如何获取win7上没显示在任务栏上的图标（隐藏的托盘图标）？

通过下面的代码，可以得到显示在任务栏上的图标，隐藏的图标如何取得？private static IntPtr GetTrayPointer()
        {
            IntPtr h = IntPtr.Zero;
            IntPtr hTemp = IntPtr.Zero;            h = Win32API.FindWindow("Shell_TrayWnd", null); 
            h = Win32API.FindWindowEx(h, IntPtr.Zero, "TrayNotifyWnd", null);
            h = Win32API.FindWindowEx(h, IntPtr.Zero, "SysPager", null);            hTemp = Win32API.FindWindowEx(h, IntPtr.Zero, "ToolbarWindow32", null);            return hTemp; 
        }
        
        public static bool CryptionToolTrayIconIsExisted()
        {
            IntPtr pid = IntPtr.Zero;
            IntPtr lTextAdr = IntPtr.Zero;             IntPtr ipTray = GetTrayPointer();            Win32API.GetWindowThreadProcessId(ipTray, ref pid);
            if (pid.Equals(0)) return false;            IntPtr hProcess = Win32API.OpenProcess(Win32API.PROCESS_ALL_ACCESS | Win32API.PROCESS_VM_OPERATION | Win32API.PROCESS_VM_READ | Win32API.PROCESS_VM_WRITE, IntPtr.Zero, pid);
            IntPtr lAddress = Win32API.VirtualAllocEx(hProcess, 0, 4096, Win32API.MEM_COMMIT, Win32API.PAGE_READWRITE);            // Get the tray icon number
            int lButton = Win32API.SendMessage(ipTray, Win32API.TB_BUTTONCOUNT, 0, 0);            for (int i = 0; i < lButton; i++)
            {
                Win32API.SendMessage(ipTray, Win32API.TB_GETBUTTON, i, lAddress);
                Win32API.ReadProcessMemory(hProcess, (IntPtr)(lAddress.ToInt32() + 16), ref lTextAdr, 4, 0);                if (!lTextAdr.Equals(-1))
                {
                    byte[] buff = new byte[1024];                    Win32API.ReadProcessMemory(hProcess, lTextAdr, buff, 1024, 0);
                    string title = System.Text.ASCIIEncoding.Unicode.GetString(buff);                    int nullindex = title.IndexOf("\0");
                    if (nullindex > 0)
                    {
                        title = title.Substring(0, nullindex);
                    }                    if ("application".Equals(title))
                    {
                        return true;
                    }
                }
            }
            Win32API.VirtualFreeEx(hProcess, lAddress, 4096, Win32API.MEM_RELEASE);
            Win32API.CloseHandle(hProcess);            return false;
        }