C#生成验证码图片的方法

本文实例为大家分享了C#生成验证码图片的具体代码,供大家参考,具体内容如下

/// <summary>

/// 生成验证码图片

/// </summary>

/// <returns></returns>

public byte[] GetVerifyCode()

{

int codeW = 80;

int codeH = 40;

int fontSize = 18;

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 < 4; i++)

{

chkCode += character[rnd.Next(character.Length)];

}

//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 ms = new MemoryStream();

try

{

bmp.Save(ms, ImageFormat.Png);

return ms.ToArray();

}

catch (Exception)

{

return null;

}

finally

{

g.Dispose();

bmp.Dispose();

}

}

以上是 C#生成验证码图片的方法 的全部内容, 来源链接: utcz.com/z/324132.html

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