1 using System;
2 using System.Web;
3 using System.Drawing;
4 using System.Security.Cryptography;
5
6 namespace DotNet.Utilities
7 {
8 /// <summary>
9 /// 验证码类
10 /// </summary>
11 public class Rand
12 {
13 #region 生成随机数字
14 /// <summary>
15 /// 生成随机数字
16 /// </summary>
17 /// <param name="length">生成长度</param>
18 public static string Number(int Length)
19 {
20 return Number(Length, false);
21 }
22
23 /// <summary>
24 /// 生成随机数字
25 /// </summary>
26 /// <param name="Length">生成长度</param>
27 /// <param name="Sleep">是否要在生成前将当前线程阻止以避免重复</param>
28 public static string Number(int Length, bool Sleep)
29 {
30 if (Sleep) System.Threading.Thread.Sleep(3);
31 string result = "";
32 System.Random random = new Random();
33 for (int i = 0; i < Length; i++)
34 {
35 result += random.Next(10).ToString();
36 }
37 return result;
38 }
39 #endregion
40
41 #region 生成随机字母与数字
42 /// <summary>
43 /// 生成随机字母与数字
44 /// </summary>
45 /// <param name="IntStr">生成长度</param>
46 public static string Str(int Length)
47 {
48 return Str(Length, false);
49 }
50
51 /// <summary>
52 /// 生成随机字母与数字
53 /// </summary>
54 /// <param name="Length">生成长度</param>
55 /// <param name="Sleep">是否要在生成前将当前线程阻止以避免重复</param>
56 public static string Str(int Length, bool Sleep)
57 {
58 if (Sleep) System.Threading.Thread.Sleep(3);
59 char[] Pattern = new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z' };
60 string result = "";
61 int n = Pattern.Length;
62 System.Random random = new Random(~unchecked((int)DateTime.Now.Ticks));
63 for (int i = 0; i < Length; i++)
64 {
65 int rnd = random.Next(0, n);
66 result += Pattern[rnd];
67 }
68 return result;
69 }
70 #endregion
71
72 #region 生成随机纯字母随机数
73 /// <summary>
74 /// 生成随机纯字母随机数
75 /// </summary>
76 /// <param name="IntStr">生成长度</param>
77 public static string Str_char(int Length)
78 {
79 return Str_char(Length, false);
80 }
81
82 /// <summary>
83 /// 生成随机纯字母随机数
84 /// </summary>
85 /// <param name="Length">生成长度</param>
86 /// <param name="Sleep">是否要在生成前将当前线程阻止以避免重复</param>
87 public static string Str_char(int Length, bool Sleep)
88 {
89 if (Sleep) System.Threading.Thread.Sleep(3);
90 char[] Pattern = new char[] { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z' };
91 string result = "";
92 int n = Pattern.Length;
93 System.Random random = new Random(~unchecked((int)DateTime.Now.Ticks));
94 for (int i = 0; i < Length; i++)
95 {
96 int rnd = random.Next(0, n);
97 result += Pattern[rnd];
98 }
99 return result;
100 }
101 #endregion
102 }
103
104 /// <summary>
105 /// 验证图片类
106 /// </summary>
107 public class YZMHelper
108 {
109 #region 私有字段
110 private string text;
111 private Bitmap image;
112 private int letterCount = 4; //验证码位数
113 private int letterWidth = 16; //单个字体的宽度范围
114 private int letterHeight = 20; //单个字体的高度范围
115 private static byte[] randb = new byte[4];
116 private static RNGCryptoServiceProvider rand = new RNGCryptoServiceProvider();
117 private Font[] fonts =
118 {
119 new Font(new FontFamily("Times New Roman"),10 +Next(1),System.Drawing.FontStyle.Regular),
120 new Font(new FontFamily("Georgia"), 10 + Next(1),System.Drawing.FontStyle.Regular),
121 new Font(new FontFamily("Arial"), 10 + Next(1),System.Drawing.FontStyle.Regular),
122 new Font(new FontFamily("Comic Sans MS"), 10 + Next(1),System.Drawing.FontStyle.Regular)
123 };
124 #endregion
125
126 #region 公有属性
127 /// <summary>
128 /// 验证码
129 /// </summary>
130 public string Text
131 {
132 get { return this.text; }
133 }
134
135 /// <summary>
136 /// 验证码图片
137 /// </summary>
138 public Bitmap Image
139 {
140 get { return this.image; }
141 }
142 #endregion
143
144 #region 构造函数
145 public YZMHelper()
146 {
147 HttpContext.Current.Response.Expires = 0;
148 HttpContext.Current.Response.Buffer = true;
149 HttpContext.Current.Response.ExpiresAbsolute = DateTime.Now.AddSeconds(-1);
150 HttpContext.Current.Response.AddHeader("pragma", "no-cache");
151 HttpContext.Current.Response.CacheControl = "no-cache";
152 this.text = Rand.Number(4);
153 CreateImage();
154 }
