C#生成Code39条形码而非条形码字体的方法

由于code39编译简单、能够对任意长度的数据进行编码、支持设备比较广泛所以被广泛的采用，下面通过文字说明和代码分析给大家介绍下c#生成code39条形码而非条形码字体的方法。

能够对任意长度的数据进行编码。其局限在于印刷品的长度和条码阅读器的识别范围。
支持设备广泛。目前几乎所有的条形码阅读设备都能阅读code39码，打印机也是同样情况。
编制简单。简单的开发技术就能快速生成相应的编码图像。
一般code39码由5条线和分开它们的4条缝隙共9个元素构成。线和缝隙有宽窄之分，而且无论线还是缝隙仅有3个比其他的元素要宽一定比例。39码因此得名
code39条形码规则

　　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。
code 39只接受如下43个有效输入字符：
　 1、26个大写字母（a - z），
　 2、十个数字（0 - 9），
　 3、连接号(-),句号（.）,空格,美圆符号($),斜扛(/),加号(+)以及百分号(%)。
     4、其余的输入将被忽略。
　 5、code39通常情况下不需要校验码。但是对於精确度要求高的应用，需要在code39条形码後面增加一个校验码。
条形码的生成网上也有很多库文件，做的特别好的都是商业授权。一维码二维码在.net开源项目中的生成读取比较知名的有:zxing.net()、barcodelib等
但有些时候开源软件所实现的并不满足当下的需求，所以还要做一些其他尝试。效果如下图：

 代码分享:

