虽然二维码满天飞，但也不能忘了条形码，本篇介绍可以在C#中使用的1D/2D编码解码器。条形码的应用已经非常普遍，几乎所有超市里面的商品上面都印有条形码；

条形码的标准：

条形码的标准有ENA条形码、UPC条形码、二五条形码、交叉二五条形码、库德巴条形码、三九条形码和128条形码等，而商品上最常使用的就是EAN商品条形码。EAN商品条形码亦称通用商品条形码，由国际物品编码协会制定，通用于世界各地，是目前国际上使用最广泛的一种商品条形码。我国目前在国内推行使用的也是这种商品条形码。EAN商品条形码分为EAN－13（标准版）和EAN－8（缩短版）两种。以下是C#生成条形码的类库：

  1. public class BarCodeHelper
  2.     {
  3.         public class Code128
  4.         {
  5.             private readonly DataTable _mCode128 = new DataTable();
  6.             private uint _mHeight = ;
  7.  
  8.             /// <summary>
  9.             /// 高度
  10.             /// </summary>
  11.             public uint Height { get { return _mHeight; } set { _mHeight = value; } }
  12.             private Font _mValueFont;
  13.  
  14.             /// <summary>
  15.             /// 是否显示可见号码  如果为NULL不显示号码
  16.             /// </summary>
  17.             public Font ValueFont { get { return _mValueFont; } set { _mValueFont = value; } }
  18.             private byte _mMagnify;
  19.  
  20.             /// <summary>
  21.             /// 放大倍数
  22.             /// </summary>
  23.             public byte Magnify { get { return _mMagnify; } set { _mMagnify = value; } }
  24.  
  25.             /// <summary>
  26.             /// 条码类别
  27.             /// </summary>
  28.             public enum Encode
  29.             {
  30.                 Code128A,
  31.                 Code128B,
  32.                 Code128C,
  33.                 Ean128
  34.             }
  35.  
  36.             public Code128()
  37.             {
  38.                 _mCode128.Columns.Add("ID");
  39.                 _mCode128.Columns.Add("Code128A");
  40.                 _mCode128.Columns.Add("Code128B");
  41.                 _mCode128.Columns.Add("Code128C");
  42.                 _mCode128.Columns.Add("BandCode");
  43.                 _mCode128.CaseSensitive = true;
  44.                 #region 数据表
  45.                 _mCode128.Rows.Add("", " ", " ", "", "");
  46.                 _mCode128.Rows.Add("", "!", "!", "", "");
  47.                 _mCode128.Rows.Add("", "\"", "\"", "", "");
  48.                 _mCode128.Rows.Add("", "#", "#", "", "");
  49.                 _mCode128.Rows.Add("", "$", "$", "", "");
  50.                 _mCode128.Rows.Add("", "%", "%", "", "");
  51.                 _mCode128.Rows.Add("", "&", "&", "", "");
  52.                 _mCode128.Rows.Add("", "'", "'", "", "");
  53.                 _mCode128.Rows.Add("", "(", "(", "", "");
  54.                 _mCode128.Rows.Add("", ")", ")", "", "");
  55.                 _mCode128.Rows.Add("", "*", "*", "", "");
  56.                 _mCode128.Rows.Add("", "+", "+", "", "");
  57.                 _mCode128.Rows.Add("", ",", ",", "", "");
  58.                 _mCode128.Rows.Add("", "-", "-", "", "");
  59.                 _mCode128.Rows.Add("", ".", ".", "", "");
  60.                 _mCode128.Rows.Add("", "/", "/", "", "");
  61.                 _mCode128.Rows.Add("", "", "", "", "");
  62.                 _mCode128.Rows.Add("", "", "", "", "");
  63.                 _mCode128.Rows.Add("", "", "", "", "");
  64.                 _mCode128.Rows.Add("", "", "", "", "");
  65.                 _mCode128.Rows.Add("", "", "", "", "");
  66.                 _mCode128.Rows.Add("", "", "", "", "");
  67.                 _mCode128.Rows.Add("", "", "", "", "");
  68.                 _mCode128.Rows.Add("", "", "", "", "");
  69.                 _mCode128.Rows.Add("", "", "", "", "");
  70.                 _mCode128.Rows.Add("", "", "", "", "");
  71.                 _mCode128.Rows.Add("", ":", ":", "", "");
  72.                 _mCode128.Rows.Add("", ";", ";", "", "");
  73.                 _mCode128.Rows.Add("", "<", "<", "", "");
  74.                 _mCode128.Rows.Add("", "=", "=", "", "");
  75.                 _mCode128.Rows.Add("", ">", ">", "", "");
  76.                 _mCode128.Rows.Add("", "?", "?", "", "");
  77.                 _mCode128.Rows.Add("", "@", "@", "", "");
  78.                 _mCode128.Rows.Add("", "A", "A", "", "");
  79.                 _mCode128.Rows.Add("", "B", "B", "", "");
  80.                 _mCode128.Rows.Add("", "C", "C", "", "");
