public byte[] CreateImage(out string code, int length = 4)
{
code = RandomUtils.CreateRandom(length);
Bitmap Img = null;
Graphics graphics = null;
MemoryStream ms = null;
Random random = new Random();
//颜色集合
Color[] color = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };
//字体集合
string[] fonts = { "Verdana", "Microsoft Sans Serif", "Comic Sans MS", "Arial", "宋体" };
//定义图像的大小，生成图像的实例
Img = new Bitmap((int)code.Length * 17, 32);
graphics = Graphics.FromImage(Img); //从Img对象生成新的Graphics对象
graphics.Clear(Color.White); //背景设为白色
//在随机位置画背景点
for (int i = 0; i < 100; i++)
{
int x = random.Next(Img.Width);
int y = random.Next(Img.Height);
graphics.DrawRectangle(new Pen(Color.LightGray, 0), x, y, 1, 1);
}
//验证码绘制在graphics中
for (int i = 0; i < code.Length; i++)
{
int colorIndex = random.Next(7); //随机颜色索引值
int fontIndex = random.Next(4); //随机字体索引值
int fontSize = random.Next(13, 18);
Font font = new Font(fonts[fontIndex], fontSize, FontStyle.Bold); //字体
Brush brush = new SolidBrush(color[colorIndex]); //颜色
int y = 4;
if ((i + 1) % 2 == 0) //控制验证码不在同一高度
{
y = 2;
}
graphics.DrawString(code.Substring(i, 1), font, brush, 3 + (i * 13), y); //绘制一个验证字符
}
ms = new MemoryStream(); //生成内存流对象
Img.Save(ms, ImageFormat.Png); //将此图像以Png图像文件的格式保存到流中
graphics.Dispose();
Img.Dispose();
ms.Close();
ms.Dispose();
return(ms.GetBuffer());
}
//设置Cookie
public void SetAdiminCookie(AdminLogin admin)
{
AdminToken adminToken = new AdminToken
{
UserName = admin.UserName,
Password = admin.Password,
RandomCode = RandomUtils.CreateRandom(16)
};
string tokrn = JsonConvert.SerializeObject(adminToken);
string cipherToken = EncryptAES.Encrypt(WebSettings.Value.CipherKey, tokrn);
HttpExtension.SetCookie(Consts.Cookie_AdminToken, cipherToken);
}