bool COpenCloseCDDlg::OpenCloseTray(bool bOpen, TCHAR cDrive)
{
    // Open the device (drive) that we want to affect

    CString cs;
    cs.Format(_T("\\\\.\\%c:"),cDrive);
    HANDLE hDrive = CreateFile(cs, GENERIC_READ, FILE_SHARE_READ, 
                               NULL, OPEN_EXISTING, 
    FILE_ATTRIBUTE_NORMAL, NULL);

    // Make sure the device was found and opened successfully

    if(hDrive == INVALID_HANDLE_VALUE || GetLastError() != NO_ERROR)
        return false;

    BOOL bStatus; // Let the caller know if it worked or not

    DWORD dwDummy; // We don't really need this info

    if(bOpen) // Open the tray

        bStatus = DeviceIoControl(hDrive, IOCTL_STORAGE_EJECT_MEDIA, NULL, 
                                  0, NULL, 0, &dwDummy, NULL);
    else // Close the tray

        bStatus = DeviceIoControl(hDrive, IOCTL_STORAGE_LOAD_MEDIA, 
                                  NULL, 0, NULL, 0, &dwDummy, NULL);
    CloseHandle(hDrive);
    return bStatus?true:false;
}
Hi you can go through this link to open and close the rom:
http://www.codeproject.com/KB/system/Open_Close_CD_DVD_Drawer.aspx