/**********************Created by Chen**************************
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*******************************************************************/using System;using System.Drawing;using System.Drawing.Imaging;using System.Web.UI;using System.Drawing.Drawing2D;using System.IO;namespace Validate{ ///
/// 生成验证码的类 /// public class ValidateNumber { public ValidateNumber() { } ///
/// 验证码的最大长度 /// public int MaxLength { get{return 10;} } ///
/// 验证码的最小长度 /// public int MinLength { get{return 1;} } ///
/// 生成验证码 /// ///
指定验证码的长度
///
public string CreateValidateNumber(int length) { int[] randMembers=new int[length]; int[] validateNums=new int[length]; string validateNumberStr=""; //生成起始序列值 int seekSeek=unchecked((int)DateTime.Now.Ticks); Random seekRand=new Random(seekSeek); int beginSeek=(int)seekRand.Next(0,Int32.MaxValue-length*10000); int[] seeks=new int[length]; for(int i=0;i
/// 创建验证码的图片 /// ///
要输出到的page对象
///
验证码
public void CreateValidateGraphic(Page containsPage,string validateNum) { Bitmap image=new Bitmap((int)Math.Ceiling(validateNum.Length*12.5),22); 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); //画图片的干扰线 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 Font("Arial",12,(FontStyle.Bold|FontStyle.Italic)); LinearGradientBrush brush=new LinearGradientBrush(new Rectangle(0,0,image.Width,image.Height), Color.Blue,Color.DarkRed,1.2f,true); g.DrawString(validateNum,font,brush,3,2); //画图片的前景干扰点 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.Silver),0,0,image.Width-1,image.Height-1); //保存图片数据 MemoryStream stream=new MemoryStream(); image.Save(stream,ImageFormat.Jpeg); //输出图片 containsPage.Response.Clear(); containsPage.Response.ContentType="image/jpeg"; containsPage.Response.BinaryWrite(stream.ToArray()); } finally { g.Dispose(); image.Dispose(); } } /// /// 得到验证码图片的长度 /// ///
验证码的长度
/// public static int GetImageWidth(int validateNumLength) { return (int)(validateNumLength*12.5); } /// /// 得到验证码的高度 /// /// public static double GetImageHeight() { return 22.5; } }}
