第491篇-Get the window position on the screen-优快云博客

本文介绍了一种使用C#编程语言获取当前活动窗口在屏幕上的位置和尺寸的方法。通过调用GetForegroundWindow()和GetWindowRect()函数，可以精确地获取窗口的左上角坐标以及宽度和高度。

Sometimes, we need to get the current positon of the window on the screen, you can just invoke the following methods to achieve that purpose.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
namespace WindowsFormRect
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        /// <summary>
        /// Get the current window's position compared to the screen.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnPosition_Click(object sender, EventArgs e)
        {
            var awin = GetForegroundWindow(); //获取当前窗口句柄
            RECT rc = new RECT();
            GetWindowRect(awin, ref rc);
            int width = rc.Right - rc.Left; //窗口的宽度
            int height = rc.Bottom - rc.Top; //窗口的高度
            int x = rc.Left;
            int y = rc.Top;
            // show position
            richTextBox1.Text += string.Format("Bottom:{0},Left {1}, Top {2}, Right {3} {4}",rc.Bottom,rc.Left,rc.Top,rc.Right,System.Environment.NewLine);
        }

        // 获取当前窗口句柄:GetForegroundWindow()
        [DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
        public static extern IntPtr GetForegroundWindow();

        //返回值类型是IntPtr,即为当前获得焦点窗口的句柄
        //获取到该窗口句柄后,可以对该窗口进行操作.比如,关闭该窗口或在该窗口隐藏后,使其显示
        /// <summary>
        /// nCmdShow的含义
        //0 关闭窗口
        //1 正常大小显示窗口
        //2 最小化窗口
        //3 最大化窗口
        /// </summary>
        /// <param name="hwnd"></param>
        /// <param name="nCmdShow"></param>
        /// <returns></returns>
        [DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
        public static extern int ShowWindow(IntPtr hwnd, int nCmdShow);
        // 获取窗口大小及位置:需要调用方法GetWindowRect(IntPtr hWnd, ref RECT lpRect)

        [DllImport("user32.dll")]
        [return: MarshalAs(UnmanagedType.Bool)]
        static extern bool GetWindowRect(IntPtr hWnd, ref RECT lpRect);
    }

    [StructLayout(LayoutKind.Sequential)]
    public struct RECT
    {
        public int Left; //最左坐标
        public int Top; //最上坐标
        public int Right; //最右坐标
        public int Bottom; //最下坐标
    }
}