Four integer values representing the calculated and found values of check digits. These values are filled only if the bCheckCheck property is true and only for EAN/UPC/UCC, Code 39 and Code 93 barcodes.
iChkC1 – calculated
first check digit
iChkA1 – found value of first check digit.
For Code 93 and Extended 93 barcodes a second check digit is used:
iChkC2 – calculated
second check digit
iChkA2 – found value of second check digit.