C#生成中文汉字验证码源码(页 1) - ＩＴ世界 - 芜湖论坛

本色发表于 2007-10-3 21:07

C#生成中文汉字验证码源码

using System; -f6]_3P)[g'n~
using System.Data;
using System.Configuration;
using System.Collections; r4M#]s(x%y'\&O-X\
using System.Web; w7I!\3@\
using System.Web.Security; R4j,r$z3Tm
using System.Web.UI;
using System.Web.UI.WebControls; M"l`I |Il6\r!C
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Drawing;
using System.Text; CHDL:hA_#^f

public partial class Admin_ValidCode : System.Web.UI.Page `]CE+`z#`
{
protected void Page_Load(object sender, EventArgs e)
{ ;`SEf'v6RH~2G"\!mP
this.CreateCheckCodeImage(GenerateCheckCode());

} 3eI;?P'p
private string GenerateCheckCode()
{ L$C#Z+z5q{
int number; +cqQ;xB }uE.w?
//char code; a+P4urT,Y
string checkCode = String.Empty; q~m-zV^v
9}3` No]0m.b3HY,{
System.Random random = new Random(); -BF*l&sYt"k2U!U P
#A*@-Acq-uW7K5x
Encoding gb = Encoding.GetEncoding("gb2312");
//调用函数产生4个随机中文汉字编码
object[] bytes = CreateRegionCode(6); !_z"CFT OLD,D+N
//根据汉字编码的字节数组解码出中文汉字 [|$ab&O9u$s
string str1 = gb.GetString((byte[])Convert.ChangeType(bytes[0], typeof(byte[]))); ;^g9K)J%Oi0DN |)B Y hBX
string str2 = gb.GetString((byte[])Convert.ChangeType(bytes[1], typeof(byte[]))); gcXf#hvRX
string str3 = gb.GetString((byte[])Convert.ChangeType(bytes[2], typeof(byte[]))); 6} IG3n'n
string str4 = gb.GetString((byte[])Convert.ChangeType(bytes[3], typeof(byte[]))); -sRU4OB|+N,f
//输出的控制台
checkCode = str1 + str2 + str3 + str4; `o ]S'J&j2YJ`q
e6l,lHST
//for (int i = 0; i < 5; i++) H4L'h$I7Y
//{
// number = random.Next();

// if (number % 2 == 0) 7EE5iIz0?;d9M
// code = (char)('0' + (char)(number % 10)); /aAICQ/\&o
// else ct1]9Xp1T/[
// code = (char)('A' + (char)(number % 26));

// checkCode += code.ToString();
//} +v0qr }Md
3F5CEK'aF"L.`,L
Response.Cookies.Add(new HttpCookie("ValidCode",LjfLib.Encrypt.AES.EncryptAes(checkCode))); #JZ.TXTs
//Session["ValidCode"] = checkCode; ]"mW|'aj2^ p L ]
b$qA&`&{[QA

return checkCode;
} y!A#im*DLzs"bT

#region 产生波形滤镜效果 "Cy8E9l?DE

private static object[] CreateRegionCode(int strlength) 2F'V?C#Z4k(C0o
{
//定义一个字符串数组储存汉字编码的组成元素 R^f h$q!jBF
string[] rBase = new String[16] { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" }; Q[A*C6r8f3dT

Random rnd = new Random();

//定义一个object数组用来 3B*c1]R5P#n
object[] bytes = new object[strlength]; (EE x:O5B1g7o2] N|

/*每循环一次产生一个含两个元素的十六进制字节数组，并将其放入bject数组中 @z:b;b_'e.k@|
每个汉字有四个区位码组成 } K;W]r:]-K_
区位码第1位和区位码第2位作为字节数组第一个元素 e5Ow8]MYg
区位码第3位和区位码第4位作为字节数组第二个元素 .\RW,JIu P
*/ KX_aO7j Y+Dw7}&T
for (int i = 0; i < strlength; i++)
{ 0kLg-z(pyX7L
//区位码第1位 J N7X(I p$hA
int r1 = rnd.Next(11, 14);
string str_r1 = rBase[r1].Trim();
2E*p+n^8^V5c
//区位码第2位
rnd = new Random(r1 * unchecked((int)DateTime.Now.Ticks) + i);//更换随机数发生器的
Khi3dJ2z
//种子避免产生重复值
int r2; h"jA^[*{
if (r1 == 13) (C7\?B+AeJ
{ +SZ&}4|c^7Od$l
r2 = rnd.Next(0, 7); BeD.?S3E
} V5U-SX~oJTa
else 0N\!G]*CU
{ V8S q7tlh ]n
r2 = rnd.Next(0, 16);
} !QIFb[+b S m F(Y
string str_r2 = rBase[r2].Trim(); 0|/J]{u;n,lQ4UX4R
,J+g)Kv#WSY
//区位码第3位 sP6x/{ea*R0dC
rnd = new Random(r2 * unchecked((int)DateTime.Now.Ticks) + i);
int r3 = rnd.Next(10, 16); /Z9xaRC(Y
string str_r3 = rBase[r3].Trim();
)sj2mfK!aW
//区位码第4位
rnd = new Random(r3 * unchecked((int)DateTime.Now.Ticks) + i); |3Xdy(S&V%x`V
int r4; 5vYBc.ZT]5vv&V|
if (r3 == 10) ]'@.[2XfFw)A
{ 8Hr(t2t/P T7@$T
r4 = rnd.Next(1, 16); $Os?${n
} #[/I#i:X3`w+G:q4P
else if (r3 == 15)
{
r4 = rnd.Next(0, 15);
} h)LZ @#L4f9r
else
{ "Z@|:S"v$X[7o
r4 = rnd.Next(0, 16); n6`I?5V*M0g
} E Q!r_ ^"s
string str_r4 = rBase[r4].Trim(); tvr3D{Rx

