Windows CDROM Eject

Question

Does anyone know a method to programmatically close the CD tray on Windows 2000 or higher? Open CD tray exists, but I can't seem to make it close especially under W2k.

I am especially looking for a method to do this from a batch file, if possible, but API calls would be OK.

Answer 1

Nircmd is a very handy freeware command line utility with various options, including opening and closing the CD tray.

Answer 2

I believe this article on code project solves your needs.

Answer 3

Here is an easy way using the Win32 API:

[DllImport("winmm.dll", EntryPoint = "mciSendStringA", CharSet = CharSet.Ansi)]
        protected static extern int mciSendString(string lpstrCommand,StringBuilder lpstrReturnString,int uReturnLength,IntPtr hwndCallback);

 public void OpenCloseCD(bool Open)
 {
    if (Open)
    {
        mciSendString("set cdaudio door open", null, 0, IntPtr.Zero);
    }
    else
    {
        mciSendString("set cdaudio door closed", null, 0, IntPtr.Zero);
    }
}

Answer 4

mciSendString

MCIERROR mciSendString(
  LPCTSTR lpszCommand,  
  LPTSTR lpszReturnString,  
  UINT cchReturn,       
  HANDLE hwndCallback

Answer 5

I kind of like to use DeviceIOControl as it gives me the possibility to eject any kind of removable drive (such as USB and flash-disks as well as CD trays). Da codez to properly eject a disk using DeviceIOControl is (just add proper error-handling):

bool ejectDisk(TCHAR driveLetter)
{
  TCHAR tmp[10];
  _stprintf(tmp, _T("\\\\.\\%c:"), driveLetter);
  HANDLE handle = ::CreateFile(tmp, GENERIC_READ, FILE_SHARE_WRITE, 0, OPEN_EXISTING, 0, 0);
  DWORD bytes = 0;
  DeviceIoControl(handle, FSCTL_LOCK_VOLUME, 0, 0, 0, 0, &bytes, 0);
  DeviceIoControl(handle, FSCTL_DISMOUNT_VOLUME, 0, 0, 0, 0, &bytes, 0);
  DeviceIoControl(handle, IOCTL_STORAGE_EJECT_MEDIA, 0, 0, 0, 0, &bytes, 0);
  CloseHandle(handle);
  return true;
}