C#生成条形码 Code128算法
条形有很多种，Code128是比较常用的一种，是一种高密度条码，
- CODE128 码可表示从 ASCII 0 到ASCII 127 共128个字符，故称128码。其中包含了数字、字母和符号字符。
- Code128有三种不同的版本：A（数字、大写字母、控制字符）B（数字、大小字母、字符）C（双位数字）
- CODE128码可表示较全面的字符（数字、字母和符号），在同样长度的条码中可容纳的字符长度较长（高密度），所以应用相当广;
在网上找了一些算法，后经整理成公共的类：
/// <summary> /// 功能：一维条形码 /// 说明：采用Code128编码，BarCode128有三种不同的版本：A（数字、大写字母、控制字符）B（数字、大小字母、字符）C（双位数字） /// 创建人：
/// 创建时间:2014年4月23日 /// </summary> public class Code128 { private readonly DataTable _mCode128 = new DataTable(); private uint _mHeight = 40; /// <summary> /// 条形码高度 /// </summary> public uint Height { get { return _mHeight; } set { _mHeight = value; } } private Font _mValueFont; /// <summary> /// 是否显示可见号码 如果为NULL不显示号码 /// </summary> public Font ValueFont { get { return _mValueFont; } set { _mValueFont = value; } } private byte _mMagnify; /// <summary> /// 放大倍数 /// </summary> public byte Magnify { get { return _mMagnify; } set { _mMagnify = value; } } /// <summary> /// 条码类别 /// </summary> public enum Encode { Code128A, Code128B, Code128C, Ean128, } /// <summary> /// 构造函数 /// </summary> public Code128() { _mCode128.Columns.Add("ID"); _mCode128.Columns.Add("Code128A"); _mCode128.Columns.Add("Code128B"); _mCode128.Columns.Add("Code128C"); _mCode128.Columns.Add("BandCode"); _mCode128.CaseSensitive = true; #region 数据表 _mCode128.Rows.Add("0", " ", " ", "00", "212222"); _mCode128.Rows.Add("1", "!", "!", "01", "222122"); _mCode128.Rows.Add("2", "\"", "\"", "02", "222221"); _mCode128.Rows.Add("3", "#", "#", "03", "121223"); _mCode128.Rows.Add("4", "$", "$", "04", "121322"); _mCode128.Rows.Add("5", "%", "%", "05", "131222"); _mCode128.Rows.Add("6", "&", "&", "06", "122213"); _mCode128.Rows.Add("7", "'", "'", "07", "122312"); _mCode128.Rows.Add("8", "(", "(", "08", "132212"); _mCode128.Rows.Add("9", ")", ")", "09", "221213"); _mCode128.Rows.Add("10", "*", "*", "10", "221312"); _mCode128.Rows.Add("11", "+", "+", "11", "231212"); _mCode128.Rows.Add("12", ",", ",", "12", "112232"); _mCode128.Rows.Add("13", "-", "-", "13", "122132"); _mCode128.Rows.Add("14", ".", ".", "14", "122231"); _mCode128.Rows.Add("15", "/", "/", "15", "113222"); _mCode128.Rows.Add("16", "0", "0", "16", "123122"); _mCode128.Rows.Add("17", "1", "1", "17", "123221"); _mCode128.Rows.Add("18", "2", "2", "18", "223211"); _mCode128.Rows.Add("19", "3", "3", "19", "221132"); _mCode128.Rows.Add("20", "4", "4", "20", "221231"); _mCode128.Rows.Add("21", "5", "5", "21", "213212"); _mCode128.Rows.Add("22", "6", "6", "22", "223112"); _mCode128.Rows.Add("23", "7", "7", "23", "312131"); _mCode128.Rows.Add("24", "8", "8", "24", "311222"); _mCode128.Rows.Add("25", "9", "9", "25", "321122"); _mCode128.Rows.Add("26", ":", ":", "26", "321221"); _mCode128.Rows.Add("27", ";", ";", "27", "312212"); _mCode128.Rows.Add("28", "<", "<", "28", "322112"); _mCode128.Rows.Add("29", "=", "=", "29", "322211"); _mCode128.Rows.Add("30", ">", ">", "30", "212123"); _mCode128.Rows.Add("31", "?", "?", "31", "212321"); _mCode128.Rows.Add("32", "@", "@", "32", "232121"); _mCode128.Rows.Add("33", "A", "A", "33", "111323"); _mCode128.Rows.Add("34", "B", "B", "34", "131123"); _mCode128.Rows.Add("35", "C", "C", "35", "131321"); _mCode128.Rows.Add("36", "D", "D", "36", "112313"); _mCode128.Rows.Add("37", "E", "E", "37", "132113"); _mCode128.Rows.Add("38", "F", "F", "38", "132311"); _mCode128.Rows.Add("39", "G", "G", "39", "211313"); _mCode128.Rows.Add("40", "H", "H", "40", "231113"); _mCode128.Rows.Add("41", "I", "I", "41", "231311"); _mCode128.Rows.Add("42", "J", "J", "42", "112133"); _mCode128.Rows.Add("43", "K", "K", "43", "112331"); _mCode128.Rows.Add("44", "L", "L", "44", "132131"); _mCode128.Rows.Add("45", "M", "M", "45", "113123"); _mCode128.Rows.Add("46", "N", "N", "46", "113321"); _mCode128.Rows.Add("47", "O", "O", "47", "133121"); _mCode128.Rows.Add("48", "P", "P", "48", "313121"); _mCode128.Rows.Add("49", "Q", "Q", "49", "211331"); _mCode128.Rows.Add("50", "R", "R", "50", "231131"); _mCode128.Rows.Add("51", "S", "S", "51", "213113"); _mCode128.Rows.Add("52", "T", "T", "52", "213311"); _mCode128.Rows.Add("53", "U", "U", "53", "213131"); _mCode128.Rows.Add("54", "V", "V", "54", "311123"); _mCode128.Rows.Add("55", "W", "W", "55", "311321"); _mCode128.Rows.Add("56", "X", "X", "56", "331121"); _mCode128.Rows.Add("57", "Y", "Y", "57", "312113"); _mCode128.Rows.Add("58", "Z", "Z", "58", "312311"); _mCode128.Rows.Add("59", "[", "[", "59", "332111"); _mCode128.Rows.Add("60", "\\", "\\", "60", "314111"); _mCode128.Rows.Add("61", "]", "]", "61", "221411"); _mCode128.Rows.Add("62", "^", "^", "62", "431111"); _mCode128.Rows.Add("63", "_", "_", "63", "111224"); _mCode128.Rows.Add("64", "NUL", "`", "64", "111422"); _mCode128.Rows.Add("65", "SOH", "a", "65", "121124"); _mCode128.Rows.Add("66", "STX", "b", "66", "121421"); _mCode128.Rows.Add("67", "ETX", "c", "67", "141122"); _mCode128.Rows.Add("68", "EOT", "d", "68", "141221"); _mCode128.Rows.Add("69", "ENQ", "e", "69", "112214"); _mCode128.Rows.Add("70", "ACK", "f", "70", "112412"); _mCode128.Rows.Add("71", "BEL", "g", "71", "122114"); _mCode128.Rows.Add("72", "BS", "h", "72", "122411"); _mCode128.Rows.Add("73", "HT", "i", "73", "142112"); _mCode128.Rows.Add("74", "LF", "j", "74", "142211"); _mCode128.Rows.Add("75", "VT", "k", "75", "241211"); _mCode128.Rows.Add("76", "FF", "I", "76", "221114"); _mCode128.Rows.Add("77", "CR", "m", "77", "413111"); _mCode128.Rows.Add("78", "SO", "n", "78", "241112"); _mCode128.Rows.Add("79", "SI", "o", "79", "134111"); _mCode128.Rows.Add("80", "DLE", "p", "80", "111242"); _mCode128.Rows.Add("81", "DC1", "q", "81", "121142"); _mCode128.Rows.Add("82", "DC2", "r", "82", "121241"); _mCode128.Rows.Add("83", "DC3", "s", "83", "114212"); _mCode128.Rows.Add("84", "DC4", "t", "84", "124112"); _mCode128.Rows.Add("85", "NAK", "u", "85", "124211"); _mCode128.Rows.Add("86", "SYN", "v", "86", "411212"); _mCode128.Rows.Add("87", "ETB", "w", "87", "421112"); _mCode128.Rows.Add("88", "CAN", "x", "88", "421211"); _mCode128.Rows.Add("89", "EM", "y", "89", "212141"); _mCode128.Rows.Add("90", "SUB", "z", "90", "214121"); _mCode128.Rows.Add("91", "ESC", "{", "91", "412121"); _mCode128.Rows.Add("92", "FS", "|", "92", "111143"); _mCode128.Rows.Add("93", "GS", "}", "93", "111341"); _mCode128.Rows.Add("94", "RS", "~", "94", "131141"); _mCode128.Rows.Add("95", "US", "DEL", "95", "114113"); _mCode128.Rows.Add("96", "FNC3", "FNC3", "96", "114311"); _mCode128.Rows.Add("97", "FNC2", "FNC2", "97", "411113"); _mCode128.Rows.Add("98", "SHIFT", "SHIFT", "98", "411311"); _mCode128.Rows.Add("99", "CODEC", "CODEC", "99", "113141"); _mCode128.Rows.Add("100", "CODEB", "FNC4", "CODEB", "114131"); _mCode128.Rows.Add("101", "FNC4", "CODEA", "CODEA", "311141"); _mCode128.Rows.Add("102", "FNC1", "FNC1", "FNC1", "411131"); _mCode128.Rows.Add("103", "StartA", "StartA", "StartA", "211412"); _mCode128.Rows.Add("104", "StartB", "StartB", "StartB", "211214"); _mCode128.Rows.Add("105", "StartC", "StartC", "StartC", "211232"); _mCode128.Rows.Add("106", "Stop", "Stop", "Stop", "2331112"); #endregion } /// <summary> /// 获取128图形 /// </summary> /// <param name="pText">文字</param> /// <param name="pCode">编码</param> /// <returns>图形</returns> public Bitmap GetCodeImage(string pText, Encode pCode) { string viewText = pText; string text = ""; IList<int> textNumb = new List<int>(); int examine; //首位 switch (pCode) { case Encode.Code128C: examine = 105; if (!((pText.Length & 1) == 0)) throw new Exception("128C长度必须是偶数"); while (pText.Length != 0) { int temp = 0; try { Int32.Parse(pText.Substring(0, 2)); } catch { throw new Exception("128C必须是数字！"); } text += GetValue(pCode, pText.Substring(0, 2), ref temp); textNumb.Add(temp); pText = pText.Remove(0, 2); } break; case Encode.Ean128: examine = 105; if (!((pText.Length & 1) == 0)) throw new Exception("EAN128长度必须是偶数"); textNumb.Add(102); text += "411131"; while (pText.Length != 0) { int temp = 0; try { Int32.Parse(pText.Substring(0, 2)); } catch { throw new Exception("128C必须是数字！"); } text += GetValue(Encode.Code128C, pText.Substring(0, 2), ref temp); textNumb.Add(temp); pText = pText.Remove(0, 2); } break; default: if (pCode == Encode.Code128A) { examine = 103; } else { examine = 104; } while (pText.Length != 0) { int temp = 0; string valueCode = GetValue(pCode, pText.Substring(0, 1), ref temp); if (valueCode.Length == 0) throw new Exception("无效的字符集!" + pText.Substring(0, 1)); text += valueCode; textNumb.Add(temp); pText = pText.Remove(0, 1); } break; } if (textNumb.Count == 0) throw new Exception("错误的编码,无数据"); text = text.Insert(0, GetValue(examine)); //获取开始位 for (int i = 0; i != textNumb.Count; i++) { examine += textNumb[i] * (i + 1); } examine = examine % 103; //获得严效位 text += GetValue(examine); //获取严效位 text += "2331112"; //结束位 Bitmap codeImage = GetImage(text); GetViewText(codeImage, viewText); return codeImage; } /// <summary> /// 保存条形码到指定的路径 /// </summary> /// <param name="pText">待转换的条码</param> /// <param name="pCode">编译类型</param> /// <param name="path">条码保存路径</param> /// <param name="font">字体,默认20号宋体</param> /// <param name="imgFormat">图片格式，默认为Gif</param> public void SaveImage(string pText, Encode pCode, string path, Font font, ImageFormat imgFormat) { ValueFont = font ?? new Font("宋体", 20); ImageFormat format = imgFormat ?? ImageFormat.Gif; Bitmap mBitmap = GetCodeImage(pText, pCode); //保存到磁盘 mBitmap.Save(path, format); } /// <summary> /// 获取条形码BitmapSource /// </summary> /// <param