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点击式验证码

看到网上的点击式验证码,觉得很方便.

环境 W8.1 VS2013 .NET4.5 WPF

验证码类 CreateValidateImg 主要包含生成验证图片的方法,和比较验证码的方法

/// <summary>    /// 生成验证码图片    /// 随机的验证码包含0-9十个数字和A-Z 26个字母(ascii65-90)    /// </summary>    internal class CreateValidateImg    {        private static string codesource = "QAZXSWEDCVFRTGBNHYUJMKIOLP0123456789";// 随机源        private static Random rand = new Random();// 随机工具        private static Dictionary<Point, string> pointdic = null;// 坐标系(键)所在验证码(值)        private static string codestr = null;// 验证码        private static int width = 201;//        private static int height = 121;//        internal static MemoryStream ms = null;// 保存验证码选择图片的流        public static MemoryStream mscode = null;// 保存验证码图片的流                /// <summary>        /// 画出验证码图片,        /// </summary>        /// <returns></returns>        internal static void ValidateImg()        {            /*创建验证码选择图片*/            Bitmap vpic = new Bitmap(width, height);// 创建一个图片 用于验证码选择            Graphics g = Graphics.FromImage(vpic);// 根据这个图片创建绘画工具            // 开始绘画            g.FillRectangle(Brushes.Gold, 0, 0, width, height);// 填充一个颜色            // 1.画一个3行4列的网格,均分160长 60高            for (int i = 0; i < 4; i++)            {                g.DrawLine(Pens.Blue, new Point(0, i * 40), new Point(width, i * 40));            }            for (int i = 0; i < 5; i++)            {                g.DrawLine(Pens.Blue, new Point(i * 50, 0), new Point(i * 50,width));            }            // 2.画12个字符            pointdic = new Dictionary<Point, string>(12);// 初始化坐标系的值            for (int i = 0; i < 3; i++)            {                for (int j = 0; j < 4; j++)                {                    char a = codesource[rand.Next(0, 36)];//                    g.DrawString(a.ToString(), new Font("Anonymous Pro", 15,FontStyle.Bold), Brushes.Black,                        new Point(j * 50 + 16, i * 40 + 10));// 画画                    pointdic.Add(new Point(j,i), a.ToString());// 坐标 码 键值对                }            }            // 创建内存流,将图片保存在其中            ms = new MemoryStream();            vpic.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);            // 让内存流回到开头的位置            ms.Seek(0, SeekOrigin.Begin);            /********再创建验证码图片********/            Bitmap vimg = new Bitmap(200,30);            g = Graphics.FromImage(vimg);            g.FillRectangle(Brushes.Orange, 0, 0, 200, 30);            // 从字典中随机5个验证码字符            string[] vcodearray = pointdic.Values.ToArray<string>();            codestr = "";            for (int i = 0; i < 5; i++)            {                string vc = vcodearray[rand.Next(0, 12)];                g.DrawString(vc, new Font("Anonymous Pro", 15, FontStyle.Bold), Brushes.Black,                        new Point(i*30+30,5));// 画画                codestr = codestr + vc;            }            mscode = new MemoryStream();            vimg.Save(mscode, System.Drawing.Imaging.ImageFormat.Jpeg);            mscode.Seek(0, SeekOrigin.Begin);        }        /// <summary>        /// 画出验证码图片中被点击的部分        /// </summary>        /// <param name="newxy"></param>        /// <returns></returns>        internal static MemoryStream ValidateImgPartial(int x,int y)        {            // 当前的验证码图片 从流中读出来            Bitmap bmp = new Bitmap(ms);            // 将点击指定的部分复制出来            Bitmap pbmp = bmp.Clone(new Rectangle(x * 50, y * 40, 51, 41), System.Drawing.Imaging.PixelFormat.Format24bppRgb);            // 返回图片数据            MemoryStream pms = new MemoryStream();            pbmp.Save(pms, System.Drawing.Imaging.ImageFormat.Jpeg);            pms.Seek(0, SeekOrigin.Begin);            return pms;        }        /// <summary>        /// 根据坐标键获取单个验证码        /// </summary>        /// <param name="xy"></param>        internal static string GetCodeByPoint(int x ,int y)        {            Point xy = new Point(x, y);            if(pointdic.ContainsKey(xy))            {                string c=pointdic[xy];                return c;            }            return "no code are finded";        }        /// <summary>        /// 根据坐标数组比较验证码正确性        /// </summary>        /// <param name="point"></param>        /// <returns></returns>        internal static string ToValidate(Point[] point)        {            StringBuilder sb = new StringBuilder();            foreach (Point item in point)            {                if (pointdic.ContainsKey(item))                {                    sb.Append(pointdic[item]);                }                else                {                    return "验证码有误";                }            }            if (string.Compare(codestr, sb.ToString(), true)==0)            {                return "验证码正确";            }            else            {                return "验证码有误";            }        }    }
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WPF窗体 包含一个验证码图片框 ,一个验证码选择图片框,点击时存放所点击的验证码图片的框(共有5个)

