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public class User32API

    {

        private static Hashtable processWnd = null;

        public delegate bool WNDENUMPROC(IntPtr hwnd, uint lParam);

        static User32API()

        {

            if (processWnd == null)

            {

                processWnd = new Hashtable();

            }

        }

        [DllImport("user32.dll", EntryPoint = "EnumWindows", SetLastError = true)]

        public static extern bool EnumWindows(WNDENUMPROC lpEnumFunc, uint lParam);

        [DllImport("user32.dll", EntryPoint = "GetParent", SetLastError = true)]

        public static extern IntPtr GetParent(IntPtr hWnd);

        [DllImport("user32.dll", EntryPoint = "GetWindowThreadProcessId")]

        public static extern uint GetWindowThreadProcessId(IntPtr hWnd, ref uint lpdwProcessId);

        [DllImport("user32.dll", EntryPoint = "IsWindow")]

        public static extern bool IsWindow(IntPtr hWnd);

        [DllImport("kernel32.dll", EntryPoint = "SetLastError")]

        public static extern void SetLastError(uint dwErrCode);

        [DllImport("User32.dll", EntryPoint = "SendMessage")]

        private static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);

        Process[] processes;

        const int WM_CLOSE = 0x0010;

        public void GetCurrentWindowHandle()

        {

            Microsoft.Win32.RegistryKey oRegistryKey = Microsoft.Win32.Registry.CurrentUser.OpenSubKey("Software").OpenSubKey("Amada Software");

            string[] subKeys = oRegistryKey.GetSubKeyNames();

            IntPtr ptrWnd = IntPtr.Zero;

            foreach (string subkey in subKeys)

            {

                processes = Process.GetProcessesByName(subkey);

                foreach (Process proc in processes)

                {

                    uint uiPid = (uint)proc.Id;

                    object objWnd = processWnd[uiPid];

                    if (objWnd != null)

                    {

                        ptrWnd = (IntPtr)objWnd;

                        if (ptrWnd != IntPtr.Zero && IsWindow(ptrWnd))

                        {

                            SendMessage(ptrWnd, WM_CLOSE, 0, 0);

                        }

                        else

                        {

                            ptrWnd = IntPtr.Zero;

                        }

                    }

                    bool bResult = EnumWindows(new WNDENUMPROC(EnumWindowsProc), uiPid);

                    if (!bResult && Marshal.GetLastWin32Error() == 0)

                    {

                        objWnd = processWnd[uiPid];

                        if (objWnd != null)

                        {

                            ptrWnd = (IntPtr)objWnd;

                            SendMessage(ptrWnd, WM_CLOSE, 0, 0);

                        }

                    }

                }

            }

        }

        private static bool EnumWindowsProc(IntPtr hwnd, uint lParam)

        {

            uint uiPid = 0;

            if (GetParent(hwnd) == IntPtr.Zero)

            {

                GetWindowThreadProcessId(hwnd, ref uiPid);

                if (uiPid == lParam)

                {

                    processWnd[uiPid] = hwnd;

                    SetLastError(0);

                    return false;

                }

            }

            return true;

        }

    }