企业为什么建站,网址二维码生成器,天津seo管理平台,做摄影网站的目的是什么我们是做HIS系统开发的#xff0c;前段时间发现某些处方的一维码出现无法识别的情况。看了一下一维码生成的逻辑#xff0c;使用到了BarcodeLib库#xff0c;经过反复确认#xff0c;我们程序是没有问题的。后面不得不反编译看一下BarcodeLib生成一维码的逻辑。最后调整一维…我们是做HIS系统开发的前段时间发现某些处方的一维码出现无法识别的情况。看了一下一维码生成的逻辑使用到了BarcodeLib库经过反复确认我们程序是没有问题的。后面不得不反编译看一下BarcodeLib生成一维码的逻辑。最后调整一维码的宽度解决了问题。而且发现它的编码和通信领域的编码思想有神奇的相似之处。编码格式类型开始位数据位检查校验位STOP停止位11。总的来说是解密和编码都是查表法如要把数字69进行编码通过查表可以知道编码的结果为10110010000。 解密就是逆过程如知道编码为10110010000通过查表也可以知道编码前的数字为69 这里简单介绍一下BarcodeLib库Code128一维码的编码过程
1 先把数字如6986081进行编码两个数字作为一组进行编码这里数字69一组86一组08一组剩下一个1就比较特别源码看得不是很懂有特殊的规则进行编码
2 把两位数字通过查表法进行编码编码为11位的0或1数字。如数字69编码为10110010000
3 通过C#的绘图类Graphics的画线方法.DrawLine进行绘制线如要绘制10110010000编码碰到1就纵向绘制一定宽度的直线碰到0就不绘制直线。 下面我们一起来分析一下这个一维码 先告知一下这个一维码的值为6986081 通过上图的分析上图的编码可以编码为
1101001110010110010000111101001001000110010011101011110 10011100110100010001101100011101011
按照11位进行分组整理后如下
11010011100 10110010000 11110100100 10001100100 11101011110 10011100110 10001000110 11000111010 11 通过编码11010011100查找本文后面的编码表得到的数值为START_C 通过编码10110010000查找本文后面的编码表得到的数值为69 通过编码10001100100查找本文后面的编码表得到的数值为08 通过编码11101011110查找本文后面的编码表得到的数值为CODE_A 通过编码10011100110 查找本文后面的编码表得到的数值为17但前面有一个CODE_A应该编码为1 通过编码10001000110查找本文后面的编码表得到的数值为C则为检查校验位 通过编码11000111010查找本文后面的编码表得到的数值为STOP则为停止位 最后两位11应该也是校验位吧。 最后汇总如下
11010011100 START_C 开始 10110010000 69 11110100100 86 10001100100 08 11101011110 CODE_A 10011100110 这个是编1而不是17 10001000110 检查校验位 11000111010 STOP停止位 11 最后一维码的解码结果为6986081 补充说明
BarcodeLib库Code128编码表如下偷懒一点就直接贴源码了 private void init_Code128()
{this.C128_Code.CaseSensitive true;this.C128_Code.Columns.Add(Value, typeof(string));this.C128_Code.Columns.Add(A, typeof(string));this.C128_Code.Columns.Add(B, typeof(string));this.C128_Code.Columns.Add(C, typeof(string));this.C128_Code.Columns.Add(Encoding, typeof(string));this.C128_Code.Rows.Add(new object[]{0, , ,00,11011001100});this.C128_Code.Rows.Add(new object[]{1,!,!,01,11001101100});this.C128_Code.Rows.Add(new object[]{2,\,\,02,11001100110});this.C128_Code.Rows.Add(new object[]{3,#,#,03,10010011000});this.C128_Code.Rows.Add(new object[]{4,$,$,04,10010001100});this.C128_Code.Rows.Add(new object[]{5,%,%,05,10001001100});this.C128_Code.Rows.Add(new object[]{6,,,06,10011001000});this.C128_Code.Rows.Add(new object[]{7,,,07,10011000100});this.C128_Code.Rows.Add(new object[]{8,(,(,08,10001100100});this.C128_Code.Rows.Add(new object[]{9,),),09,11001001000});this.C128_Code.Rows.Add(new object[]{10,*,*,10,11001000100});this.C128_Code.Rows.Add(new object[]{11,,,11,11000100100});this.C128_Code.Rows.Add(new object[]{12,,,,,12,10110011100});this.C128_Code.Rows.Add(new object[]{13,-,-,13,10011011100});this.C128_Code.Rows.Add(new object[]{14,.,.,14,10011001110});this.C128_Code.Rows.Add(new object[]{15,/,/,15,10111001100});this.C128_Code.Rows.Add(new object[]{16,0,0,16,10011101100});this.C128_Code.Rows.Add(new object[]{17,1,1,17,10011100110});this.C128_Code.Rows.Add(new object[]{18,2,2,18,11001110010});this.C128_Code.Rows.Add(new object[]{19,3,3,19,11001011100});this.C128_Code.Rows.Add(new object[]{20,4,4,20,11001001110});this.C128_Code.Rows.Add(new object[]{21,5,5,21,11011100100});this.C128_Code.Rows.Add(new