/// <summary>
/// Transform the string into integers representing the Code128 codes
/// necessary to represent it
/// </summary>
/// <param name="AsciiData">String to be encoded</param>
/// <returns>Code128 representation</returns>
private int[] StringToCode128(string AsciiData)
{
// turn the string into ascii byte data
byte[] asciiBytes = Encoding.ASCII.GetBytes(AsciiData);
// decide which codeset to start with
Code128Code.CodeSetAllowed csa1 = asciiBytes.Length > 0 ? Code128Code.CodesetAllowedForChar(asciiBytes[0]) : Code128Code.CodeSetAllowed.CodeAorB;
Code128Code.CodeSetAllowed csa2 = asciiBytes.Length > 0 ? Code128Code.CodesetAllowedForChar(asciiBytes[1]) : Code128Code.CodeSetAllowed.CodeAorB;
CodeSet currcs = GetBestStartSet(csa1, csa2);
// set up the beginning of the barcode
System.Collections.ArrayList codes = new System.Collections.ArrayList(asciiBytes.Length + 3); // assume no codeset changes, account for start, checksum, and stop
codes.Add(Code128Code.StartCodeForCodeSet(currcs));
// add the codes for each character in the string
for (int i = 0; i < asciiBytes.Length; i++)
{
int thischar = asciiBytes[i];
int nextchar = asciiBytes.Length > (i + 1) ? asciiBytes[i + 1] : -1;
codes.AddRange(Code128Code.CodesForChar(thischar, nextchar, ref currcs));
}
// calculate the check digit
int checksum = (int)(codes[0]);
for (int i = 1; i < codes.Count; i++)
{
checksum += i * (int)(codes[i]);
}
codes.Add(checksum % 103);
codes.Add(Code128Code.StopCode());
int[] result = codes.ToArray(typeof(int)) as int[];
return(result);
}
/// <summary>
/// Determines the best starting code set based on the the first two
/// characters of the string to be encoded
/// </summary>
/// <param name="csa1">First character of input string</param>
/// <param name="csa2">Second character of input string</param>
/// <returns>The codeset determined to be best to start with</returns>
private CodeSet GetBestStartSet( Code128Code.CodeSetAllowed csa1, Code128Code.CodeSetAllowed csa2 )
{
int vote = 0;
vote += (csa1==Code128Code.CodeSetAllowed.CodeA) ? 1 : 0;
vote += (csa1==Code128Code.CodeSetAllowed.CodeB) ? -1 : 0;
vote += (csa2==Code128Code.CodeSetAllowed.CodeA) ? 1 : 0;
vote += (csa2==Code128Code.CodeSetAllowed.CodeB) ? -1 : 0;
return (vote>0) ? CodeSet.CodeA : CodeSet.CodeB; // ties go to codeB due to my own prejudices
}
