MainWindow.xaml.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using Timer = System.Timers.Timer;

namespace WpfApp1
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public bool IsGetImage = false;

        public readonly ImageInfo ImageInfo = new ImageInfo();

        public MainWindow()
        {
            InitializeComponent();
            DataContext = ImageInfo;
        }
        [DllImport("user32.dll")]
        static extern IntPtr GetDC(IntPtr hwnd);

        [DllImport("user32.dll")]
        static extern Int32 ReleaseDC(IntPtr hwnd, IntPtr hdc);

        [DllImport("gdi32.dll")]
        static extern uint GetPixel(IntPtr hdc, int nXPos, int nYPos);
        /// <summary>   
        /// 获取鼠标的坐标   
        /// </summary>   
        /// <param name="lpPoint">传址参数，坐标point类型</param>   
        /// <returns>获取成功返回真</returns>   
        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        public static extern bool GetCursorPos(out POINT pt);

        [DllImport("user32.dll", EntryPoint = "GetDesktopWindow")]
        public static extern IntPtr GetDesktopWindow();

        public Timer timer;

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            IsGetImage = !IsGetImage;

             timer = new Timer()