How to identify QR Code in WeChat Mini Programs

I want to make a page where WeChat Mini Programs guides users to download APP. I use wx.previewImage, but there is no option to identify the QR code.

clipboard.png

clipboard.png

QR-code WeChat-Mini-Programs
Mar.16,2021

WeChat Mini Programs cannot recognize the QR code
this interface is not open

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1eab8d4-5ce80.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1eab8d4-5ce80.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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