Create a digital verification code and a digital verification code

Create a digital verification code and a digital verification code

1 public class ValidateCode 2 {3 public ValidateCode () 4 {5} 6 /// <summary> 7 // Maximum length of the verification code 8 /// </summary> 9 public int MaxLength 10 {11 get {return 10 ;} 12} 13 // <summary> 14 // the minimum length of the verification code is 15 /// </summary> 16 public int MinLength 17 {18 get {return 1 ;} 19} 20 // <summary> 21 // generate Verification Code 22 /// </summary> 23 // <param name = "length"> specify the length of the Verification Code </param> 24 // <returns> Verification code string </returns> 25 public string CreateValidateCode (int length) 26 {27 int [] randMembers = new int [length]; 28 int [] validateNums = new int [length]; 29 string validateNumberStr = ""; 30 // generate the Starting sequence value 31 int seekSeek = unchecked (int) DateTime. now. ticks); 32 Random seekRand = new Random (seekSeek); 33 int beginSeek = (int) seekRand. next (0, Int32.MaxValue-length * 10000); 34 int [] seeks = new int [length]; 35 for (int I = 0; I <length; I ++) 36 {37 beginSeek + = 10000; 38 seeks [I] = beginSeek; 39} 40 // generate random number 41 for (int I = 0; I <length; I ++) 42 {43 Random rand = new Random (seeks [I]); 44 int pownum = 1 * (int) Math. pow (10, length); 45 randMembers [I] = rand. next (pownum, Int32.MaxValue); 46} 47 // extract random numbers 48 for (int I = 0; I <length; I ++) 49 {50 string numStr = randMembers [I]. toString (); 51 int numLength = numStr. length; 52 Random rand = new Random (); 53 int numPosition = rand. next (0, numLength-1); 54 validateNums [I] = Int32.Parse (numStr. substring (numPosition, 1); 55} 56 // generate the verification code 57 for (int I = 0; I <length; I ++) 58 {59 validateNumberStr + = validateNums [I]. toString (); 60} 61 return validateNumberStr; 62} 63 // ==================================== in webform ===========================64 /// <summary> 65 /// image of the Verification Code created 66 /// </ summary> 67 // <param name = "containsPage"> page object to be output </param> 68 // <param name = "validateNum"> Verification Code </param> 69 public void CreateValidateGraphic (string validateCode, httpContext context) 70 {71 Bitmap image = new Bitmap (int) Math. ceiling (validateCode. length * 12.0), 22); 72 Graphics g = Graphics. fromImage (image); 73 try 74 {75 // generate Random generator 76 random Random = new Random (); 77 // clear image background color 78g. clear (Color. white); 79 // The interference line of the picture is 80 for (int I = 0; I <25; I ++) 81 {82 int x1 = random. next (image. width); 83 int x2 = random. next (image. width); 84 int y1 = random. next (image. height); 85 int y2 = random. next (image. height); 86g. drawLine (new Pen (Color. silver), x1, y1, x2, y2); 87} 88 Font font = new Font ("Arial", 12, (FontStyle. bold | FontStyle. italic); 89 LinearGradientBrush brush = new LinearGradientBrush (new Rectangle (0, 0, image. width, image. height), 90 Color. blue, Color. darkRed, 1.2f, true); 91g. drawString (validateCode, font, brush, 3, 2); 92 // foreground disturbance of the picture to be painted 93 for (int I = 0; I <100; I ++) 94 {95 int x = random. next (image. width); 96 int y = random. next (image. height); 97 image. setPixel (x, y, Color. fromArgb (random. next (); 98} 99 // draw the border line of the image 100g. drawRectangle (new Pen (Color. silver), 0, 0, image. width-1, image. height-1); 101 // Save image data 102 MemoryStream stream = new MemoryStream (); 103 image. save (stream, ImageFormat. jpeg); 104 // The output image stream is 105 context. response. clear (); 106 context. response. contentType = "image/jpeg"; 107 context. response. binaryWrite (stream. toArray (); 108} 109 finally110 {111g. dispose (); 112 image. dispose (); 113} 114} 115 // <summary> 116 // The length of the image for obtaining the verification code is 117 /// </summary> 118 /// <param name = "validateNumLength"> verification code length </param> 119 // <returns> </returns> 120 public static int GetImageWidth (int validateNumLength) 121 {122 return (int) (validateNumLength * 12.0 ); 123} 124 // <summary> 125 // The height of the verification code is 126 /// </summary> 127 // <returns> </returns> 128 public static double getImageHeight () 129 {130 return 22.5; 131} 132 133 // ========================== in mvc ============ 134 // C # MVC upgraded version 135 /// <summary> 136 // picture of the Verification Code created 137 /// </summary> 138 /// <param name = "containsPage"> page object to be output </param> 139 /// <param name = "validateNum"> Verification Code </param> 140 public byte [] CreateValidateGraphic (string validateCode) 141 {142 Bitmap image = new Bitmap (int) Math. ceiling (validateCode. length * 12.0), 22); 143 Graphics g = Graphics. fromImage (image); 144 try145 {146 // generate a Random generator 147 random Random = new Random (); 148 // clear the image background color 149g. clear (Color. white); 150 // The interference line of the picture. 151 for (int I = 0; I <25; I ++) 152 {153 int x1 = random. next (image. width); 154 int x2 = random. next (image. width); 155 int y1 = random. next (image. height); 156 int y2 = random. next (image. height); 157g. drawLine (new Pen (Color. silver), x1, y1, x2, y2); 158} 159 Font font = new Font ("Arial", 12, (FontStyle. bold | FontStyle. italic); 160 LinearGradientBrush brush = new LinearGradientBrush (new Rectangle (0, 0, image. width, image. height), 161 Color. blue, Color. darkRed, 1.2f, true); 162g. drawString (validateCode, font, brush, 3, 2); 163 // foreground disturbance of the image painting: 164 for (int I = 0; I <100; I ++) 165 {166 int x = random. next (image. width); 167 int y = random. next (image. height); 168 image. setPixel (x, y, Color. fromArgb (random. next (); 169} 170 // draw the border line of the image 171g. drawRectangle (new Pen (Color. silver), 0, 0, image. width-1, image. height-1); 172 // Save image data 173 MemoryStream stream = new MemoryStream (); 174 image. save (stream, ImageFormat. jpeg); 175 // output image stream 176 return stream. toArray (); 177} 178 finally179 {180g. dispose (); 181 image. dispose (); 182} 183} 184}

The verification code and Verification Code image are generated above.

The following is how to use it:

1 string code = vCode. CreateValidateCode (4); // obtain the generated Verification code 2 byte [] bcode = vCode. CreateValidateGraphic (code); // create the verification code as the binary format of the image