Open or Close a CD/DVD Drive Drawer

// OpenCloseCDDlg.cpp : implementation file
//

#include "stdafx.h"
#include "OpenCloseCD.h"
#include "OpenCloseCDDlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif


// CAboutDlg dialog used for App About

class CAboutDlg : public CDialog
{
public:
	CAboutDlg();

// Dialog Data
	enum { IDD = IDD_ABOUTBOX };

	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support

// Implementation
protected:
	DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
END_MESSAGE_MAP()


// COpenCloseCDDlg dialog




COpenCloseCDDlg::COpenCloseCDDlg(CWnd* pParent /*=NULL*/)
	: CDialog(COpenCloseCDDlg::IDD, pParent)
{
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void COpenCloseCDDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	DDX_Control(pDX, IDC_DRIVELIST, m_cDriveList);
}

BEGIN_MESSAGE_MAP(COpenCloseCDDlg, CDialog)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	//}}AFX_MSG_MAP
	ON_BN_CLICKED(IDC_OPEN, &COpenCloseCDDlg::OnBnClickedOpen)
	ON_BN_CLICKED(IDC_CLOSE, &COpenCloseCDDlg::OnBnClickedClose)
	ON_CBN_SELCHANGE(IDC_DRIVELIST, &COpenCloseCDDlg::OnCbnSelchangeDrivelist)
END_MESSAGE_MAP()


// COpenCloseCDDlg message handlers

BOOL COpenCloseCDDlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	// Add "About..." menu item to system menu.

	// IDM_ABOUTBOX must be in the system command range.
	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
	ASSERT(IDM_ABOUTBOX < 0xF000);

	CMenu* pSysMenu = GetSystemMenu(FALSE);
	if (pSysMenu != NULL)
	{
		CString strAboutMenu;
		strAboutMenu.LoadString(IDS_ABOUTBOX);
		if (!strAboutMenu.IsEmpty()) {
			pSysMenu->AppendMenu(MF_SEPARATOR);
			pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
		}
	}

	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon

	// Fill the combo box with CDROM type drives.
	PopulateDriveList();
	return TRUE;  // return TRUE  unless you set the focus to a control
}

void COpenCloseCDDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
	if ((nID & 0xFFF0) == IDM_ABOUTBOX) {
		CAboutDlg dlgAbout;
		dlgAbout.DoModal();
	}
	else
	{
		CDialog::OnSysCommand(nID, lParam);
	}
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void COpenCloseCDDlg::OnPaint()
{
	if (IsIconic()) {
		CPaintDC dc(this); // device context for painting

		SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);

		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;

		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
		CDialog::OnPaint();
}

// The system calls this function to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR COpenCloseCDDlg::OnQueryDragIcon()
{
	return static_cast<HCURSOR>(m_hIcon);
}

// Opens or closes the CD or DVD drive specified in drive letter.
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;
}

bool COpenCloseCDDlg::PopulateDriveList()
{
	m_cDriveList.ResetContent();

	TCHAR szDriveRoot[] = _T("x:\\");
	TCHAR cDrive;
	UINT nDriveType;
	UINT nFlags = SHGFI_DISPLAYNAME;

	DWORD nSystemDrives = GetLogicalDrives();

    // Let the use know if they don't have any drives.
	ASSERT(nSystemDrives != 0);

	// Loop through all the drives and look for CD-ROM
	for(cDrive = 'A'; cDrive <= 'Z'; cDrive++, nSystemDrives >>= 1) {
        if(!(nSystemDrives & 1))
            continue;

		// See if this is one of the drives we're looking for and add it to the combo.
		szDriveRoot[0] = cDrive;
		nDriveType = GetDriveType(szDriveRoot);

		if(nDriveType == DRIVE_CDROM) {
			// Looks like "CD Drive (D:)"
			CString cs;
			cs.Format(_T("CD/DVD ROM Drive (%c:)"),szDriveRoot[0]);
			m_cDriveList.AddString(cs);
			// Store away the drive letter so we can retrieve it later if the user
			// selects this drive.
			m_cDriveList.SetItemData(m_cDriveList.GetCount()-1,szDriveRoot[0]);
        }
	}

	// Did we add any entries?  If not, flag that we have
	// no usable drives.
	if(m_cDriveList.GetCount() >= 1) {
		m_cDriveList.SetCurSel(0);
		m_cCurrentDrive = (TCHAR)m_cDriveList.GetItemData(0);
	}
	else
		return false;
	return true;
}

void COpenCloseCDDlg::OnBnClickedOpen()
{
	CWaitCursor wc;
	OpenCloseTray(true,m_cCurrentDrive);
}

void COpenCloseCDDlg::OnBnClickedClose()
{
	CWaitCursor wc;
	OpenCloseTray(false,m_cCurrentDrive);
}

void COpenCloseCDDlg::OnCbnSelchangeDrivelist()
{
	m_cCurrentDrive = (TCHAR)m_cDriveList.GetItemData(m_cDriveList.GetCurSel());
}