verifycode.cs

登录窗体的验证

using System;
using System.Web;
using System.IO;
using System.Drawing;

namespace Chris.J
{
	/// <summary>
	/// 彩色随机验证码生成类
	/// Code By Chris.J(黄嘉隆)
	/// </summary>
	public class VerifyCode
	{

		// Properties

		#region 验证码长度(默认4个验证码的长度)
		int length = 4;
		public int Length
		{
			get{ return length; }
			set{ length = value; }
		}
		#endregion

		#region 验证码字体大小(默认12像素)
		int fontSize = 12;
		public int FontSize
		{
			get{ return fontSize; }
			set{ fontSize = value; }
		}
		#endregion

		#region 边框补(默认2像素)
		int padding = 2;
		public int Padding
		{
			get{ return padding; }
			set{ padding = value; }
		}
		#endregion

		#region 是否输出燥点(默认不输出)
		bool chaos = false;
		public bool Chaos
		{
			get{ return chaos; }
			set{ chaos = value; }
		}
		#endregion

		#region 输出燥点的颜色(默认灰色)
		Color chaosColor = Color.LightGray;
		public Color ChaosColor
		{
			get{ return chaosColor; }
			set{ chaosColor = value; }
		}
		#endregion

		#region 自定义背景色(默认白色)
		Color backgroundColor = Color.White;
		public Color BackgroundColor
		{
			get{ return backgroundColor; }
			set{ backgroundColor = value; }
		}
		#endregion

		#region 自定义随机颜色数组
		Color[] colors = {Color.Black,Color.Red,Color.DarkBlue,Color.Green,Color.Orange,Color.Brown,Color.DarkCyan,Color.Purple};
		public Color[] Colors
		{
			get{ return colors; }
			set{ colors = value; }
		}
		#endregion

		#region 自定义字体数组
		string[] fonts = {"Arial", "Georgia"};
		public string[] Fonts
		{
			get{ return fonts; }
			set{ fonts = value; }
		}
		#endregion

		#region 自定义随机码字符串序列(使用逗号分隔)
		string codeSerial = "0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z";
		public string CodeSerial
		{
			get{ return codeSerial; }
			set{ codeSerial = value; }
		}
		#endregion

		// Methods

		#region 生成校验码图片
		/// <summary>
		/// 生成校验码图片
		/// </summary>
		/// <param name="code">已经生成的随机码</param>
		/// <returns>位图</returns>
		public Bitmap CreateImageCode(string code)
		{
			int fSize	= FontSize;
			int fWidth  = fSize + Padding;

			int imageWidth		= (int)(code.Length * fWidth) + 4 + Padding * 2;
			int imageHeight		= fSize *2 + Padding;

			System.Drawing.Bitmap image = new System.Drawing.Bitmap(imageWidth, imageHeight);

			Graphics g = Graphics.FromImage(image);

			g.Clear(BackgroundColor);

			Random rand = new Random();

			//给背景添加随机生成的燥点
			if(this.Chaos)
			{

				Pen pen = new Pen(ChaosColor, 0);
				int c = Length * 10;

				for(int i=0;i<c;i++)
				{
					int x = rand.Next(image.Width);
					int y = rand.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 = rand.Next(Colors.Length - 1);
				findex = rand.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
			g.DrawRectangle(new Pen(Color.Black,0), 0, 0, image.Width-1, image.Height-1);

			g.Dispose();

			return image;
		}
		#endregion

		#region 将创建好的图片输出到页面
		/// <summary>
		/// 将创建好的图片输出到页面
		/// </summary>
		/// <param name="code">已经生成的随机码</param>
		/// <param name="context">Web上下文</param>
		public void CreateImageOnPage(string code, HttpContext context)
		{
			System.IO.MemoryStream ms = new System.IO.MemoryStream();
			Bitmap image = this.CreateImageCode(code);

			image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);

			context.Response.ClearContent();
			context.Response.ContentType = "image/Jpeg";
			context.Response.BinaryWrite(ms.GetBuffer());

			ms.Close();
			ms = null;
			image.Dispose();
			image = null;
		}
		#endregion

		#region 生成随机字符码
		/// <summary>
		/// 生成随机字符码
		/// </summary>
		/// <param name="codeLen">随机码长度</param>
		/// <returns>产生的随机码</returns>
		public string CreateVerifyCode(int codeLen)
		{
			if(codeLen == 0)
			{
				codeLen = Length;
			}

			string[] arr = CodeSerial.Split(',');

			string code = "";

			int randValue = -1;

			Random rand = new Random(unchecked((int)DateTime.Now.Ticks));

			for(int i=0; i<codeLen; i++)
			{
				randValue = rand.Next(0, arr.Length -1);

				code += arr[randValue];
			}

			return code;
		}
		public string CreateVerifyCode()
		{
			return CreateVerifyCode(0);
		}
		#endregion

	}
}