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;// 宽
private static int height = 121;// 高
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)];// 码
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";
}
}
}
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();
}
}
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>
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
时间： 2024-10-04 17:51:47