Code128 Barcode Validation

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Rafael Guerra

Feb 11, 2016, 12:10:23 PM2/11/16
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In my application, I have a barcode string (Code128 or not). Is possible in ZXing to validate this string if is really a Code128 Barcode ?

Bas Vijfwinkel

Feb 11, 2016, 11:37:47 PM2/11/16
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Code128 has a check digit so if your barcode is not valid than it is likely that the check digit will also fail.
Besides the check digit, the code128 standard needs some whitespaces before and after the barcode and for detection a start and stop character have been added.
There is not much chance that you just scan something that will match a code128 barcode.
So if ZXing says it is valid, it probably is.
If it cannot scan the code than it is either something else or the code isn't readable.

Some other barcodes like codabar are lacking these features and can generate a false positive more easily.

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