How to Implement the switch CD-ROM

How to Implement the switch CD-ROM
The operation on the CD-ROM can be implemented through the mcisendcommand function.

The following is implemented using VC. Code :

// Device ID
DWORD wdevid;
// Enable device parameters
Mci_open_parms mciom;

// Set the device name to cd_rom
Mciom. lpstrdevicetype = "cdaudio ";
// Open this device
If (mcisendcommand (0, mci_open, mci_open_type, (DWORD) (lpvoid) & mciom ))
{
Return;
}
// Obtain the device ID
Wdevid = mciom. wdeviceid;
// Open CD-ROM
Mci_set_parms mciset;
If (mcisendcommand (wdevid, mci_set, mci_set_door_open | mci_set_off, (DWORD) (lpstr) & mciset ))
{

}
// Close CD-ROM
If (mcisendcommand (wdevid, mci_set, mci_set_door_closed | mci_set_off, (DWORD) (lpstr) & mciset ))
{

}
// Close the device
Mcisendcommand (wdevid, mci_close, 0, 0 );