1、打开vs新建一个项目，在项目中添加一个网站并增加一个aspx为扩展名的文件。
2、在文件中拖动动件，如下吐
3、 <table> <tr> <td height="24px" colspan="2" bgcolor="#d0e1e9"> <span style="color: #4073B6; margin-left: 10px" runat="server" id="span1"><strong>图书管理-条码打印预览</strong></span> </td> </tr> <tr> <td align="center"> <input id="btnPrint" type="button" value="打印" /> </td> </tr> <tr> <td> <div id="printContent"> <asp:Image runat="server" Width="80%" ID="imgNo" /> </div> </td> </tr> </table>
4、创建一个类，这个类处理条形码的生成。详细代码如下：using System;using System.Collections;using System.ComponentModel;using System.Drawing;using System.Data;namespace Book.Common{ /// <summary> /// Code39编码 /// </summary> public class Code39 { private Hashtable m_Code39 = new Hashtable(); private byte m_Magnify = 0; /// <summary> /// 放大倍数 /// </summary> public byte Magnify { get { return m_Magnify; } set { m_Magnify = value; } } private int m_Height = 40; /// <summary> /// 图形高 /// </summary> public int Height { get { return m_Height; } set { m_Height = value; } } private Font m_ViewFont = null; /// <summary> /// 字体大小 /// </summary> public Font ViewFont { get { return m_ViewFont; } set { m_ViewFont = value; } } public Code39() { m_Code39.Add("A", "1101010010110"); m_Code39.Add("B", "1011010010110"); m_Code39.Add("C", "1101101001010"); m_Code39.Add("D", "1010110010110"); m_Code39.Add("E", "1101011001010"); m_Code39.Add("F", "1011011001010"); m_Code39.Add("G", "1010100110110"); m_Code39.Add("H", "1101010011010"); m_Code39.Add("I", "1011010011010"); m_Code39.Add("J", "1010110011010"); m_Code39.Add("K", "1101010100110"); m_Code39.Add("L", "1011010100110"); m_Code39.Add("M", "1101101010010"); m_Code39.Add("N", "1010110100110"); m_Code39.Add("O", "1101011010010"); m_Code39.Add("P", "1011011010010"); m_Code39.Add("Q", "1010101100110"); m_Code39.Add("R", "1101010110010"); m_Code39.Add("S", "1011010110010"); m_Code39.Add("T", "1010110110010"); m_Code39.Add("U", "1100101010110"); m_Code39.Add("V", "1001101010110"); m_Code39.Add("W", "1100110101010"); m_Code39.Add("X", "1001011010110"); m_Code39.Add("Y", "1100101101010"); m_Code39.Add("Z", "1001101101010"); m_Code39.Add("0", "1010011011010"); m_Code39.Add("1", "1101001010110"); m_Code39.Add("2", "1011001010110"); m_Code39.Add("3", "1101100101010"); m_Code39.Add("4", "1010011010110"); m_Code39.Add("5", "1101001101010"); m_Code39.Add("6", "1011001101010"); m_Code39.Add("7", "1010010110110"); m_Code39.Add("8", "1101001011010"); m_Code39.Add("9", "1011001011010"); m_Code39.Add("+", "1001010010010"); m_Code39.Add("-", "1001010110110"); m_Code39.Add("*", "1001011011010"); m_Code39.Add("/", "1001001010010"); m_Code39.Add("%", "1010010010010"); m_Code39.Add("contentquot;", "1001001001010"); m_Code39.Add(".", "1100101011010"); m_Code39.Add(" ", "1001101011010"); } public enum Code39Model { /// <summary> /// 基本类别 1234567890ABC /// </summary> Code39Normal, /// <summary> /// 全ASCII方式 +A+B 来表示小写 /// </summary> Code39FullAscII } /// <summary> /// 获得条码图形 /// </summary> /// <param name="p_Text">文字信息</param> /// <param name="p_Model">类别</param> /// <param name="p_StarChar">是否增加前后*号</param> /// <returns>图形</returns> public Bitmap GetCodeImage(string p_Text, Code39Model p_Model, bool p_StarChar) { string _ValueText = ""; string _CodeText = ""; char[] _ValueChar = null; switch (p_Model) { case Code39Model.Code39Normal: _ValueText = p_Text.ToUpper(); break; default: _ValueChar = p_Text.ToCharArray(); for (int i = 0; i != _ValueChar.Length; i++) { if ((int)_ValueChar[i] >= 97 && (int)_ValueChar[i] <= 122) { _ValueText += "+" + _ValueChar[i].ToString().ToUpper(); } else { _ValueText += _ValueChar[i].ToString(); } } break; } _ValueChar = _ValueText.ToCharArray(); if (p_StarChar == true) _CodeText += m_Code39["*"]; for (int i = 0; i != _ValueChar.Length; i++) { if (p_StarChar == true && _ValueChar[i] == '*') throw new Exception("带有起始符号不能出现*"); object _CharCode = m_Code39[_ValueChar[i].ToString()]; if (_CharCode == null) throw new Exception("不可用的字符" + _ValueChar[i].ToString()); _CodeText += _CharCode.ToString(); } if (p_StarChar == true) _CodeText += m_Code39["*"]; Bitmap _CodeBmp = GetImage(_CodeText); GetViewImage(_CodeBmp, p_Text); return _CodeBmp; } /// <summary> /// 绘制编码图形 /// </summary> /// <param name="p_Text">编码</param> /// <returns>图形</returns> private Bitmap GetImage(string p_Text) { char[] _Value = p_Text.ToCharArray(); //宽 == 需要绘制的数量*放大倍数 + 两个字的宽 Bitmap _CodeImage = new Bitmap(_Value.Length * ((int)m_Magnify + 1), (int)m_Height); Graphics _Garphics = Graphics.FromImage(_CodeImage); _Garphics.FillRectangle(Brushes.White, new Rectangle(0, 0, _CodeImage.Width, _CodeImage.Height)); int _LenEx = 0; for (int i = 0; i != _Value.Length; i++) { int _DrawWidth = m_Magnify + 1; if (_Value[i] == '1') { _Garphics.FillRectangle(Brushes.Black, new Rectangle(_LenEx, 0, _DrawWidth, m_Height)); } else { _Garphics.FillRectangle(Brushes.White, new Rectangle(_LenEx, 0, _DrawWidth, m_Height)); } _LenEx += _DrawWidth; } _Garphics.Dispose(); return _CodeImage; } /// <summary> /// 绘制文字 /// </summary> /// <param name="p_CodeImage">图形</param> /// <param name="p_Text">文字</param> private void GetViewImage(Bitmap p_CodeImage, string p_Text) { if (m_ViewFont == null) return; Graphics _Graphics = Graphics.FromImage(p_CodeImage); SizeF _FontSize = _Graphics.MeasureString(p_Text, m_ViewFont); if (_FontSize.Width > p_CodeImage.Width || _FontSize.Height > p_CodeImage.Height - 20) { _Graphics.Dispose(); return; } int _StarHeight = p_CodeImage.Height - (int)_FontSize.Height; _Graphics.FillRectangle(Brushes.White, new Rectangle(0, _StarHeight, p_CodeImage.Width, (int)_FontSize.Height)); int _StarWidth = (p_CodeImage.Width - (int)_FontSize.Width) / 2; _Graphics.DrawString(p_Text, m_ViewFont, Brushes.Black, _StarWidth, _StarHeight); _Graphics.Dispose(); } }}
5、引入图形处理命名空间
6、上面完成后，让我们回到aspx后台程序里面，在里增加处理方法生成条形码。private void Prin(string No) { Code39 _Code39 = new Code39(); _Code39.Height = 100; _Code39.Magnify = 1; _Code39.ViewFont = new Font("宋体", 20); System.Drawing.Image _CodeImage = _Code39.GetCodeImage(No, Code39.Code39Model.Code39Normal, true); System.IO.MemoryStream _Stream = new System.IO.MemoryStream(); _CodeImage.Save(_Stream, System.Drawing.Imaging.ImageFormat.Jpeg); string path = Server.HtmlEncode(Request.PhysicalApplicationPath) + "\\Print\\" + No + ".jpeg"; _CodeImage.Save(path.Replace("\\\\", "\\")); imgNo.ImageUrl = string.Format(@"~/Print/{0}.jpeg", No); }上面的方法是根据传入的参数调用Code39进行条码生成
7、最后一步，运行程序，在程序中看最后效果。
8、到这里基本上已经完了，可以用微信或其它设备扫描就能识别出条形码的内容来。
