SetWindowLong,SetWindowLongPtr,GetWindowLong,GetWindowLongPtr

public static IntPtr SetWindowLong(IntPtr hWnd, int nIndex, IntPtr dwNewLong)
        {
            if (IntPtr.Size == 4)
            {
                return SetWindowLongPtr32(hWnd, nIndex, dwNewLong);
            }
            return SetWindowLongPtr64(hWnd, nIndex, dwNewLong);
        }

        [DllImport("user32.dll", EntryPoint = "SetWindowLong", CharSet = CharSet.Auto)]
        public static extern IntPtr SetWindowLongPtr32(IntPtr hWnd, int nIndex, IntPtr dwNewLong);

        [DllImport("user32.dll", EntryPoint = "SetWindowLongPtr", CharSet = CharSet.Auto)]
        public static extern IntPtr SetWindowLongPtr64(IntPtr hWnd, int nIndex, IntPtr dwNewLong);



        public static IntPtr GetWindowLong(IntPtr hWnd, int nIndex)
        {
            if (IntPtr.Size == 4)
            {
                return GetWindowLong32(hWnd, nIndex);
            }
            return GetWindowLongPtr64(hWnd, nIndex);
        }


        [DllImport("user32.dll", EntryPoint = "GetWindowLong", CharSet = CharSet.Auto)]
        private static extern IntPtr GetWindowLong32(IntPtr hWnd, int nIndex);

        [DllImport("user32.dll", EntryPoint = "GetWindowLongPtr", CharSet = CharSet.Auto)]
        private static extern IntPtr GetWindowLongPtr64(IntPtr hWnd, int nIndex);


        private const int GWL_STYLE = -16;

        // 右上角 X 按鈕
        private const int WS_SYSMENU = 0x00080000;

        // 右上角 最小化、最大化 按鈕
        private const int MaximizeIcon = 0x10000;
        private const int MinimizeIcon = 0x20000;
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                IntPtr hWndRUT_Host = FindWindowByCaption(IntPtr.Zero, strRUT_Host);

                #region 移除 視窗 右上角 X 按鈕
                IntPtr style = GetWindowLong(hWndRUT_Host, GWL_STYLE);


                long tempStyle = (long)style.ToInt32() & ~WS_SYSMENU;

                SetWindowLong(hWndRUT_Host, GWL_STYLE, new IntPtr(tempStyle));


                textBox1.Text += "移除 視窗 右上角 X 按鈕" + Environment.NewLine;
                #endregion