GDI+图形验证码
一般外理程序中
using System;
using System.Collections;
using System.Data;
using System.Web;
using System.Web.Services;
//Session
using System.Web.SessionState;
using System.Web.Services.Protocols;
using System.IO;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
namespace GDI
{
/// <summary>
/// $codebehindclassname$ 的摘要说明
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
public class GDI_Handler : IHttpHandler,IRequiresSessionState//Session
{
string _str_code = "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";
int _int_length = 4;
public void ProcessRequest(HttpContext context)
{
string str = code_view();
//Session["code"] = str;
context.Session["code"] = str;
GDI_Method(context, str);
}
private string code_view()
{
string return_str = "";
string[] str_arr = _str_code.Split(new char[] { ',' });
Random r = new Random(unchecked((int)DateTime.Now.Ticks));
int int_start = -1;
for (int i = 0; i < _int_length; i++)
{
int_start = r.Next(0, str_arr.Length - 1);
return_str += str_arr[int_start];
}
return return_str;
}
private static void GDI_Method(HttpContext context, string str)
{
Bitmap imgtime = new Bitmap(50, 25);
Graphics g = Graphics.FromImage(imgtime);
SolidBrush colorpen = new SolidBrush(Color.White);
g.FillRectangle(colorpen, 0, 0, 50, 25);
Array objA = Enum.GetValues(typeof(HatchStyle));
int valuestyle = new Random().Next(objA.Length);
HatchStyle brushstyle = (HatchStyle)objA.GetValue(valuestyle);
HatchBrush thebrush = new HatchBrush(brushstyle, Color.White, Color.Black);
g.DrawString(str, new Font("ArialBlack", 14), thebrush, 0, 0);
MemoryStream ms = new MemoryStream();
imgtime.Save(ms, System.Drawing.Imaging.ImageFormat.Bmp);
byte[] buffer = new byte[ms.Length];
ms.Seek(0, SeekOrigin.Begin);
ms.Read(buffer, 0, (int)ms.Length);
ms.Close();
context.Response.OutputStream.Write(buffer, 0, buffer.Length);
context.Response.OutputStream.Close();
buffer = null;
imgtime.Dispose();
g.Dispose();
}
public bool IsReusable
{
get
{
return false;
}
}
}
}
在页面中添加一个img 标记,src就是该项般外理程序的文件名.