object[]{22,6,6,22,11001110100});this.C128_Code.Rows.Add(new object[]{23,7,7,23,11101101110});this.C128_Code.Rows.Add(new object[]{24,8,8,24,11101001100});this.C128_Code.Rows.Add(new object[]{25,9,9,25,11100101100});this.C128_Code.Rows.Add(new object[]{26,:,:,26,11100100110});this.C128_Code.Rows.Add(new object[]{27,;,;,27,11101100100});this.C128_Code.Rows.Add(new object[]{28,,,28,11100110100});this.C128_Code.Rows.Add(new object[]{29,,,29,11100110010});this.C128_Code.Rows.Add(new object[]{30,,,30,11011011000});this.C128_Code.Rows.Add(new object[]{31,?,?,31,11011000110});this.C128_Code.Rows.Add(new object[]{32,,,32,11000110110});this.C128_Code.Rows.Add(new object[]{33,A,A,33,10100011000});this.C128_Code.Rows.Add(new object[]{34,B,B,34,10001011000});this.C128_Code.Rows.Add(new object[]{35,C,C,35,10001000110});this.C128_Code.Rows.Add(new object[]{36,D,D,36,10110001000});this.C128_Code.Rows.Add(new object[]{37,E,E,37,10001101000});this.C128_Code.Rows.Add(new object[]{38,F,F,38,10001100010});this.C128_Code.Rows.Add(new object[]{39,G,G,39,11010001000});this.C128_Code.Rows.Add(new object[]{40,H,H,40,11000101000});this.C128_Code.Rows.Add(new object[]{41,I,I,41,11000100010});this.C128_Code.Rows.Add(new object[]{42,J,J,42,10110111000});this.C128_Code.Rows.Add(new object[]{43,K,K,43,10110001110});this.C128_Code.Rows.Add(new object[]{44,L,L,44,10001101110});this.C128_Code.Rows.Add(new object[]{45,M,M,45,10111011000});this.C128_Code.Rows.Add(new object[]{46,N,N,46,10111000110});this.C128_Code.Rows.Add(new object[]{47,O,O,47,10001110110});this.C128_Code.Rows.Add(new object[]{48,P,P,48,11101110110});this.C128_Code.Rows.Add(new object[]{49,Q,Q,49,11010001110});this.C128_Code.Rows.Add(new object[]{50,R,R,50,11000101110});this.C128_Code.Rows.Add(new object[]{51,S,S,51,11011101000});this.C128_Code.Rows.Add(new object[]{52,T,T,52,11011100010});this.C128_Code.Rows.Add(new object[]{53,U,U,53,11011101110});this.C128_Code.Rows.Add(new object[]{54,V,V,54,11101011000});this.C128_Code.Rows.Add(new object[]{55,W,W,55,11101000110});this.C128_Code.Rows.Add(new object[]{56,X,X,56,11100010110});this.C128_Code.Rows.Add(new object[]{57,Y,Y,57,11101101000});this.C128_Code.Rows.Add(new object[]{58,Z,Z,58,11101100010});this.C128_Code.Rows.Add(new object[]{59,[,[,59,11100011010});this.C128_Code.Rows.Add(new object[]{60,\\,\\,60,11101111010});this.C128_Code.Rows.Add(new object[]{61,],],61,11001000010});this.C128_Code.Rows.Add(new object[]{62,^,^,62,11110001010});this.C128_Code.Rows.Add(new object[]{63,_,_,63,10100110000});this.C128_Code.Rows.Add(new object[]{64,\0,,64,10100001100});this.C128_Code.Rows.Add(new object[]{65,Convert.ToChar(1).ToString(),a,65,10010110000});this.C128_Code.Rows.Add(new object[]{66,Convert.ToChar(2).ToString(),b,66,10010000110});this.C128_Code.Rows.Add(new object[]{67,Convert.ToChar(3).ToString(),c,67,10000101100});this.C128_Code.Rows.Add(new object[]{68,Convert.ToChar(4).ToString(),d,68,10000100110});this.C128_Code.Rows.Add(new object[]{69,Convert.ToChar(5).ToString(),e,69,10110010000});this.C128_Code.Rows.Add(new object[]{70,Convert.ToChar(6).ToString(),f,70,10110000100});this.C128_Code.Rows.Add(new