using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Text;
namespace ZC.Common
{
public class ValidateCode
{
public static string CreateValidateNumber(int length)
{
int[] randMembers = new int[length];
int[] validateNums = new int[length];
System.Text.StringBuilder validateNumberStr = new System.Text.StringBuilder();
//生成起始序列值
int seekSeek = unchecked((int)DateTime.Now.Ticks);
Random seekRand = new Random(seekSeek);
int beginSeek = (int)seekRand.Next(0, Int32.MaxValue - length * 10000);
int[] seeks = new int[length];
for (int i = 0; i < length; i++)
{
beginSeek += 10000;
seeks[i] = beginSeek;
}
//生成随机数字
for (int i = 0; i < length; i++)
{
Random rand = new Random(seeks[i]);
int pownum = 1 * (int)Math.Pow(10, length);
randMembers[i] = rand.Next(pownum, Int32.MaxValue);
}
//抽取随机数字
for (int i = 0; i < length; i++)
{
string numStr = randMembers[i].ToString();
int numLength = numStr.Length;
Random rand = new Random();
int numPosition = rand.Next(0, numLength - 1);
validateNums[i] = Int32.Parse(numStr.Substring(numPosition, 1));
}
//生成验证码
for (int i = 0; i < length; i++)
{
validateNumberStr.Append(validateNums[i].ToString());
}
return validateNumberStr.ToString();
}
public static byte[] CreateValidateGraphic(string validateNum)
{
using (Bitmap image = new Bitmap((int)Math.Ceiling(validateNum.Length * 12.5+10), 22))
{
using (Graphics g = Graphics.FromImage(image))
{
//生成随机生成器
Random random = new Random();
//清空图片背景色
g.Clear(System.Drawing.Color.White);
//画图片的干扰线
for (int i = 0; i < 25; i++)
{
int x1 = random.Next(image.Width);
int x2 = random.Next(image.Width);
int y1 = random.Next(image.Height);
int y2 = random.Next(image.Height);
g.DrawLine(new Pen(System.Drawing.Color.Silver), x1, y1, x2, y2);
}
System.Drawing.Font font = new System.Drawing.Font("Arial", 14, (FontStyle.Bold | FontStyle.Italic));
LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height),
System.Drawing.Color.Blue, System.Drawing.Color.DarkRed, 1.2f, true);
g.DrawString(validateNum, font, brush, 3, 2);
//画图片的前景干扰点
for (int i = 0; i < 100; i++)
{
int x = random.Next(image.Width);
int y = random.Next(image.Height);
image.SetPixel(x, y, System.Drawing.Color.FromArgb(random.Next()));
}
//画图片的边框线
g.DrawRectangle(new Pen(System.Drawing.Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
//保存图片数据
using (MemoryStream stream = new MemoryStream())
{
image.Save(stream, ImageFormat.Jpeg);
return stream.ToArray();
}
}
}
}
}
}