asp.net彩色汉字验证码
2009-05-15 16:11
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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.IO;
using System.Text;
using System.Drawing;
public partial class ValidateCode : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
this.CreateImage(CreatValidateCode());
}
private string CreatValidateCode()
{
Encoding gb = Encoding.GetEncoding("gb2312");
string[] storecode= new String[16] { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
Random rnd=new Random();
object[] codes=new object[4];
for(int i=0;i<4;i++)
{
int rcode1=rnd.Next(11,14);
string str_rcode1=storecode[rcode1].Trim();
rnd=new Random(rcode1*unchecked((int)DateTime.Now.Ticks)+i);
int rcode2;
if (rcode1==13)
{
rcode2=rnd.Next(0,7);
}
else
{
rcode2=rnd.Next(0,16);
}
string str_rcode2=storecode[rcode2].Trim();
rnd=new Random(rcode2*unchecked((int)DateTime.Now.Ticks)+i);
int rcode3=rnd.Next(10,16);
string str_rcode3=storecode[rcode3].Trim();
rnd=new Random(rcode3*unchecked((int)DateTime.Now.Ticks)+i);
int rcode4;
if (rcode3==10)
{
rcode4=rnd.Next(1,16);
}
else if (rcode3==15)
{
rcode4=rnd.Next(0,15);
}
else
{
rcode4=rnd.Next(0,16);
}
string str_rcode4=storecode[rcode4].Trim();
byte byte1=Convert.ToByte(str_rcode1 + str_rcode2,16);
byte byte2=Convert.ToByte(str_rcode3 + str_rcode4,16);
byte[] storebytes=new byte[]{byte1,byte2};
codes.SetValue(storebytes,i);
}
object[] showbytes = codes;
string strcode1 = gb.GetString((byte[])Convert.ChangeType(showbytes[0], typeof(byte[])));
string strcode2 = gb.GetString((byte[])Convert.ChangeType(showbytes[1], typeof(byte[])));
string strcode3 = gb.GetString((byte[])Convert.ChangeType(showbytes[2], typeof(byte[])));
string strcode4 = gb.GetString((byte[])Convert.ChangeType(showbytes[3], typeof(byte[])));
string checkValidateCode = strcode1 + strcode2 + strcode3 + strcode4;
Response.Cookies.Add(new HttpCookie("ValidateCode", checkValidateCode));
return checkValidateCode;
}
private void CreateImage(string checkValidateCode)
{
if (checkValidateCode == null || checkValidateCode.Trim() == String.Empty)
return;
System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkValidateCode.Length * 45.0)),80);
Graphics g = Graphics.FromImage(image);
try
{
Random random = new Random();
g.Clear(Color.White);
for (int i = 0; i < 150; i++)
{
int x1 = random.Next(image.Width);
int x2 = random.Next(image.Width);
int y1 = random.Next(image.Height);
4000
int y2 = random.Next(image.Height);
g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
}
string[] pickfonts = { "Verdana", "Microsoft Sans Serif", "Comic Sans MS", "Arial", "宋体" };
Color[] pickcolors = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };
for (int i = 0; i < checkValidateCode.Length; i++)
{
int pickindex = random.Next(7);
int fontindex = random.Next(4);
Font font_f = new System.Drawing.Font(pickfonts[fontindex], 30, System.Drawing.FontStyle.Bold);
Brush solid_b = new System.Drawing.SolidBrush(pickcolors[pickindex]);
int j = 30;
if ((i + 1) % 2 == 0)
{
j =2;
}
g.DrawString(checkValidateCode.Substring(i, 1), font_f, solid_b, 3 + (i * 40), j);
}
for (int i = 0; i < 1000; i++)
{
int x = random.Next(image.Width);
int y = random.Next(image.Height);
image.SetPixel(x, y, Color.FromArgb(random.Next()));
}
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.Bmp);
Response.ClearContent();
Response.ContentType = "image/Bmp";
Response.BinaryWrite(ms.ToArray());
}
finally
{
g.Dispose();
image.Dispose();
}
}
}
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