//定义两个字节变量存储产生的随机汉字区位码
byte byte1 = Convert.ToByte(str_r1 + str_r2, 16); D+L9Z#}4k\%K;c X h
byte byte2 = Convert.ToByte(str_r3 + str_r4, 16);
//将两个字节变量存储在字节数组中 Wm\)}#o H
byte[] str_r = new byte[] { byte1, byte2 };
YAI:dV f }
//将产生的一个汉字的字节数组放入object数组中
bytes.SetValue(str_r, i); 2G*x(ANIk5z
}
return bytes; 'q'R\:G3DI3TS6b B
} /j:fL5\aM&]'|.a
I$S(PVgs3|6E
private const double PI = 3.1415926535897932384626433832795;
private const double PI2 = 6.283185307179586476925286766559;
private System.Drawing.Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase) H!p:DcxX$x~
{
System.Drawing.Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height); j ORl5X} R

// 将位图背景填充为白色 +@ MX SC/ZLJ
System.Drawing.Graphics graph = System.Drawing.Graphics.FromImage(destBmp); Z}d h/Me
graph.FillRectangle(new SolidBrush(System.Drawing.Color.White), 0, 0, destBmp.Width, destBmp.Height); '|"F7KNA} ~
graph.Dispose(); ?-b{D_5Z$\_

double dBaseAxisLen = bXDir ? (double)destBmp.Height : (double)destBmp.Width; q)s9Rf4rp&@4C
\@$\P7KL#^
for (int i = 0; i < destBmp.Width; i++)
{ ]wgl,@f
for (int j = 0; j < destBmp.Height; j++)
{
double dx = 0; .j M8BjSH
dx = bXDir ? (PI2 * (double)j) / dBaseAxisLen : (PI2 * (double)i) / dBaseAxisLen;
dx += dPhase;
double dy = Math.Sin(dx); %SEK~-k9~I
`UC/jI'@
// 取得当前点的颜色
int nOldX = 0, nOldY = 0;
nOldX = bXDir ? i + (int)(dy * dMultValue) : i; *\,|(n-`8rW7]:gX6t
nOldY = bXDir ? j : j + (int)(dy * dMultValue); Wj4zk#i*[

System.Drawing.Color color = srcBmp.GetPixel(i, j); 9D*RtG-Vz_*cq
if (nOldX >= 0 && nOldX < destBmp.Width ^/]y'|yj$z#z
&& nOldY >= 0 && nOldY < destBmp.Height) qoL}1|ud
{
destBmp.SetPixel(nOldX, nOldY, color);
} !mxfSv.Qy{q;q
}
}
{sfZ8k ` @
return destBmp; YE'Lcx(U$l
} S0x:M8]&I
#endregion a+@jDU){i.c

private void CreateCheckCodeImage(string checkCode) "GNU.` t
{ K4zMe1^k_(H*?&_
if (checkCode == null 　　 checkCode.Trim() == String.Empty) _Dd!^'Tv
return; 5n^xb/\W!v
fy@Not
System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 27.0)), 25); cM` W^r}-Q$E
Graphics g = Graphics.FromImage(image); :v nW,_)[^ L%R ^

try Jys;~5p%Q E
{ 7oEi.Z+?"m%m%hr
//生成随机生成器 ltp mt3E
Random random = new Random(); aAAI(x2[{/Xj+U
ci3^S]f
//清空图片背景色 Fnk8JG*R%bM&o
g.Clear(Color.White);

//画图片的背景噪音线
for (int i = 0; i < 12; i++) 5cm H@v$hU
{
int x1 = random.Next(image.Width);
int x2 = random.Next(image.Width);
int y1 = random.Next(image.Height);
int y2 = random.Next(image.Height);
iXoq(GT Cfy!b
g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2); Lw#KzK|
}

//Font font = new System.Drawing.Font("Arial", 16, (System.Drawing.FontStyle.Bold 　 System.Drawing.FontStyle.Italic));
Font font = new System.Drawing.Font("楷体_GB2312", 16, (System.Drawing.FontStyle.Bold)); -jq_:~l
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); D^+G9{CX5P
g.DrawString(checkCode, font, brush, 2, 2); `.r!`P}o
BDb#tf'H
//画图片的前景噪音点
for (int i = 0; i < 100; i++)
{
int x = random.Next(image.Width); !I8~%C9r%W$r[!k
int y = random.Next(image.Height);
+Z-?agb!^rx3OH3p
image.SetPixel(x, y, Color.FromArgb(random.Next())); Pv%^ B"dTK&L
}

//image = TwistImage(image, true, 3, 1); sY.Z7[ M&JB@X
//画图片的波形滤镜效果
//画图片的边框线 ~z5U!o0b-e7_(W
g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1); X|(k4C-\D.av BF

System.IO.MemoryStream ms = new System.IO.MemoryStream(); #p}rTfCU
image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif); 0{;`(@aA \"A-Bz8tkwK
Response.ClearContent(); f,al!at
Response.ContentType = "image/Gif"; |e ]VC e#G&J;lA
Response.BinaryWrite(ms.ToArray()); EUp0{~"u
} 7v-x7Wt_r8Im
finally 7n-ZAjC W8G9T
{
g.Dispose(); y g?sP']"Wq6E
image.Dispose(); e(Sl\B
}
nKfl&X+X5A/^
} `#We2s%N
}

页: [1]

芜湖论坛's Archiver

C#生成中文汉字验证码源码