标准验证码图片生成

int y2 = random.Next(image.Height);
return CreateChineseCode(length);
default:
return null;
}
}
/// <summary>
{
string chars = "0123456789qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM";
string code = "";
if (length <= 0)
return CreateImage(code, width);
}
/// <summary>
/// 生成验证码（汉字）
/// </summary>
/// <param name="length">指定验证码的长度</param>
string code3 = gb.GetString((byte[])Convert.ChangeType(bytes[2], typeof(byte[])));
string code4 = gb.GetString((byte[])Convert.ChangeType(bytes[3], typeof(byte[])));
/// 生成验证码（数字+字母）
/// </summary>
/// <param name="length">指定验证码的长度</param>
/// <returns>数字+字母字符串</returns>
public byte[] CreateValidateCode(int length)
}
/// <summary>
/// 生成验证码（数字）
/// </summary>
/// <param name="length">指定验证码的长度</param>
/// <returns>数字字符串</returns>
/// <returns>汉字字符串</returns>
public byte[] CreateChineseCode(int length)
{
Encoding gb = Encoding.GetEncoding("gb2312"); object[] bytes = CreateString(length);
//清空图片背景色
g.Clear(Color.White);
//画图片的干扰线
for (int i = 0; i < 25; i++)
{
string checkCode = String.Empty;
//创建Random对象
Random random = new Random();
//使用For循环生成4个数字
for (int i = 0; i < length; i++)
/// <returns></returns>
public byte[] select(int length, int num)
{
switch (num) { Fra bibliotekcase 1:
{
int index = rnd.Next(0, 52);
code = code + chars[index];
}
double width = 18.0;
//数字+字母
return CreateValidateCode(length);
case 2:
//纯数字
return CreateNumCode(length);
Graphics g = Graphics.FromImage(image);
try
{
//生成随机生成器
Random random = new Random();
public byte[] CreateLetterCode(int length)
{
string chars = "qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM";
string code = "";
/// 创建验证码的图片
/// </summary>
public byte[] CreateValidateGraphic(string validateCode, double width)
{
Bitmap image = new Bitmap((int)Math.Ceiling(validateCode.Length * width), 22);
case 3:
//纯字母
return CreateLetterCode(length);
case 4:
//汉字
if (length <= 0)
{
return null;
}
Random rnd = new Random();
for (int i = 0; i < length; i++)
//根据汉字字节解码出中文汉字
string code1 = gb.GetString((byte[])Convert.ChangeType(bytes[0], typeof(byte[])));
string code2 = gb.GetString((byte[])Convert.ChangeType(bytes[1], typeof(byte[])));
checkCode += code.ToString();
}
//返回字符串
double width = 18.0;
return CreateImage(checkCode, width);
{
//生成一个随机数
number = random.Next();
//将数字转换成为字符型
code = (char)('0' + (char)(number % 10));
int index = rnd.Next(0, 62);
code = code + chars[index];
}
double width = 18.0;
return CreateImage(code, width);
public byte[] CreateNumCode(int length)
{
//创建整型变量
int number;
//创建字符型变量
char code;
//创建字符串变量并初始化为空
{
return null;
}
Random rnd = new Random();
for (int i = 0; i < length; i++)
{
{
internal class VerifyCodeDataAccess : DataAccessBase
{
public byte[] GetVerifyCode()
{
return null;
}
int x1 = random.Next(image.Width);
int x2 = random.Next(image.Width);
int y1 = random.Next(image.Height);
/// <summary>
/// 选择要生成的验证码样式
/// </summary>
/// <param name="length">指定验证码的长度</param>
/// <param name="num">样式编号</param>
string code = code1 + code2 + code3 + code4;
double width = 30.0;
return CreateImage(code, width);
}
/// <summary>
}
/// <summary>
/// 生成验证码（字母）
/// </summary>
/// <param name="length">指定验证码的长度</param>
/// <returns>字母字符串</returns>
using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;
using System.Text;
namespace Impression.Logic.DataAccess