C#生成验证码（转载）

来源：互联网发布：广州火舞软件编辑：程序博客网时间：2024/05/01 11:45

生成图片类：

public class CreatePIC
{
//以下为默认参数
public string AllChar = "1,2,3,4,5,6,7,8,9,0,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,W,X,Y,Z";
public Color DrawColor = Color.BlueViolet;
public bool FontTextRenderingHint = false;
public int ImageHeight = 0x17;
private byte TrueValidateCodeCount = 4;
protected string ValidateCode = "";
public string ValidateCodeFont = "Arial";
public float ValidateCodeSize = 13f;

public byte ValidateCodeCount
{
get
{
return this.TrueValidateCodeCount;
}
set
{
if (value > 4)
{
this.TrueValidateCodeCount = value;
}
}
}

/// <summary>
/// 绘制图片(文字)
/// </summary>
/// <param name="ImageFrame">返回图片Bitmap</param>
private void CreateImageBmp(out Bitmap ImageFrame)
{
char[] chArray = this.ValidateCode.ToCharArray(0, this.ValidateCodeCount);
int width = (int)(((this.TrueValidateCodeCount * this.ValidateCodeSize) * 1.3) + 4.0);
ImageFrame = new Bitmap(width, this.ImageHeight);
Graphics graphics = Graphics.FromImage(ImageFrame);
graphics.Clear(Color.White);
Font font = new Font(this.ValidateCodeFont, this.ValidateCodeSize, FontStyle.Bold);
Brush brush = new SolidBrush(this.DrawColor);
int maxValue = (int)Math.Max((float)((this.ImageHeight - this.ValidateCodeSize) - 3f), (float)2f);
Random random = new Random();
for (int i = 0; i < this.TrueValidateCodeCount; i++)
{
int[] numArray = new int[] { (((int)(i * this.ValidateCodeSize)) + random.Next(1)) + 3, random.Next(maxValue) };
Point point = new Point(numArray[0], numArray[1]);
if (this.FontTextRenderingHint)
{
graphics.TextRenderingHint = TextRenderingHint.SingleBitPerPixel;
}
else
{
graphics.TextRenderingHint = TextRenderingHint.AntiAlias;
}
graphics.DrawString(chArray[i].ToString(), font, brush, (PointF)point);
}
graphics.Dispose();
}

/// <summary>
/// 绘制图片(线条)
/// </summary>
/// <param name="ImageFrame">返回图片Bitmap</param>
private void DisposeImageBmp(ref Bitmap ImageFrame)
{
Graphics graphics = Graphics.FromImage(ImageFrame);
Pen pen = new Pen(this.DrawColor, 1f);
Random random = new Random();
Point[] pointArray = new Point[2];
for (int i = 0; i < 25; i++)//图片上线条的个数
{
pointArray[0] = new Point(random.Next(ImageFrame.Width), random.Next(ImageFrame.Height));
pointArray[1] = new Point(random.Next(ImageFrame.Width), random.Next(ImageFrame.Height));
graphics.DrawLine(pen, pointArray[0], pointArray[1]);
}
graphics.Dispose();
}

/// <summary>
/// 初始化
/// </summary>
private void CreateValidate()
{
this.ValidateCode = "";
string[] strArray = this.AllChar.Split(new char[] { ',' });
int index = -1;
Random random = new Random();
for (int i = 0; i < this.ValidateCodeCount; i++)
{
if (index != -1)
{
random = new Random((i * index) * ((int)DateTime.Now.Ticks));
}
int num3 = random.Next(0x23);
if (index == num3)
{
this.CreateValidate();
}
index = num3;
this.ValidateCode = this.ValidateCode + strArray[index];
}
if (this.ValidateCode.Length > this.TrueValidateCodeCount)
{
this.ValidateCode = this.ValidateCode.Remove(this.TrueValidateCodeCount);
}
}

/// <summary>
/// 将图片写入流
/// </summary>
public MemoryStream CreateImage()
{
CreateValidate();
MemoryStream stream = new MemoryStream();
Bitmap bitmap;
this.CreateImageBmp(out bitmap);
this.DisposeImageBmp(ref bitmap);
bitmap.Save(stream, ImageFormat.Png);
//bitmap.Save("C:/123.gif");
return stream;
}
}

-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

ashx:

public void ProcessRequest(HttpContext context)
{
CreatePIC pic = new CreatePIC();
#region 对验证码进行设置(不进行设置时,将以默认值生成)
//验证码位数，不小于4位
pic.ValidateCodeCount = 4;
//验证码字体型号(默认13)
pic.ValidateCodeSize = 18;
//验证码图片高度,高度越大,字符的上下偏移量就越明显
pic.ImageHeight = 40;
//验证码字符及线条颜色(需要参考颜色类)
pic.DrawColor = System.Drawing.Color.BlueViolet;
//验证码字体(需要填写服务器安装的字体)
pic.ValidateCodeFont = "Arial";
//验证码字符是否消除锯齿
pic.FontTextRenderingHint = false;
//定义验证码中所有的字符(","分离),似乎暂时不支持中文
pic.AllChar = "1,2,3,4,5,6,7,8,9,0,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,W,X,Y,Z";
#endregion
MemoryStream stream = pic.CreateImage();
context.Response.ContentType = "image/png";
context.Response.BinaryWrite(stream.ToArray());
}

HTML:

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="../jquery-easyui-1.3.2/themes/default/easyui.css"/>
<link rel="stylesheet" type="text/css" href="../jquery-easyui-1.3.2/themes/icon.css"/>
<script type="text/javascript" src="../jquery-easyui-1.3.2/jquery-1.8.0.min.js"></script>
<script type="text/javascript" src="../jquery-easyui-1.3.2/jquery.easyui.min.js"></script>
<script type="text/javascript">
function next(obj) {
$("#imgShow").attr("src", "test1Do.ashx?time_=" + Math.random());
}
</script>
</head>
<body>
<table>
<tr>
<td style="border: thin solid #000000">
<img src="test1Do.ashx" id="imgShow" />
</td>
<td>
<a onclick="next(this)" href="#">看不清，换一个</a>
</td>
</tr>
</table>
</body>
</html>

效果：

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