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,下面介绍下C#生成Code39条形码而非条形码字体的方法,需要的朋友可以参考下
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(http://zxingnet.codeplex.com/)、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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