155 #endregion
156
157 #region 私有方法
158 /// <summary>
159 /// 获得下一个随机数
160 /// </summary>
161 /// <param name="max">最大值</param>
162 private static int Next(int max)
163 {
164 rand.GetBytes(randb);
165 int value = BitConverter.ToInt32(randb, 0);
166 value = value % (max + 1);
167 if (value < 0) value = -value;
168 return value;
169 }
170
171 /// <summary>
172 /// 获得下一个随机数
173 /// </summary>
174 /// <param name="min">最小值</param>
175 /// <param name="max">最大值</param>
176 private static int Next(int min, int max)
177 {
178 int value = Next(max - min) + min;
179 return value;
180 }
181 #endregion
182
183 #region 公共方法
184 /// <summary>
185 /// 绘制验证码
186 /// </summary>
187 public void CreateImage()
188 {
189 int int_ImageWidth = this.text.Length * letterWidth;
190 Bitmap image = new Bitmap(int_ImageWidth, letterHeight);
191 Graphics g = Graphics.FromImage(image);
192 g.Clear(Color.White);
193 for (int i = 0; i < 2; i++)
194 {
195 int x1 = Next(image.Width - 1);
196 int x2 = Next(image.Width - 1);
197 int y1 = Next(image.Height - 1);
198 int y2 = Next(image.Height - 1);
199 g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
200 }
201 int _x = -12, _y = 0;
202 for (int int_index = 0; int_index < this.text.Length; int_index++)
203 {
204 _x += Next(12, 16);
205 _y = Next(-2, 2);
206 string str_char = this.text.Substring(int_index, 1);
207 str_char = Next(1) == 1 ? str_char.ToLower() : str_char.ToUpper();
208 Brush newBrush = new SolidBrush(GetRandomColor());
209 Point thePos = new Point(_x, _y);
210 g.DrawString(str_char, fonts[Next(fonts.Length - 1)], newBrush, thePos);
211 }
212 for (int i = 0; i < 10; i++)
213 {
214 int x = Next(image.Width - 1);
215 int y = Next(image.Height - 1);
216 image.SetPixel(x, y, Color.FromArgb(Next(0, 255), Next(0, 255), Next(0, 255)));
217 }
218 image = TwistImage(image, true, Next(1, 3), Next(4, 6));
219 g.DrawRectangle(new Pen(Color.LightGray, 1), 0, 0, int_ImageWidth - 1, (letterHeight - 1));
220 this.image = image;
221 }
222
223 /// <summary>
224 /// 字体随机颜色
225 /// </summary>
226 public Color GetRandomColor()
227 {
228 Random RandomNum_First = new Random((int)DateTime.Now.Ticks);
229 System.Threading.Thread.Sleep(RandomNum_First.Next(50));
230 Random RandomNum_Sencond = new Random((int)DateTime.Now.Ticks);
231 int int_Red = RandomNum_First.Next(180);
232 int int_Green = RandomNum_Sencond.Next(180);
233 int int_Blue = (int_Red + int_Green > 300) ? 0 : 400 - int_Red - int_Green;
234 int_Blue = (int_Blue > 255) ? 255 : int_Blue;
235 return Color.FromArgb(int_Red, int_Green, int_Blue);
236 }
237
238 /// <summary>
239 /// 正弦曲线Wave扭曲图片
240 /// </summary>
241 /// <param name="srcBmp">图片路径</param>
242 /// <param name="bXDir">如果扭曲则选择为True</param>
243 /// <param name="nMultValue">波形的幅度倍数，越大扭曲的程度越高,一般为3</param>
244 /// <param name="dPhase">波形的起始相位,取值区间[0-2*PI)</param>
245 public System.Drawing.Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase)
246 {
247 double PI = 6.283185307179586476925286766559;
248 Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height);
249 Graphics graph = Graphics.FromImage(destBmp);
250 graph.FillRectangle(new SolidBrush(Color.White), 0, 0, destBmp.Width, destBmp.Height);
251 graph.Dispose();
252 double dBaseAxisLen = bXDir ? (double)destBmp.Height : (double)destBmp.Width;
253 for (int i = 0; i < destBmp.Width; i++)
254 {
255 for (int j = 0; j < destBmp.Height; j++)
256 {
257 double dx = 0;
258 dx = bXDir ? (PI * (double)j) / dBaseAxisLen : (PI * (double)i) / dBaseAxisLen;
259 dx += dPhase;
260 double dy = Math.Sin(dx);
261 int nOldX = 0, nOldY = 0;
262 nOldX = bXDir ? i + (int)(dy * dMultValue) : i;
263 nOldY = bXDir ? j : j + (int)(dy * dMultValue);
264
265 Color color = srcBmp.GetPixel(i, j);
266 if (nOldX >= 0 && nOldX < destBmp.Width
267 && nOldY >= 0 && nOldY < destBmp.Height)
268 {
269 destBmp.SetPixel(nOldX, nOldY, color);
270 }
271 }
272 }
273 srcBmp.Dispose();
274 return destBmp;
275 }
276 #endregion
277 }
278 }
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