獲取進程/主窗口的句柄

通過Process的MainWindowHandle的方式不一定獲取到到句柄，因此我們需要結束Win32的Api來來獲取

Win32的Api中有EnumWindows可以枚舉中所有的窗體，通過繼承id和進程名的方式進行匹配，便可以獲取到指定的進程的主窗體的句柄

具體的代碼如下：

 /// <summary>
        /// 枚舉窗體的回調
        /// </summary>
        /// <param name="hwnd"></param>
        /// <param name="lParam"></param>
        /// <returns></returns>
        public delegate bool EnumWindowsCallBack(IntPtr hwnd, IntPtr lParam);       
/// <summary>
        /// 枚舉出窗體
        /// </summary>
        /// <param name="x"></param>
        /// <param name="y"></param>
        /// <returns></returns>
        [DllImport("user32")]
        public static extern int EnumWindows(EnumWindowsCallBack x, IntPtr y);
 /// <summary>
        /// 獲取窗體的名稱
        /// </summary>
        /// <param name="hWnd"></param>
        /// <param name="lpString"></param>
        /// <param name="nMaxCount"></param>
        /// <returns></returns>
        [DllImport("user32.dll")]
        public static extern int GetWindowTextW(IntPtr hWnd, [MarshalAs(UnmanagedType.LPWStr)] StringBuilder lpString, int nMaxCount);
  [DllImport("User32.dll", CharSet = CharSet.Auto)]
        public static extern int GetWindowThreadProcessId(IntPtr hwnd, out int ID);
/// <summary>
        /// 枚舉方式獲取句柄
        /// </summary>
        /// <param name="process"></param>
        public static IntPtr EnumWindows(Process process)
        {
            IntPtr msgPtr = Marshal.StringToHGlobalAnsi(_processName + "^" + process.Id);
            IntPtr  handle=IntPtr.Zero;
            EnumWindows(new EnumWindowsCallBack((hwnd, lpam) =>
            {
                var msgs = (Marshal.PtrToStringAnsi(lpam)).Split('^');
                if (msgs.Length < 2) return false;//停止枚舉
                string msg = msgs[0];
                var lpid = int.Parse(msgs[1]);
                StringBuilder sb = new StringBuilder(256);
                GetWindowTextW(hwnd, sb, sb.Capacity);
                GetWindowThreadProcessId(hwnd, out int pid);
                if (sb != null && sb.ToString().Equals(msg) && pid == lpid)
                {
                    handle= hwnd;
                    return false; //停止枚舉
                }

                return true;//繼續枚舉
            }), msgPtr);
return handle;
        }

　　通過以上的方式，便可以獲取我們想要的進程的主窗體句柄了