关于条码的生成方法,Jeet知道的有三种方法:
一、是使用现成的控件,网上可以找到相关的厂商,价格从1K到3K不等,可以支持Winform和Webform的应用,Web上基本都是生成对应的图形输出;
二、是使用条码字体,把要显示的条形码用条码字体显示出来,具体可以参考Codeproject上这个示例(C# Barcode Generator WebService),这个示例是WebService,要在Webform上使用只需要把结果输出成图形就可以,不过用Code3 free of 9打印出来的条码我的数据采集器并不能很好的读取,所以最后也放弃了这种做法。
三、自己编程输出条码,其实条码只是按不同的符号粗细画出来,只要知道规律就可以把不同编码规则的条码画出来。在Web上应用可以重写HttpHandler,把结果输入到图形上,加上相应的参数,就可以按自己的要求动态生成条码了。在网上也有生成Code39编码的资源,ASP.NET下生成的条形码,经过试验扫描枪可以很好的读到条码上的信息。
但如果要使用例如Code128就没有办法了,还是得自己解决了。
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using System;
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using System.Collections.Generic;
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using System.Text;
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using System.Data;
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using System.Drawing;
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using System.Drawing.Drawing2D;
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namespace LabelKit
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{
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class BarcodeGenerator
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{
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public BarcodeGenerator()
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{
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width = 300;
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height = 60;
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humanReadable = true;
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fontSize = 12;
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fontName = "Courier New";
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centered = false;
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}
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private int height;
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private bool humanReadable;
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private int width;
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private string fontName;
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private int fontSize;
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private bool centered;
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private static string[] left_UPCA = new string[] {"0001101", "0011001", "0010011", "0111101", "0100011",
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"0110001", "0101111", "0111011" , "0110111", "0001011"};
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private static string[] right_UPCA = new string[] {"1110010", "1100110", "1101100", "1000010", "1011100",
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"1001110", "1010000", "1000100", "1001000", "1110100"}; //1s compliment of left odd
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private static string[] both_2of5 = new string[] { "NNWWN", "WNNNW", "NWNNW", "WWNNN", "NNWNW", "WNWNN",
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"NWWNN", "NNNWW", "WNNWN", "NWNWN" };
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private static char[] Code128ComboAB = new char[] {
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' ', '!', '"', '#', '$', '%', '&', '\'', '(', ')', '*',
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'+', ',', '-', '.', '/', '0', '1', '2', '3', '4', '5',
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'6', '7', '8', '9', ':', ';', '<', '=', '>', '?', '@',
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'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K',
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'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V',
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'W', 'X', 'Y', 'Z', '[', '\\', ']', '^', '_'
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};
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private static char[] Code128B = new char[] {
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'`', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j',
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'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u',
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'v', 'w', 'x', 'y', 'z', '{', '|', '}', '~'
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};
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private static string[] Code128Encoding = new string[] {
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"11011001100", "11001101100", "11001100110", "10010011000", "10010001100", "10001001100", "10011001000",
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"10011000100", "10001100100", "11001001000", "11001000100", "11000100100", "10110011100", "10011011100",
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"10011001110", "10111001100", "10011101100", "10011100110", "11001110010", "11001011100", "11001001110",
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"11011100100", "11001110100", "11101101110", "11101001100", "11100101100", "11100100110", "11101100100",
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"11100110100", "11100110010", "11011011000", "11011000110", "11000110110", "10100011000", "10001011000",
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"10001000110", "10110001000", "10001101000", "10001100010", "11010001000", "11000101000", "11000100010",
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"10110111000", "10110001110", "10001101110", "10111011000", "10111000110", "10001110110", "11101110110",
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"11010001110", "11000101110", "11011101000", "11011100010", "11011101110", "11101011000", "11101000110",
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"11100010110", "11101101000", "11101100010", "11100011010", "11101111010", "11001000010", "11110001010",
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"10100110000", "10100001100", "10010110000", "10010000110", "10000101100", "10000100110", "10110010000",
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"10110000100", "10011010000", "10011000010", "10000110100", "10000110010", "11000010010", "11001010000",
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"11110111010", "11000010100", "10001111010", "10100111100", "10010111100", "10010011110", "10111100100",
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"10011110100", "10011110010", "11110100100", "11110010100", "11110010010", "11011011110", "11011110110",
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"11110110110", "10101111000", "10100011110", "10001011110", "10111101000", "10111100010", "11110101000",
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"11110100010", "10111011110", "10111101110", "11101011110", "11110101110", "11010000100", "11010010000",
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"11010011100"
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};
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private static string Code128Stop = "11000111010";
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private enum Code128ChangeModes { CodeA = 101, CodeB = 100, CodeC = 99 };
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private enum Code128StartModes { CodeUnset = 0, CodeA = 103, CodeB = 104, CodeC = 105};
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private enum Code128Modes { CodeUnset = 0, CodeA = 1, CodeB = 2, CodeC = 3 };
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Public Properties
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public string DrawUPCA(Graphics g, string code, int x, int y)
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{
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code = code.Trim();
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try
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{
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Int64.Parse(code); // this ensures that the string is a number
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}
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catch
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{
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return "Code is not valid for a UPCA barcode: " + code;
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}
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while(code.Length < 11) // 11 is the length for upc-a barcodes;
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code = "0" + code;
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code = code.Substring(0, 11);
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code = code.Trim() + CheckDigitUPCA(code);
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string barbit = "101"; //START
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for(int i = 0; i < 6; i++) // first 6 Digits
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{
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int digit = Int32.Parse(code.Substring(i, 1));
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barbit += left_UPCA[digit];
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}
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barbit += "01010"; //CENTER
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for(int i = 6; i < 12; i++) // last 5 Digits + Check Digit
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{
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int digit = Int32.Parse(code.Substring(i, 1));
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barbit += right_UPCA[digit];
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}
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barbit += "101"; //END
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Font font = new Font(fontName, fontSize, FontStyle.Bold);
