<经验杂谈>C#生成条形码

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：

public class BarCodeHelper

    {

        public class Code128

        {

            private readonly DataTable _mCode128 = new DataTable();

            private uint _mHeight = ;

            /// <summary>

            /// 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

            }

            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("", " ", " ", "", "");

                _mCode128.Rows.Add("", "!", "!", "", "");

                _mCode128.Rows.Add("", "\"", "\"", "", "");

                _mCode128.Rows.Add("", "#", "#", "", "");

                _mCode128.Rows.Add("", "$", "$", "", "");

                _mCode128.Rows.Add("", "%", "%", "", "");

                _mCode128.Rows.Add("", "&", "&", "", "");

                _mCode128.Rows.Add("", "'", "'", "", "");

                _mCode128.Rows.Add("", "(", "(", "", "");

                _mCode128.Rows.Add("", ")", ")", "", "");

                _mCode128.Rows.Add("", "*", "*", "", "");

                _mCode128.Rows.Add("", "+", "+", "", "");

                _mCode128.Rows.Add("", ",", ",", "", "");

                _mCode128.Rows.Add("", "-", "-", "", "");

                _mCode128.Rows.Add("", ".", ".", "", "");

                _mCode128.Rows.Add("", "/", "/", "", "");

                _mCode128.Rows.Add("", "", "", "", "");

                _mCode128.Rows.Add("", "", "", "", "");

                _mCode128.Rows.Add("", "", "", "", "");

                _mCode128.Rows.Add("", "", "", "", "");

                _mCode128.Rows.Add("", "", "", "", "");

                _mCode128.Rows.Add("", "", "", "", "");

                _mCode128.Rows.Add("", "", "", "", "");

                _mCode128.Rows.Add("", "", "", "", "");

                _mCode128.Rows.Add("", "", "", "", "");

                _mCode128.Rows.Add("", "", "", "", "");

                _mCode128.Rows.Add("", ":", ":", "", "");

                _mCode128.Rows.Add("", ";", ";", "", "");

                _mCode128.Rows.Add("", "<", "<", "", "");

                _mCode128.Rows.Add("", "=", "=", "", "");

                _mCode128.Rows.Add("", ">", ">", "", "");

                _mCode128.Rows.Add("", "?", "?", "", "");

                _mCode128.Rows.Add("", "@", "@", "", "");

                _mCode128.Rows.Add("", "A", "A", "", "");

                _mCode128.Rows.Add("", "B", "B", "", "");

                _mCode128.Rows.Add("", "C", "C", "", "");

                _mCode128.Rows.Add("", "D", "D", "", "");

                _mCode128.Rows.Add("", "E", "E", "", "");

                _mCode128.Rows.Add("", "F", "F", "", "");

                _mCode128.Rows.Add("", "G", "G", "", "");

                _mCode128.Rows.Add("", "H", "H", "", "");

                _mCode128.Rows.Add("", "I", "I", "", "");

                _mCode128.Rows.Add("", "J", "J", "", "");

                _mCode128.Rows.Add("", "K", "K", "", "");

                _mCode128.Rows.Add("", "L", "L", "", "");

                _mCode128.Rows.Add("", "M", "M", "", "");

                _mCode128.Rows.Add("", "N", "N", "", "");

                _mCode128.Rows.Add("", "O", "O", "", "");

                _mCode128.Rows.Add("", "P", "P", "", "");

                _mCode128.Rows.Add("", "Q", "Q", "", "");

                _mCode128.Rows.Add("", "R", "R", "", "");

                _mCode128.Rows.Add("", "S", "S", "", "");

                _mCode128.Rows.Add("", "T", "T", "", "");

                _mCode128.Rows.Add("", "U", "U", "", "");

                _mCode128.Rows.Add("", "V", "V", "", "");

                _mCode128.Rows.Add("", "W", "W", "", "");

                _mCode128.Rows.Add("", "X", "X", "", "");

                _mCode128.Rows.Add("", "Y", "Y", "", "");

