开发学院 WEB开发 ASP.NET 巧妙利用ASP.net生成漂亮的条形码阅读

巧妙利用ASP.net生成漂亮的条形码

　2010-10-16 15:52:46　来源：WEB开发网　　　

核心提示：C#实现Code39条形码在线输出(Asp.net)CODE39码的编码规则是： 1、每五条线表示一个字符； 2、粗线表示1，细线表示0； 3、线条间的间隙宽的表示1，巧妙利用ASP.net生成漂亮的条形码(2)，窄的表示0； 4、五条线加上它们之间的四条间隙就是九位二进制编码，而且这九位中必定有三位是1

C#实现Code39条形码在线输出(Asp.net)
CODE39码的编码规则是：

1、每五条线表示一个字符；

2、粗线表示1，细线表示0；

3、线条间的间隙宽的表示1，窄的表示0；

4、五条线加上它们之间的四条间隙就是九位二进制编码，而且这九位中必定有三位是1，所以称为39码；

5、条形码的首尾各一个＊标识开始和结束

using System;
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Data;

 

namespace test.test.MyImage.BandCode
{
    /// <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();

        }
    }

}

 

default.aspx.cs文件

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Drawing;
using System.Web.UI.WebControls;

namespace test
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            test.MyImage.BandCode.Code39 _Code39 = new test.MyImage.BandCode.Code39();

            _Code39.Height = 120;
            _Code39.Magnify = 1;
            _Code39.ViewFont = new Font("宋体", 20);

            
            System.Drawing.Image _CodeImage = _Code39.GetCodeImage("123ABC4567890FWF", test.MyImage.BandCode.Code39.Code39Model.Code39Normal, true);

            System.IO.MemoryStream _Stream = new System.IO.MemoryStream();
            _CodeImage.Save(_Stream, System.Drawing.Imaging.ImageFormat.Jpeg);
            _CodeImage.Save(@"C:\1.jpeg");
            _CodeImage.Save(@"C:\1.BMP");
            _CodeImage.Save(@"C:\1.GIF");

            Response.ContentType = "image/jpeg";
            Response.Clear();
            Response.BufferOutput = true;
            Response.BinaryWrite(_Stream.GetBuffer());
            Response.Flush();
        }

    }
}