I would like to know how to make barcodes do not know what principles do. If the check box is turned on every hand is impossible please correct so that no misunderstanding.
I do know that the bar code does not know what to do based. If you open the box, check the box would be impossible not to be mistaken, please correct it.
I want to know what do not adhere to the principles of code to do it. To open the box to check every box would be impossible, please resolve not to be mistaken.