/// <summary>
 /// code39一维码生成类
 /// http://www.cnblogs.com/bluescreen/p/4689351.html
 /// </summary>
 public class csharpcode39
 {
  #region 数据码
  private byte[,] c39_bp = new byte[,] { 
   { 0x30, 0x30, 0x30, 0x30, 0x31, 0x31, 0x30, 0x31, 0x30, 0x30 }, { 0x31, 0x31, 0x30, 0x30, 0x31, 0x30, 0x30, 0x30, 0x30, 0x31 }, { 0x32, 0x30, 0x30, 0x31, 0x31, 0x30, 0x30, 0x30, 0x30, 0x31 }, { 0x33, 0x31, 0x30, 0x31, 0x31, 0x30, 0x30, 0x30, 0x30, 0x30 }, { 0x34, 0x30, 0x30, 0x30, 0x31, 0x31, 0x30, 0x30, 0x30, 0x31 }, { 0x35, 0x31, 0x30, 0x30, 0x31, 0x31, 0x30, 0x30, 0x30, 0x30 }, { 0x36, 0x30, 0x30, 0x31, 0x31, 0x31, 0x30, 0x30, 0x30, 0x30 }, { 0x37, 0x30, 0x30, 0x30, 0x31, 0x30, 0x30, 0x31, 0x30, 0x31 }, { 0x38, 0x31, 0x30, 0x30, 0x31, 0x30, 0x30, 0x31, 0x30, 0x30 }, { 0x39, 0x30, 0x30, 0x31, 0x31, 0x30, 0x30, 0x31, 0x30, 0x30 }, { 0x41, 0x31, 0x30, 0x30, 0x30, 0x30, 0x31, 0x30, 0x30, 0x31 }, { 0x42, 0x30, 0x30, 0x31, 0x30, 0x30, 0x31, 0x30, 0x30, 0x31 }, { 0x43, 0x31, 0x30, 0x31, 0x30, 0x30, 0x31, 0x30, 0x30, 0x30 }, { 0x44, 0x30, 0x30, 0x30, 0x30, 0x31, 0x31, 0x30, 0x30, 0x31 }, { 0x45, 0x31, 0x30, 0x30, 0x30, 0x31, 0x31, 0x30, 0x30, 0x30 }, { 70, 0x30, 0x30, 0x31, 0x30, 0x31, 0x31, 0x30, 0x30, 0x30 }, 
   { 0x47, 0x30, 0x30, 0x30, 0x30, 0x30, 0x31, 0x31, 0x30, 0x31 }, { 0x48, 0x31, 0x30, 0x30, 0x30, 0x30, 0x31, 0x31, 0x30, 0x30 }, { 0x49, 0x30, 0x30, 0x31, 0x30, 0x30, 0x31, 0x31, 0x30, 0x30 }, { 0x4a, 0x30, 0x30, 0x30, 0x30, 0x31, 0x31, 0x31, 0x30, 0x30 }, { 0x4b, 0x31, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x31, 0x31 }, { 0x4c, 0x30, 0x30, 0x31, 0x30, 0x30, 0x30, 0x30, 0x31, 0x31 }, { 0x4d, 0x31, 0x30, 0x31, 0x30, 0x30, 0x30, 0x30, 0x31, 0x30 }, { 0x4e, 0x30, 0x30, 0x30, 0x30, 0x31, 0x30, 0x30, 0x31, 0x31 }, { 0x4f, 0x31, 0x30, 0x30, 0x30, 0x31, 0x30, 0x30, 0x31, 0x30 }, { 80, 0x30, 0x30, 0x31, 0x30, 0x31, 0x30, 0x30, 0x31, 0x30 }, { 0x51, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x31, 0x31, 0x31 }, { 0x52, 0x31, 0x30, 0x30, 0x30, 0x30, 0x30, 0x31, 0x31, 0x30 }, { 0x53, 0x30, 0x30, 0x31, 0x30, 0x30, 0x30, 0x31, 0x31, 0x30 }, { 0x54, 0x30, 0x30, 0x30, 0x30, 0x31, 0x30, 0x31, 0x31, 0x30 }, { 0x55, 0x31, 0x31, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x31 }, { 0x56, 0x30, 0x31, 0x31, 0x30, 0x30, 0x30, 0x30, 0x30, 0x31 }, 
   { 0x57, 0x31, 0x31, 0x31, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30 }, { 0x58, 0x30, 0x31, 0x30, 0x30, 0x31, 0x30, 0x30, 0x30, 0x31 }, { 0x59, 0x31, 0x31, 0x30, 0x30, 0x31, 0x30, 0x30, 0x30, 0x30 }, { 90, 0x30, 0x31, 0x31, 0x30, 0x31, 0x30, 0x30, 0x30, 0x30 }, { 0x2d, 0x30, 0x31, 0x30, 0x30, 0x30, 0x30, 0x31, 0x30, 0x31 }, { 0x2e, 0x31, 0x31, 0x30, 0x30, 0x30, 0x30, 0x31, 0x30, 0x30 }, { 0x20, 0x30, 0x31, 0x31, 0x30, 0x30, 0x30, 0x31, 0x30, 0x30 }, { 0x2a, 0x30, 0x31, 0x30, 0x30, 0x31, 0x30, 0x31, 0x30, 0x30 }, { 0x24, 0x30, 0x31, 0x30, 0x31, 0x30, 0x31, 0x30, 0x30, 0x30 }, { 0x2f, 0x30, 0x31, 0x30, 0x31, 0x30, 0x30, 0x30, 0x31, 0x30 }, { 0x2b, 0x30, 0x31, 0x30, 0x30, 0x30, 0x31, 0x30, 0x31, 0x30 }, { 0x25, 0x30, 0x30, 0x30, 0x31, 0x30, 0x31, 0x30, 0x31, 0x30 }