name="pText">待转换的条码</param> /// <param name="pCode">编译类型</param> /// <param name="font">字体,默认20号宋体</param> /// <returns>BitmapSource</returns> public BitmapSource GetCodeBitmapSource(string pText, Encode pCode, Font font) { ValueFont = font ?? new Font("宋体", 20); Bitmap mBitmap = GetCodeImage(pText, pCode); IntPtr ip = mBitmap.GetHbitmap(); BitmapSource bitmapSource = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap( ip, IntPtr.Zero, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions()); DeleteObject(ip); return bitmapSource; } [DllImport("gdi32")] static extern int DeleteObject(IntPtr o); /// <summary> /// 获取目标对应的数据 /// </summary> /// <param name="pCode">编码</param> /// <param name="pValue">数值 A b 30</param> /// <param name="pSetID">返回编号</param> /// <returns>编码</returns> private string GetValue(Encode pCode, string pValue, ref int pSetID) { if (_mCode128 == null) return ""; DataRow[] row = _mCode128.Select(pCode.ToString() + "='" + pValue + "'"); if (row.Length != 1) throw new Exception("错误的编码" + pValue); pSetID = Int32.Parse(row[0]["ID"].ToString()); return row[0]["BandCode"].ToString(); } /// <summary> /// 根据编号获得条纹 /// </summary> /// <param name="pCodeId"></param> /// <returns></returns> private string GetValue(int pCodeId) { DataRow[] row = _mCode128.Select("ID='" + pCodeId + "'"); if (row.Length != 1) throw new Exception("验效位的编码错误" + pCodeId); return row[0]["BandCode"].ToString(); } /// <summary> /// 获得条码图形 /// </summary> /// <param name="pText">文字</param> /// <returns>图形</returns> private Bitmap GetImage(string pText) { char[] value = pText.ToCharArray(); int width = 0; for (int i = 0; i != value.Length; i++) { width += Int32.Parse(value[i].ToString()) * (_mMagnify + 1); } Bitmap codeImage = new Bitmap(width, (int)_mHeight); Graphics garphics = Graphics.FromImage(codeImage); //Pen _Pen; int lenEx = 0; for (int i = 0; i != value.Length; i++) { int valueNumb = Int32.Parse(value[i].ToString()) * (_mMagnify + 1); //获取宽和放大系数 if (!((i & 1) == 0)) { garphics.FillRectangle(Brushes.White, new Rectangle(lenEx, 0, valueNumb, (int)_mHeight)); } else { garphics.FillRectangle(Brushes.Black, new Rectangle(lenEx, 0, valueNumb, (int)_mHeight)); } lenEx += valueNumb; } garphics.Dispose(); return codeImage; } /// <summary> /// 显示可见条码文字 如果小于40 不显示文字 /// </summary> /// <param name="pBitmap">图形</param> /// <param name="pViewText"></param> private void GetViewText(Bitmap pBitmap, string pViewText) { if (_mValueFont == null) return; Graphics graphics = Graphics.FromImage(pBitmap); SizeF drawSize = graphics.MeasureString(pViewText, _mValueFont); if (drawSize.Height > pBitmap.Height - 10 || drawSize.Width > pBitmap.Width) { graphics.Dispose(); return; } int starY = pBitmap.Height - (int)drawSize.Height; graphics.FillRectangle(Brushes.White, new Rectangle(0, starY, pBitmap.Width, (int)drawSize.Height)); graphics.DrawString(pViewText, _mValueFont, Brushes.Black, 0, starY); } internal Image GetCodeImage(string p) { throw new NotImplementedException(); } }
该类中的方法可以获取指定条码的图片，也可保存到指定的路径下，由于的我项目是WPF的，所以还提供了一个返回BitmapSource的方法。
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