CD_ROM打开关闭

[DllImport("winmm.dll", EntryPoint = "mciSendString")]
        public static extern int mciSendString(string lpstrCommand, string lpstrReturnString, System.UInt16 uReturnLength, System.IntPtr HwndCallback);
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }
        private void button打开_Click(object sender, EventArgs e)
        {
            int i = mciSendString("Set cdaudio door open wait", "", 0, this.Handle);
          
            if (i == 0)
            {
                MessageBox.Show("CD_ROM已打开");
            }
        }

        private void button关闭_Click(object sender, EventArgs e)
        {
            int i = mciSendString("Set cdaudio door Closed wait", "", 0, this.Handle);
            if (i == 0)
            {
                MessageBox.Show("CD_ROM已关闭");
            }
        }