Imports github.com/thinkgos/x/extstr github.com/thinkgos/x/lib/algo github.com/boombuler/barcode github.com/thinkgos/x/extos github.com/boombuler/barcode/qr golang.org/x/image/bmp Standard library imports bytes encoding/base64 fmt io os path/filepath strings image/png image/jpeg image/gif