   };
  //code39合法字符集 [0-9a-z+-*/%. ] 共43个
  private byte[] c39_cw = new byte[] { 
   0x30, 0x31, 50, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x41, 0x42, 0x43, 0x44, 0x45, 70, 
   0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 80, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 
   0x57, 0x58, 0x59, 90, 0x2d, 0x2e, 0x20, 0x24, 0x2f, 0x2b, 0x25
   };
  private byte[,] c39_ex = new byte[,] { 
   { 1, 0x24, 0x41 }, { 2, 0x24, 0x42 }, { 3, 0x24, 0x43 }, { 4, 0x24, 0x44 }, { 5, 0x24, 0x45 }, { 6, 0x24, 70 }, { 7, 0x24, 0x47 }, { 8, 0x24, 0x48 }, { 9, 0x24, 0x49 }, { 10, 0x24, 0x4a }, { 11, 0x24, 0x4b }, { 12, 0x24, 0x4c }, { 13, 0x24, 0x4d }, { 14, 0x24, 0x4e }, { 15, 0x24, 0x4f }, { 0x10, 0x24, 80 }, 
   { 0x11, 0x24, 0x51 }, { 0x12, 0x24, 0x52 }, { 0x13, 0x24, 0x53 }, { 20, 0x24, 0x54 }, { 0x15, 0x24, 0x55 }, { 0x16, 0x24, 0x56 }, { 0x17, 0x24, 0x57 }, { 0x18, 0x24, 0x58 }, { 0x19, 0x24, 0x59 }, { 0x1a, 0x24, 90 }, { 0x1b, 0x25, 0x41 }, { 0x1c, 0x25, 0x42 }, { 0x1d, 0x25, 0x43 }, { 30, 0x25, 0x44 }, { 0x1f, 0x25, 0x45 }, { 0x3b, 0x25, 70 }, 
   { 60, 0x25, 0x47 }, { 0x3d, 0x25, 0x48 }, { 0x3e, 0x25, 0x49 }, { 0x3f, 0x25, 0x4a }, { 0x5b, 0x25, 0x4b }, { 0x5c, 0x25, 0x4c }, { 0x5d, 0x25, 0x4d }, { 0x5e, 0x25, 0x4e }, { 0x5f, 0x25, 0x4f }, { 0x7b, 0x25, 80 }, { 0x7c, 0x25, 0x51 }, { 0x7d, 0x25, 0x52 }, { 0x7e, 0x25, 0x53 }, { 0x7f, 0x25, 0x54 }, { 0, 0x25, 0x55 }, { 0x40, 0x25, 0x56 }, 
   { 0x60, 0x25, 0x57 }, { 0x21, 0x2f, 0x41 }, { 0x22, 0x2f, 0x42 }, { 0x23, 0x2f, 0x43 }, { 0x26, 0x2f, 70 }, { 0x27, 0x2f, 0x47 }, { 40, 0x2f, 0x48 }, { 0x29, 0x2f, 0x49 }, { 0x2a, 0x2f, 0x4a }, { 0x2c, 0x2f, 0x4c }, { 0x3a, 0x2f, 90 }, { 0x61, 0x2b, 0x41 }, { 0x62, 0x2b, 0x42 }, { 0x63, 0x2b, 0x43 }, { 100, 0x2b, 0x44 }, { 0x65, 0x2b, 0x45 }, 
   { 0x66, 0x2b, 70 }, { 0x67, 0x2b, 0x47 }, { 0x68, 0x2b, 0x48 }, { 0x69, 0x2b, 0x49 }, { 0x6a, 0x2b, 0x4a }, { 0x6b, 0x2b, 0x4b }, { 0x6c, 0x2b, 0x4c }, { 0x6d, 0x2b, 0x4d }, { 110, 0x2b, 0x4e }, { 0x6f, 0x2b, 0x4f }, { 0x70, 0x2b, 80 }, { 0x71, 0x2b, 0x51 }, { 0x72, 0x2b, 0x52 }, { 0x73, 0x2b, 0x53 }, { 0x74, 0x2b, 0x54 }, { 0x75, 0x2b, 0x55 }, 
   { 0x76, 0x2b, 0x56 }, { 0x77, 0x2b, 0x57 }, { 120, 0x2b, 0x58 }, { 0x79, 0x2b, 0x59 }, { 0x7a, 0x2b, 90 }
   };
  #endregion
  #region 字段和属性
  private bool _checksum;
  private string _datatoencode;
  private bool _humanreadable;
  private string _humanreadablefont;
  private float _humanreadablesize;
  private float _marginx;
  private float _marginy;
  private float _moduleheight;
  private float _modulewidth;
  private float _ratio;
  private float _reduction;
  private color _codebarcolor = color.black;
  private bool _isdisplaycheckcode;
  private string _checkdata;
  private bool _isdisplaystartstopsign;
  /// <summary>
  /// 是否检查效验
  /// </summary>
  public bool checksum
  {
   get
   {
    return _checksum;
   }
   set
   {
    _checksum = value;
   }
  }