  81.                 _mCode128.Rows.Add("", "D", "D", "", "");
  82.                 _mCode128.Rows.Add("", "E", "E", "", "");
  83.                 _mCode128.Rows.Add("", "F", "F", "", "");
  84.                 _mCode128.Rows.Add("", "G", "G", "", "");
  85.                 _mCode128.Rows.Add("", "H", "H", "", "");
  86.                 _mCode128.Rows.Add("", "I", "I", "", "");
  87.                 _mCode128.Rows.Add("", "J", "J", "", "");
  88.                 _mCode128.Rows.Add("", "K", "K", "", "");
  89.                 _mCode128.Rows.Add("", "L", "L", "", "");
  90.                 _mCode128.Rows.Add("", "M", "M", "", "");
  91.                 _mCode128.Rows.Add("", "N", "N", "", "");
  92.                 _mCode128.Rows.Add("", "O", "O", "", "");
  93.                 _mCode128.Rows.Add("", "P", "P", "", "");
  94.                 _mCode128.Rows.Add("", "Q", "Q", "", "");
  95.                 _mCode128.Rows.Add("", "R", "R", "", "");
  96.                 _mCode128.Rows.Add("", "S", "S", "", "");
  97.                 _mCode128.Rows.Add("", "T", "T", "", "");
  98.                 _mCode128.Rows.Add("", "U", "U", "", "");
  99.                 _mCode128.Rows.Add("", "V", "V", "", "");
  100.                 _mCode128.Rows.Add("", "W", "W", "", "");
  101.                 _mCode128.Rows.Add("", "X", "X", "", "");
  102.                 _mCode128.Rows.Add("", "Y", "Y", "", "");
  103.                 _mCode128.Rows.Add("", "Z", "Z", "", "");
  104.                 _mCode128.Rows.Add("", "[", "[", "", "");
  105.                 _mCode128.Rows.Add("", "\\", "\\", "", "");
  106.                 _mCode128.Rows.Add("", "]", "]", "", "");
  107.                 _mCode128.Rows.Add("", "^", "^", "", "");
  108.                 _mCode128.Rows.Add("", "_", "_", "", "");
  109.                 _mCode128.Rows.Add("", "NUL", "`", "", "");
  110.                 _mCode128.Rows.Add("", "SOH", "a", "", "");
  111.                 _mCode128.Rows.Add("", "STX", "b", "", "");
  112.                 _mCode128.Rows.Add("", "ETX", "c", "", "");
  113.                 _mCode128.Rows.Add("", "EOT", "d", "", "");
  114.                 _mCode128.Rows.Add("", "ENQ", "e", "", "");
  115.                 _mCode128.Rows.Add("", "ACK", "f", "", "");
  116.                 _mCode128.Rows.Add("", "BEL", "g", "", "");
  117.                 _mCode128.Rows.Add("", "BS", "h", "", "");
  118.                 _mCode128.Rows.Add("", "HT", "i", "", "");
  119.                 _mCode128.Rows.Add("", "LF", "j", "", "");
  120.                 _mCode128.Rows.Add("", "VT", "k", "", "");
  121.                 _mCode128.Rows.Add("", "FF", "I", "", "");
  122.                 _mCode128.Rows.Add("", "CR", "m", "", "");
  123.                 _mCode128.Rows.Add("", "SO", "n", "", "");
  124.                 _mCode128.Rows.Add("", "SI", "o", "", "");
  125.                 _mCode128.Rows.Add("", "DLE", "p", "", "");
  126.                 _mCode128.Rows.Add("", "DC1", "q", "", "");
  127.                 _mCode128.Rows.Add("", "DC2", "r", "", "");
  128.                 _mCode128.Rows.Add("", "DC3", "s", "", "");
  129.                 _mCode128.Rows.Add("", "DC4", "t", "", "");
  130.                 _mCode128.Rows.Add("", "NAK", "u", "", "");
  131.                 _mCode128.Rows.Add("", "SYN", "v", "", "");
  132.                 _mCode128.Rows.Add("", "ETB", "w", "", "");
  133.                 _mCode128.Rows.Add("", "CAN", "x", "", "");
  134.                 _mCode128.Rows.Add("", "EM", "y", "", "");
  135.                 _mCode128.Rows.Add("", "SUB", "z", "", "");
  136.                 _mCode128.Rows.Add("", "ESC", "{", "", "");
  137.                 _mCode128.Rows.Add("", "FS", "|", "", "");
  138.                 _mCode128.Rows.Add("", "GS", "}", "", "");
  139.                 _mCode128.Rows.Add("", "RS", "~", "", "");
  140.                 _mCode128.Rows.Add("", "US", "DEL", "", "");
  141.                 _mCode128.Rows.Add("", "FNC3", "FNC3", "", "");
  142.                 _mCode128.Rows.Add("", "FNC2", "FNC2", "", "");
  143.                 _mCode128.Rows.Add("", "SHIFT", "SHIFT", "", "");
  144.                 _mCode128.Rows.Add("", "CODEC", "CODEC", "", "");
