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景朝阳
这个问题是你windows终端的问题，windows终端使用的gbk编码，而unicode编码的emoji在转gbk时会报错，因为gbk没有对应的字符集。想解决这个问题可以作个emoji的过滤函数，将emoji的字符给过滤掉。或者就是换个支持utf-16的终端来运行。
微信网页版，正常使用，过2天左右也会掉（自己的经历）。
Thanks for your reply, it works fine using the code you provided. Was the reason it didn't work before because there were other pixels interfering with the QR code?