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.Text;
using System.Drawing;
public partial class CnCode : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
//獲取GB2312編碼頁(表)
Encoding gb = Encoding.GetEncoding("gb2312");
//調(diào)用函數(shù)產(chǎn)生4個隨機中文漢字編碼
object[] bytes = CreateRegionCode(4);
//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
CreateImage(str1 + str2 + str3 + str4);
}
/*
此函數(shù)在漢字編碼范圍內(nèi)隨機創(chuàng)建含兩個元素的十六進(jìn)制字節(jié)數(shù)組,每個字節(jié)數(shù)組代表一個漢字,并將
四個字節(jié)數(shù)組存儲在object數(shù)組中。
參數(shù):strlength,代表需要產(chǎn)生的漢字個數(shù)
*/
public static object[] CreateRegionCode(int strlength)
{
//定義一個字符串?dāng)?shù)組儲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object數(shù)組用來
object[] bytes=new object[strlength];
/**//*每循環(huán)一次產(chǎn)生一個含兩個元素的十六進(jìn)制字節(jié)數(shù)組,并將其放入bject數(shù)組中
每個漢字有四個區(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();
//定義兩個字節(jié)變量存儲產(chǎn)生的隨機漢字區(qū)位碼
byte byte1=Convert.ToByte(str_r1 + str_r2,16);
byte byte2=Convert.ToByte(str_r3 + str_r4,16);
//將兩個字節(jié)變量存儲在字節(jié)數(shù)組中
byte[] str_r=new byte[]{byte1,byte2};
//將產(chǎn)生的一個漢字的字節(jié)數(shù)組放入object數(shù)組中
bytes.SetValue(str_r,i);
}
return bytes;
}
private void CreateImage(string checkCode)
{
int iwidth = (int)(checkCode.Length * 25);
System.Drawing.Bitmap image = new System.Drawing.Bitmap(iwidth, 20);
Graphics g = Graphics.FromImage(image);
Font f = new System.Drawing.Font("Arial", 12, System.Drawing.FontStyle.Bold);
Brush b = new System.Drawing.SolidBrush(Color.White);
//g.FillRectangle(new System.Drawing.SolidBrush(Color.Blue),0,0,image.Width, image.Height);
g.Clear(Color.Blue);
g.DrawString(checkCode, f, b, 3, 3);
Pen blackPen = new Pen(Color.Black, 0);
Random rand = new Random();
for (int i = 0; i < 4; i++)
{
int y = rand.Next(image.Height);
g.DrawLine(blackPen, 0, y, image.Width, y);
}
System.IO.MemoryStream ms = new System.IO.MemoryStream();
image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
Response.ClearContent();
Response.ContentType = "image/png";
Response.BinaryWrite(ms.ToArray());
g.Dispose();
image.Dispose();
}
}
該文章轉(zhuǎn)載自'大智の博客':http://www.csafe.cn/article.asp?id=1274
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