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 · Dec 11, 2014

I've uploaded a new version (1.03) to the first post that fixes this issue.

jaraiza · Dec 11, 2014

WOW, thanks!! Now it works You've the best product support I've seen in ages Thanks again!

jo1234 · Dec 30, 2014

Unfortunately, the library has serious problems after several quick start/stop cycles.

You can test this in the example if you add

B4X:

scanner.Stop
btnStart.Enabled = True
btnStop.Enabled = False

to Sub scanner_Detected.

Resulting code:

B4X:

Sub scanner_Detected (Codes As List)
   Dim sb As StringBuilder
   sb.Initialize
   sb.Append("Detected code:").Append(CRLF)
   For Each code As BarcodeCode In Codes
     sb.Append(code.Value).Append(CRLF)
   Next
   Label1.Text = sb.ToString
   scanner.Stop
   btnStart.Enabled = True
   btnStop.Enabled = False
End Sub

Start the example, scan a QR code, and quickly press start again to scan the next QR code.
After several cycles, the autofocus gets slower, and the screen stays blank or freezes.

I had one occasion where after the scan it displayed the read code correctly as value, but always showed the same wrong image of a previous scan.

I have the same problem in my app: I start the scanner, read a barcode, stop the scanner, process the barcode, start the scanner again to scan the next barcode.
If this is repeated several times, the app freezes.

Any chance to fix this?

Erel · Dec 30, 2014

You don't need to stop and start the scanner after each detection.

jo1234 · Dec 30, 2014

My app needs to stop after each detection, because it jumps to a results page and shows detailed information. The user can then decide to scan the next barcode.

A continuous scan is not an option for me.

jaraiza · Dec 30, 2014

jo1234 said:
My app needs to stop after each detection, because it jumps to a results page and shows detailed information. The user can then decide to scan the next barcode.

A continuous scan is not an option for me.

Mmmm... What happens if you try to leave the scanner in "started" mode and only hide the scanner panel when done? Only call scanner.Stop when the user choose not to scan any other code (an exit button) or when the app is closed?

Erel · Dec 31, 2014

Another thing that you can try is to use a timer or CallSubDelayed to stop the scanner a short period after the Scanner_Detected event.

incendio · Feb 12, 2015

Does this library support bulk scan? It means scan continuosly and returns all results when user stop scanning.

Erel · Feb 12, 2015

Yes. See the video in the first post. You can scan as many codes as you like.

JanPRO · Jul 28, 2015

@Erel: Can you maybe upload the Xcode library project?

Erel · Jul 28, 2015

What do you need it for?

JanPRO · Jul 28, 2015

Just as an example for learning writing a wrapper

Erel · Jul 28, 2015

If you have never written a B4i library then it is better to start with a simple one, such as this one: https://www.b4x.com/android/forum/threads/leadbolt-ads.47652/#content

JanPRO · Jul 28, 2015

Ok, thanks.

Douglas Farias · Oct 2, 2015

@Erel
on github description have this

Controlling the Torch
To control the torch, set the torchMode property or call the toggleTorch method.

Available values include:

MTBTorchModeOff,
MTBTorchModeOn,
MTBTorchModeAuto

this lib have option for torch?

thx

edit i have made this with phone lib thx

Ian Gordon-Brown · Feb 1, 2016

Hey Guys

I am being told I need the jar file for the xml. Any help?

Erel · Feb 1, 2016

This is a B4i library. There is no jar.

Christian Abate · Aug 4, 2016

Hi,
Just a quick question, How can I delete the empty space at the begining of a textfield after the scan?

Erel · Aug 4, 2016

Which text field? In this example the code is displayed with a Label.

B4X:

Label1.Text = sb.ToString

Christian Abate · Aug 4, 2016

Exactly, I take the scanned result from the label and pass it to a txtfield. when that happens It has an empty space at the beginning. my question is how to avoid that.

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