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SizeF size = g.MeasureString(code.Substring(0, 1), font);
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int padding = 0;
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if(humanReadable)
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padding = (int)size.Width + 2;
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int barwidth = (int) Math.Floor((double) (width - 2 * padding) / barbit.Length);
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if(barwidth <= 0)
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barwidth = 1;
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if(centered)
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{
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x = (int)x - (((barwidth * 95) + 2 * padding) / 2);
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}
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int start = x + padding;
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for(int i = 1; i <= barbit.Length; i++)
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{
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string bit = barbit.Substring(i-1, 1);
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if (bit == "0")
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{
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g.FillRectangle(Brushes.White, start, y, barwidth, height);
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}
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else // bit == "1"
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{
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g.FillRectangle(Brushes.Black, start, y, barwidth, height);
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}
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start += barwidth;
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}
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g.FillRectangle(Brushes.White, x, y + height - 8, width, 8);
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if(humanReadable)
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{
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g.FillRectangle(Brushes.White, x + padding + ((barwidth) * 10), y + height - 20, barwidth * 36, 20);
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g.FillRectangle(Brushes.White, x + padding + ((barwidth) * 49), y + height - 20, barwidth * 36, 20);
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g.DrawString(code.Substring(0, 1), font, Brushes.Black, x + 2, y + height - font.Height);
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int spacing = (int)((barwidth * 36) / 5);
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for(int i = 1; i < 6; i++)
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{
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g.DrawString(code.Substring(i, 1), font, Brushes.Black, x + (barwidth * 10) + padding + (spacing * (i - 1)), y + height - font.Height);
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}
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for(int i = 6; i < 11; i++)
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{
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g.DrawString(code.Substring(i, 1), font, Brushes.Black, x + (barwidth * 49) + padding + (spacing * (i - 6)), y + height - font.Height);
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}
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g.DrawString(code.Substring(11, 1), font, Brushes.Black, x + ((barwidth) * 95) + padding, y + height - font.Height);
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}
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return "";
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}
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private string CheckDigitUPCA(string code)
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{
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int odd = 0;
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int even = 0;
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for(int i = 0; i < code.Length; i += 2)
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odd += Int32.Parse(code.Substring(i, 1));
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for(int i = 1; i < code.Length; i += 2)
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even += Int32.Parse(code.Substring(i, 1));
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int check = (10 - ((odd * 3) + even) % 10) % 10;
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return check.ToString().Trim();
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}
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public string DrawInterleaved2of5(Graphics g, string code, int x, int y)
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{
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return DrawInterleaved2of5(g, code, x, y, false);
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}
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public string DrawInterleaved2of5(Graphics g, string code, int x, int y, bool checksum)
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{
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code = code.Trim();
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try
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{
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Int64.Parse(code); // this ensures that the string is a number
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}
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catch
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{
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return "Code is not valid for an Interleaved 2 of 5 barcode: " + code;
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}
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if((checksum && IsEven(code.Length)) || (!checksum && IsOdd(code.Length))) // check to make sure that the number of digits is even
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code = "0" + code;
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if(checksum)
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code = code + CheckDigitInterleaved(code);
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string barbit = "1010"; //START
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for(int i = 0; i < code.Length; i++)
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{
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int digitb = Int32.Parse(code.Substring(i, 1));
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string black = both_2of5[digitb];
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i++;
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int digitw = Int32.Parse(code.Substring(i, 1));
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string white = both_2of5[digitw];
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for(int j = 0; j < 5; j++) // 5 is the width of all interleaved symbologies
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{
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if(black[j] == 'W')
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barbit += "11";
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else
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barbit += "1";
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if(white[j] == 'W')
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barbit += "00";
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else
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barbit += "0";
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}
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}
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barbit += "1101"; //END
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Font font = new Font(fontName, fontSize, FontStyle.Bold);
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SizeF size = g.MeasureString(code.Substring(0, 1), font);
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int padding = 0;
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if(humanReadable)
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padding = (int)size.Width + 2;
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int barwidth = (int)Math.Floor((double)(width - 2 * padding) / barbit.Length);
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if(barwidth <= 0)
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barwidth = 1;
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if(centered)
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{
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x = (int)x - (((barwidth * barbit.Length) + 2 * padding) / 2);
267
}
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int start = x + padding;
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for(int i = 1; i <= barbit.Length; i++)
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{
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string bit = barbit.Substring(i - 1, 1);
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if(bit == "0")
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{
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g.FillRectangle(Brushes.White, start, y, barwidth, height);
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}
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else // bit == "1"
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{
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g.FillRectangle(Brushes.Black, start, y, barwidth, height);
279
}
280
start += barwidth;
281
}
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if(humanReadable)
284
{