/// <summary>    /// VImage.xaml 的交互逻辑    /// </summary>    public partial class VImage : Window    {        public VImage()        {            InitializeComponent();        }        private List<System.Drawing.Point> pointlist = new List<System.Drawing.Point>();// 收集每次点击的坐标,在重置按钮时会被清空        private void Window_Loaded(object sender, RoutedEventArgs e)        {            InItValidateImage();        }        private void InItValidateImage()        {            // 1。验证码图片            BitmapImage big = new BitmapImage();            big.BeginInit();// 初始化开始            CreateValidateImg.ValidateImg();            big.StreamSource = CreateValidateImg.mscode;// 图片源来自这个流            big.EndInit();// 初始化完成             imgcode.Source = big;// 设为IMAGE控件的源            // 2。验证码选框图片            big = new BitmapImage();// 用于IMAGE控件的图像源            big.BeginInit();// 初始化开始            big.StreamSource = CreateValidateImg.ms;// 图片源来自这个流            big.EndInit();// 初始化完成             imgbox.Source = big;// 设为IMAGE控件的源        }        private void imgbox_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)        {            Point xy = e.GetPosition(imgbox);            //MessageBox.Show((int)xy.X / 50 + "   " + (int)xy.Y / 40);            Image[] img5 = new Image[] { vimg1, vimg2, vimg3, vimg4, vimg5 };            for (int i = 0; i < img5.Length; i++)            {                if (img5[i].Source == null)                {                    BitmapImage big = new BitmapImage();                    big.BeginInit();                    big.StreamSource=CreateValidateImg.ValidateImgPartial((int)xy.X / 50,(int)xy.Y / 40);                    big.EndInit();                    img5[i].Source = big;                    //MessageBox.Show(CreateImg.GetCodeByPoint((int)xy.X / 50, (int)xy.Y / 40) + "  " + (int)xy.X / 50 + "   " + (int)xy.Y / 40);                    this.pointlist.Add(new System.Drawing.Point((int)xy.X / 50, (int)xy.Y / 40));// 加入到坐标集合                    if (i != img5.Length-1)                        break;                    // 比对验证码.当点完最后一个时才会验证                    // 1.收集所有点击过的坐标(目前是放在本窗口定义的一个成员内)                    isvalidatelbl.Content = CreateValidateImg.ToValidate(this.pointlist.ToArray());                }            }        }        // 重置        private void Button_Click(object sender, RoutedEventArgs e)        {            // 清空图片            Image[] img5 = new Image[] { vimg1, vimg2, vimg3, vimg4, vimg5 };            foreach (Image item in img5)            {                item.Source = null;            }            // 清空坐标列表            this.pointlist = new List<System.Drawing.Point>();            // 清空验证结果信息            isvalidatelbl.Content = "请选择验证码";            // 更换验证码            this.InItValidateImage();        }            }
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WPF窗体XAML

