Attempting to open CD tray

Question

I'm trying to open and close the CD tray of my computer using a piece of code. I have been using MCI commands and have included winmm.lib in the additional dependencies of my project configuration. I've included windows.h and mmsystem.h as well.

The code I'm using is as follows:

mciSendCommand(0, MCI_SET, MCI_SET_DOOR_OPEN, NULL);
mciSendCommand(1, MCI_SET, MCI_SET_DOOR_CLOSED, NULL);

The code builds and runs fine, there's just no CD tray action going on! Can anyone suggest how I need to adapt this?

Answer 1

If you have multiple CD-Drives you should use the following code:

#include <windows.h>  
#include <tchar.h>  
#include <stdio.h>  

int _tmain() 
{ 
   DWORD dwBytes; 
   HANDLE hCdRom = CreateFile(_T("\\\\.\\M:"), GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL); 
   if (hCdRom == INVALID_HANDLE_VALUE) 
   { 
     _tprintf(_T("Error: %x"), GetLastError()); 
     return 1; 
   } 

   // Open the door:  
   DeviceIoControl(hCdRom, IOCTL_STORAGE_EJECT_MEDIA, NULL, 0, NULL, 0, &dwBytes, NULL); 

   Sleep(1000); 

   // Close the door:  
   DeviceIoControl(hCdRom, IOCTL_STORAGE_LOAD_MEDIA, NULL, 0, NULL, 0, &dwBytes, NULL); 

   CloseHandle(hCdRom); 
} 

Answer 2

You are missing some steps, first you need to open the device.

Try this:

#pragma comment( lib, "winmm.lib" )

#include "stdafx.h"
#include <Windows.h>
#include <mmsystem.h>


int _tmain()
{

    MCI_OPEN_PARMS mPar = { 0 };
    mPar.lpstrDeviceType = reinterpret_cast<LPCWSTR>(MCI_DEVTYPE_CD_AUDIO);

    // Open device
    mciSendCommand(0, MCI_OPEN, MCI_OPEN_TYPE | MCI_OPEN_TYPE_ID, (DWORD)&mPar);

    // Open tray
    mciSendCommand(mPar.wDeviceID, MCI_SET, MCI_SET_DOOR_OPEN, 0);

    // Close tray
    mciSendCommand(mPar.wDeviceID, MCI_SET, MCI_SET_DOOR_CLOSED, 0);

    // Close device
    mciSendCommand(mPar.wDeviceID, MCI_CLOSE, MCI_WAIT, 0);

    return 0;
}