B4i Library iBarcode library

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:

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

 

[ilan]

great!!!

 

[jaraiza]

Excellent!! Does this work for QRCodes??

Thanks!

 

[jo1234]

Excellent!! Does this work for QRCodes??

Thanks!

Yes.

 

[jo1234]

Hi Erel,

unfortunately, the iBarcode lib (and iOS7/8) does not support barcodes in "Interleaved 2 of 5" format, which are absolutely essential for my app.

Please make also an Barcode library that is based on
http://zbar.sourceforge.net/

ZBar is an open source software. It supports many popular symbologies (types of bar codes) including EAN-13/UPC-A, UPC-E, EAN-8, Code 128, Code 39, Interleaved 2 of 5 and QR Code. ZBar is licensed under the GNU LGPL 2.1 to enable development of both open source and commercial projects.

I tested their app on a iPhone 6 and it is quick and reliable.

Please make this a B4i library, because otherwise I'm really stuck.

Thanks a lot!
John

 

[jo1234]

Actually, Interleaved 2 of 5 became available in iOS8:

AVMetadataObjectTypeInterleaved2of5Code

AVMetadataMachineReadableCodeObject instances generated from Interleaved 2 of 5 codes return this identifier as the type.
Available in iOS 8.0 and later.

https://developer.apple.com/library.../constant_group/Machine_Readable_Object_Types

Could you please enable this in the iBarcode lib?

Thanks a lot!
John

 

[Erel]

V1.01 is attached to the first post. Adds support for: Interleaved2of5Code, ITF14Code and DataMatrixCode.
All three require iOS 8+.

 

[jaraiza]

Yes.

Thanks for this great work!!

 

[jo1234]

Hi,

the scanning is quite slow, mostly because of the autofocus.
It could help to restrict the autoFocusRangeRestriction to AVCaptureAutoFocusRangeRestrictionNear.

I found this code on http://stackoverflow.com/questions/15782083/set-an-initial-focal-distance-on-ios

AVCaptureDevice *cameraDevice = zbarReaderView.device;
if ([cameraDevice respondsToSelector:@selector(isAutoFocusRangeRestrictionSupported)] && cameraDevice.autoFocusRangeRestrictionSupported) {
  // If we are on an iOS version that supports AutoFocusRangeRestriction and the device supports it
  // Set the focus range to "near"
  if ([cameraDevice lockForConfiguration:nil]) {
  cameraDevice.autoFocusRangeRestriction = AVCaptureAutoFocusRangeRestrictionNear;
  [cameraDevice unlockForConfiguration];
  }
}

How can I use this in B4i with the iBarcode library?

Thanks a lot!

 

[Erel]

The code you found is actually not 100% correct. However I've added this feature to v1.02 (attached to the first post). It automatically sets the focus to near items. Seems to improve the performance.

 

[little3399]

Hi, Erel
When I compile the demo success , and install on my iPhone5 , but it happen "flash back" .... suddenly close one application by accident and jump to the main menu

 

[Erel]

Not sure that I understand. Does the program crash? Is there any error message in the logs?

 

[little3399]

Hi, Erel,

Yes ,the progrma was crash , where I can find the logs ? need help , tks!

 

[Erel]

Check the Logs tab in the IDE.

 

[jaraiza]

Check the Logs tab in the IDE.

Hi,

Does the entire library require iOS 8? I'm also having the crash (iPad Air) and there's nothing in log Window...

I took a video (is unlisted, you need the link to see it)

 

[Erel]

Can you upload your project?

 

[jaraiza]

Can you upload your project?

Hi!

Is the example you posted, "BarcodeExample.zip", I haven't added it to my project because the example doesn't work for me. I'm using the library 1.02.

I'm sorry I don't have more clues for you

Thanks!

 

[Erel]

Does it happen if you comment the scanner.Initialize line?

 

[jaraiza]

Does it happen if you comment the scanner.Initialize line?

Yep, I've just tested and it does the same... But I've noticed something really weird, I put a debugger break on the first line "NavControl = Nav" but the bridge never get there

I commented "Private scanner As BarcodeScanner" just in case, but it stills don't enter "Application_Start" Sub.

Ok, the problem is the library itself, I've just deactivated it and the debugger enters Application Start Sub

Greets!

 

[jaraiza]

P.D.

Just in case, I haven't updated the iPad, it still has iOS 7.1.2