.net 验证码

来源：互联网发布：单片机校验位计算编辑：程序博客网时间：2024/06/04 19:16

private void CreateImage(string checkCode)
    {
        int iwidth = (int)(checkCode.Length * 20);
        System.Drawing.Bitmap image = new System.Drawing.Bitmap(iwidth, 25);
        Graphics g = Graphics.FromImage(image);
        Font f = new System.Drawing.Font("Arial", 10, System.Drawing.FontStyle.Bold);
        Brush b = new System.Drawing.SolidBrush(Color.White);
        //g.FillRectangle(new System.Drawing.SolidBrush(Color.Blue),0,0,image.Width, image.Height);
        g.Clear(Color.Black);
        g.DrawString(checkCode, f, b, 3, 3);
        Pen blackPen = new Pen(Color.Black, 0);
        Random rand = new Random();
        //for (int i=0;i<5;i++)
        //{
        //    int y = rand.Next(image.Height);
        //    g.DrawLine(blackPen,0,y,image.Width,y);
        //}
        System.IO.MemoryStream ms = new System.IO.MemoryStream();
        image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
        Response.ClearContent();
        Response.ContentType = "image/Jpeg";
        Response.BinaryWrite(ms.ToArray());
        g.Dispose();
        image.Dispose();
    }

0 0