if (!string.IsNullOrEmpty(this._font))
{ this._ImgBuilder.Fonts = new string[] { this._font }; } this._ImgBuilderNew.ChaosWight = 40; this._ImgBuilderNew.FontSize = 25;this._ImgBuilderNew.Padding = 3;
System.Drawing.Bitmap image = this._ImgBuilderNew.CreateImage(mCheckNo); System.IO.MemoryStream ms = new System.IO.MemoryStream(); image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg); context.Response.ClearContent(); context.Response.ContentType = "image/Jpeg"; context.Response.BinaryWrite(ms.ToArray()); context.Session["CheckCode"] = mCheckNo.ToString(); //如果没有实现IRequiresSessionState,则这里会出错,也无法生成图片 context.Response.End(); }//验证码生成
protected string DisCheckNo() { string hash = HashCode.GetNext(); string CheckNo = string.Empty; Random rd = new Random(DateTime.Now.Millisecond); for (int i = 0; i < 6; i++) { CheckNo += hash.Substring(rd.Next(1, hash.Length - 1), 1); } CheckNo = CheckNo.Replace("0", rd.Next(1, 9).ToString()); CheckNo = CheckNo.Replace("o", rd.Next(1, 9).ToString()); CheckNo = CheckNo.Replace("O", rd.Next(1, 9).ToString()); return CheckNo; }public bool IsReusable
{ get { return false; } } }2. [代码]调用的类 using System;using System.Drawing;using System.Text;/// <summary>
/// VryImgGen 的摘要说明/// </summary>public class VryImgGen{ public static string ChineseChars = String.Empty;/// <summary>
/// 英文与数字串 /// </summary> protected static readonly string EnglishOrNumChars = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";public VryImgGen()
{ rnd = new Random(unchecked((int)DateTime.Now.Ticks)); }/// <summary>
/// 全局随机数生成器 /// </summary> private Random rnd;int length = 5;
/// <summary> /// 验证码长度(默认6个验证码的长度) /// </summary> public int Length { get { return length; } set { length = value; } }int fontSize = 20;
/// <summary> /// 验证码字体大小(为了显示扭曲效果,默认30像素,可以自行修改) /// </summary> public int FontSize { get { return fontSize; } set { fontSize = value; } }int padding = 4;
/// <summary> /// 边框补(默认4像素) /// </summary> public int Padding { get { return padding; } set { padding = value; } }bool chaos = true;
/// <summary> /// 是否输出燥点(默认输出) /// </summary> public bool Chaos { get { return chaos; } set { chaos = value; } }Color chaosColor = Color.LightGray;
/// <summary> /// 输出燥点的颜色(默认灰色) /// </summary> public Color ChaosColor { get { return chaosColor; } set { chaosColor = value; } }int chaosWight = 1;
/// <summary> /// 输出燥点的浓度 /// </summary> public int ChaosWight { get { return chaosWight; } set { chaosWight = value; } }Color backgroundColor = Color.White;
/// <summary> /// 自定义背景色(默认白色) /// </summary> public Color BackgroundColor { get { return backgroundColor; } set { backgroundColor = value; } }Color[] colors = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };
/// <summary> /// 自定义随机颜色数组 /// </summary> public Color[] Colors { get { return colors; } set { colors = value; } }string[] fonts = { "Arial", "Georgia" };
/// <summary> /// 自定义字体数组 /// </summary> public string[] Fonts { get { return fonts; } set { fonts = value; } }#region 产生波形滤镜效果
private const double PI = 3.1415926535897932384626433832795;
private const double PI2 = 6.283185307179586476925286766559;/// <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;
}
#endregion
/// <summary>
/// 生成校验码图片 /// </summary> /// <param name="code">验证码</param> /// <returns></returns> public Bitmap CreateImage(string code) { int fSize = FontSize; int fWidth = fSize + Padding;int imageWidth = (int)(code.Length * fWidth) + 4 + Padding * 2;
int imageHeight = fSize * 2 + Padding * 2;System.Drawing.Bitmap image = new System.Drawing.Bitmap(imageWidth - 10, imageHeight - 10);
Graphics g = Graphics.FromImage(image);
g.Clear(BackgroundColor);
//给背景添加随机生成的燥点
if (this.Chaos) {Pen pen = new Pen(ChaosColor, 0);
int c = ChaosWight * 10;for (int i = 0; i < c; i++)
{ int x = rnd.Next(image.Width); int y = rnd.Next(image.Height);g.DrawRectangle(pen, x, y, 1, 1);
} }int left = 0, top = 0, top1 = 1, top2 = 1;
int n1 = (imageHeight - FontSize - Padding * 2);
int n2 = n1 / 4; top1 = n2; top2 = n2 * 2;Font f;
Brush b;int cindex, findex;
//随机字体和颜色的验证码字符
for (int i = 0; i < code.Length; i++) { cindex = rnd.Next(Colors.Length - 1); findex = rnd.Next(Fonts.Length - 1);f = new System.Drawing.Font(Fonts[findex], fSize, System.Drawing.FontStyle.Bold);
b = new System.Drawing.SolidBrush(Colors[cindex]);if (i % 2 == 1)
{ top = top2; } else { top = top1; }left = i * fWidth;
g.DrawString(code.Substring(i, 1), f, b, left, top);
}//画一个边框 边框颜色为Color.Gainsboro
g.DrawRectangle(new Pen(Color.Gainsboro, 0), 0, 0, image.Width - 1, image.Height - 1); g.Dispose();//产生波形(Add By 51aspx.com)
image = TwistImage(image, true, 8, 4);return image;
}/// <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;
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>
/// 生成默认长度5的随机字符码 /// </summary> /// <returns></returns> public string CreateVerifyCode() { return CreateVerifyCode(Length, 0); }/// <summary>
/// 生成英文或数字字符 /// </summary> /// <returns></returns> protected char CreateEnOrNumChar() { return EnglishOrNumChars[rnd.Next(0, EnglishOrNumChars.Length)]; }/// <summary>
/// 生成汉字字符 /// </summary> /// <returns></returns> protected 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];
} }}