WPF获取鼠标相对于屏幕的绝对位置

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最近在看《深入浅出WPF》，在做练习的时候自己做了一下扩展，在此记下：

XAML代码：

<Window x:Class="TestCanvas.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="登录" Height="110px" Width="300px" WindowStartupLocation="CenterScreen" WindowStyle="None" 
        MaxHeight="110px" MaxWidth="300px" MinHeight="110px" MinWidth="300px" MouseDown="Mouse_downHandler"> 
    <Canvas>
        <TextBlock Text="用户名：" Canvas.Left="12px" Canvas.Top="12px"/>
        <TextBox x:Name="tbUserName"  Height="23px" Width="200px" BorderBrush="Black" Canvas.Left="66px" Canvas.Top="9px"/>
        <TextBlock Text="密码：" Canvas.Left="12px" Canvas.Top="40.72px" Height="16px" Width="36px"/>
        <TextBox x:Name="tbPasword"  Height="23px" Width="200px" BorderBrush="Black" Canvas.Left="66px" Canvas.Top="38px"/>
        <Button Content="登录" Width="80px" Height="23px" Canvas.Left="66" Canvas.Top="67px"/>
        <Button Content="退出" Width="80px" Height="23px" Canvas.Left="186" Canvas.Top="67px" Click="Close_clickHandler"/>
    </Canvas>
</Window>

CSharp代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
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;

namespace TestCanvas
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        [StructLayout(LayoutKind.Sequential)]
        public struct POINT
        {
            public int X;
            public int Y;

            public POINT(int x, int y)
            {
                this.X = x;
                this.Y = y;
            }
        }

        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        public static extern bool GetCursorPos(out POINT pt);

        public MainWindow()
        {
            InitializeComponent();
        }

        public void Close_clickHandler(Object sender, RoutedEventArgs e)
        {
            this.Close();
        }

        private void Mouse_downHandler(object sender, MouseButtonEventArgs e)
        {
            Point p = e.MouseDevice.GetPosition(this);  //获取鼠标相对位置

            MainWindow.POINT pit = new MainWindow.POINT();
            MainWindow.GetCursorPos(out pit);   //获取鼠标绝对位置

            StringBuilder sbRel = new StringBuilder();
            sbRel.Append("相对位置：(");
            sbRel.Append(p.X);
            sbRel.Append(",");
            sbRel.Append(p.Y);
            sbRel.Append(")");
            tbUserName.Text = sbRel.ToString();

            StringBuilder sbAbs = new StringBuilder();
            sbAbs.Append("绝对位置：(");
            sbAbs.Append(pit.X);
            sbAbs.Append(",");
            sbAbs.Append(pit.Y);
            sbAbs.Append(")");
            tbPasword.Text = sbAbs.ToString();
        }
    }
}