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Foreground reference. aspx:
<%@ page language= "C #" autoeventwireup= "true" codefile= "YanZhengCode.aspx.cs" inherits= "Yanzhengcode"%>
<! DOCTYPE html>
<meta http-equiv= "Content-type" content= "text/html; Charset=utf-8 "/>
<title></title>
<body>
<form id= "Form1" runat= "Server" >
<div>
<script language= "javascript" type= "Text/javascript" >
function Suiji () {
document.getElementById ("Image1"). src = "gif_zl.aspx?chen=" + number;
}
</script>
</div>
</form>
</body>
YanZhengCode.cs
C # code
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;
Using System.IO;
Using System;
public partial class YanZhengCode:System.Web.UI.Page
{
protected void Page_Load (object sender, EventArgs e)
{
String str = request["Chen"];
Buildcode ();
Shuimg ();
}
private void Buildcode ()
{
Color[] Strcolor = {color.red, Color.Blue, Color.brown, Color.Black, Color.tomato};
String[] Strfont = {"XXFarEastFont-Arial"};
Random rands = new Random ();
Bitmap images = new Bitmap (80, 26); Picture size
Graphics g = graphics.fromimage (images);
Font f = new font (strfont[0], 20); Font size
Brush Fill Color
Brush B = new SolidBrush (Color.tomato);
Brush b2 = new SolidBrush (strcolor[rands. Next (0, Strcolor. Length)]);
Brush B3 = new SolidBrush (color.red);
Brush b4 = new SolidBrush (Color.FromArgb (Color.green));
G.clear (color.wheat);
//Line Color
Pen p = new Pen (color.red, 0);
Pen P2 = new Pen (color.turquoise, 0);
Random rand = new Random ();
for (int i = 0; i < i++)
{
int y = rand. Next (images. Height);
int x = rand. Next (images. Width);
//g.drawline (p, 0, y, images). Width, y);
G.drawrectangle (p2, x, y, 1, 1);
}
//int degree = 5;
//point temppoint = new Point ();
//degree = ~degree + 1;
//g.rotatetransform (degree);
//temppoint.x = 20;
//temppoint.y = 4;
G.drawrectangle (p, 0, 0, images. Width-1, images. HEIGHT-1); Drawing area
String strcode = Rand. Next (1000, 10000). ToString ();
session["Yanzhencode"] = Strcode;
g.DrawString (strcode.substring (0, 1), F, B, 2,-1);
g.DrawString (strcode.substring (1, 1), F, B2, 19,-1);
g.DrawString (strcode.substring (2, 1), F, B3, 37,-1);
g.DrawString (Strcode.substring (3, 1), F, B4, 50,-1);
System.IO.MemoryStream ms = new System.IO.MemoryStream ();
Images. Save (MS, System.Drawing.Imaging.ImageFormat.Jpeg);
Response.clearcontent ();
Response.ContentType = "Image/jpeg";
Response.BinaryWrite (Ms. ToArray ());
//response.cookies.add (New HttpCookie ("Chne", "6780"));
G.dispose ();
Images. Dispose ();
}
private void Shuimg ()
{
Response.ContentType = "image/*"; Set the send header as image data
Response.Clear (); Empty Send data
Random rand = new Random ();
Stream stream = OpenFile (Server.MapPath ("pic/" + Rand. Next (1, 6). ToString () + ". jpg"); Open File stream
Bitmap bit = new Bitmap (stream);
Bit. Save (Response.outputstream, System.Drawing.Imaging.ImageFormat.Jpeg);//saved to the output stream
Stream. Close ();
Bit. Dispose ();
Response.Flush (); Output to Client
}
}
Two *******************
Using System; Using System.IO; Using System.Drawing; Using System.Drawing.Imaging; Using System.Text; Using System.Collections; Using System.Web; Using System.Web.UI; Using System.Web.UI.WebControls; Using System.Web.UI.WebControls.WebParts; Using System.Web.UI.HtmlControls; /**////<summary>///* * * ASP (C #) Generate Verification Code *//////File:GenerateCheckCode.aspx.cs////Author: Zhou Zhenxing (Zxjay)/////E-mail: [email protected]////DATE:07-04-10////</summary> Public Partial class GenerateCheckCode:System.Web.UI.Page ... {protected void Page_Load (object sender, EventArgs e) ... {string Chkcode = string. Empty; Color list, for captcha, noise, noise color[] color = ... {color.black, color.red, Color.Blue, Color.green, Color.orange, Color.brown, Color.brown, Color.DarkBlue}; Font list, for captcha string[] Font = ... {"Times New Roman", "MS Mincho", "Book Antiqua", "Gungsuh", "PMingLiU", "Impact"}; The character set of the captcha, stripped of some easily confusing characters char[] character =... {' 2 ', ' 3 ', ' 4 ', ' 5 ', ' 6 ', ' 8 ', ' 9 ', ' A ', ' B ', ' C ', ' D ', ' E ', ' F ', ' G ', ' H ', ' J ', ' K ', ' L ', ' M ', ' N ', ' P ', ' R ', ' S ', ' T ', ' W ', ' X ', ' Y '}; Random rnd = new Random (); Generate a CAPTCHA string for (int i = 0; i < 4; i++) ... {Chkcode + = Character[rnd. Next (character. Length)]; } Bitmap BMP = new Bitmap (100, 40); Graphics g = graphics.fromimage (BMP); G.clear (Color.White); Draw noise line for (int i = 0; i < i++) ... {int x1 = rnd. Next (100); int y1 = rnd. Next (40); int x2 = rnd. Next (100); int y2 = rnd. Next (40); Color clr = color[rnd. Next (color. Length)]; G.drawline (new Pen (CLR), x1, y1, x2, y2); }//Draw verification code string for (int i = 0; i < chkcode.length; i++) ... {String fnt = Font[rnd. Next (font. Length)]; Font ft = new Font (FNT, 18); Color clr = color[rnd. Next (color. Length)]; g.DrawString (Chkcode[i]. ToString (), FT, new SolidBrush (CLR), (float) I * 8, (float) 8); }//Draw noise for (int i = 0; i < i++) ... {int x = rnd. Next (BMP. Width); int y = rnd. Next (BMP. Height); Color clr = color[rnd. Next (color. Length)]; Bmp. SetPixel (x, Y, CLR); }//clear the page output cache, set the page without caching Response.Buffer = true; Response.ExpiresAbsolute = System.DateTime.Now.AddMilliseconds (0); Response.Expires = 0; Response.CacheControl = "No-cache"; Response.appendheader ("Pragma", "No-cache"); Writes the CAPTCHA picture to the memory stream and outputs it in "image/png" format MemoryStream ms = new MemoryStream (); Try ... {BMP. Save (MS, Imageformat.png); Response.clearcontent (); Response.ContentType = "Image/png"; Response.BinaryWrite (Ms. ToArray ()); } finally ... {//Explicitly release resource BMP. Dispose (); G.dispose (); } } }
Here's how to use it:
Create a new file named Generatecheckcode.aspx and copy the above code to the code file GenerateCheckCode.aspx.cs
Place the statement <asp:image id= "IMG1" runat= "Server" imageurl= "~/generatecheckcode.aspx"/> Where a verification code is required.
Web Verification Code
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