大连做网站海外推广渠道都有哪些

using System;
using System.Drawing;
using System.Text;namespace Wisdom.JPClient.WeiXin.Utility
{public class VerifyCode{// 供验证码生成汉字时选取的汉字集,若为空则按照《GB2312简体中文编码表》编码规则构造汉字private const string ChineseChars = "";// 英文与数字串private const string EnglishOrNumChars = "23456789abcdefghijkmnpqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ";private const double PI = 3.1415926535897932384626433832795;private const double PI2 = 6.283185307179586476925286766559;// 全局随机数生成器private Random rnd;public VerifyCode(){rnd = new Random(unchecked((int)DateTime.Now.Ticks));}/// <summary>/// 生成随机字符码/// </summary>/// <param name="codeLen">字符串长度</param>/// <param name="zhCharsCount">中文字符数</param>/// <returns></returns>public string CreateVerifyCode(int codeLen, int zhCharsCount){char[] chs = new char[codeLen];int index = 0;for (int i = 0; i < zhCharsCount; i++){index = rnd.Next(0, codeLen);if (chs[index] == '\0'){chs[index] = CreateZhChar();}else{--i;}}for (int i = 0; i < codeLen; i++){if (chs[i] == '\0'){chs[i] = CreateEnOrNumChar();}}return new string(chs, 0, chs.Length);}/// <summary>/// 生成随机字符码 默认6位/// </summary>/// <returns></returns>public string CreateVerifyCode(){return CreateVerifyCode(4, 0);}/// <summary>/// 生成校验码图片/// </summary>/// <param name="verifyCode"></param>/// <returns></returns>public Bitmap CreateImage(string verifyCode, int width, int height, int fontSize){if (string.IsNullOrEmpty(verifyCode)){return null;}System.Drawing.Bitmap image = new System.Drawing.Bitmap(width, height);Graphics g = Graphics.FromImage(image);try{//生成随机生成器Random random = new Random();//清空图片背景色g.Clear(Color.White);//画图片的背景噪音线for (int i = 0; i < 25; i++){int x1 = random.Next(image.Width);int x2 = random.Next(image.Width);int y1 = random.Next(image.Height);int y2 = random.Next(image.Height);g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);}Font font = new System.Drawing.Font("Verdana", fontSize, (System.Drawing.FontStyle.Italic));System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);g.DrawString(verifyCode, font, brush, 5, 5);//画图片的前景噪音点for (int i = 0; i < 100; i++){int x = random.Next(image.Width);int y = random.Next(image.Height);image.SetPixel(x, y, Color.FromArgb(random.Next()));}//画图片的边框线g.DrawRectangle(new Pen(Color.White), 0, 0, image.Width - 1, image.Height - 1);}catch{return null;}return image;}/// <summary>/// 生成英文或数字字符/// </summary>/// <returns></returns>public char CreateEnOrNumChar(){return EnglishOrNumChars[rnd.Next(0, EnglishOrNumChars.Length)];}/// <summary>/// 生成汉字字符/// </summary>/// <returns></returns>public char CreateZhChar(){//若提供了汉字集，查询汉字集选取汉字if (ChineseChars.Length > 0){return ChineseChars[rnd.Next(0, ChineseChars.Length)];}//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else{byte[] bytes = new byte[2];//第一个字节值在0xb0, 0xf7之间bytes[0] = (byte)rnd.Next(0xb0, 0xf8);//第二个字节值在0xa1, 0xfe之间bytes[1] = (byte)rnd.Next(0xa1, 0xff);//根据汉字编码的字节数组解码出中文汉字string str1 = Encoding.GetEncoding("gb2312").GetString(bytes);return str1[0];}}/// <summary>/// 正弦曲线Wave扭曲图片（Edit By 51aspx.com）/// </summary>/// <param name="srcBmp">图片路径</param>/// <param name="bXDir">如果扭曲则选择为True</param>/// <param name="nMultValue">波形的幅度倍数，越大扭曲的程度越高，一般为3</param>/// <param name="dPhase">波形的起始相位，取值区间[0-2*PI)</param>/// <returns></returns>public System.Drawing.Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase){System.Drawing.Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height);// 将位图背景填充为白色System.Drawing.Graphics graph = System.Drawing.Graphics.FromImage(destBmp);graph.FillRectangle(new SolidBrush(System.Drawing.Color.White), 0, 0, destBmp.Width, destBmp.Height);graph.Dispose();double dBaseAxisLen = bXDir ? (double)destBmp.Height : (double)destBmp.Width;for (int i = 0; i < destBmp.Width; i++){for (int j = 0; j < destBmp.Height; j++){double dx = 0;dx = bXDir ? (PI2 * (double)j) / dBaseAxisLen : (PI2 * (double)i) / dBaseAxisLen;dx += dPhase;double dy = Math.Sin(dx);// 取得当前点的颜色int nOldX = 0, nOldY = 0;nOldX = bXDir ? i + (int)(dy * dMultValue) : i;nOldY = bXDir ? j : j + (int)(dy * dMultValue);System.Drawing.Color color = srcBmp.GetPixel(i, j);if (nOldX >= 0 && nOldX < destBmp.Width&& nOldY >= 0 && nOldY < destBmp.Height){destBmp.SetPixel(nOldX, nOldY, color);}}}return destBmp;}#region 生成验证码图片/*protected void GenerateVerifyImage(){VerifyCode vc = new VerifyCode();string verifyCode = vc.CreateVerifyCode(4, 0);Response.Clear();System.Drawing.Bitmap img = vc.CreateImage(verifyCode);if (img != null){System.IO.MemoryStream ms = new System.IO.MemoryStream();img.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);Response.ContentType = "image/jpeg";Response.BinaryWrite(ms.GetBuffer());img.Dispose();ms.Close();Response.End();}}*/#endregion#region 产生6位手机验证码/// <summary>/// 产生6位数字手机验证码/// </summary>/// <returns></returns>public string GeneratePhoneVerifyCode(){const int CodeLen = 6;int[] array = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };string Code = string.Empty;int randomNum;Random random = new Random();for (int i = 0; i < CodeLen; i++){randomNum = random.Next(array.Length);Code += array[randomNum];}// return "111111";return Code;}#endregion}
}