简单实用方法！！

简单验证码生成！！

protected void Page_Load(object sender, EventArgs e)

{

string CharList = "0123456789";

int[] size = { 10, 12, 14 };

string[] fm = { "宋体", "楷体_GB2312", "黑体" };

int lastSize = 0;

DateTime dt = System.DateTime.Now;

Random rand = new Random();

int x = rand.Next(10000, 100000);

string src = x.ToString();

Bitmap bmp = new Bitmap(100, 20);

Graphics g = Graphics.FromImage(bmp);

g.FillRectangle(Brushes.White, 0, 0, 100, 20);

Color lastcolor = Color.Blue;

bool info = false;

for (int i = 0; i < 5; i++)

{

char ch=CharList[Convert.ToInt32(src[i].ToString())];

string temp = "";

temp += ch;

int sz = size[rand.Next(0, 3)];

if (i == 3 && !info) //总共5字,到了第4个还没的重叠的话那第四个要设成14号字

//保证重叠发生

sz = 14;

int cr = rand.Next(0, 200);

int cg = rand.Next(0, 200);

int cb = rand.Next(0, 200);

Color c = Color.FromArgb(cr, cg, cb);

int sub = 0;

if (lastSize == 14)

{//如果上一个字是14号,那么下一字向左入侵保证重叠

//对大字号重叠的可视性要比小字号强.

//重叠时最好将当前字符的颜色设为上一字符颜色

c = lastcolor;

info = true;

sub = 8;

}

this.lblMessage.Text+=ch.ToString();

g.DrawString(ch.ToString(),

new Font(new FontFamily(fm[rand.Next(0, fm.Length)]), sz),

new SolidBrush(c),

new Point(i * 20 - sub, 0));

//这里因为字号不同,间隔也不同,但每个字的起始点相同,可以修改根据上一个字

//的大小再调整起始点.

lastSize = sz;

lastcolor = c;

Response.Cookies.Add(new HttpCookie("code", this.lblMessage.Text.ToString()));

}

this.lblMessage.Text = "";

bmp.Save("d:/aaa.gif");

this.Image1.ImageUrl = "d:/aaa.gif";

}

protected void Button1_Click(object sender, EventArgs e)

{

if (Request.Cookies["code"] == null)

{

this.Label1.Text = "您的浏览器设置已被禁用 Cookies，您必须设置浏览器允许使用 Cookies 选项后才能使用本系统。";

return;

}

if (Request.Cookies["code"].Value.ToString().Trim()==this.TextBox1.Text.Trim())

{

Label1.Text = "验证码正确！！";

Response.Cookies["code"].Value =null;

}

else

Label1.Text = "验证码错误，请输入正确的验证码。当前的验证码为" + Request.Cookies["code"].Value.ToString().Trim();

return;

}

验证码原理：

在生成验证码图片的时候，同时生成了一个Session，其值就是验证码图片中的数字值。

同时，提供输入框让用户输入，提交输入值后，与已有的Session值进行比较，根据判断结果做相应判断。

随机生成中文汉字的基本原理！！

static void Main(string[] args)

{

Encoding gb = Encoding.GetEncoding("gb2312");

//调用函数产生4个随机中文汉字编码

object[] bytes = CreateRegionCode(4);

//根据汉字编码的字节数组解码出中文汉字

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[])));

//输出的控制台

Console.WriteLine(str1 + str2 + str3 + str4);

Thread.Sleep(3000);

}

public static object[] CreateRegionCode(int strlength)

{

//定义一个字符串数组储存汉字编码的组成元素

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();

//定义一个object数组用来

object[] bytes=new object[strlength];

/**//*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

每个汉字有四个区位码组成

区位码第1位和区位码第2位作为字节数组第一个元素

区位码第3位和区位码第4位作为字节数组第二个元素

*/

for(int i=0;i<strlength;i++)

{

//区位码第1位

int r1=rnd.Next(11,14);

string str_r1=rBase[r1].Trim();

//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种子避免产生重复值

int r2;

if (r1==13)

{

r2=rnd.Next(0,7);

}

else

{

r2=rnd.Next(0,16);

}

string str_r2=rBase[r2].Trim();

//区位码第3位

rnd=new Random(r2*unchecked((int)DateTime.Now.Ticks)+i);

int r3=rnd.Next(10,16);

string str_r3=rBase[r3].Trim();

//区位码第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);

byte byte2=Convert.ToByte(str_r3 + str_r4,16);

//将两个字节变量存储在字节数组中

byte[] str_r=new byte[]{byte1,byte2};

//将产生的一个汉字的字节数组放入object数组中

bytes.SetValue(str_r,i);

}

return bytes;