  145.                 _mCode128.Rows.Add("", "CODEB", "FNC4", "CODEB", "");
  146.                 _mCode128.Rows.Add("", "FNC4", "CODEA", "CODEA", "");
  147.                 _mCode128.Rows.Add("", "FNC1", "FNC1", "FNC1", "");
  148.                 _mCode128.Rows.Add("", "StartA", "StartA", "StartA", "");
  149.                 _mCode128.Rows.Add("", "StartB", "StartB", "StartB", "");
  150.                 _mCode128.Rows.Add("", "StartC", "StartC", "StartC", "");
  151.                 _mCode128.Rows.Add("", "Stop", "Stop", "Stop", "");
  152.                 #endregion
  153.             }
  154.  
  155.             /// <summary>
  156.             /// 获取128图形
  157.             /// </summary>
  158.             /// <param name="pText">文字</param>
  159.             /// <param name="pCode">编码</param>
  160.             /// <returns>图形</returns>
  161.             public Bitmap GetCodeImage(string pText, Encode pCode)
  162.             {
  163.                 string viewText = pText;
  164.                 string text = "";
  165.                 IList<int> textNumb = new List<int>();
  166.                 int examine;    //首位
  167.                 switch (pCode)
  168.                 {
  169.                     case Encode.Code128C:
  170.                         examine = ;
  171.                         if ((pText.Length & ) != ) throw new Exception("128C长度必须是偶数");
  172.                         while (pText.Length != )
  173.                         {
  174.                             var temp = ;
  175.                             try
  176.                             {
  177.                                 var codeNumb128 = Int32.Parse(pText.Substring(, ));
  178.                             }
  179.                             catch
  180.                             {
  181.                                 throw new Exception("128C必须是数字！");
  182.                             }
  183.                             text += GetValue(pCode, pText.Substring(, ), ref temp);
  184.                             textNumb.Add(temp);
  185.                             pText = pText.Remove(, );
  186.                         }
  187.                         break;
  188.                     case Encode.Ean128:
  189.                         examine = ;
  190.                         if ((pText.Length & ) != ) throw new Exception("EAN128长度必须是偶数");
  191.                         textNumb.Add();
  192.                         text += "";
  193.                         while (pText.Length != )
  194.                         {
  195.                             var temp = ;
  196.                             try
  197.                             {
  198.                                 var codeNumb128 = Int32.Parse(pText.Substring(, ));
  199.                             }
  200.                             catch
  201.                             {
  202.                                 throw new Exception("128C必须是数字！");
  203.                             }
  204.                             text += GetValue(Encode.Code128C, pText.Substring(, ), ref temp);
  205.                             textNumb.Add(temp);
  206.                             pText = pText.Remove(, );
  207.                         }
  208.                         break;
  209.                     default:
  210.                         examine = pCode == Encode.Code128A ?  : ;
  211.  
  212.                         while (pText.Length != )
  213.                         {
  214.                             var temp = ;
  215.                             var valueCode = GetValue(pCode, pText.Substring(, ), ref temp);
  216.                             if (valueCode.Length == ) throw new Exception("无效的字符集!" + pText.Substring(, ));
  217.                             text += valueCode;
  218.                             textNumb.Add(temp);
  219.                             pText = pText.Remove(, );
  220.                         }
  221.                         break;
  222.                 }
  223.                 if (textNumb.Count == ) throw new Exception("错误的编码,无数据");
  224.                 text = text.Insert(, GetValue(examine)); //获取开始位
  225.  