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int spacing = (int)((barwidth * 36) / 5);
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for(int i = 0; i < code.Length; i++)
287
{
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g.DrawString(code.Substring(i, 1), font, Brushes.Black, x + (barwidth * 10) + padding + (spacing * (i - 1)), y + height + 4);
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}
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}
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return "";
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}
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private string CheckDigitInterleaved(string code)
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{
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int odd = 0;
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int even = 0;
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for(int i = 0; i < code.Length; i += 2)
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even += Int32.Parse(code.Substring(i, 1));
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for(int i = 1; i < code.Length; i += 2)
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odd += Int32.Parse(code.Substring(i, 1));
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int check = (10 - ((odd * 3) + even) % 10) % 10;
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return check.ToString().Trim();
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}
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public string DrawCode128(Graphics g, string code, int x, int y)
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{
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if(code.Length == 0)
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return "Invalid code for Code128 barcode";
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List<int> encoded = new List<int>();
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Code128Modes currentMode = Code128Modes.CodeUnset;
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for(int i = 0; i < code.Length; i++)
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{
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if(IsNumber(code[i]) && i + 1 < code.Length && IsNumber(code[i + 1]))
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{
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if(currentMode != Code128Modes.CodeC)
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{
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if(currentMode == Code128Modes.CodeUnset)
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encoded.Add((int) Code128StartModes.CodeC);
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else
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encoded.Add((int) Code128ChangeModes.CodeC);
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currentMode = Code128Modes.CodeC;
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}
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encoded.Add(Int32.Parse(code.Substring(i, 2)));
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i++;
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}
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else
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{
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if(currentMode != Code128Modes.CodeB)
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{
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if(currentMode == Code128Modes.CodeUnset)
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encoded.Add((int) Code128StartModes.CodeB);
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else
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encoded.Add((int) Code128ChangeModes.CodeB);
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currentMode = Code128Modes.CodeB;
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}
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encoded.Add(EncodeCodeB(code[i]));
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}
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}
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encoded.Add(CheckDigitCode128(encoded));
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string barbit = "";
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for(int i = 0; i < encoded.Count; i++)
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{
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barbit += Code128Encoding[encoded[i]];
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}
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barbit += Code128Stop;
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barbit += "11"; // end code
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int barwidth = (int)Math.Floor((double)(width - 2) / (barbit.Length + 20)); // add 20 for padding
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if(barwidth <= 0)
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barwidth = 1;
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int padding = barwidth * 10;
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if(centered)
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{
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x = (int)x - (((barwidth * barbit.Length) + (padding * 2)) / 2);
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}
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int start = x + padding;
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for(int i = 1; i <= barbit.Length; i++)
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{
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string bit = barbit.Substring(i - 1, 1);
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if(bit == "0")
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{
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g.FillRectangle(Brushes.White, start, y, barwidth, height);
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}
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else // bit == "1"
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{
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g.FillRectangle(Brushes.Black, start, y, barwidth, height);
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}
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start += barwidth;
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}
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if(humanReadable)
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{
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Font font = new Font(fontName, fontSize, FontStyle.Bold);
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SizeF size = g.MeasureString(code, font);
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x = x + (int)((barwidth * barbit.Length) + (padding * 2)) / 2;
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x -= (int) size.Width / 2;
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g.DrawString(code, font, Brushes.Black, x, y + height + 4);
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}
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return "";
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}
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private int CheckDigitCode128(List<int> codes)
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{
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int check = codes[0];
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for(int i = 1; i < codes.Count; i++)
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{
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check = check + (codes[i] * i);
400
}
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return check % 103;
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}
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private bool IsNumber(char value)
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{
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return '0' == value || '1' == value || '2' == value || '3' == value ||
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'4' == value || '5' == value || '6' == value || '7' == value ||
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'8' == value || '9' == value;
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}
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private bool IsEven(int value)
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{
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return ((value & 1) == 0);
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}
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private bool IsOdd(int value)
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{
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return ((value & 1) == 1);
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}
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private int EncodeCodeB(char value)
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{
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for(int i = 0; i < Code128ComboAB.Length; i++)
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{
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if(Code128ComboAB[i] == value)
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return i;
428
}
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for(int i = 0; i < Code128B.Length; i++)
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{
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if(Code128B[i] == value)
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return i + Code128ComboAB.Length;
433
}
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throw new Exception("Invalid Character");
435
}
436
}
437
}
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