                _mCode128.Rows.Add("", "Z", "Z", "", "");

                _mCode128.Rows.Add("", "[", "[", "", "");

                _mCode128.Rows.Add("", "\\", "\\", "", "");

                _mCode128.Rows.Add("", "]", "]", "", "");

                _mCode128.Rows.Add("", "^", "^", "", "");

                _mCode128.Rows.Add("", "_", "_", "", "");

                _mCode128.Rows.Add("", "NUL", "`", "", "");

                _mCode128.Rows.Add("", "SOH", "a", "", "");

                _mCode128.Rows.Add("", "STX", "b", "", "");

                _mCode128.Rows.Add("", "ETX", "c", "", "");

                _mCode128.Rows.Add("", "EOT", "d", "", "");

                _mCode128.Rows.Add("", "ENQ", "e", "", "");

                _mCode128.Rows.Add("", "ACK", "f", "", "");

                _mCode128.Rows.Add("", "BEL", "g", "", "");

                _mCode128.Rows.Add("", "BS", "h", "", "");

                _mCode128.Rows.Add("", "HT", "i", "", "");

                _mCode128.Rows.Add("", "LF", "j", "", "");

                _mCode128.Rows.Add("", "VT", "k", "", "");

                _mCode128.Rows.Add("", "FF", "I", "", "");

                _mCode128.Rows.Add("", "CR", "m", "", "");

                _mCode128.Rows.Add("", "SO", "n", "", "");

                _mCode128.Rows.Add("", "SI", "o", "", "");

                _mCode128.Rows.Add("", "DLE", "p", "", "");

                _mCode128.Rows.Add("", "DC1", "q", "", "");

                _mCode128.Rows.Add("", "DC2", "r", "", "");

                _mCode128.Rows.Add("", "DC3", "s", "", "");

                _mCode128.Rows.Add("", "DC4", "t", "", "");

                _mCode128.Rows.Add("", "NAK", "u", "", "");

                _mCode128.Rows.Add("", "SYN", "v", "", "");

                _mCode128.Rows.Add("", "ETB", "w", "", "");

                _mCode128.Rows.Add("", "CAN", "x", "", "");

                _mCode128.Rows.Add("", "EM", "y", "", "");

                _mCode128.Rows.Add("", "SUB", "z", "", "");

                _mCode128.Rows.Add("", "ESC", "{", "", "");

                _mCode128.Rows.Add("", "FS", "|", "", "");

                _mCode128.Rows.Add("", "GS", "}", "", "");

                _mCode128.Rows.Add("", "RS", "~", "", "");

                _mCode128.Rows.Add("", "US", "DEL", "", "");

                _mCode128.Rows.Add("", "FNC3", "FNC3", "", "");

                _mCode128.Rows.Add("", "FNC2", "FNC2", "", "");

                _mCode128.Rows.Add("", "SHIFT", "SHIFT", "", "");

                _mCode128.Rows.Add("", "CODEC", "CODEC", "", "");

                _mCode128.Rows.Add("", "CODEB", "FNC4", "CODEB", "");

                _mCode128.Rows.Add("", "FNC4", "CODEA", "CODEA", "");

                _mCode128.Rows.Add("", "FNC1", "FNC1", "FNC1", "");

                _mCode128.Rows.Add("", "StartA", "StartA", "StartA", "");

                _mCode128.Rows.Add("", "StartB", "StartB", "StartB", "");

                _mCode128.Rows.Add("", "StartC", "StartC", "StartC", "");

                _mCode128.Rows.Add("", "Stop", "Stop", "Stop", "");

                #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 = ;

                        if ((pText.Length & ) != ) throw new Exception("128C长度必须是偶数");

                        while (pText.Length != )

                        {

                            var temp = ;

                            try

                            {

                                var codeNumb128 = Int32.Parse(pText.Substring(, ));

                            }

                            catch

                            {

                                throw new Exception("128C必须是数字！");

                            }

                            text += GetValue(pCode, pText.Substring(, ), ref temp);

