using System;
using ;
using ;
using ;
namespace
{
/// <summary>
/// Verification code class
/// </summary>
public class Rand
{
#region Generate random numbers
/// <summary>
/// Generate random numbers
/// </summary>
/// <param name="length">Generate length</param>
public static string Number(int Length)
{
return Number(Length, false);
}
/// <summary>
/// Generate random numbers
/// </summary>
/// <param name="Length">Generate length</param>
/// <param name="Sleep">Do you want to block the current thread before generation to avoid duplication</param>
public static string Number(int Length, bool Sleep)
{
if (Sleep) (3);
string result = "";
random = new Random();
for (int i = 0; i < Length; i++)
{
result += (10).ToString();
}
return result;
}
#endregion
#region Generate random letters and numbers
/// <summary>
/// Generate random letters and numbers
/// </summary>
/// <param name="IntStr">Generate Length</param>
public static string Str(int Length)
{
return Str(Length, false);
}
/// <summary>
/// Generate random letters and numbers
/// </summary>
/// <param name="Length">Generate length</param>
/// <param name="Sleep">Do you want to block the current thread before generation to avoid duplication</param>
public static string Str(int Length, bool Sleep)
{
if (Sleep) (3);
char[] Pattern = new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z' };
string result = "";
int n = ;
random = new Random(~unchecked((int)));
for (int i = 0; i < Length; i++)
{
int rnd = (0, n);
result += Pattern[rnd];
}
return result;
}
#endregion
#region Generate random numbers of random letters
/// <summary>
/// Generate random numbers of random letters
/// </summary>
/// <param name="IntStr">Generate Length</param>
public static string Str_char(int Length)
{
return Str_char(Length, false);
}
/// <summary>
/// Generate random numbers of random letters
/// </summary>
/// <param name="Length">Generate length</param>
/// <param name="Sleep">Do you want to block the current thread before generation to avoid duplication</param>
public static string Str_char(int Length, bool Sleep)
{
if (Sleep) (3);
char[] Pattern = new char[] { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z' };
string result = "";
int n = ;
random = new Random(~unchecked((int)));
for (int i = 0; i < Length; i++)
{
int rnd = (0, n);
result += Pattern[rnd];
}
return result;
}
#endregion
}
/// <summary>
/// Verify the picture class
/// </summary>
public class YZMHelper
{
#region Private Field
private string text;
private Bitmap image;
private int letterCount = 4; //The number of verification code digits
private int letterWidth = 16; //The width range of a single font
private int letterHeight = 20; //The height range of a single font
private static byte[] randb = new byte[4];
private static RNGCryptoServiceProvider rand = new RNGCryptoServiceProvider();
private Font[] fonts =
{
new Font(new FontFamily("Times New Roman"),10 +Next(1),),
new Font(new FontFamily("Georgia"), 10 + Next(1),),
new Font(new FontFamily("Arial"), 10 + Next(1),),
new Font(new FontFamily("Comic Sans MS"), 10 + Next(1),)
};
#endregion
#region Public properties
/// <summary>
/// Verification code
/// </summary>
public string Text
{
get { return ; }
}
/// <summary>
/// Verification code picture
/// </summary>
public Bitmap Image
{
get { return ; }
}
#endregion
#region constructor
public YZMHelper()
{
= 0;
= true;
= (-1);
("pragma", "no-cache");
= "no-cache";
= (4);
CreateImage();
}
#endregion
#region Private Method
/// <summary>
/// Get the next random number
/// </summary>
/// <param name="max">maximum value</param>
private static int Next(int max)
{
(randb);
int value = BitConverter.ToInt32(randb, 0);
value = value % (max + 1);
if (value < 0) value = -value;
return value;
}
/// <summary>
/// Get the next random number
/// </summary>
/// <param name="min">minimum value</param>
/// <param name="max">maximum value</param>
private static int Next(int min, int max)
{
int value = Next(max - min) + min;
return value;
}
#endregion
#region Public Method
/// <summary>
/// Draw the verification code
/// </summary>
public void CreateImage()
{
int int_ImageWidth = * letterWidth;
Bitmap image = new Bitmap(int_ImageWidth, letterHeight);
Graphics g = (image);
();
for (int i = 0; i < 2; i++)
{
int x1 = Next( - 1);
int x2 = Next( - 1);
int y1 = Next( - 1);
int y2 = Next( - 1);
(new Pen(), x1, y1, x2, y2);
}
int _x = -12, _y = 0;
for (int int_index = 0; int_index < ; int_index++)
{
_x += Next(12, 16);
_y = Next(-2, 2);
string str_char = (int_index, 1);
str_char = Next(1) == 1 ? str_char.ToLower() : str_char.ToUpper();
Brush newBrush = new SolidBrush(GetRandomColor());
Point thePos = new Point(_x, _y);
(str_char, fonts[Next( - 1)], newBrush, thePos);
}
for (int i = 0; i < 10; i++)
{
int x = Next( - 1);
int y = Next( - 1);
(x, y, (Next(0, 255), Next(0, 255), Next(0, 255)));
}
image = TwistImage(image, true, Next(1, 3), Next(4, 6));
(new Pen(, 1), 0, 0, int_ImageWidth - 1, (letterHeight - 1));
= image;
}
/// <summary>
/// font random colors
/// </summary>
public Color GetRandomColor()
{
Random RandomNum_First = new Random((int));
(RandomNum_First.Next(50));
Random RandomNum_Sencond = new Random((int));
int int_Red = RandomNum_First.Next(180);
int int_Green = RandomNum_Sencond.Next(180);
int int_Blue = (int_Red + int_Green > 300) ? 0 : 400 - int_Red - int_Green;
int_Blue = (int_Blue > 255) ? 255 : int_Blue;
return (int_Red, int_Green, int_Blue);
}
/// <summary>
/// Sine curve Wave twisted picture
/// </summary>
/// <param name="srcBmp">Picture path</param>
/// <param name="bXDir">Select as True if distorted</param>
/// <param name="nMultValue">The amplitude multiple of the waveform, the greater the degree of distortion, generally 3</param>
/// <param name="dPhase">The starting phase of the waveform, value interval [0-2*PI)</param>
public TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase)
{
double PI = 6.283185307179586476925286766559;
Bitmap destBmp = new Bitmap(, );
Graphics graph = (destBmp);
(new SolidBrush(), 0, 0, , );
();
double dBaseAxisLen = bXDir ? (double) : (double);
for (int i = 0; i < ; i++)
{
for (int j = 0; j < ; j++)
{
double dx = 0;
dx = bXDir ? (PI * (double)j) / dBaseAxisLen : (PI * (double)i) / dBaseAxisLen;
dx += dPhase;
double dy = (dx);
int nOldX = 0, nOldY = 0;
nOldX = bXDir ? i + (int)(dy * dMultValue) : i;
nOldY = bXDir ? j : j + (int)(dy * dMultValue);
Color color = (i, j);
if (nOldX >= 0 && nOldX <
&& nOldY >= 0 && nOldY < )
{
(nOldX, nOldY, color);
}
}
}
();
return destBmp;
}
#endregion
}
}