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;
using System.Text;
public partial class Admin_ValidCode : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
this.CreateCheckCodeImage(GenerateCheckCode());
}
private string GenerateCheckCode()
{
int number;
//char code;
string checkCode = String.Empty;
System.Random random = new Random();
Encoding gb = Encoding.GetEncoding("gb2312");
//調(diào)用函數(shù)產(chǎn)生4個(gè)隨機(jī)中文漢字編碼
object[] bytes = CreateRegionCode(6);
//根據(jù)漢字編碼的字節(jié)數(shù)組解碼出中文漢字
string str1 = gb.GetString((byte[])Convert.ChangeType(bytes[0], typeof(byte[])));
string str2 = gb.GetString((byte[])Convert.ChangeType(bytes[1], typeof(byte[])));
string str3 = gb.GetString((byte[])Convert.ChangeType(bytes[2], typeof(byte[])));
string str4 = gb.GetString((byte[])Convert.ChangeType(bytes[3], typeof(byte[])));
//輸出的控制臺(tái)
checkCode = str1 + str2 + str3 + str4;
//for (int i = 0; i < 5; 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("ValidCode",LjfLib.Encrypt.AES.EncryptAes(checkCode)));
//Session["ValidCode"] = checkCode;
return checkCode;
}
#region 產(chǎn)生波形濾鏡效果
private static object[] CreateRegionCode(int strlength)
{
//定義一個(gè)字符串?dāng)?shù)組儲(chǔ)存漢字編碼的組成元素
string[] rBase = new String[16] { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
Random rnd = new Random();
//定義一個(gè)object數(shù)組用來
object[] bytes = new object[strlength];
/*每循環(huán)一次產(chǎn)生一個(gè)含兩個(gè)元素的十六進(jìn)制字節(jié)數(shù)組，并將其放入bject數(shù)組中
每個(gè)漢字有四個(gè)區(qū)位碼組成
區(qū)位碼第1位和區(qū)位碼第2位作為字節(jié)數(shù)組第一個(gè)元素
區(qū)位碼第3位和區(qū)位碼第4位作為字節(jié)數(shù)組第二個(gè)元素
*/
for (int i = 0; i < strlength; i++)
{
//區(qū)位碼第1位
int r1 = rnd.Next(11, 14);
string str_r1 = rBase[r1].Trim();
//區(qū)位碼第2位
rnd = new Random(r1 * unchecked((int)DateTime.Now.Ticks) + i);//更換隨機(jī)數(shù)發(fā)生器的
//種子避免產(chǎn)生重復(fù)值
int r2;
if (r1 == 13)
{
r2 = rnd.Next(0, 7);
}
else
{
r2 = rnd.Next(0, 16);
}
string str_r2 = rBase[r2].Trim();
//區(qū)位碼第3位
rnd = new Random(r2 * unchecked((int)DateTime.Now.Ticks) + i);
int r3 = rnd.Next(10, 16);
string str_r3 = rBase[r3].Trim();
//區(qū)位碼第4位
rnd = new Random(r3 * unchecked((int)DateTime.Now.Ticks) + i);
int r4;
if (r3 == 10)
{
r4 = rnd.Next(1, 16);
}
else if (r3 == 15)
{
r4 = rnd.Next(0, 15);
}
else
{
r4 = rnd.Next(0, 16);
}
string str_r4 = rBase[r4].Trim();
//定義兩個(gè)字節(jié)變量存儲(chǔ)產(chǎn)生的隨機(jī)漢字區(qū)位碼
byte byte1 = Convert.ToByte(str_r1 + str_r2, 16);
byte byte2 = Convert.ToByte(str_r3 + str_r4, 16);
//將兩個(gè)字節(jié)變量存儲(chǔ)在字節(jié)數(shù)組中
byte[] str_r = new byte[] { byte1, byte2 };
//將產(chǎn)生的一個(gè)漢字的字節(jié)數(shù)組放入object數(shù)組中
bytes.SetValue(str_r, i);
}
return bytes;
}
private const double PI = 3.1415926535897932384626433832795;
private const double PI2 = 6.283185307179586476925286766559;
private System.Drawing.Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase)
{
System.Drawing.Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height);
// 將位圖背景填充為白色
System.Drawing.Graphics graph = System.Drawing.Graphics.FromImage(destBmp);
graph.FillRectangle(new SolidBrush(System.Drawing.Color.White), 0, 0, destBmp.Width, destBmp.Height);
graph.Dispose();
double dBaseAxisLen = bXDir ? (double)destBmp.Height : (double)destBmp.Width;
for (int i = 0; i < destBmp.Width; i++)
{
for (int j = 0; j < destBmp.Height; j++)
{
double dx = 0;
dx = bXDir ? (PI2 * (double)j) / dBaseAxisLen : (PI2 * (double)i) / dBaseAxisLen;
dx += dPhase;
double dy = Math.Sin(dx);
// 取得當(dāng)前點(diǎn)的顏色
int nOldX = 0, nOldY = 0;
nOldX = bXDir ? i + (int)(dy * dMultValue) : i;
nOldY = bXDir ? j : j + (int)(dy * dMultValue);
System.Drawing.Color color = srcBmp.GetPixel(i, j);
if (nOldX >= 0 && nOldX < destBmp.Width
&& nOldY >= 0 && nOldY < destBmp.Height)
{
destBmp.SetPixel(nOldX, nOldY, color);
}
}
}
return destBmp;
}
#endregion
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 * 27.0)), 25);
Graphics g = Graphics.FromImage(image);
try
{
//生成隨機(jī)生成器
Random random = new Random();
//清空?qǐng)D片背景色
g.Clear(Color.White);
//畫圖片的背景噪音線
for (int i = 0; i < 12; 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.Silver), x1, y1, x2, y2);
}
//Font font = new System.Drawing.Font("Arial", 16, (System.Drawing.FontStyle.Bold System.Drawing.FontStyle.Italic));
Font font = new System.Drawing.Font("楷體_GB2312", 16, (System.Drawing.FontStyle.Bold));
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);
//畫圖片的前景噪音點(diǎn)
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()));
}
//image = TwistImage(image, true, 3, 1);
//畫圖片的波形濾鏡效果
//畫圖片的邊框線
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();
}
}
}