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注册时的图片验证码

注册时的图⽚验证码

⽣成图⽚验证码

1using System;

2using System.Data;

3using System.Configuration;

4using System.Web;

5using System.Web.Security;

6using System.Web.UI;

7using System.Web.UI.HtmlControls;

8using System.Web.UI.WebControls;

9using System.Web.UI.WebControls.WebParts;

10using System.Xml.Linq;

11using System.Drawing;

12using System.Text;

14///<summary>

15/// VdCode 的摘要说明

16///</summary>

17public class VdCode

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18 {

19///<summary>

20///全局随机数⽣成器

21///</summary>

22private Random rndNumber;

23public static string mrChineseChars = String.Empty;

24///<summary>

25///英⽂与数字串

26///</summary>

27// protected static readonly string mrEnglishOrNumChars = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"; 28protected static readonly string mrEnglishOrNumChars = "0123456789";

30public VdCode()

31 {

32 rndNumber = new Random(unchecked((int)DateTime.Now.Ticks));

33 }

34// 验证码长度(默认6个验证码的长度)

35int length = 5;

36public int Length

37 {

38get { return length; }

39set { length = value; }

40 }

41//验证码字体⼤⼩

42// int fontSize = 18;

43int fontSize = 18;

44public int FontSize

45 {

46get { return fontSize; }

47set { fontSize = value; }

48 }

49// 边框补(默认4像素)

50//int padding = 4;

51int padding = 4;

52public int Padding

53 {

54get { return padding; }

55set { padding = value; }

56 }

57// 是否输出燥点(默认输出)

58bool chaos = true;

59public bool Chaos

60 {

61get { return chaos; }

62set { chaos = value; }

63 }

64// 输出燥点的颜⾊(默认灰⾊)

65 Color chaosColor = Color.LightGray;

66public Color ChaosColor

67 {

68get { return chaosColor; }

69set { chaosColor = value; }

70 }

71// ⾃定义背景⾊(默认⽩⾊)

72 Color backgroundColor = Color.White;

73public Color BackgroundColor

74 {

75get { return backgroundColor; }

76set { backgroundColor = value; }

77 }

78// ⾃定义随机颜⾊数组

79 Color[] colors = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple }; 80public Color[] Colors

81 {

82get { return colors; }

83set { colors = value; }

84 }

85// ⾃定义字体数组

86string[] fonts = { "Arial", "Georgia" };

87public string[] Fonts

88 {

89get { return fonts; }

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90set { fonts = value; }

91 }

92#region产⽣扭曲图⽚

93private const double PI = 3.1415926535897932384626433832795;

94private const double PI2 = 6.283185307179586476925286766559;

95//private const double PI =0;

96//private const double PI2 =0;

97///<summary>

98///该⽅法⽤于扭曲图⽚

99///</summary>

100///<param name="srcBmp">图⽚路径</param>

101///<param name="bXDir">如果扭曲则选择为True</param>

102///<param name="nMultValue">波形的幅度倍数，越⼤扭曲的程度越⾼，⼀般为3</param>

103///<param name="dPhase">波形的起始相位，取值区间[0-2*PI)</param>

104///<returns></returns>

105public System.Drawing.Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase)

106 {

107 System.Drawing.Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height);//创建Bitmap对象

108// 将位图背景填充为⽩⾊固化闪电之源

109 System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(destBmp);//创建Graphics对象

110 g.FillRectangle(new SolidBrush(System.Drawing.Color.White), 0, 0, destBmp.Width, destBmp.Height);//将位图背景填充为⽩⾊111 g.Dispose();//释放raphics对象

112double dBaseAxisLen = bXDir ? (double)destBmp.Height : (double)destBmp.Width;//判断扭曲⽅式

113for (int i = 0; i < destBmp.Width; i++)

114 {

115for (int j = 0; j < destBmp.Height; j++)

116 {

117double dx = 0;

118 dx = bXDir ? (PI2 * (double)j) / dBaseAxisLen : (PI2 * (double)i) / dBaseAxisLen;

119 dx += dPhase;

120double dy = Math.Sin(dx);

121// 取得当前点的颜⾊

122int nOldX = 0, nOldY = 0;

123 nOldX = bXDir ? i + (int)(dy * dMultValue) : i;

124 nOldY = bXDir ? j : j + (int)(dy * dMultValue);

125 System.Drawing.Color color = srcBmp.GetPixel(i, j);

126if (nOldX >= 0 && nOldX < destBmp.Width

127 && nOldY >= 0 && nOldY < destBmp.Height)

128 {

129 destBmp.SetPixel(nOldX, nOldY, color);

