Graphics Verification Code

A new. cs file is used to write a method that generates a graphical verification code, returning a MemoryStream parameter. The output will be received in the Default.aspx.

1. The following is the code for. CS

Using system;using system.collections.generic;using system.linq;using system.web;using System.Drawing;using system.drawing.drawing2d;using system.drawing.imaging;using system.io;///<summary>///bitmapimage Summary description/// </summary>public class bitmapimage{public static MemoryStream Imagecheck () {Random random = new Rando        M (); Randomly generates 4-bit random number string checkcode = random. Next (1000, 9999).        ToString ();        Bitmap is used to specify the size of the text at initialization Bitmap image = new Bitmap ((int) math.ceiling ((Checkcode.length * 20.5)), 22);        Graphics g = graphics.fromimage (image); try {g.clear (color.white);//Empty picture background color//Picture background noise line here is 4 lines for (int i = 0; i < 4; 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, x2, y1, y2);            } font font = new Font ("Arial", fontstyle.bold); Set the color, starting position and other parameters LinearGradientBrush brush = new LinearGradientBrush (new Rectangle (0, 0, image. Width, image.            Height), Color.Blue, color.darkred, 1.2f, true);            g.DrawString (Checkcode, Font, brush, 2, 2); Picture the foreground noise point for (int i = 0; i < i++) {int x = random. Next (image.                Width); int y = random. Next (image.                Height); Image. SetPixel (x, Y, Color.FromArgb (random.            Next ())); }//Draw picture Noise line G.drawrectangle (new Pen (Color.silver), 0, 0, image. Width-1, image.            HEIGHT-1);            MemoryStream ms = new MemoryStream (); Image.            Save (MS, Imageformat.gif);        return MS;            } finally {g.dispose (); Image.        Dispose (); }    }}

2. The following is the code in Default.aspx.cs

Using system;using system.collections.generic;using system.linq;using system.web;using System.Web.UI;using System.web.ui.webcontrols;using system.io;public Partial class _default:system.web.ui.page{    protected void Page_ Load (object sender, EventArgs e)    {        MemoryStream ms= bitmapimage.imagecheck ();        Response.clearcontent ();        Response.ContentType = "Image/gif";        Response.BinaryWrite (Ms. ToArray ());}    }

3.

　

Graphics Verification Code