中文彩色驗證碼實現（變形/噪點/點選更換
1using System;
2using System.Data;
3using System.Configuration;
4using System.Web;
5using System.Web.Security;
6using System.Web.UI;
7using System.Web.UI.WebControls;
8using System.Web.UI.WebControls.WebParts;
9using System.Web.UI.HtmlControls;
10using System.Drawing;
11using System.Text;
12
13/**//// <summary>
14/// VryImgGen 的摘要說明
15/// </summary>
16public class VryImgGen
17...{
18 public static string ChineseChars = String.Empty;
19
20 /**//// <summary>
21 /// 英文與數字串
22 /// </summary>
23 protected static readonly string EnglishOrNumChars = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
24
25 public VryImgGen()
26 ...{
27 rnd = new Random(unchecked((int)DateTime.Now.Ticks));
28 }
29//該原始碼下載自www.51aspx.com(５１ａｓｐｘ．ｃｏｍ)
30
31 /**//// <summary>
32 /// 全域性隨機數生成器
33 /// </summary>
34 private Random rnd;
35
36 int length = 5;
37 /**//// <summary>
38 /// 驗證碼長度(預設6個驗證碼的長度)
39 /// </summary>
40 public int Length
41 ...{
42 get ...{ return length; }
43 set ...{ length = value; }
44 }
45
46 int fontSize = 18;
47 /**//// <summary>
48 /// 驗證碼字型大小(為了顯示扭曲效果，預設30畫素，可以自行修改)
49 /// </summary>
50 public int FontSize
51 ...{
52 get ...{ return fontSize; }
53 set ...{ fontSize = value; }
54 }
55
56 int padding = 4;
57 /**//// <summary>
58 /// 邊框補(預設4畫素)
59 /// </summary>
60 public int Padding
61 ...{
62 get ...{ return padding; }
63 set ...{ padding = value; }
64 }
65
66 bool chaos = true;
67 /**//// <summary>
68 /// 是否輸出燥點(預設輸出)
69 /// </summary>
70 public bool Chaos
71 ...{
72 get ...{ return chaos; }
73 set ...{ chaos = value; }
74 }
75
76 Color chaosColor = Color.LightGray;
77 /**//// <summary>
78 /// 輸出燥點的顏色(預設灰色)
79 /// </summary>
80 public Color ChaosColor
81 ...{
82 get ...{ return chaosColor; }
83 set ...{ chaosColor = value; }
84 }
85
86 Color backgroundColor = Color.White;
87 /**//// <summary>
88 /// 自定義背景色(預設白色)
89 /// </summary>
90 public Color BackgroundColor
91 ...{
92 get ...{ return backgroundColor; }
93 set ...{ backgroundColor = value; }
94 }
95
96 Color[] colors = ...{ Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };
97 /**//// <summary>
98 /// 自定義隨機顏色陣列
99 /// </summary>
100 public Color[] Colors
101 ...{
102 get ...{ return colors; }
103 set ...{ colors = value; }
104 }
105
106 string[] fonts = ...{ "Arial", "Georgia" };
107 /**//// <summary>
108 /// 自定義字型陣列
109 /// </summary>
110 public string[] Fonts
111 ...{
112 get ...{ return fonts; }
113 set ...{ fonts = value; }
114 }
115
116 產生波形濾鏡效果#region 產生波形濾鏡效果
117
118 private const double PI = 3.1415926535897932384626433832795;
119 private const double PI2 = 6.283185307179586476925286766559;
120
121 /**//// <summary>
122 /// 正弦曲線Wave扭曲圖片（Edit By 51aspx.com）
123 /// </summary>
124 /// <param name="srcBmp">圖片路徑</param>
125 /// <param name="bXDir">如果扭曲則選擇為True</param>
126 /// <param name="nMultValue">波形的幅度倍數，越大扭曲的程度越高，一般為3</param>
127 /// <param name="dPhase">波形的起始相位，取值區間[0-2*PI)</param>
128 /// <returns></returns>
129 public System.Drawing.Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase)
130 ...{
