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注册时的图片验证码

生成图片验证码

  1 using System;
  2 using System.Data;
  3 using System.Configuration;
  4 using System.Web;
  5 using System.Web.Security;
  6 using System.Web.UI;
  7 using System.Web.UI.HtmlControls;
  8 using System.Web.UI.WebControls;
  9 using System.Web.UI.WebControls.WebParts;
 10 using System.Xml.Linq;
 11 using System.Drawing;
 12 using System.Text;
 13 
 14 /// <summary>
 15 /// VdCode 的摘要说明
 16 /// </summary>
 17 public class VdCode
 18 {
 19     /// <summary>
 20     /// 全局随机数生成器
 21     /// </summary>
 22     private Random rndNumber;
 23     public static string mrChineseChars = String.Empty;
 24     /// <summary>
 25     /// 英文与数字串
 26     /// </summary>
 27     // protected static readonly string mrEnglishOrNumChars = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
 28     protected static readonly string mrEnglishOrNumChars = "0123456789";
 29 
 30     public 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)
 35     int length = 5;
 36     public int Length
 37     {
 38         get { return length; }
 39         set { length = value; }
 40     }
 41     //验证码字体大小
 42     // int fontSize = 18;
 43     int fontSize = 18;
 44     public int FontSize
 45     {
 46         get { return fontSize; }
 47         set { fontSize = value; }
 48     }
 49     // 边框补(默认4像素)
 50     //int padding = 4;
 51     int padding = 4;
 52     public int Padding
 53     {
 54         get { return padding; }
 55         set { padding = value; }
 56     }
 57     // 是否输出燥点(默认输出)
 58     bool chaos = true;
 59     public bool Chaos
 60     {
 61         get { return chaos; }
 62         set { chaos = value; }
 63     }
 64     // 输出燥点的颜色(默认灰色)
 65     Color chaosColor = Color.LightGray;
 66     public Color ChaosColor
 67     {
 68         get { return chaosColor; }
 69         set { chaosColor = value; }
 70     }
 71     // 自定义背景色(默认白色)
 72     Color backgroundColor = Color.White;
 73     public Color BackgroundColor
 74     {
 75         get { return backgroundColor; }
 76         set { 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 };
 80     public Color[] Colors
 81     {
 82         get { return colors; }
 83         set { colors = value; }
 84     }
 85     // 自定义字体数组
 86     string[] fonts = { "Arial", "Georgia" };
 87     public string[] Fonts
 88     {
 89         get { return fonts; }
 90         set { fonts = value; }
 91     }
 92     #region 产生扭曲图片
 93     private const double PI = 3.1415926535897932384626433832795;
 94     private 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>
105     public 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
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
112         double dBaseAxisLen = bXDir ? (double)destBmp.Height : (double)destBmp.Width;//判断扭曲方式
113         for (int i = 0; i < destBmp.Width; i++)
114         {
115             for (int j = 0; j < destBmp.Height; j++)
116             {
117                 double dx = 0;
118                 dx = bXDir ? (PI2 * (double)j) / dBaseAxisLen : (PI2 * (double)i) / dBaseAxisLen;
119                 dx += dPhase;
120                 double dy = Math.Sin(dx);
121                 // 取得当前点的颜色
122                 int 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);
126                 if (nOldX >= 0 && nOldX < destBmp.Width
127                  && nOldY >= 0 && nOldY < destBmp.Height)
128                 {
129                     destBmp.SetPixel(nOldX, nOldY, color);
130                 }
131             }
132         }
133         return 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>
141     public Bitmap CreateImage(string code)
142     {
143         int fSize = FontSize;
144         int fWidth = fSize + Padding;
145         int imageWidth = (int)(code.Length * fWidth) + 4 + Padding * 2;
146         int 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
151         if (this.Chaos)
152         {
153             Pen pen = new Pen(ChaosColor, 0);
154             int c = Length * 10;
155             for (int i = 0; i < c; i++)
156             {
157                 int x = rndNumber.Next(image.Width);
158                 int y = rndNumber.Next(image.Height);
159 
160                 g.DrawRectangle(pen, x, y, 1, 1);
161             }
162         }
163         int left = 0, top = 0, top1 = 1, top2 = 1;
164         int n1 = (imageHeight - FontSize - Padding * 2);
165         int n2 = n1 / 4;
166         top1 = n2;
167         top2 = n2 * 2;
168         Font f;
169         Brush b;
170         int cindex, findex;
171         //随机字体和颜色的验证码字符
172         for (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]);
178             if (i % 2 == 1)
179             {
180                 top = top2;
181             }
182             else
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.com）
193         //image = TwistImage(image, true, 8, 4);
194         image = TwistImage(image, false, 0, 0);
195         return 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>
203     public string CreateVerifyCode(int codeLen, int zhCharsCount)
204     {
205         char[] chs = new char[codeLen];
206 
207         int index;
208         for (int i = 0; i < zhCharsCount; i++)
209         {
210             index = rndNumber.Next(0, codeLen);
211             if (chs[index] == '')
212                 chs[index] = CreateZhChar();
213             else
214                 --i;
215         }
216         for (int i = 0; i < codeLen; i++)
217         {
218             if (chs[i] == '')
219                 chs[i] = CreateEnOrNumChar();
220         }
221 
222         return new string(chs, 0, chs.Length);
223     }
224     // 生成默认长度5的随机字符码
225     public string CreateVerifyCode()
226     {
227         return CreateVerifyCode(Length, 0);
228     }
229     // 生成英文或数字字符
230     protected char CreateEnOrNumChar()
231     {
232         return mrEnglishOrNumChars[rndNumber.Next(0, mrEnglishOrNumChars.Length)];
233     }
234     protected 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
237         if (mrChineseChars.Length > 0)
238         {
239             return 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
242         else
243         {
244             byte[] bytes = new byte[2];
245 
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
252             string str1 = Encoding.GetEncoding("gb2312").GetString(bytes);
253 
254             return str1[0];
255         }
256     }
257 }

