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CAPTCHA Image

, 9 Feb 2004
Using CAPTCHA images to prevent automated form submission.
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Imaging;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

namespace CaptchaImage
{
	public class JpegImage : System.Web.UI.Page
	{
		private void Page_Load(object sender, System.EventArgs e)
		{
			// Create a CAPTCHA image using the text stored in the Session object.
			CaptchaImage ci = new CaptchaImage(this.Session["CaptchaImageText"].ToString(), 200, 50, "Century Schoolbook");

			// Change the response headers to output a JPEG image.
			this.Response.Clear();
			this.Response.ContentType = "image/jpeg";

			// Write the image to the response stream in JPEG format.
			ci.Image.Save(this.Response.OutputStream, ImageFormat.Jpeg);

			// Dispose of the CAPTCHA image object.
			ci.Dispose();
		}

		#region Web Form Designer generated code
		override protected void OnInit(EventArgs e)
		{
			//
			// CODEGEN: This call is required by the ASP.NET Web Form Designer.
			//
			InitializeComponent();
			base.OnInit(e);
		}
		
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{    
			this.Load += new System.EventHandler(this.Page_Load);
		}
		#endregion
	}
}

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License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

BrainJar
Web Developer
United States United States
No Biography provided

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Web03 | 2.8.140721.1 | Last Updated 10 Feb 2004
Article Copyright 2004 by BrainJar
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