  226.                 for (int i = ; i != textNumb.Count; i++)
  227.                 {
  228.                     examine += textNumb[i] * (i + );
  229.                 }
  230.                 examine = examine % ;           //获得严效位
  231.                 text += GetValue(examine);  //获取严效位
  232.                 text += ""; //结束位
  233.                 var codeImage = GetImage(text);
  234.                 GetViewText(codeImage, viewText);
  235.                 return codeImage;
  236.             }
  237.  
  238.             /// <summary>
  239.             /// 获取目标对应的数据
  240.             /// </summary>
  241.             /// <param name="pCode">编码</param>
  242.             /// <param name="pValue">数值 A b  30</param>
  243.             /// <param name="pSetId">返回编号</param>
  244.             /// <returns>编码</returns>
  245.             private string GetValue(Encode pCode, string pValue, ref int pSetId)
  246.             {
  247.                 if (_mCode128 == null) return "";
  248.                 var row = _mCode128.Select(pCode + "='" + pValue + "'");
  249.                 if (row.Length != ) throw new Exception("错误的编码" + pValue);
  250.                 pSetId = Int32.Parse(row[]["ID"].ToString());
  251.                 return row[]["BandCode"].ToString();
  252.             }
  253.  
  254.             /// <summary>
  255.             /// 根据编号获得条纹
  256.             /// </summary>
  257.             /// <param name="pCodeId"></param>
  258.             /// <returns></returns>
  259.             private string GetValue(int pCodeId)
  260.             {
  261.                 var row = _mCode128.Select("ID='" + pCodeId + "'");
  262.                 if (row.Length != ) throw new Exception("验效位的编码错误" + pCodeId);
  263.                 return row[]["BandCode"].ToString();
  264.             }
  265.  
  266.             /// <summary>
  267.             /// 获得条码图形
  268.             /// </summary>
  269.             /// <param name="pText">文字</param>
  270.             /// <returns>图形</returns>
  271.             private Bitmap GetImage(string pText)
  272.             {
  273.                 var value = pText.ToCharArray();
  274.                 var width = ;
  275.                 for (int i = ; i != value.Length; i++)
  276.                 {
  277.                     width += Int32.Parse(value[i].ToString(CultureInfo.InvariantCulture)) * (_mMagnify + );
  278.                 }
  279.                 var codeImage = new Bitmap(width, (int)_mHeight);
  280.                 var garphics = Graphics.FromImage(codeImage);
  281.                 //Pen _Pen;
  282.                 var lenEx = ;
  283.                 for (int i = ; i != value.Length; i++)
  284.                 {
  285.                     int valueNumb = Int32.Parse(value[i].ToString(CultureInfo.InvariantCulture)) * (_mMagnify + );  //获取宽和放大系数
  286.                     garphics.FillRectangle((i & ) !=  ? Brushes.White : Brushes.Black,
  287.                         new Rectangle(lenEx, , valueNumb, (int)_mHeight));
  288.                     //_Garphics.(_Pen, new Point(_LenEx, 0), new Point(_LenEx, m_Height));
  289.                     lenEx += valueNumb;
  290.                 }
  291.                 garphics.Dispose();
  292.                 return codeImage;
  293.             }
  294.  
  295.             /// <summary>
  296.             /// 显示可见条码文字 如果小于40 不显示文字
  297.             /// </summary>
  298.             /// <param name="pBitmap">图形</param>
  299.             /// <param name="pViewText"></param>
  300.             private void GetViewText(Bitmap pBitmap, string pViewText)
  301.             {
  302.                 if (_mValueFont == null) return;
  303.  
  304.                 Graphics graphics = Graphics.FromImage(pBitmap);
  305.                 SizeF drawSize = graphics.MeasureString(pViewText, _mValueFont);
  306.                 if (drawSize.Height > pBitmap.Height -  || drawSize.Width > pBitmap.Width)
  307.                 {
  308.                     graphics.Dispose();
  309.                     return;
  310.                 }
  311.  
  312.                 int starY = pBitmap.Height - (int)drawSize.Height;
  313.                 graphics.FillRectangle(Brushes.White, new Rectangle(, starY, pBitmap.Width, (int)drawSize.Height));
  314.                 graphics.DrawString(pViewText, _mValueFont, Brushes.Black, , starY);
  315.             }
  316.  
  317.             //12345678
  318.             //(105 + (1 * 12 + 2 * 34 + 3 * 56 + 4 *78)) % 103 = 47
  319.             //结果为starc +12 +34 +56 +78 +47 +end
  320.  
  321.             internal Image GetCodeImage(string p)
  322.             {
  323.                 throw new NotImplementedException();
  324.             }
  325.         }
  326.     }

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