  /// <summary>
  /// 要进行编码的数据
  /// </summary>
  public string datatoencode
  {
   get
   {
    return _datatoencode;
   }
   set
   {
    _datatoencode = value;
   }
  }

  /// <summary>
  /// 是否显示文本内容
  /// </summary>
  public bool humanreadable
  {
   get
   {
    return _humanreadable;
   }
   set
   {
    _humanreadable = value;
   }
  }
  /// <summary>
  /// 用于显示文本内容的字体
  /// </summary>
  public string humanreadablefont
  {
   get
   {
    return _humanreadablefont;
   }
   set
   {
    _humanreadablefont = value;
   }
  }
  /// <summary>
  /// 用于显示文本内容文字的代大小 
  /// </summary>
  public float humanreadablesize
  {
   get
   {
    return _humanreadablesize;
   }
   set
   {
    _humanreadablesize = value;
   }
  }
  /// <summary>
  /// 水平方向边距
  /// 水平方向建议尽量留白
  /// 如果没有留白同时模块宽度较小可能会造成无法识别
  /// </summary>
  public float marginx
  {
   get
   {
    return _marginx;
   }
   set
   {
    _marginx = value;
   }
  }
  /// <summary>
  /// 垂直方向边距
  /// </summary>
  public float marginy
  {
   get
   {
    return _marginy;
   }
   set
   {
    _marginy = value;
   }
  }
  /// <summary>
  /// 模块高度(mm)
  /// </summary>
  public float moduleheight
  {
   get
   {
    return _moduleheight;
   }
   set
   {
    _moduleheight = value;
   }
  }
  /// <summary>
  /// 模块宽度(mm)
  /// 模块宽度不应低于0.2646f
  /// 模块宽度过低会造成数据丢失因而读不出数据或者会误读
  /// </summary>
  public float modulewidth
  {
   get
   {
    return _modulewidth;
   }
   set
   {
    _modulewidth = value;
   }
  }

  /// <summary>
  /// 放大比率 
  /// </summary>
  public float ratio
  {
   get
   {
    return _ratio;
   }
   set
   {
    _ratio = value;
   }
  }
  /// <summary>
  /// 缩小
  /// </summary>
  public float reduction
  {
   get
   {
    return _reduction;
   }
   set
   {
    _reduction = value;
   }
  }
  /// <summary>
  /// 设置条形码的颜色
  /// </summary>
  public color codebarcolor
  {
   get
   {
    return _codebarcolor;
   }
   set
   {
    _codebarcolor = value;
   }
  }
  /// <summary>
  /// 是否显示效验码
  /// 此属性要在checksum属性为true的情况下有用
  /// </summary>
  public bool isdisplaycheckcode
  {
   get { return this._isdisplaycheckcode; }
   set { this._isdisplaycheckcode = value; }
  }
  /// <summary>
  /// 供人识别是否显示起止符
  /// </summary>
  public bool isdisplaystartstopsign
  {
   get { return this._isdisplaystartstopsign; }
   set { this._isdisplaystartstopsign = value; }
  }
  #endregion
  /// <summary>
  /// 默认构造函数
  /// 初始化
  /// </summary>
  public csharpcode39()
  {
   this.initdata();
  }
  public csharpcode39(string datatoencode)
  {
   this.initdata();
   this._datatoencode = datatoencode;
  }
  /// <summary>
  /// 默认构造函数
  /// 初始化数据
  /// </summary>
  private void initdata()
  {
   this._humanreadablefont = "arial";
   this._humanreadablesize = 10f;
   this._codebarcolor = color.black;
   this._moduleheight = 15f;//模块高度毫米
   this._modulewidth = 0.35f;//模块宽度毫米
   this._ratio = 3f;
   this._marginx =2;
   this._marginy =2;
   this._checksum = true;
   this._isdisplaycheckcode = false;
   this._isdisplaystartstopsign = false;
  }
  private char[] _bitpattern_c39(string rawdata, ref int finallength)
  {
   //0x27 39 
   //0x50 80
   if ((rawdata.length == 0) || (rawdata.length > 0x50 /*0x27*/))
   {
    return null;
   }
   for (int i = 0; i < rawdata.length; i++)
   {
    if ((rawdata[i] == '\0') || (rawdata[i] > '\x007f'))
    {
     return null;
    }
   }
   byte[] data = processtilde(rawdata);
   if (data.length == 0)
   {
    return null;
   }
   byte[] buffer2 = this.processextended(data);
   if ((buffer2.length == 0) || (buffer2.length > /*40*/80))
   {
    return null;
   }
   finallength = this._checksum ? ((buffer2.length + 2) + 1) : (buffer2.length + 2);
   return this.getpattern_c39(buffer2);
  }

