|
|
using System;
|
|
|
using System.Collections.Generic;
|
|
|
using System.Drawing;
|
|
|
using System.Drawing.Imaging;
|
|
|
using System.IO;
|
|
|
using System.Runtime.Versioning;
|
|
|
using System.Text;
|
|
|
|
|
|
namespace VOL.Core.Utilities
|
|
|
{
|
|
|
public static class VierificationCode
|
|
|
{
|
|
|
private static readonly string[] _chars = new string[] { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "P", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z" };
|
|
|
public static string RandomText()
|
|
|
{
|
|
|
string code = "";//产生的随机数
|
|
|
int temp = -1;
|
|
|
Random rand = new Random();
|
|
|
for (int i = 1; i < 5; i++)
|
|
|
{
|
|
|
if (temp != -1)
|
|
|
{
|
|
|
rand = new Random(i * temp * unchecked((int)DateTime.Now.Ticks));
|
|
|
}
|
|
|
int t = rand.Next(61);
|
|
|
if (temp != -1 && temp == t)
|
|
|
{
|
|
|
return RandomText();
|
|
|
}
|
|
|
temp = t;
|
|
|
code += _chars[t];
|
|
|
}
|
|
|
return code;
|
|
|
}
|
|
|
|
|
|
[SupportedOSPlatform("Windows")]
|
|
|
[Obsolete("仅在 Windows 上支持 System.Drawing.Common,具体请参考:https://docs.microsoft.com/zh-cn/dotnet/core/compatibility/core-libraries/6.0/system-drawing-common-windows-only")]
|
|
|
public static string CreateBase64Imgage(string code)
|
|
|
{
|
|
|
Random random = new Random();
|
|
|
//验证码颜色集合
|
|
|
Color[] c = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };
|
|
|
//验证码字体集合
|
|
|
string[] fonts = { "Verdana", "Microsoft Sans Serif", "Comic Sans MS", "Arial", "宋体" };
|
|
|
|
|
|
using var img = new Bitmap((int)code.Length * 18, 32);
|
|
|
using var g = Graphics.FromImage(img);
|
|
|
g.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);
|
|
|
g.DrawRectangle(new Pen(Color.LightGray, 0), x, y, 1, 1);
|
|
|
}
|
|
|
//验证码绘制在g中
|
|
|
for (int i = 0; i < code.Length; i++)
|
|
|
{
|
|
|
int cindex = random.Next(7);//随机颜色索引值
|
|
|
int findex = random.Next(5);//随机字体索引值
|
|
|
Font f = new Font(fonts[findex], 15, FontStyle.Bold);//字体
|
|
|
Brush b = new SolidBrush(c[cindex]);//颜色
|
|
|
int ii = 4;
|
|
|
if ((i + 1) % 2 == 0)//控制验证码不在同一高度
|
|
|
{
|
|
|
ii = 2;
|
|
|
}
|
|
|
g.DrawString(code.Substring(i, 1), f, b, 3 + (i * 12), ii);//绘制一个验证字符
|
|
|
}
|
|
|
using (MemoryStream stream = new MemoryStream())
|
|
|
{
|
|
|
img.Save(stream, ImageFormat.Jpeg);
|
|
|
byte[] b = stream.ToArray();
|
|
|
return Convert.ToBase64String(stream.ToArray());
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
}
|