131 System.Drawing.Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height);
132
133 // 將點陣圖背景填充為白色
134 System.Drawing.Graphics graph = System.Drawing.Graphics.FromImage(destBmp);
135 graph.FillRectangle(new SolidBrush(System.Drawing.Color.White), 0, 0, destBmp.Width, destBmp.Height);
136 graph.Dispose();
137
138 double dBaseAxisLen = bXDir ? (double)destBmp.Height : (double)destBmp.Width;
139
140 for (int i = 0; i < destBmp.Width; i++)
141 ...{
142 for (int j = 0; j < destBmp.Height; j++)
143 ...{
144 double dx = 0;
145 dx = bXDir ? (PI2 * (double)j) / dBaseAxisLen : (PI2 * (double)i) / dBaseAxisLen;
146 dx += dPhase;
147 double dy = Math.Sin(dx);
148
149 // 取得當前點的顏色
150 int nOldX = 0, nOldY = 0;
151 nOldX = bXDir ? i + (int)(dy * dMultValue) : i;
152 nOldY = bXDir ? j : j + (int)(dy * dMultValue);
153
154 System.Drawing.Color color = srcBmp.GetPixel(i, j);
155 if (nOldX >= 0 && nOldX < destBmp.Width
156 && nOldY >= 0 && nOldY < destBmp.Height)
157 ...{
158 destBmp.SetPixel(nOldX, nOldY, color);
159 }
160 }
161 }
162
163 return destBmp;
164 }
165
166
167
168 #endregion
169
170 /**//// <summary>
171 /// 生成校驗碼圖片
172 /// </summary>
173 /// <param name="code">驗證碼</param>
174 /// <returns></returns>
175 public Bitmap CreateImage(string code)
176 ...{
177 int fSize = FontSize;
178 int fWidth = fSize + Padding;
179
180 int imageWidth = (int)(code.Length * fWidth) + 4 + Padding * 2;
181 int imageHeight = fSize * 2 + Padding * 2;
182
183 System.Drawing.Bitmap image = new System.Drawing.Bitmap(imageWidth, imageHeight);
184
185 Graphics g = Graphics.FromImage(image);
186
187 g.Clear(BackgroundColor);
188
189 //給背景新增隨機生成的燥點
190 if (this.Chaos)
191 ...{
192
193 Pen pen = new Pen(ChaosColor, 0);
194 int c = Length * 10;
195
196 for (int i = 0; i < c; i++)
197 ...{
198 int x = rnd.Next(image.Width);
199 int y = rnd.Next(image.Height);
200
201 g.DrawRectangle(pen, x, y, 1, 1);
202 }
203 }
204
205 int left = 0, top = 0, top1 = 1, top2 = 1;
206
207 int n1 = (imageHeight - FontSize - Padding * 2);
208 int n2 = n1 / 4;
209 top1 = n2;
210 top2 = n2 * 2;
211
212 Font f;
213 Brush b;
214
215 int cindex, findex;
216
217 //隨機字型和顏色的驗證碼字元
218 for (int i = 0; i < code.Length; i++)
219 ...{
220 cindex = rnd.Next(Colors.Length - 1);
221 findex = rnd.Next(Fonts.Length - 1);
222
223 f = new System.Drawing.Font(Fonts[findex], fSize, System.Drawing.FontStyle.Bold);
224 b = new System.Drawing.SolidBrush(Colors[cindex]);
225
226 if (i % 2 == 1)
227 ...{
228 top = top2;
229 }
230 else
231 ...{
232 top = top1;
233 }
234
235 left = i * fWidth;
236
237 g.DrawString(code.Substring(i, 1), f, b, left, top);
238 }
239
240 //畫一個邊框 邊框顏色為Color.Gainsboro
241 g.DrawRectangle(new Pen(Color.Gainsboro, 0), 0, 0, image.Width - 1, image.Height - 1);
242 g.Dispose();
243
244 //產生波形（Add By 51aspx.com）
245 image = TwistImage(image, true, 8, 4);
246
247 return image;
248 }
249
250 /**//// <summary>
251 /// 生成隨機字元碼
252 /// </summary>
253 /// <param name="codeLen">字串長度</param>
254 /// <param name="zhCharsCount">中文字元數</param>
255 /// <returns></returns>
