How to handle error NotFoundException: startSize = 0

[JamesKrub]

please kindly recommend me to check specific error without using like this in Golang

err.Error() == "NotFoundException: startSize = 0"

[makiuchi-d]

Using errors.As:

var t gozxing.NotFoundException
if errors.As(err, t) {
    fmt.Println("Not found exception")
}

Or, using type assertion:

_, ok := err.(gozxing.NotFoundException)
if ok {
    fmt.Println("Not found exception")
}