}

#region 从excel中导入数据到ds

private DataSet BindDsFromExcel(string strFileDir)

{

string strConn;

strConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source="+strFileDir+";Extended Properties='Excel 8.0;HDR=False;IMEX=1'";

OleDbConnection OleConn = new OleDbConnection(strConn);

OleConn.Open();

sql = "SELECT * FROM [Sheet1$]";

OleDbDataAdapter OleDaExcel = new OleDbDataAdapter(sql,OleConn);

DataSet OleDsExcle = new DataSet();

OleDaExcel.Fill(OleDsExcle,"aa");

OleConn.Close();

return OleDsExcle;

}

#endregion

破解图片的方法

GF.OCR OCR1;

private void button1_Click(object sender, EventArgs e)

{

CookieContainer currentcookie = new CookieContainer();

string htmldoc = httpService.getpage("http://www.xx.com", ref currentcookie, null);

// webBrowser1.DocumentText=htmldoc;

OCR1 = new OCR();

OCR1.Abort = false;

OCR1.ActivationKey = "Demo";

OCR1.AllCharacterFile = "AllCharacters.nn";

OCR1.AllCharacterMapFile = "AllCharacters.map";

OCR1.AnalyzeLowerCaseCharacters = true;

OCR1.AnalyzeNumericCharacters = true;

OCR1.AnalyzeSpecialCharacters = true;

OCR1.BarcodeType = GF.BarcodeTypes.Code39Extended;

OCR1.BitmapImageFile = "";

OCR1.Brightness = 7;

OCR1.CheckSum = true;

OCR1.DefaultFolder = "";

OCR1.Despeckle = 1;

OCR1.ErrorCharacter = '?';

OCR1.ErrorCorrection = true;

OCR1.ExtendedPictureBox = null;

OCR1.Language = GF.LanguageType.English;

OCR1.LowerCaseCharacterFile = "NumericCharacters.nn";

OCR1.LowerCaseCharacterMapFile = "NumericCharacters.map";

OCR1.MaximumCharacters = 5000;

OCR1.MaximumHeight = 150;

OCR1.MaximumSize = 10000;

OCR1.MaximumWidth = 150;

OCR1.NumericCharacterFile = "NumericCharacters.nn";

OCR1.NumericCharacterMapFile = "NumericCharacters.map";

OCR1.OCRType = GF.OCRTypes.Text;

OCR1.OrderID = "Demo";

OCR1.ProductName = "Demo";

OCR1.RegistrationCodes = "Demo";

OCR1.RemoveHorizontal = 0;

OCR1.RemoveVertical = 0;

OCR1.SectionHorizontalSpace = 1.5;

OCR1.SectionVerticalSpace = 1.5;

OCR1.SpecialCharacterFile = "NumericCharacters.nn";

OCR1.SpecialCharacterMapFile = "NumericCharacters.map";

OCR1.Statistics = false;

OCR1.UpperCaseCharacterFile = "NumericCharacters.nn";

OCR1.UpperCaseCharacterMapFile = "NumericCharacters.map";

string resultString = null;

try

{

resultString = Regex.Match(htmldoc, @"(?<url>/m4center/verifyImage"?statusID="d*&bindID="d*&serverID="d*)").Value;

resultString = "http://www.xx.com/" + resultString;

this.toolStripStatusLabel1.Text = resultString;

Image img = httpService.getStream(resultString, ref currentcookie, null);

pictureBox1.Image = img;

// 上 右 下

Rectangle cloneRect = new Rectangle(13, 4, 78, 27); //

Bitmap bimg = (Bitmap)img;

bimg = bimg.Clone(cloneRect, img.PixelFormat);

pictureBox2.Image = bimg;

// int dgGrayValue = 150;

int dgGrayValue =vc.GetDgGrayValue(bimg);

vc.GrayScale(bimg);

// vc.ClearNoise(dgGrayValue, bimg);

vc.ClearNoise(dgGrayValue, 1, bimg);

//vc.BlackWhite(bimg, dgGrayValue);

pictureBox3.Image = bimg;

OCR1.BitmapImage = bimg;

OCR1.Process();

this.toolStripStatusLabel1.Text = OCR1.Text;

OCR1.Dispose();

return;

}

catch (ArgumentException ex)

{

// Syntax error in the regular expression

}

//送值

string postdata = string.Format("service=direct/0/Login/form&sp=S0&Form0=serialField,passwordField,annexPwdField,

submit&serialField={0}&passwordField={1}&annexPwdField={2}&submit=+%B5%C7%C2%BC+",

mobile.Trim(), passwd, vcode);

string htmldoc = httpService.postpage(homepageurl, postdata, ref currentcookie, proxy);

}

}