256 public string CreateVerifyCode(int codeLen, int zhCharsCount)
257 ...{
258 char[] chs = new char[codeLen];
259
260 int index;
261 for (int i = 0; i < zhCharsCount; i++)
262 ...{
263 index = rnd.Next(0, codeLen);
264 if (chs[index] == '/0')
265 chs[index] = CreateZhChar();
266 else
267 --i;
268 }
269 for (int i = 0; i < codeLen; i++)
270 ...{
271 if (chs[i] == '/0')
272 chs[i] = CreateEnOrNumChar();
273 }
274
275 return new string(chs, 0, chs.Length);
276 }
277
278 /**//// <summary>
279 /// 生成預設長度5的隨機字元碼
280 /// </summary>
281 /// <returns></returns>
282 public string CreateVerifyCode()
283 ...{
284 return CreateVerifyCode(Length, 0);
285 }
286
287 /**//// <summary>
288 /// 生成英文或數字字元
289 /// </summary>
290 /// <returns></returns>
291 protected char CreateEnOrNumChar()
292 ...{
293 return EnglishOrNumChars[rnd.Next(0, EnglishOrNumChars.Length)];
294 }
295
296 /**//// <summary>
297 /// 生成漢字字元
298 /// </summary>
299 /// <returns></returns>
300 protected char CreateZhChar()
301 ...{
302 //若提供了漢字集，查詢漢字集選取漢字
303 if (ChineseChars.Length > 0)
304 ...{
305 return ChineseChars[rnd.Next(0, ChineseChars.Length)];
306 }
307 //若沒有提供漢字集，則根據《GB2312簡體中文編碼表》編碼規則構造漢字
308 else
309 ...{
310 byte[] bytes = new byte[2];
311
312 //第一個位元組值在0xb0, 0xf7之間
313 bytes[0] = (byte)rnd.Next(0xb0, 0xf8);
314 //第二個位元組值在0xa1, 0xfe之間
315 bytes[1] = (byte)rnd.Next(0xa1, 0xff);
316
317 //根據漢字編碼的位元組陣列解碼出中文漢字
318 string str1 = Encoding.GetEncoding("gb2312").GetString(bytes);
319
320 return str1[0];
321 }
322 }
323
324}
325
2using System.Data;
3using System.Configuration;
4using System.Web;
5using System.Web.Security;
6using System.Web.UI;
7using System.Web.UI.WebControls;
8using System.Web.UI.WebControls.WebParts;
9using System.Web.UI.HtmlControls;
10using System.Drawing;
11using System.Text;
12
13/**//// <summary>
14/// VryImgGen 的摘要說明
15/// </summary>
16public class VryImgGen
17...{
18 public static string ChineseChars = String.Empty;
19
20 /**//// <summary>
21 /// 英文與數字串
22 /// </summary>
23 protected static readonly string EnglishOrNumChars = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
24
25 public VryImgGen()
26 ...{
27 rnd = new Random(unchecked((int)DateTime.Now.Ticks));
28 }
29//該原始碼下載自www.51aspx.com(５１ａｓｐｘ．ｃｏｍ)
30
31 /**//// <summary>
32 /// 全域性隨機數生成器
33 /// </summary>
34 private Random rnd;
35
36 int length = 5;
37 /**//// <summary>
38 /// 驗證碼長度(預設6個驗證碼的長度)
39 /// </summary>
40 public int Length
41 ...{
42 get ...{ return length; }
43 set ...{ length = value; }
44 }
45
46 int fontSize = 18;
47 /**//// <summary>
48 /// 驗證碼字型大小(為了顯示扭曲效果，預設30畫素，可以自行修改)
49 /// </summary>
50 public int FontSize
51 ...{
52 get ...{ return fontSize; }
53 set ...{ fontSize = value; }
54 }
55
56 int padding = 4;
57 /**//// <summary>
58 /// 邊框補(預設4畫素)
59 /// </summary>
60 public int Padding
61 ...{
62 get ...{ return padding; }
63 set ...{ padding = value; }
64 }
65
66 bool chaos = true;
67 /**//// <summary>
68 /// 是否輸出燥點(預設輸出)
69 /// </summary>
70 public bool Chaos
71 ...{
72 get ...{ return chaos; }
73 set ...{ chaos = value; }
