简单验证码

来源：互联网发布：淘宝卖家数据采集软件编辑：程序博客网时间：2024/05/11 03:29

嘿嘿长跟给我的，自己要努力学习一下了呵呵

private string validata()
    {
        Bitmap objBitMap = new Bitmap(60, 40);
        Graphics objGraphics;
        objGraphics = Graphics.FromImage(objBitMap);
        objGraphics.Clear(Color.Teal);

        Random k = new Random();
        string Vchar = "0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p" +",q,r,s,t,u,v,w,x,y,z";
        string[] Vstr = Vchar.Split(",".ToCharArray());
        int n1 = k.Next(0, 35);
        int n2 = k.Next(0, 35);
        int n3 = k.Next(0, 35);
        int n4 = k.Next(0, 35);

        string str1 = Vstr[n1].ToString();
        string str2 = Vstr[n2].ToString();
        string str3 = Vstr[n3].ToString();
        string str4 = Vstr[n4].ToString();

        string str = str1 + str2 + str3 + str4;
        objGraphics.DrawString(str, new Font("宋体", 14), Brushes.Red, new PointF(5, 5));
        string strAbsolutePath = (Server.MapPath(".")) + "//instructMap.gif";
        objBitMap.Save(strAbsolutePath);
        return str;
    }