/// <summary>
/// 验证码
/// </summary>
/// <param name="verify_code"></param>
/// <returns></returns>
public static bool CheckVerifyCode(string verify_code)
{
var test = RedisCacheHelper.Get(verify_code.ToLower());
if (string.IsNullOrEmpty(test))
{
return(false);
}
else
{
RedisCacheHelper.Del(verify_code.ToLower());
return(true);
}
}
/// <summary>
/// 生成验证码二进制图片
/// </summary>
/// <param name="numbers"></param>
/// <returns></returns>
public static MemoryStream GetVerifyCode(int numbers = 4)
{
int codeW = 80;
int codeH = 30;
int fontSize = 16;
string chkKey = string.Empty;
string chkCode = string.Empty;
//颜色列表，用于验证码、噪线、噪点
Color[] color = { Color.Black, Color.Red, Color.Blue, Color.Green, Color.Orange, Color.Brown, Color.Brown, Color.DarkBlue };
//字体列表，用于验证码
string[] font = { "Times New Roman" };
//验证码的字符集，去掉了一些容易混淆的字符
char[] character = { '2', '3', '4', '5', '6', '8', '9', 'a', 'b', 'd', 'e', 'f', 'h', 'k', 'm', 'n', 'r', 'x', 'y', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'L', 'M', 'N', 'P', 'R', 'S', 'T', 'W', 'X', 'Y' };
Random rnd = new Random();
//生成验证码字符串
for (int i = 0; i < numbers; i++)
{
chkCode += character[rnd.Next(character.Length)];
}
chkKey = MD5Helper.MD5Encrypt16(chkCode.ToLower());
try
{
//保存在redis里
RedisCacheHelper.Set(chkCode.ToLower(), chkKey.ToLower(), 60);
}
catch (Exception ex)
{
throw ex;
}
//创建画布
Bitmap bmp = new Bitmap(codeW, codeH);
Graphics g = Graphics.FromImage(bmp);
g.Clear(Color.White);
//画噪线
for (int i = 0; i < 1; i++)
{
int x1 = rnd.Next(codeW);
int y1 = rnd.Next(codeH);
int x2 = rnd.Next(codeW);
int y2 = rnd.Next(codeH);
Color clr = color[rnd.Next(color.Length)];
g.DrawLine(new Pen(clr), x1, y1, x2, y2);
}
//画验证码字符串
for (int i = 0; i < chkCode.Length; i++)
{
string fnt = font[rnd.Next(font.Length)];
Font ft = new Font(fnt, fontSize);
Color clr = color[rnd.Next(color.Length)];
g.DrawString(chkCode[i].ToString(), ft, new SolidBrush(clr), (float)i * 18, (float)0);
}
//将验证码图片写入内存流，并将其以 "image/Png" 格式输出
MemoryStream stream = new MemoryStream();
try
{
bmp.Save(stream, ImageFormat.Png);
return(stream);
}
catch (Exception ex)
{
throw ex;
}
finally
{
bmp.Dispose();
}
}