View Code

调用56短信王的短信接口

  1 using System;
  2 using System.Data;
  3 using System.Configuration;
  4 using System.Web;
  5 using System.Web.Security;
  6 using System.Web.UI;
  7 using System.Web.UI.HtmlControls;
  8 using System.Web.UI.WebControls;
  9 using System.Web.UI.WebControls.WebParts;
 10 using System.Xml.Linq;
 11 using System.Drawing;
 12 using System.Text;
 13 
 14 /// <summary>
 15 /// VdCode 的摘要说明
 16 /// </summary>
 17 public class VdCode
 18 {
 19     /// <summary>
 20     /// 全局随机数生成器
 21     /// </summary>
 22     private Random rndNumber;
 23     public static string mrChineseChars = String.Empty;
 24     /// <summary>
 25     /// 英文与数字串
 26     /// </summary>
 27     // protected static readonly string mrEnglishOrNumChars = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
 28     protected static readonly string mrEnglishOrNumChars = "0123456789";
 29 
 30     public 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)
 35     int length = 5;
 36     public int Length
 37     {
 38         get { return length; }
 39         set { length = value; }
 40     }
 41     //验证码字体大小
 42     // int fontSize = 18;
 43     int fontSize = 18;
 44     public int FontSize
 45     {
 46         get { return fontSize; }
 47         set { fontSize = value; }
 48     }
 49     // 边框补(默认4像素)
 50     //int padding = 4;
 51     int padding = 4;
 52     public int Padding
 53     {
 54         get { return padding; }
 55         set { padding = value; }
 56     }
 57     // 是否输出燥点(默认输出)
 58     bool chaos = true;
 59     public bool Chaos
 60     {
 61         get { return chaos; }
 62         set { chaos = value; }
 63     }
 64     // 输出燥点的颜色(默认灰色)
 65     Color chaosColor = Color.LightGray;
 66     public Color ChaosColor
 67     {
 68         get { return chaosColor; }
 69         set { chaosColor = value; }
 70     }
 71     // 自定义背景色(默认白色)
 72     Color backgroundColor = Color.White;
 73     public Color BackgroundColor
 74     {
 75         get { return backgroundColor; }
 76         set { 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 };
 80     public Color[] Colors
 81     {
 82         get { return colors; }
 83         set { colors = value; }
 84     }
 85     // 自定义字体数组
 86     string[] fonts = { "Arial", "Georgia" };
 87     public string[] Fonts
 88     {
 89         get { return fonts; }
 90         set { fonts = value; }
 91     }
 92     #region 产生扭曲图片
 93     private const double PI = 3.1415926535897932384626433832795;
 94     private 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>
105     public 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
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
112         double dBaseAxisLen = bXDir ? (double)destBmp.Height : (double)destBmp.Width;//判断扭曲方式
113         for (int i = 0; i < destBmp.Width; i++)
114         {
115             for (int j = 0; j < destBmp.Height; j++)
116             {
117                 double dx = 0;
118                 dx = bXDir ? (PI2 * (double)j) / dBaseAxisLen : (PI2 * (double)i) / dBaseAxisLen;
119                 dx += dPhase;
120                 double dy = Math.Sin(dx);
121                 // 取得当前点的颜色
122                 int 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);
126                 if (nOldX >= 0 && nOldX < destBmp.Width
127                  && nOldY >= 0 && nOldY < destBmp.Height)
128                 {
129                     destBmp.SetPixel(nOldX, nOldY, color);
130                 }
131             }
132         }
133         return 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>
