Diferents values of codeResult.code for the same object

[mpvalente24]

Right now, i am reading a lot of values, but sometimes, they are diferents for the same material.

component.ts:
...
onValueChanges(result) {
console.log(result);
this.barcodeValue = result.codeResult.code;
}
...
component.html
...

...

There is some explanation for that to happen?

[julienboulay]

Hi @mpvalente24,

Yes, some error can happen when reading the same barcode.
There is currently no way to verify the validity of the scan.
If you can compare with a barcode database, then you can know if this barcode is right.

Possible improvement : currently, the first result is taken. By getting multiple scan results (for example 10 simultaneous scans), we could check what's the most relevant value.

[dharmesh-parekh]

Hi @julienboulay

I am facing the same issue. I am getting different scan results every time when I scan for the same barcode. Compare each result with database every time to verify barcode is not proper way for the same barcode.

Can you please help me to resolve this issue?

Thanks.

[julienboulay]

Hi @dharmesh-parekh,

To ensure that your barcode is not analyzed in the wrong format, first verify that you limit barcode recognition to the type of barcode you want to handle.
For example, a code 128 might be analyzed as ean 8 and then give you wrong result.
In this case, set [type]="['code_128']" on you component

[julienboulay]

@dharmesh-parekh
Another way to limit false positive is to check decodedCodes.error and implement a sanityCheck to ensure the value matched the expected regexp.
See serratus/quaggaJS#237

[julienboulay]

I will try to provide a default implementation in the near futur

[RichardTezbirr]

Hi, was this issue resolved ? Or is somebody still working at this package ?

I saw https://stackblitz.com/edit/ngx-barcode-scanner-demo?file=src%2Fapp%2Fapp.component.html , which is new package, unfortunately unable to install as dependency to any project.

But trying live demo, it seems to work very fast compare to this package used by much more people.