Here are the values I found from the Development Library: http://help.wavelink.com/docs/help/en_US/Studio/vnext/Default.htm#WLCOMLib/AddBarcode_Method.htm?Highlight=barcode
The barcode configuration type. The possible values for nType are:
CODE_39
UPC_A
UPC_E0
EAN_13
EAN_8
CODE_D25
CODE_I25
CODABAR
CODE_128
CODE_93
CODE_11
MSI
UPC_E1
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