141     public Bitmap CreateImage(string code)
142     {
143         int fSize = FontSize;
144         int fWidth = fSize + Padding;
145         int imageWidth = (int)(code.Length * fWidth) + 4 + Padding * 2;
146         int 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
151         if (this.Chaos)
152         {
153             Pen pen = new Pen(ChaosColor, 0);
154             int c = Length * 10;
155             for (int i = 0; i < c; i++)
156             {
157                 int x = rndNumber.Next(image.Width);
158                 int y = rndNumber.Next(image.Height);
159 
160                 g.DrawRectangle(pen, x, y, 1, 1);
161             }
162         }
163         int left = 0, top = 0, top1 = 1, top2 = 1;
164         int n1 = (imageHeight - FontSize - Padding * 2);
165         int n2 = n1 / 4;
166         top1 = n2;
167         top2 = n2 * 2;
168         Font f;
169         Brush b;
170         int cindex, findex;
171         //随机字体和颜色的验证码字符
172         for (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]);
178             if (i % 2 == 1)
179             {
180                 top = top2;
181             }
182             else
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.com）
193         //image = TwistImage(image, true, 8, 4);
194         image = TwistImage(image, false, 0, 0);
195         return 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>
203     public string CreateVerifyCode(int codeLen, int zhCharsCount)
204     {
205         char[] chs = new char[codeLen];
206 
207         int index;
208         for (int i = 0; i < zhCharsCount; i++)
209         {
210             index = rndNumber.Next(0, codeLen);
211             if (chs[index] == '')
212                 chs[index] = CreateZhChar();
213             else
214                 --i;
215         }
216         for (int i = 0; i < codeLen; i++)
217         {
218             if (chs[i] == '')
219                 chs[i] = CreateEnOrNumChar();
220         }
221 
222         return new string(chs, 0, chs.Length);
223     }
224     // 生成默认长度5的随机字符码
225     public string CreateVerifyCode()
226     {
227         return CreateVerifyCode(Length, 0);
228     }
229     // 生成英文或数字字符
230     protected char CreateEnOrNumChar()
231     {
232         return mrEnglishOrNumChars[rndNumber.Next(0, mrEnglishOrNumChars.Length)];
233     }
234     protected 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
237         if (mrChineseChars.Length > 0)
238         {
239             return 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
242         else
243         {
244             byte[] bytes = new byte[2];
245 
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
252             string str1 = Encoding.GetEncoding("gb2312").GetString(bytes);
253 
254             return str1[0];
255         }
256     }
257 }

调用方法验证用户是否输入正确

 VdCode gc = new VdCode();
        string googleCode = gc.CreateVerifyCode(4, 0);//生成汉字，只生成数字的，若有有字母的，修改一下类中的mrEnglishOrNumChars

        Session["VdCode"] = googleCode.ToString();
        System.Drawing.Bitmap bitmap = gc.CreateImage(googleCode);
        System.IO.MemoryStream ms = new System.IO.MemoryStream();
        bitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
        Response.Clear();
        //Response.ContentType = "image/Png";
        Response.BinaryWrite(ms.GetBuffer());
        bitmap.Dispose();
        ms.Dispose();
        ms.Close();
        Response.End();

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原文地址：https://www.cnblogs.com/ithuo/p/4866935.html