B4J Library [BANano] Dynamsoft Barcode Reader

I've created the B4X version of this Barcode SDK and here is the BANano version.

Dynamsoft Barcode Reader is written in C++. They provide a JavaScript version which uses WebAssembly.

The library can read local images or do a live scan.

Decode an image:

Private Sub decodeButton_Click (event As BANanoEvent)
    resultContainer.Element.SetHTML("Decoding...")
    Dim results As List=BANano.Await(reader.decode(codeImage.Src))
    Dim sb As StringBuilder
    sb.Initialize    
    Dim index As Int
    For Each tr As TextResult In results        
        index=index+1
        sb.Append(index).Append(". ")        
        sb.Append(tr.Text)
        sb.Append("<br/>")        
    Next
    resultContainer.Element.SetHTML(sb.ToString)
End Sub

Start live scan and get the result in callback:

Private Sub scanButton_Click (event As BANanoEvent)
    scanner.show
End Sub

private Sub scanner_onUnduplicatedRead(txt As String,result As TextResult)
    resultLabel.Text=result.Text
    SKModal1.Open    
End Sub

private Sub scanner_onFrameRead(results() As TextResult)

End Sub

A live demo: https://pwa.xulihang.me/barcodereader/

The whole project is uploaded.

 

[alwaysbusy]

Thank you for sharing! Looks like a great addition

 

[xulihang]

Hi @alwaysbusy,

In the TextResult.bas, I tried to return an array of a custom class. But I ran into an Uncaught SyntaxError: Unexpected identifier error.

'bug of BANano, unable to return Point2D()
Public Sub getResultPoints As Object
    Return mResultPoints
End Sub

 

[alwaysbusy]

Yes, I see that too. Somehow the transpiler does not see the result as an array. I will look into that.

For the moment, probably the easiest what you could do is returning a List, and then you can use:

        Dim points As List = tr.ResultPoints
        For k = 0 To points.size - 1
            Dim p As Point2D = points.get(k)
            Log(p.x)
            Log(p.y)
        Next

Thanks for reporting this!

Alwaysbusy

 

[Mashiane]

Awesome thanks, I've been looking for something like this.

 

[xulihang]

An article is written about how the demo and library is made: Web Barcode Reader using B4X