object[]{71,Convert.ToChar(7).ToString(),g,71,10011010000});this.C128_Code.Rows.Add(new object[]{72,Convert.ToChar(8).ToString(),h,72,10011000010});this.C128_Code.Rows.Add(new object[]{73,Convert.ToChar(9).ToString(),i,73,10000110100});this.C128_Code.Rows.Add(new object[]{74,Convert.ToChar(10).ToString(),j,74,10000110010});this.C128_Code.Rows.Add(new object[]{75,Convert.ToChar(11).ToString(),k,75,11000010010});this.C128_Code.Rows.Add(new object[]{76,Convert.ToChar(12).ToString(),l,76,11001010000});this.C128_Code.Rows.Add(new object[]{77,Convert.ToChar(13).ToString(),m,77,11110111010});this.C128_Code.Rows.Add(new object[]{78,Convert.ToChar(14).ToString(),n,78,11000010100});this.C128_Code.Rows.Add(new object[]{79,Convert.ToChar(15).ToString(),o,79,10001111010});this.C128_Code.Rows.Add(new object[]{80,Convert.ToChar(16).ToString(),p,80,10100111100});this.C128_Code.Rows.Add(new object[]{81,Convert.ToChar(17).ToString(),q,81,10010111100});this.C128_Code.Rows.Add(new object[]{82,Convert.ToChar(18).ToString(),r,82,10010011110});this.C128_Code.Rows.Add(new object[]{83,Convert.ToChar(19).ToString(),s,83,10111100100});this.C128_Code.Rows.Add(new object[]{84,Convert.ToChar(20).ToString(),t,84,10011110100});this.C128_Code.Rows.Add(new object[]{85,Convert.ToChar(21).ToString(),u,85,10011110010});this.C128_Code.Rows.Add(new object[]{86,Convert.ToChar(22).ToString(),v,86,11110100100});this.C128_Code.Rows.Add(new object[]{87,Convert.ToChar(23).ToString(),w,87,11110010100});this.C128_Code.Rows.Add(new object[]{88,Convert.ToChar(24).ToString(),x,88,11110010010});this.C128_Code.Rows.Add(new object[]{89,Convert.ToChar(25).ToString(),y,89,11011011110});this.C128_Code.Rows.Add(new object[]{90,Convert.ToChar(26).ToString(),z,90,11011110110});this.C128_Code.Rows.Add(new object[]{91,Convert.ToChar(27).ToString(),{,91,11110110110});this.C128_Code.Rows.Add(new object[]{92,Convert.ToChar(28).ToString(),|,92,10101111000});this.C128_Code.Rows.Add(new object[]{93,Convert.ToChar(29).ToString(),},93,10100011110});this.C128_Code.Rows.Add(new object[]{94,Convert.ToChar(30).ToString(),~,94,10001011110});this.C128_Code.Rows.Add(new object[]{95,Convert.ToChar(31).ToString(),Convert.ToChar(127).ToString(),95,10111101000});this.C128_Code.Rows.Add(new object[]{96,Convert.ToChar(202).ToString(),Convert.ToChar(202).ToString(),96,10111100010});this.C128_Code.Rows.Add(new object[]{97,Convert.ToChar(201).ToString(),Convert.ToChar(201).ToString(),97,11110101000});this.C128_Code.Rows.Add(new object[]{98,SHIFT,SHIFT,98,11110100010});this.C128_Code.Rows.Add(new object[]{99,CODE_C,CODE_C,99,10111011110});this.C128_Code.Rows.Add(new object[]{100,CODE_B,Convert.ToChar(203).ToString(),CODE_B,10111101110});this.C128_Code.Rows.Add(new object[]{101,Convert.ToChar(203).ToString(),CODE_A,CODE_A,11101011110});this.C128_Code.Rows.Add(new object[]{102,Convert.ToChar(200).ToString(),Convert.ToChar(200).ToString(),Convert.ToChar(200).ToString(),11110101110});this.C128_Code.Rows.Add(new object[]{103,START_A,START_A,START_A,11010000100});this.C128_Code.Rows.Add(new object[]{104,START_B,START_B,START_B,11010010000});this.C128_Code.Rows.Add(new object[]{105,START_C,START_C,START_C,11010011100});this.C128_Code.Rows.Add(new object[]{,STOP,STOP,STOP,11000111010});