130 }

131 }

132 }

133return destBmp;

134 }

135#endregion

136///<summary>

137///⽣成校验码图⽚

138///</summary>

139///<param name="code">验证码</param>

140///<returns></returns>

141public Bitmap CreateImage(string code)

142 {

143int fSize = FontSize;

144int fWidth = fSize + Padding;

145int imageWidth = (int)(code.Length * fWidth) + 4 + Padding * 2;

146int imageHeight = fSize * 2 + Padding * 2;

147 System.Drawing.Bitmap image = new System.Drawing.Bitmap(imageWidth, imageHeight);

148 Graphics g = Graphics.FromImage(image);

149 g.Clear(BackgroundColor);

150//给背景添加随机⽣成的燥点

151if (this.Chaos)

152 {

153 Pen pen = new Pen(ChaosColor, 0);

154int c = Length * 10;

155for (int i = 0; i < c; i++)

156 {

157int x = rndNumber.Next(image.Width);

158int y = rndNumber.Next(image.Height);

159

160 g.DrawRectangle(pen, x, y, 1, 1);

161 }

162 }

163int left = 0, top = 0, top1 = 1, top2 = 1;

164int n1 = (imageHeight - FontSize - Padding * 2);

165int n2 = n1 / 4;

166 top1 = n2;

167 top2 = n2 * 2;

168 Font f;

169 Brush b;

170int cindex, findex;

171//随机字体和颜⾊的验证码字符

172for (int i = 0; i < code.Length; i++)

173 {

174 cindex = rndNumber.Next(Colors.Length - 1);

175 findex = rndNumber.Next(Fonts.Length - 1);

176 f = new System.Drawing.Font(Fonts[findex], fSize, System.Drawing.FontStyle.Bold); 177 b = new System.Drawing.SolidBrush(Colors[cindex]);

178if (i % 2 == 1)

179 {

180 top = top2;

181 }

182else

183 {

184 top = top1;

185 }

186 left = i * fWidth;

187 g.DrawString(code.Substring(i, 1), f, b, left, top);

188 }

189//画⼀个边框边框颜⾊为Color.Gainsboro

190 g.DrawRectangle(new Pen(Color.Gainsboro, 0), 0, 0, image.Width - 1, image.Height - 1); 191 g.Dispose();

192//产⽣波形（Add By 51aspx）

193//image = TwistImage(image, true, 8, 4);

194 image = TwistImage(image, false, 0, 0);

195return image;

196 }

197///<summary>

198///⽣成随机字符码

199///</summary>

200///<param name="codeLen">字符串长度</param>

201///<param name="zhCharsCount">中⽂字符数</param>

202///<returns></returns>

203public string CreateVerifyCode(int codeLen, int zhCharsCount)

204 {

205char[] chs = new char[codeLen];

206

207int index;

208for (int i = 0; i < zhCharsCount; i++)

209 {

210 index = rndNumber.Next(0, codeLen);

211if (chs[index] == '\0')

212 chs[index] = CreateZhChar();

213else

214 --i;

215 }

216for (int i = 0; i < codeLen; i++)

217 {

218if (chs[i] == '\0')

219 chs[i] = CreateEnOrNumChar();

220 }

221

222return new string(chs, 0, chs.Length);

223 }

224// ⽣成默认长度5的随机字符码

225public string CreateVerifyCode()

226 {

227return CreateVerifyCode(Length, 0);

228 }

229// ⽣成英⽂或数字字符

230protected char CreateEnOrNumChar()

231 {

232return mrEnglishOrNumChars[rndNumber.Next(0, mrEnglishOrNumChars.Length)];

233 }

234protected char CreateZhChar() // ⽣成汉字字符

235 {

236//若提供了汉字集，查询汉字集选取汉字

237if (mrChineseChars.Length > 0)

238 {

239return mrChineseChars[rndNumber.Next(0, mrChineseChars.Length)];

240 }

241//若没有提供汉字集，则根据《GB2312简体中⽂编码表》编码规则构造汉字

242else

243 {

244byte[] bytes = new byte[2];

246//第⼀个字节值在0xb0, 0xf7之间

247 bytes[0] = (byte)rndNumber.Next(0xb0, 0xf8);

248//第⼆个字节值在0xa1, 0xfe之间

249 bytes[1] = (byte)rndNumber.Next(0xa1, 0xff);

250

251//根据汉字编码的字节数组解码出中⽂汉字

252string str1 = Encoding.GetEncoding("gb2312").GetString(bytes);

253

254return str1[0];

255 }

256 }

257 }

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