Asp.net中我要自己手写验证码,哪位有相关代码
Asp.net中我要自己手写验证码,哪位有相关代码
[解决办法]
public class ValidCode
{
public ValidCode()
{
}
private string GenerateCheckCode()
{
int number;
char code;
string checkCode = String.Empty;
System.Random random = new Random();
for (int i = 0; i < 5; i++)
{
number = random.Next();
if (number % 2 == 0)
code = (char)('0' + (char)(number % 10));
else
code = (char)('A' + (char)(number % 26));
checkCode += code.ToString();
}
// HttpContext.Current.Response.Cookies.Add(new HttpCookie("CheckCode", checkCode));
return checkCode;
}
/// <summary>
/// 生成验证码图片
/// </summary>
public void CreateCheckCodeImage(string checkCode)
{
if (checkCode == null || checkCode.Trim() == String.Empty)
return;
System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 12.5)), 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);
//画图片的背景噪音线
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 System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic));
System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);
g.DrawString(checkCode, font, brush, 2, 2);
//画图片的前景噪音点
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);
System.IO.MemoryStream ms = new System.IO.MemoryStream();
image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
HttpContext.Current.Response.ClearContent();
HttpContext.Current.Response.ContentType = "image/Gif";
HttpContext.Current.Response.BinaryWrite(ms.ToArray());
}
finally
{
g.Dispose();
image.Dispose();
}
}
public void ValidateCode(string VNum)
{
Bitmap validateimage;
Graphics g;
validateimage = new Bitmap(50, 20, PixelFormat.Format24bppRgb);
g = Graphics.FromImage(validateimage);
g.DrawString(VNum, new Font("Comic Sans MS", 12), new SolidBrush(Color.White), new PointF(3, 0));
g.FillRectangle(new LinearGradientBrush(new Point(0, 0), new Point(110, 20), Color.FromArgb(0, 0, 0, 0), Color.FromArgb(255, 255, 60, 40)), 0, 0, 120, 30);
g.Save();
MemoryStream ms = new MemoryStream();
validateimage.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
HttpContext.Current.Response.ClearContent();
HttpContext.Current.Response.ContentType = "image/gif";
HttpContext.Current.Response.BinaryWrite(ms.ToArray());
HttpContext.Current.Response.End();
}
/// 生成随机数
public string MakeValidateCode()
{
char[] s = new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' };
string num = "";
Random r = new Random();
for (int i = 0; i < 4; i++)
{
num += s[r.Next(0, s.Length)].ToString();
}
return num;
}
[解决办法]
楼上的正确
[解决办法]
忽忽~借用来参考下！
[解决办法]
验证码类：
public class ValidateCode{ public ValidateCode() { // // TODO: 在此处添加构造函数逻辑 // } /// <summary> /// 该方法是将生成的随机数写入图像文件 /// </summary> /// <param name="VNum">VNum是一个随机数</param> public MemoryStream Create(out string VNum) { VNum = RndNum(4); Bitmap Img = null; Graphics g = null; MemoryStream ms = null; System.Random random = new Random(); Color[] c = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple }; 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)VNum.Length * 18, 32); g = Graphics.FromImage(Img);//从Img对象生成新的Graphics对象 g.Clear(Color.White); //画背景点 for (int i = 0; i < 100; i++) { int x = random.Next(Img.Width); int y = random.Next(Img.Height); //Img.SetPixel(x, y,Color.LightGray); g.DrawRectangle(new Pen(Color.LightGray, 0), x, y, 1, 1); } for (int i = 0; i < VNum.Length; i++) { int cindex = random.Next(7); int findex = random.Next(5); Font f = new System.Drawing.Font(fonts[findex], 13, System.Drawing.FontStyle.Bold); Brush b = new System.Drawing.SolidBrush(c[cindex]); int ii = 4; if ((i + 1) % 2 == 0) { ii = 2; } g.DrawString(VNum.Substring(i, 1), f, b, 3 + (i * 12), ii); } ms = new MemoryStream();//生成内存流对象 Img.Save(ms, ImageFormat.Jpeg);//将此图像以Png图像文件的格式保存到流中 //回收资源 g.Dispose(); Img.Dispose(); return ms; } /// <summary> /// 该方法用于生成指定位数的随机数 /// </summary> /// <param name="VcodeNum">参数是随机数的位数</param> /// <returns>返回一个随机数字符串</returns> private string RndNum(int VcodeNum) { string Vchar = "1,1,2,3,4,5,6,7,8,9,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,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"; string[] VcArray = Vchar.Split(new Char[] { ',' });//拆分成数组 string VNum = ""; int temp = -1;//记录上次随机数值，尽量避避免生产几个一样的随机数 Random rand = new Random(); //采用一个简单的算法以保证生成随机数的不同 for (int i = 1; i < VcodeNum + 1; 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 RndNum(VcodeNum); } temp = t; VNum += VcArray[t]; } return VNum; }}
[解决办法]
参考:
http://www.cnblogs.com/insus/articles/1425377.html