} 通过阅读BarCode类生成图片的源码如下
private Bitmap Generate_Image(){if (this.Encoded_Value ){throw new Exception(EGENERATE_IMAGE-1: Must be encoded first.);}Bitmap bitmap null;DateTime now DateTime.Now;TYPE encoded_Type this.Encoded_Type;if (encoded_Type ! TYPE.ITF14){bitmap new Bitmap(this.Width, this.Height);int num this.Width / this.Encoded_Value.Length;int num2 1;if (this.Encoded_Type TYPE.PostNet){num2 2;}int num3;switch (this.Alignment){case AlignmentPositions.CENTER:num3 this.Width % this.Encoded_Value.Length / 2;break;case AlignmentPositions.LEFT:num3 0;break;case AlignmentPositions.RIGHT:num3 this.Width % this.Encoded_Value.Length;break;default:num3 this.Width % this.Encoded_Value.Length / 2;break;}if (num 0){throw new Exception(EGENERATE_IMAGE-2: Image size specified not large enough to draw image. (Bar size determined to be less than 1 pixel));}int i 0;using (Graphics graphics Graphics.FromImage(bitmap)){graphics.Clear(this.BackColor);using (Pen pen new Pen(this.BackColor, (float)(num / num2))){using (Pen pen2 new Pen(this.ForeColor, (float)(num / num2))){while (i this.Encoded_Value.Length){if (this.Encoded_Type TYPE.PostNet){if (this.Encoded_Value[i] ! 1){graphics.DrawLine(pen2, new Point(i * num num3 1, this.Height), new Point(i * num num3 1, this.Height / 2));}graphics.DrawLine(pen, new Point(i * (num * num2) num3 num 1, 0), new Point(i * (num * num2) num3 num 1, this.Height));}if (this.Encoded_Value[i] 1){graphics.DrawLine(pen2, new Point(i * num num3 1, 0), new Point(i * num num3 1, this.Height));}i;}}}}if (this.IncludeLabel){this.Label_Generic(bitmap);}}else{bitmap new Bitmap(this.Width, this.Height);int num4 (int)((double)bitmap.Width / 12.05);int num5 Convert.ToInt32((double)bitmap.Width * 0.05);int num (bitmap.Width - num4 * 2 - num5 * 2) / this.Encoded_Value.Length;int num3 (bitmap.Width - num4 * 2 - num5 * 2) % this.Encoded_Value.Length / 2;if (num 0 || num5 0){throw new Exception(EGENERATE_IMAGE-3: Image size specified not large enough to draw image. (Bar size determined to be less than 1 pixel or quiet zone determined to be less than 1 pixel));}int i 0;using (Graphics graphics Graphics.FromImage(bitmap)){graphics.Clear(this.BackColor);using (Pen pen2 new Pen(this.ForeColor, (float)num)){pen2.Alignment PenAlignment.Right;while (i this.Encoded_Value.Length){if (this.Encoded_Value[i] 1){graphics.DrawLine(pen2, new Point(i * num num3 num4 num5, 0), new Point(i * num num3 num4 num5, this.Height));}i;}pen2.Width (float)bitmap.Height / 8f;pen2.Color this.ForeColor;pen2.Alignment PenAlignment.Inset;graphics.DrawLine(pen2, new Point(0, 0), new Point(bitmap.Width, 0));graphics.DrawLine(pen2, new Point(0, bitmap.Height), new Point(bitmap.Width, bitmap.Height));graphics.DrawLine(pen2, new Point(0, 0), new Point(0, bitmap.Height));graphics.DrawLine(pen2, new Point(bitmap.Width, 0), new Point(bitmap.Width, bitmap.Height));}}if (this.IncludeLabel){this.Label_ITF14(bitmap);}}this._Encoded_Image bitmap;this._EncodingTime (DateTime.Now - now).TotalMilliseconds;return bitmap;}
影响一维码生成结果有
1 AlignmentPositions对齐方式靠左、居中、靠右和默认 2 一维码的宽度如果宽度不够那就绘制的线条不全就会出现无法识别的问题
