C#.Net 擷取特定應用畫面

最近想說玩手遊順便寫外掛來洗市場
第一步當然就是擷取畫面

執行結果：

程式碼：

using System;
using System.Diagnostics;
using System.Drawing;
using System.Drawing.Imaging;
using System.Runtime.InteropServices;
using System.Threading;
using System.Windows.Forms;

namespace Test
{
    public partial class Form1 : Form
    {
        /// <summary>
        /// 範圍
        /// </summary>
        [StructLayout(LayoutKind.Sequential)]
        public struct Rect
        {
            public int Left;
            public int Top;
            public int Right;
            public int Bottom;
        }

        /// <summary>
        /// 取得應用程式畫面
        /// </summary>
        /// <param name="hWnd">程序</param>
        /// <param name="bounds">範圍</param>
        /// <returns></returns>
        [DllImport("user32.dll")]
        public static extern Boolean GetWindowRect(IntPtr hWnd, ref Rect rect);

        /// <summary>
        /// 將程式至於前景
        /// </summary>
        /// <param name="hWnd">程序</param>
        /// <returns></returns>
        [DllImport("user32.dll")]
        private static extern int SetForegroundWindow(IntPtr hWnd);

        /// <summary>
        /// 顯示視窗
        /// </summary>
        /// <param name="hWnd">程序</param>
        /// <param name="nCmdShow">命令</param>
        /// <returns></returns>
        [DllImport("user32.dll")]
        private static extern IntPtr ShowWindow(IntPtr hWnd, int nCmdShow);

        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            var process = Process.GetProcessesByName("player");
            foreach (var p in process)
            {
                SetForegroundWindow(p.MainWindowHandle);
                ShowWindow(p.MainWindowHandle, 1);
                Thread.Sleep(500);
                Rect rect = new Rect();
                GetWindowRect(p.MainWindowHandle, ref rect);

                int width = rect.Right - rect.Left;
                int height = rect.Bottom - rect.Top;
                Bitmap bmp = new Bitmap(width, height, PixelFormat.Format32bppArgb);
                Graphics.FromImage(bmp).CopyFromScreen(rect.Left,
                                                       rect.Top,
                                                       0,
                                                       0,
                                                       new Size(width, height),
                                                       CopyPixelOperation.SourceCopy);
                string path = DateTime.Now.ToString("yyyyMMdd HHmmss") + ".jpg";
                bmp.Save(path);
            }
        }

    }
}