B4i Library iBarcode library

Erel · Nov 24, 2014

This library allows you to use the device camera to scan for all kinds of barcodes.
It is based on this open source project: https://github.com/mikebuss/MTBBarcodeScanner
License: https://github.com/mikebuss/MTBBarcodeScanner/blob/master/LICENSE

The attached example demonstrates how to use this library.
The main steps are:
1. Initialize the BarcodeScanner and set the preview panel.
2. In the panel resize event call scanner.Resize to resize the preview layer when needed.
3. The ready event will be raised when the scanner is ready. If Success is true then you can start scanning.
4. Call scanner.Start to start scanning.
5. The Detected event will be raised when a code is detected.

Edit: You need to add this line to the example:

B4X:

#PlistExtra:<key>NSCameraUsageDescription</key><string>Read barcodes</string>

Erel · Aug 5, 2016

You can trim spaces with:

B4X:

Label1.Text = sb.ToString.Trim

Christian Abate · Aug 6, 2016

TRIM!!! of course. completely forgot about it.

Thanks!

ToolboxZX · Oct 27, 2016

Hi,
Is there any changes necessary to the example to use it with the latest IDE? With an ipad air I am having a similar experience to another user. The applications crashes when it comes to the line: scanner.Initialize("scanner", Panel1). No errors in the log. Thank you.

Erel · Oct 27, 2016

Yes. It is related to a new requirement. You should add this line:

B4X:

#PlistExtra:<key>NSCameraUsageDescription</key><string>Read barcodes</string>

I've updated the example.

Fabio Campanella · Sep 5, 2017

Hi Erel,
in this link: https://www.b4x.com/android/forum/threads/updates-to-internal-libraries.48179/page-3#post-396758

I don't find the iBarcode library!! Can you help me?

Erel · Sep 6, 2017

It should be preinstalled in the IDE.

Fabio Campanella · Sep 7, 2017

ouch... ... Sorry!!...Thanks Erel.

luke2012 · Sep 13, 2017

Thanks for this library @Erel.
Is there also a version for B4A ?

Erel · Sep 13, 2017

Use the search feature: https://www.b4x.com/android/forum/pages/results/?query=barcode&prefix=1,2,3,17,24,29&product=b4a

Erel · Jul 12, 2021

iBarcode v1.21 released. It allows setting the scan window.

It should be done after the scanner is started:

B4X:

Sub Page1_BarButtonClick (Tag As String)
    Select Tag
        Case "Start"
            scanner.Start
            Sleep(100)
            Dim scanrect As Rect
            scanrect.Initialize(50, 10, 250, 210)
            scanner.ScanRect = scanrect
            btnStop.Enabled = True
            btnStart.Enabled = False
        Case "Stop"
            scanner.Stop
            btnStart.Enabled = True
            btnStop.Enabled = False
    End Select
End Sub

Updates to internal libraries

This thread will be used for updates of libraries that are included in the IDE. You should check the currently installed version before updating an internal library. Installation instructions Each zip file contains three files with the following extensions: .xml, .a and .h. You need to copy...

www.b4x.com

aeric · Jul 12, 2021

Erel said:
View attachment 116211

iBarcode v1.21 released. It allows setting the scan window.

It should be done after the scanner is started:

B4X:

Sub Page1_BarButtonClick (Tag As String) Select Tag Case "Start" scanner.Start Sleep(100) Dim scanrect As Rect scanrect.Initialize(50, 10, 250, 210) scanner.ScanRect = scanrect btnStop.Enabled = True btnStart.Enabled = False Case "Stop" scanner.Stop btnStart.Enabled = True btnStop.Enabled = False End Select End Sub

Updates to internal libraries

This thread will be used for updates of libraries that are included in the IDE. You should check the currently installed version before updating an internal library. Installation instructions Each zip file contains three files with the following extensions: .xml, .a and .h. You need to copy...

www.b4x.com

Is this mean outside the rectangle, barcode will not be scan? So I can use opaque panels to cover the transparent area.

Erel · Jul 12, 2021

Yes. In the example above, I've added a panel with red border to mark the scanned area.

MrKim · Jul 12, 2021

Erel said:
iBarcode v1.21 released. It allows setting the scan window.

Erel, you are amazing! Thank you. Took me less than 5 minutes to implement the new feature and it works perfectly.

yiankos1 · Oct 23, 2021

Good morning Erel,

Could you please add the last type:

B4X:

AVMetadataObjectTypeAztecCode

Moreover, my IDE still has 1.20 version (just updated to 7.80 beta)

Thank you for your time.

Erel · Oct 24, 2021

v1.22 will be included in the stable version and will include the aztec type.

imbault · Jul 5, 2022

Very good library, @Erel , is it possible to get the photo (for example adding a button bellow the panel) of the scan window?

Thanks a lot

Patrick

Erel · Jul 6, 2022

Please start a new thread for this question.

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