C# 制作条形码

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//codeusing System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Drawing.Imaging;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;using System.IO;namespace WindowsFormsApplication1{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        Bitmap b;        private void Form1_Load(object sender, EventArgs e)   //根据字符串生成二维码        {        }        /// <summary>        /// code39码 编码方案为宽度调节法 具体code39码其算法没有研究，总之每种编码方案的算法不一样        /// </summary>        /// <param name="strSource"></param>        /// <returns></returns>        private Bitmap GetCode39(string strSource)          {            int x = 5;                                              int y = 0;             int WidLength = 2;             int NarrowLength = 1;             int BarCodeHeight = 50;                   //条形码的高度            int intSourceLength = strSource.Length;            string strEncode = "010010100";             string AlphaBet = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-. $/+%*"; //Code39的字母            string[] Code39 =                 {                       /**//* 0 */ "000110100",                       /**//* 1 */ "100100001",                       /**//* 2 */ "001100001",                       /**//* 3 */ "101100000",                       /**//* 4 */ "000110001",                       /**//* 5 */ "100110000",                       /**//* 6 */ "001110000",                       /**//* 7 */ "000100101",                       /**//* 8 */ "100100100",                       /**//* 9 */ "001100100",                       /**//* A */ "100001001",                       /**//* B */ "001001001",                       /**//* C */ "101001000",                       /**//* D */ "000011001",                       /**//* E */ "100011000",                       /**//* F */ "001011000",                       /**//* G */ "000001101",                       /**//* H */ "100001100",                       /**//* I */ "001001100",                       /**//* J */ "000011100",                       /**//* K */ "100000011",                       /**//* L */ "001000011",                       /**//* M */ "101000010",                       /**//* N */ "000010011",                       /**//* O */ "100010010",                       /**//* P */ "001010010",                       /**//* Q */ "000000111",                       /**//* R */ "100000110",                       /**//* S */ "001000110",                       /**//* T */ "000010110",                       /**//* U */ "110000001",                       /**//* V */ "011000001",                       /**//* W */ "111000000",                       /**//* X */ "010010001",                       /**//* Y */ "110010000",                       /**//* Z */ "011010000",                       /**//* - */ "010000101",                       /**//* . */ "110000100",                       /**//*' '*/ "011000100",                       /**//* $ */ "010101000",                       /**//* / */ "010100010",                       /**//* + */ "010001010",                       /**//* % */ "000101010",                       /**//* * */ "010010100"                };            strSource = strSource.ToUpper();  //输入的字符全部转换成大写            Bitmap objBitmap = new Bitmap(((WidLength * 3 + NarrowLength * 7) * (intSourceLength + 2)) + (x * 2),                BarCodeHeight + (y * 2));  //指定宽度和高度            Graphics objGraphics = Graphics.FromImage(objBitmap);             objGraphics.FillRectangle(Brushes.White, 0, 0, objBitmap.Width, objBitmap.Height);            for (int i = 0; i < intSourceLength; i++)            {                if (AlphaBet.IndexOf(strSource[i]) == -1 || strSource[i] == '*')                {                    objGraphics.DrawString("含有非法字符",SystemFonts.DefaultFont, Brushes.Red, x, y);                    return objBitmap;                }                strEncode = string.Format("{0}0{1}", strEncode, Code39[AlphaBet.IndexOf(strSource[i])]);            }            strEncode = string.Format("{0}0010010100", strEncode);            int intEncodeLength = strEncode.Length;             int intBarWidth;                                                   //条形码的宽度            for (int i = 0; i < intEncodeLength; i++)             {                intBarWidth = strEncode[i] == '1' ? WidLength : NarrowLength;                objGraphics.FillRectangle(i % 2 == 0 ? Brushes.Black : Brushes.White,x, y, intBarWidth, BarCodeHeight); //                x += intBarWidth;            }            return objBitmap;        }        private void textBox1_KeyPress(object sender, KeyPressEventArgs e)        {            if(e.KeyChar==13)            {                b = GetCode39(this.textBox1.Text);                this.pictureBox1.Image=b;            }        }        private void btnSave_Click(object sender, EventArgs e)        {            SaveFileDialog savefiledialog = new SaveFileDialog();            savefiledialog.Filter = "图片格式(*.jpg)|*.jpg";            savefiledialog.Title = "保存图片";            savefiledialog.FileName = this.textBox1.Text;            if (savefiledialog.ShowDialog() == DialogResult.OK)            {                b.Save(savefiledialog.FileName,ImageFormat.Jpeg);            }        }    }}