74 }
75
76 Color chaosColor = Color.LightGray;
77 /**//// <summary>
78 /// 輸出燥點的顏色(預設灰色)
79 /// </summary>
80 public Color ChaosColor
81 ...{
82 get ...{ return chaosColor; }
83 set ...{ chaosColor = value; }
84 }
85
86 Color backgroundColor = Color.White;
87 /**//// <summary>
88 /// 自定義背景色(預設白色)
89 /// </summary>
90 public Color BackgroundColor
91 ...{
92 get ...{ return backgroundColor; }
93 set ...{ backgroundColor = value; }
94 }
95
96 Color[] colors = ...{ Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };
97 /**//// <summary>
98 /// 自定義隨機顏色陣列
99 /// </summary>
100 public Color[] Colors
101 ...{
102 get ...{ return colors; }
103 set ...{ colors = value; }
104 }
105
106 string[] fonts = ...{ "Arial", "Georgia" };
107 /**//// <summary>
108 /// 自定義字型陣列
109 /// </summary>
110 public string[] Fonts
111 ...{
112 get ...{ return fonts; }
113 set ...{ fonts = value; }
114 }
115
116 產生波形濾鏡效果#region 產生波形濾鏡效果
117
118 private const double PI = 3.1415926535897932384626433832795;
119 private const double PI2 = 6.283185307179586476925286766559;
120
121 /**//// <summary>
122 /// 正弦曲線Wave扭曲圖片（Edit By 51aspx.com）
123 /// </summary>
124 /// <param name="srcBmp">圖片路徑</param>
125 /// <param name="bXDir">如果扭曲則選擇為True</param>
126 /// <param name="nMultValue">波形的幅度倍數，越大扭曲的程度越高，一般為3</param>
127 /// <param name="dPhase">波形的起始相位，取值區間[0-2*PI)</param>
128 /// <returns></returns>
129 public System.Drawing.Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase)
130 ...{
131 System.Drawing.Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height);
132
133 // 將點陣圖背景填充為白色
134 System.Drawing.Graphics graph = System.Drawing.Graphics.FromImage(destBmp);
135 graph.FillRectangle(new SolidBrush(System.Drawing.Color.White), 0, 0, destBmp.Width, destBmp.Height);
136 graph.Dispose();
137
138 double dBaseAxisLen = bXDir ? (double)destBmp.Height : (double)destBmp.Width;
139
140 for (int i = 0; i < destBmp.Width; i++)
141 ...{
142 for (int j = 0; j < destBmp.Height; j++)
143 ...{
144 double dx = 0;
145 dx = bXDir ? (PI2 * (double)j) / dBaseAxisLen : (PI2 * (double)i) / dBaseAxisLen;
146 dx += dPhase;
147 double dy = Math.Sin(dx);
148
149 // 取得當前點的顏色
150 int nOldX = 0, nOldY = 0;
151 nOldX = bXDir ? i + (int)(dy * dMultValue) : i;
152 nOldY = bXDir ? j : j + (int)(dy * dMultValue);
153
154 System.Drawing.Color color = srcBmp.GetPixel(i, j);
155 if (nOldX >= 0 && nOldX < destBmp.Width
156 && nOldY >= 0 && nOldY < destBmp.Height)
157 ...{
158 destBmp.SetPixel(nOldX, nOldY, color);
159 }
160 }
161 }
162
163 return destBmp;
164 }
165
166
167
168 #endregion
169
170 /**//// <summary>
171 /// 生成校驗碼圖片
172 /// </summary>
173 /// <param name="code">驗證碼</param>
174 /// <returns></returns>
175 public Bitmap CreateImage(string code)
176 ...{
177 int fSize = FontSize;
178 int fWidth = fSize + Padding;
179
180 int imageWidth = (int)(code.Length * fWidth) + 4 + Padding * 2;
181 int imageHeight = fSize * 2 + Padding * 2;
182
183 System.Drawing.Bitmap image = new System.Drawing.Bitmap(imageWidth, imageHeight);
184
185 Graphics g = Graphics.FromImage(image);
