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POSBOX 無法列印 QR Code

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修改 escpos.py

sudo vim ~/odoo/addons/hw_escpos/escpos/escpos.py

依照此篇文章的介紹修改

https://github.com/fvdsn/py-xml-escpos/pull/6/files#diff-40c079194a34ca9b56a8d304d1eb20aeR832

重啟服務,就可以列印 Qr Code了

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