  /// <summary>
  /// 计算效验值
  /// </summary>
  /// <param name="data"></param>
  /// <param name="len"></param>
  /// <returns></returns>
  private byte _checksum_c39(byte[] data, int len)
  {
   //0x2b 43
   //字符值的总和除以合法字符集的个数43 取余数 余数在合法字符数组中对应的数值就是效验值
   int num2 = 0;
   for (int i = 1; i < len; i++)
   {
    num2 += this.valuefromcharacter(data[i]);
   }
   return this.c39_cw[num2 % 0x2b];
  }
  private char[] code39_bitpattern(string datatoencode)
  {
   int finallength = 0;
   return this._bitpattern_c39(datatoencode, ref finallength);
  }
  /// <summary>
  /// 获得code39条码图片
  /// </summary>
  /// <param name="resolution">dpi</param>
  /// <returns></returns>
  public bitmap getbitmapimage(float resolution)
  {
   return code39_createcode(resolution);
  }
  private bitmap code39_createcode(float resolution)
  {
   int num6;
   int finallength = 0;
   char[] charray = this._bitpattern_c39(datatoencode, ref finallength);
   if (charray == null)
   {
    return null;
   }
   float fontsize = this._humanreadable ? (0.3527778f * this._humanreadablesize) : 0f;
   // float num3 = (7f * modulewidth) + ((3f * ratio) * modulewidth);
   float num3 = (7f * this._modulewidth) + ((3f * this._ratio) * this._modulewidth);
   float width = (finallength * num3) + (2f * this._marginx);
   float height = (this._moduleheight + (2f * this._marginy)) + fontsize;
   width *= resolution / 25.4f;
   height *= resolution / 25.4f;
   bitmap image = new bitmap((int)width, (int)height, pixelformat.format32bpppargb);
   image.setresolution(resolution, resolution);
   //image.setresolution(300, 300);
   graphics g = graphics.fromimage(image);
   g.clear(color.white);
   g.pageunit = graphicsunit.millimeter; //以毫米为度量单位
   g.fillrectangle(new solidbrush(color.white), new rectangle(0, 0, /*(int)width*/image.width, /*(int)height*/image.height));
   //new pen(color.black, 2f);
   //new solidbrush(color.white);
   solidbrush brush = new solidbrush(color.black);
   if (resolution < 300f)
   {
    //g.textrenderinghint = textrenderinghint.antialias;
    //g.smoothingmode = smoothingmode.antialias;
    g.compositingquality = compositingquality.highquality;
    //g.smoothingmode = smoothingmode.highquality;
    g.interpolationmode = interpolationmode.highqualitybicubic;
    g.textrenderinghint = textrenderinghint.antialiasgridfit;
   }
   float num7 = 0f;
   for (num6 = 0; num6 < charray.length; num6++)
   {
    if (charray[num6] == '0')
    {
     if ((num6 & 1) != 1)
     {
      rectanglef rect = new rectanglef(marginx + num7, marginy, modulewidth, moduleheight);
      makebar(g, rect, reduction);
     }
     num7 += 1f * modulewidth;
    }
    else
    {
     if ((num6 & 1) != 1)
     {
      rectanglef ef2 = new rectanglef(marginx + num7, marginy, ratio * modulewidth, moduleheight);
      makebar(g, ef2, reduction);
     }
     num7 += ratio * modulewidth;
    }
   }
   #region 供人识别内容
   if (this._humanreadable)
   {
    #region 保留
    /*byte[] buffer2 = processtilde(this._datatoencode);
    int index = 0;
    list<byte> arr = new list<byte>();
    for (num6 = 0; num6 < buffer2.length; num6++)
    {
     //0x20 32  0x7e 126
     if ((buffer2[num6] >= 0x20) && (buffer2[num6] <= 0x7e))
     {
      arr.add(buffer2[num6]);
     }
    }
    byte[] bytes = new byte[arr.count];
    for (int i = 0; i < arr.count; i++)
    {
     bytes[i] = arr[i];
    }
    index = arr.count;
    //string text = new asciiencoding().getstring(bytes, 0, index);
     */ 
    #endregion
    string text = this._datatoencode;
    if (this._isdisplaycheckcode&&!string.isnullorempty(this._checkdata)) {
     text += this._checkdata;
    }
    if (this._isdisplaystartstopsign)
    {
     text = "*" + text + "*";
    }
    font font = new font(this._humanreadablefont, this._humanreadablesize);
    //g.drawstring(text, font, brush, new pointf(marginx, marginy + moduleheight));
    //新增字符串格式
    var drawformat = new stringformat { alignment = stringalignment.center };
    float inpix = image.width / resolution;//根据dpi求出 英寸数
    float widthmm = inpix * 25.4f; //有每英寸像素求出毫米
    //g.drawstring(text, font, brushes.black, width / 2, height - 14, drawformat);
    g.drawstring(text, font, /*brushes.black*/brush, new pointf(/*marginx*/(int)(widthmm / 2), marginy + moduleheight + 1), drawformat);
   }
   #endregion