186
187 g.Clear(BackgroundColor);
188
189 //給背景新增隨機生成的燥點
190 if (this.Chaos)
191 ...{
192
193 Pen pen = new Pen(ChaosColor, 0);
194 int c = Length * 10;
195
196 for (int i = 0; i < c; i++)
197 ...{
198 int x = rnd.Next(image.Width);
199 int y = rnd.Next(image.Height);
200
201 g.DrawRectangle(pen, x, y, 1, 1);
202 }
203 }
204
205 int left = 0, top = 0, top1 = 1, top2 = 1;
206
207 int n1 = (imageHeight - FontSize - Padding * 2);
208 int n2 = n1 / 4;
209 top1 = n2;
210 top2 = n2 * 2;
211
212 Font f;
213 Brush b;
214
215 int cindex, findex;
216
217 //隨機字型和顏色的驗證碼字元
218 for (int i = 0; i < code.Length; i++)
219 ...{
220 cindex = rnd.Next(Colors.Length - 1);
221 findex = rnd.Next(Fonts.Length - 1);
222
223 f = new System.Drawing.Font(Fonts[findex], fSize, System.Drawing.FontStyle.Bold);
224 b = new System.Drawing.SolidBrush(Colors[cindex]);
225
226 if (i % 2 == 1)
227 ...{
228 top = top2;
229 }
230 else
231 ...{
232 top = top1;
233 }
234
235 left = i * fWidth;
236
237 g.DrawString(code.Substring(i, 1), f, b, left, top);
238 }
239
240 //畫一個邊框 邊框顏色為Color.Gainsboro
241 g.DrawRectangle(new Pen(Color.Gainsboro, 0), 0, 0, image.Width - 1, image.Height - 1);
242 g.Dispose();
243
244 //產生波形（Add By 51aspx.com）
245 image = TwistImage(image, true, 8, 4);
246
247 return image;
248 }
249
250 /**//// <summary>
251 /// 生成隨機字元碼
252 /// </summary>
253 /// <param name="codeLen">字串長度</param>
254 /// <param name="zhCharsCount">中文字元數</param>
255 /// <returns></returns>
256 public string CreateVerifyCode(int codeLen, int zhCharsCount)
257 ...{
258 char[] chs = new char[codeLen];
259
260 int index;
261 for (int i = 0; i < zhCharsCount; i++)
262 ...{
263 index = rnd.Next(0, codeLen);
264 if (chs[index] == '/0')
265 chs[index] = CreateZhChar();
266 else
267 --i;
268 }
269 for (int i = 0; i < codeLen; i++)
270 ...{
271 if (chs[i] == '/0')
272 chs[i] = CreateEnOrNumChar();
273 }
274
275 return new string(chs, 0, chs.Length);
276 }
277
278 /**//// <summary>
279 /// 生成預設長度5的隨機字元碼
280 /// </summary>
281 /// <returns></returns>
282 public string CreateVerifyCode()
283 ...{
284 return CreateVerifyCode(Length, 0);
285 }
286
287 /**//// <summary>
288 /// 生成英文或數字字元
289 /// </summary>
290 /// <returns></returns>
291 protected char CreateEnOrNumChar()
292 ...{
293 return EnglishOrNumChars[rnd.Next(0, EnglishOrNumChars.Length)];
294 }
295
296 /**//// <summary>
297 /// 生成漢字字元
298 /// </summary>
299 /// <returns></returns>
300 protected char CreateZhChar()
301 ...{
302 //若提供了漢字集，查詢漢字集選取漢字
303 if (ChineseChars.Length > 0)
304 ...{
305 return ChineseChars[rnd.Next(0, ChineseChars.Length)];
306 }
307 //若沒有提供漢字集，則根據《GB2312簡體中文編碼表》編碼規則構造漢字
308 else
309 ...{
310 byte[] bytes = new byte[2];
311
312 //第一個位元組值在0xb0, 0xf7之間
313 bytes[0] = (byte)rnd.Next(0xb0, 0xf8);
314 //第二個位元組值在0xa1, 0xfe之間
315 bytes[1] = (byte)rnd.Next(0xa1, 0xff);
316
317 //根據漢字編碼的位元組陣列解碼出中文漢字
318 string str1 = Encoding.GetEncoding("gb2312").GetString(bytes);
319
320 return str1[0];
321 }
322 }
323
324}
325
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