                            textNumb.Add(temp);

                            pText = pText.Remove(, );

                        }

                        break;

                    case Encode.Ean128:

                        examine = ;

                        if ((pText.Length & ) != ) throw new Exception("EAN128长度必须是偶数");

                        textNumb.Add();

                        text += "";

                        while (pText.Length != )

                        {

                            var temp = ;

                            try

                            {

                                var codeNumb128 = Int32.Parse(pText.Substring(, ));

                            }

                            catch

                            {

                                throw new Exception("128C必须是数字！");

                            }

                            text += GetValue(Encode.Code128C, pText.Substring(, ), ref temp);

                            textNumb.Add(temp);

                            pText = pText.Remove(, );

                        }

                        break;

                    default:

                        examine = pCode == Encode.Code128A ?  : ;

                        while (pText.Length != )

                        {

                            var temp = ;

                            var valueCode = GetValue(pCode, pText.Substring(, ), ref temp);

                            if (valueCode.Length == ) throw new Exception("无效的字符集!" + pText.Substring(, ));

                            text += valueCode;

                            textNumb.Add(temp);

                            pText = pText.Remove(, );

                        }

                        break;

                }

                if (textNumb.Count == ) throw new Exception("错误的编码,无数据");

                text = text.Insert(, GetValue(examine)); //获取开始位

                for (int i = ; i != textNumb.Count; i++)

                {

                    examine += textNumb[i] * (i + );

                }

                examine = examine % ;           //获得严效位

                text += GetValue(examine);  //获取严效位

                text += ""; //结束位

                var codeImage = GetImage(text);

                GetViewText(codeImage, viewText);

                return codeImage;

            }

            /// <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 "";

                var row = _mCode128.Select(pCode + "='" + pValue + "'");

                if (row.Length != ) throw new Exception("错误的编码" + pValue);

                pSetId = Int32.Parse(row[]["ID"].ToString());

                return row[]["BandCode"].ToString();

            }

            /// <summary>

            /// 根据编号获得条纹

            /// </summary>

            /// <param name="pCodeId"></param>

            /// <returns></returns>

            private string GetValue(int pCodeId)

            {

                var row = _mCode128.Select("ID='" + pCodeId + "'");

                if (row.Length != ) throw new Exception("验效位的编码错误" + pCodeId);

                return row[]["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)

            {

                var value = pText.ToCharArray();

                var width = ;

                for (int i = ; i != value.Length; i++)

                {

                    width += Int32.Parse(value[i].ToString(CultureInfo.InvariantCulture)) * (_mMagnify + );

                }

                var codeImage = new Bitmap(width, (int)_mHeight);

                var garphics = Graphics.FromImage(codeImage);

                //Pen _Pen;

                var lenEx = ;

                for (int i = ; i != value.Length; i++)

                {

                    int valueNumb = Int32.Parse(value[i].ToString(CultureInfo.InvariantCulture)) * (_mMagnify + );  //获取宽和放大系数

                    garphics.FillRectangle((i & ) !=  ? Brushes.White : Brushes.Black,

                        new Rectangle(lenEx, , valueNumb, (int)_mHeight));

                    //_Garphics.(_Pen, new Point(_LenEx, 0), new Point(_LenEx, m_Height));

                    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 -  || drawSize.Width > pBitmap.Width)

                {

                    graphics.Dispose();

                    return;

                }

                int starY = pBitmap.Height - (int)drawSize.Height;

                graphics.FillRectangle(Brushes.White, new Rectangle(, starY, pBitmap.Width, (int)drawSize.Height));

                graphics.DrawString(pViewText, _mValueFont, Brushes.Black, , starY);

            }

            //12345678

            //(105 + (1 * 12 + 2 * 34 + 3 * 56 + 4 *78)) % 103 = 47

            //结果为starc +12 +34 +56 +78 +47 +end

            internal Image GetCodeImage(string p)

            {

                throw new NotImplementedException();

            }

        }

    }

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<经验杂谈>C#生成条形码

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