   return image;
  }
  /// <summary>
  /// 进行图形填充
  /// </summary>
  /// <param name="g"></param>
  /// <param name="rect"></param>
  /// <param name="reduction"></param>
  private void makebar(graphics g, rectanglef rect, float reduction)
  {
   makebar(g, rect, reduction,this._codebarcolor);
  }
  /// <summary>
  /// 进行图形填充
  /// </summary>
  /// <param name="g"></param>
  /// <param name="rect"></param>
  /// <param name="reduction"></param>
  /// <param name="brushcolor"></param>
  private void makebar(graphics g, rectanglef rect, float reduction, color brushcolor)
  {
   float num = rect.width * (reduction / 200f);
   float num2 = rect.width - (rect.width * (reduction / 200f));
   rectanglef ef = new rectanglef
   {
    x = rect.x + num,
    y = rect.y,
    width = num2,
    height = rect.height
   };
   solidbrush brush = new solidbrush(brushcolor);
   g.fillrectangle(brush, ef);
  }
  private char[] getpattern_c39(byte[] data)
  { //0x2a 42为*
   //int num = 0x27;
   int num = 80;
   byte[] buffer = new byte[num + 1];
   buffer[0] = 0x2a;
   int index = 1;
   for (int i = 0; i < data.length; i++)
   {
    buffer[index] = data[i];
    index++;
   }
   if (checksum)
   {
    buffer[index] = this._checksum_c39(buffer, index);
    if (_isdisplaycheckcode)
    {
     this._checkdata = ((char)buffer[index]).tostring();
    }
    index++;
   }
   buffer[index] = 0x2a;
   index++;
   char[] charray = new char[index * 10];
   int num5 = 0;
   for (int j = 0; j < index; j++)
   {
    byte c = buffer[j];
    int num9 = this.indexfromcharacter(c);
    for (int k = 0; k < 9; k++)
    {
     charray[num5] = (char)this.c39_bp[num9, k + 1];
     num5++;
    }
    charray[num5] = '0';
    num5++;
   }
   return charray;
  }
  private int indexfromcharacter(byte c)
  {
   //0x2c==44
   for (int i = 0; i < 0x2c; i++)
   {
    if (this.c39_bp[i, 0] == c)
    {
     return i;
    }
   }
   return -1;
  }

