UPCVersionA

jdubs edited this page Oct 21, 2016 · 1 revision

Table of Contents

Overview

Enforces the symbology of the Universal Product Code (UPC) and returns the calculated pattern.

Parameters

SpecName (constant) The variable containing the input to be converted. Proper UPC font must be applied in the template.

ErrorMessage (multiple | optional) The error message to return when any error occurs.

Synopsis

This method follows the specifications of the Universal Product Code (UPC) system developed in North America. The UPC barcode is defined by the standards organization GS1.

Source Code

public static void UPCVersionA(string SpecName, object ErrorMessage)
{
	Break();
	try
	{
		double sum;
		double x = 0; // the odd numbered digits added then multiplied by 3
		double y = 0; // the even numbered digits added then subtracted from the next-highest multiple of ten
		string barcode = String.Empty;

		char[] chars = Variable(SpecName).Value.ToCharArray();

		if (chars.Length != 11)
			throw new Four51ActionsException("UPC-A barcode must be 11 digits");
		
		// string substitution for the 1st character
		barcode = CharReplacement(chars[0], BarcodeSymbology.UPCA).ToString();

		// string substitution for the left notch
		for (int i = 1; i < 6; i++)
		{
			barcode += ((char)(Char.GetNumericValue(chars[i]) + 65)).ToString();
		}

		// stop start char for middle of barcode
		barcode += "y";

		// the third set does not get encoded
		for (int i = 6; i <= chars.GetUpperBound(0); i++)
		{
			barcode += chars[i].ToString();
		}

		// calculate checksum
		for (int i = 0; i <= chars.GetUpperBound(0); i++)
		{
			if ((i % 2) != 0)
				y += Convert.ToInt32(chars[i].ToString());
			else
				x += Convert.ToInt32(chars[i].ToString());
		}

		sum = (x * 3) + y;
		sum = (10 - (sum % 10)) % 10;

		barcode += String.Format("{0}z{1}",
			((char)(sum + 107)).ToString(),
			CharReplacement(sum.ToString().ToCharArray()[0], BarcodeSymbology.UPCA_checkdigit).ToString());

		Variable(SpecName).Value = barcode.ToString();
	}
	catch (Exception ex)
	{
		throw new Four51ActionsException(ex.Message, (string)ErrorMessage);
	}
}

Referenced Methods

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