CheckCode.aspx.cs
资源名称:yjal.rar [点击查看]
上传用户:shjujing
上传日期:2022-07-28
资源大小:11244k
文件大小:3k
源码类别:
Email客户端
开发平台:
Visual C++
- using System;
- using System.Data;
- using System.Configuration;
- using System.Collections;
- using System.Web;
- using System.Web.Security;
- using System.Web.UI;
- using System.Web.UI.WebControls;
- using System.Web.UI.WebControls.WebParts;
- using System.Web.UI.HtmlControls;
- using System.Drawing;
- public partial class CheckCode : System.Web.UI.Page
- {
- protected void Page_Load(object sender, EventArgs e)
- {
- CreateCheckCodeImage(GenerateCheckCode());
- }
- private string GenerateCheckCode()
- {
- int number;
- char code;
- string checkCode = String.Empty;
- System.Random random = new Random();
- for (int i = 0; i < 4; i++)
- {
- number = random.Next();
- if (number % 2 == 0)
- code = (char)('0' + (char)(number % 10));
- else
- code = (char)('A' + (char)(number % 26));
- checkCode += code.ToString();
- }
- Response.Cookies.Add(new HttpCookie("CheckCode", checkCode));
- return checkCode;
- }
- private void CreateCheckCodeImage(string checkCode)
- {
- if (checkCode == null || checkCode.Trim() == String.Empty)
- return;
- System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.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);
- //画图片的背景噪音线
- for (int i = 0; i < 2; 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.Black), x1, y1, x2, y2);
- }
- Font font = new System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic));
- System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);
- g.DrawString(checkCode, font, brush, 2, 2);
- //画图片的前景噪音点
- 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);
- System.IO.MemoryStream ms = new System.IO.MemoryStream();
- image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
- Response.ClearContent();
- Response.ContentType = "image/Gif";
- Response.BinaryWrite(ms.ToArray());
- }
- finally
- {
- g.Dispose();
- image.Dispose();
- }
- }
- }