cgi-bin/media/upload? Access_token = ACCESS_TOKEN & type = TYPE

Parameter description

Parameters	Required?	Description
Access_token	Yes	Interface call credential
Type	Yes	Media file types, including image, voice, video, and thumb)
Media	Yes	The ID of a media file in form-data, including filename, filelength, and content-type.

Upload images

Returned results

{    "type": "image",    "media_id": "QQ9nj-7ctrqA8t3WKU3dQN24IuFV_516MfZRZNnQ0c-BFVkk66jUkPXF49QE9L1l",    "created_at": 1389793969}

Upload voice

Returned results

{    "type": "voice",    "media_id": "5Idx79V9E3XfBCz_A50gr1a1_klgPpJnb_eq73yz0bn-prhIsNlwI3n6jQgshmWk",    "created_at": 1389794760}

Upload video

Returned results

{    "type": "video",    "media_id": "Jm-Wq0nXtA_oN1qNydQRP03dCsB0R2t5gCHDM3QNkBmMRE1WBaorVJNQTBRHvK9-",    "created_at": 1389794768}

Upload thumbnails

Returned results

{    "type": "thumb",    "thumb_media_id": "2RhP0caRKHVOmZO5AKelHkK--vqPPwgUaRp5-WE63dvmmPRWiYVKgvNblIp_gv79",    "created_at": 1389794771}

Parameter description

Parameters	Description
Type	Media file types, including image, voice, video, and thumb. They are mainly used for thumbnails of videos and music formats)
Media_id	Unique identifier of a media file after it is uploaded
Created_at	Media file Upload timestamp

Notes

The formats and sizes of uploaded multimedia files are limited as follows:

Image: 128 KB. JPG format is supported.

Voice (voice): 256 K. The playback length cannot exceed 60 s. It supports the AMR \ MP3 format.

Video: 1 MB. MP4 format is supported.

Thumbnail (thumb): 64 KB, JPG format supported

The media file is saved in the background for three days, that is, the media_id is invalid three days later. For multimedia files that need to be reused, you can upload them cyclically every three days to update media_id.

II. download multimedia files

You can call this interface to obtain multimedia files. Note that video files cannot be downloaded. http is required to call this interface.

To download a file, use the method of getting image data and writing it to a new file.

Http request method: GET

Http://file.api.weixin.qq.com/cgi-bin/media/get? Access_token = ACCESS_TOKEN & media_id = MEDIA_ID

Parameter description

Parameters	Required?	Description
Access_token	Yes	Interface call credential
Media_id	Yes	Media File ID

Download images

Code implementation

Return HTTP header example:

{    "url": "http://file.api.weixin.qq.com/cgi-bin/media/get?access_token=My4oqLEyFVrgFF-XOZagdvbTt9XywYjGwMg_GxkPwql7-f0BpnvXFCOKBUyAf0agmZfMChW5ECSyTAgAoaoU2WMyj7aVHmB17ce4HzLRZ3XFTbm2vpKt_9gYA29xrwIKpnvH-BYmNFSddt7re5ZrIg&media_id=QQ9nj-7ctrqA8t3WKU3dQN24IuFV_516MfZRZNnQ0c-BFVkk66jUkPXF49QE9L1l",    "content_type": "image/jpeg",    "http_code": 200,    "header_size": 308,    "request_size": 316,    "filetime": -1,    "ssl_verify_result": 0,    "redirect_count": 0,    "total_time": 1.36,    "namelookup_time": 1.016,    "connect_time": 1.078,    "pretransfer_time": 1.078,    "size_upload": 0,    "size_download": 105542,    "speed_download": 77604,    "speed_upload": 0,    "download_content_length": 105542,    "upload_content_length": 0,    "starttransfer_time": 1.141,    "redirect_time": 0}

Download Voice

Code implementation

The returned HTTP header is as follows:

{    "url": "http://file.api.weixin.qq.com/cgi-bin/media/get?access_token=My4oqLEyFVrgFF-XOZagdvbTt9XywYjGwMg_GxkPwql7-f0BpnvXFCOKBUyAf0agmZfMChW5ECSyTAgAoaoU2WMyj7aVHmB17ce4HzLRZ3XFTbm2vpKt_9gYA29xrwIKpnvH-BYmNFSddt7re5ZrIg&media_id=5Idx79V9E3XfBCz_A50gr1a1_klgPpJnb_eq73yz0bn-prhIsNlwI3n6jQgshmWk",    "content_type": "audio/amr",    "http_code": 200,    "header_size": 306,    "request_size": 316,    "filetime": -1,    "ssl_verify_result": 0,    "redirect_count": 0,    "total_time": 0.125,    "namelookup_time": 0.031,    "connect_time": 0.063,    "pretransfer_time": 0.063,    "size_upload": 0,    "size_download": 10470,    "speed_download": 83760,    "speed_upload": 0,    "download_content_length": 10470,    "upload_content_length": 0,    "starttransfer_time": 0.125,    "redirect_time": 0}

It can be seen that the audio format of MP3 is compressed into AMR format.

Download thumbnail

Implementation code

The returned HTTP header is as follows:

{    "url": "http://file.api.weixin.qq.com/cgi-bin/media/get?access_token=My4oqLEyFVrgFF-XOZagdvbTt9XywYjGwMg_GxkPwql7-f0BpnvXFCOKBUyAf0agmZfMChW5ECSyTAgAoaoU2WMyj7aVHmB17ce4HzLRZ3XFTbm2vpKt_9gYA29xrwIKpnvH-BYmNFSddt7re5ZrIg&media_id=2RhP0caRKHVOmZO5AKelHkK--vqPPwgUaRp5-WE63dvmmPRWiYVKgvNblIp_gv79",    "content_type": "image/jpeg",    "http_code": 200,    "header_size": 306,    "request_size": 316,    "filetime": -1,    "ssl_verify_result": 0,    "redirect_count": 0,    "total_time": 0.094,    "namelookup_time": 0,    "connect_time": 0.047,    "pretransfer_time": 0.047,    "size_upload": 0,    "size_download": 6057,    "speed_download": 64436,    "speed_upload": 0,    "download_content_length": 6057,    "upload_content_length": 0,    "starttransfer_time": 0.094,    "redirect_time": 0}

To reply to a message, you can use the message interface or customer service interface to construct the corresponding message. the method for constructing text and text messages is the same.

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