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代码如下：
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Drawing;
using System.Web.UI.WebControls;
using System.Web.SessionState;
namespace WebServiceClient2
{
??? /// <summary>
??? /// $codebehindclassname$ 的摘要说明
??? /// </summary>
??? [WebService(Namespace = "http://tempuri.org/")]
??? [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
??? public class CreatImageCode : IHttpHandler,IRequiresSessionState
??? {
??????? System.IO.MemoryStream ms = new System.IO.MemoryStream();
??????? public void ProcessRequest(HttpContext context)
??????? {
??????????? string checkCode = CreateCode(4);
??????????? context.Session.Add("checkCode",(object)checkCode);
??????????? CreateImage(checkCode);
??????????? context.Response.ClearContent();
??????????? context.Response.ContentType = "image/Gif";
??????????? context.Response.BinaryWrite(ms.ToArray());
???????????
??????? }
??????? public string CreateCode(int codeLength)
??????? {
??????????? string so = "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";
??????????? string[] strArr = so.Split(',');
??????????? string code = "";
??????????? Random rand = new Random();
??????????? for (int i = 0; i < codeLength; i++)
??????????? {
??????????????? code += strArr[rand.Next(0,strArr.Length)];
??????????? }
??????????? return code;
??????? }
??????? /*产生验证图片*/
??????? public void CreateImage(string code)
??????? {
??????????? Bitmap image = new Bitmap(60,20);
??????????? Graphics g = Graphics.FromImage(image);
??????????? WebColorConverter ww = new WebColorConverter();
??????????? g.Clear((Color)ww.ConvertFromString("#FAE264"));
??????????? Random random = new Random();
??????????? //画图片的背景噪音线
??????????? for (int i = 0; i < 12; 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.LightGray),x1,y1,x2,y2);
??????????? }
??????????? Font font = new Font("Arial",15,FontStyle.Bold | FontStyle.Italic);
??????????? System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(
??????????????? new Rectangle(0,image.Width,image.Height),Color.Blue,Color.Gray,1.2f,true);
??????????? g.DrawString(code,font,brush,0);
??????????? //画图片的前景噪音点
??????????? //for (int i = 0; i < 10; i++)
??????????? //{
??????????? //??? int x = random.Next(image.Width);
??????????? //??? int y = random.Next(image.Height);
??????????? //??? image.SetPixel(x,Color.White);
??????????? //}
??????????? //画图片的边框线
??????????? // g.DrawRectangle(new Pen(Color.Silver),image.Width - 1,image.Height - 1);
??????????? image.Save(ms,System.Drawing.Imaging.ImageFormat.Gif);
??????????? g.Dispose();
??????????? image.Dispose();
??????? }
??????? public bool IsReusable
??????? {
??????????? get
??????????? {
??????????????? return false;
??????????? }
??????? }
??? }
}
在使用的时候只需要添加src即可，如下：
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<img alt="" src="CreatImageCode.ashx" onclick="this.src='CreatImageCode.ashx?dd='+newGuid()" />//用ashx来产生验证码，这个用伪GUID来传参改变值
? <img alt="" src="ImageCode.aspx" onclick="this.src='CreatImageCode.ashx?dd='+new Date()" />//可以直接使用aspx页面，这个用时间传参来请求变换值
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这个上面用到了一个伪GUID?? 方式如下：
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<script type="text/javascript">
??????? function newGuid() { ??????????? var guid = ""; ??????????? for (var i = 1; i <= 32; i++) { ??????????????? var n = Math.floor(Math.random() * 16.0).toString(16); ??????????????? guid += n; ??????????????? if ((i == 8) || (i == 12) || (i == 16) || (i == 20)) ??????????????????? guid += "-"; ??????????? } ??????????? return guid; ??????? } ??? </script>
接下来再去研究一下socket...