<Window x:Class="WpfApplication1.VImage"        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"        Title="VImage" Height="400" Width="300" Loaded="Window_Loaded" WindowStartupLocation="CenterOwner">    <Grid>        <Image x:Name="imgbox" HorizontalAlignment="Left" Height="121" Margin="52,79,0,0" VerticalAlignment="Top" Width="201" MouseLeftButtonUp="imgbox_MouseLeftButtonUp"/>        <WrapPanel x:Name="wpl1" Height="45" Margin="0,214,0,0" VerticalAlignment="Top">            <Image x:Name="vimg1" Height="41" Width="51" RenderTransformOrigin="0.5,0.5" VerticalAlignment="Top" HorizontalAlignment="Left"/>            <Image x:Name="vimg2" Height="41" Width="51" OpacityMask="#FFDE4A4A" RenderTransformOrigin="0.5,0.5" VerticalAlignment="Top" HorizontalAlignment="Left"/>            <Image x:Name="vimg3" Height="41" Width="51" OpacityMask="#FFDE4A4A" RenderTransformOrigin="0.5,0.5" VerticalAlignment="Top" HorizontalAlignment="Left"/>            <Image x:Name="vimg4" Height="41" OpacityMask="#FFDE4A4A" Width="51" RenderTransformOrigin="0.5,0.5" VerticalAlignment="Top" HorizontalAlignment="Left"/>            <Image x:Name="vimg5" Height="41" Width="51" RenderTransformOrigin="0.5,0.5" OpacityMask="#FFDE4A4A" VerticalAlignment="Top" HorizontalAlignment="Left"/>        </WrapPanel>        <Button Content="reset" HorizontalAlignment="Left" Height="22" Margin="106,322,0,0" VerticalAlignment="Top" Width="68" Click="Button_Click" RenderTransformOrigin="2.088,0.727"/>        <Image x:Name="imgcode" HorizontalAlignment="Left" Height="31" Margin="65,43,0,0" VerticalAlignment="Top" Width="148" RenderTransformOrigin="0.574,0.774"/>        <Label Content="请在表格中点击输入验证码" HorizontalAlignment="Left" Height="28" Margin="25,10,0,0" VerticalAlignment="Top" Width="187"/>        <Label x:Name="isvalidatelbl" Content="请点击图片选择验证码" VerticalAlignment="Top" Margin="0,275,0,0" HorizontalContentAlignment="Center" Foreground="#FF8D2121" FontWeight="Bold"/>    </Grid></Window>
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大体实现思路:

1.画出两个图片,一张是包含验证码的图片(小图),一张是包含验证码和其它字符的图片(大图),在这图上点击选择验证码,这两个图的生成是同时的,成对的.

2.将两张图片保存为流,并且设为Image控件的Source值.这个方法见http://www.cnblogs.com/pilang/archive/2010/05/30/1747485.html

3.点选时,得到坐标.就是那个3行4列表格里的数字的左上角坐标,如上图中的X坐标是(2,1).当点击选择时,通过获取点击的坐标计算所点字符的相对坐标,如点击X所在的方格时,会得到此时鼠标的坐标值(须以当前图片做为参照元素),将X/50,Y/40就得到X(2,1)的相对坐标.50,40指X所在方格的长宽.

4.将上面得到的坐标还原成实际方格所在坐标,就是再乘以相应的长和宽.到原图中复制出以此坐标为起点,长和宽的值为大小构造的矩形区域.实际就是那个被点的字符块.复制后设为下面的小格中的Image的source值

5.对比验证码,收集每次点击的坐标,在后台字典中(坐标和验证码字符的键值对)找出这些值,然后比较字符即可

其它 :坐标计算 图片部分复制 WPF控件的用法和winform差别很大,以前的办法都不好使了

点击式验证码