后台生产验证码code和byte[]图片

ゝ一纸荒年。 2021-09-17 15:52 222阅读 0赞

# [后台生产验证码code和byte\[\]图片][code_byte] #

引用命名空间

using System.Drawing;  
using System.Drawing.Drawing2D;  
using System.Drawing.Imaging;  
using System.IO;

生成方法

/// <summary>生成验证码  
/// </summary>  
/// <returns></returns>  
public string GetCheckCode()  
\{  
int number;  
char code;  
string checkCode = String.Empty;

System.Random random = new Random();  
do  
\{  
number = random.Next();  
if (number % 2 == 0)  
code = (char)('0' + (char)(number % 10));  
else  
code = (char)('A' + (char)(number % 26));  
if (code == 'o' || code == 'O') continue;  
checkCode += code.ToString();  
\} while (checkCode.Length < 4);  
//code储存.在session  
KMHC.Infrastructure.SessionHelper.SetSession("checkCode", checkCode.ToUpper());  
  
byte\[\] bytes = CreateValidateGraphic(checkCode.ToLower());  
var response = new BaseResponse<string>();  
var src = "data:image/jpeg;base64," + Convert.ToBase64String(bytes);//Base64转换 HTML标签img 直接显示 <img src="" />  
return src;  
\}

/// <summary>  
/// 创建验证码的图片  
/// </summary>  
/// <param name="containsPage"></param>  
/// <param name="validateNum"></param>  
public static byte\[\] CreateValidateGraphic(string checkCode)  
\{  
Bitmap image = new Bitmap((int)Math.Ceiling(checkCode.Length \* 13.5), 22);  
Graphics g = Graphics.FromImage(image);  
try  
\{  
//生成随机生成器   
Random random = new Random();  
//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++)  
\{  
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(Color.Silver), x1, y1, x2, y2);  
\}  
Font font = new Font("Arial", 12, (FontStyle.Bold | FontStyle.Italic));  
LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height),  
Color.Blue, Color.DarkRed, 1.2f, true); g.DrawString(checkCode, 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, Color.FromArgb(random.Next()));  
\}  
//画图片的边框线   
g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);  
//保存图片数据   
MemoryStream stream = new MemoryStream();  
image.Save(stream, ImageFormat.Jpeg);  
//输出图片

return stream.ToArray();  
\}  
finally  
\{  
g.Dispose();  
image.Dispose();  
\}  
\}

[code_byte]: http://www.cnblogs.com/Arvin-Ou/p/8670717.html