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);
}
}