  private byte[] processextended(byte[] data)
  {
   //0x25 38
   //0x4f 79 0x4e 78
   //int num = 0x4f;
   int num = data.length - 1;
   byte[] sourcearray = new byte[num + 1];
   int index = 0;
   for (int i = 0; i < data.length; i++)
   {
    byte c = data[i];
    if (this.valuefromcharacter(c) != -1)
    {
     sourcearray[index] = c;
     index++;
    }
    else
    {
     byte num5 = 0;
     byte num6 = 0;
     if (this.valuesfromextended(c, ref num5, ref num6))
     {
      sourcearray[index] = num5;
      sourcearray[index + 1] = num6;
      index += 2;
     }
    }
   }
   byte[] destinationarray = new byte[index];
   array.copy(sourcearray, destinationarray, index);
   return destinationarray;
  }
  /// <summary>
  /// 返回指定字符在code39合法字符数组中对应的索引
  /// </summary>
  /// <param name="c"></param>
  /// <returns></returns>
  private int valuefromcharacter(byte c)
  {
   //c39_cw为数组，保存的为合法的字符集信息[0-9a-z+-*/%. ] 共43个
   //如果存在这个字符就返回c39_cw对应的索引
   for (int i = 0; i < /*0x2b*/this.c39_cw.length; i++)
   {
    if (this.c39_cw[i] == c)
    {
     return i;
    }
   }
   return -1;
  }
  /// <summary>
  /// 判断字符集是否存在extended
  /// </summary>
  /// <param name="c"></param>
  /// <param name="v1"></param>
  /// <param name="v2"></param>
  /// <returns></returns>
  private bool valuesfromextended(byte c, ref byte v1, ref byte v2)
  {
   //0x55 85
   for (int i = 0; i < 0x55; i++)
   {
    if (this.c39_ex[i, 0] == c)
    {
     v1 = this.c39_ex[i, 1];
     v2 = this.c39_ex[i, 2];
     return true;
    }
   }
   return false;
  }
  private byte[] processtilde(string rawdata)
  {
   byte[] sourcearray = new byte[rawdata.length];
   int index = 0;
   for (int i = 0; i < rawdata.length; i++)
   {
    if (rawdata[i] != '~')
    {
     sourcearray[index] = (byte)rawdata[i];
     index++;
    }
    else if ((i + 3) < rawdata.length)
    {
     string str = new string(new char[] { rawdata[i + 1], rawdata[i + 2], rawdata[i + 3] });
     int num3 = convert.toint32(str, 10);
     if ((num3 > 0) && (num3 <= 0xff))
     {
      sourcearray[index] = (byte)num3;
      index++;
     }
     if (num3 == 0x3e7)
     {
      sourcearray[index] = 0x86;
      index++;
     }
     i += 3;
    }
    else
    {
     sourcearray[index] = (byte)rawdata[i];
     index++;
    }
   }
   byte[] destinationarray = new byte[index];
   array.copy(sourcearray, destinationarray, index);
   return destinationarray;
  }
 }

 这个方法是根据dpi以及数据模块的高宽来确定条码的实际高宽。模块的宽度以毫米（mm）来算。类中的getbitmapimage方法的一个参数getbitmapimage为dpi。安卓用户安装平时常用的扫码软件即可做识别测试。就识别率来说还是可以的，扫描枪绝对是可以扫的出的。同时使用过messagingtoolkit.barcode进行解码测试，万张无一误读。

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