discdromandfddlg.cpp

这个是怎么判别并定位到光驱（软驱）的源码

// DisCdromAndFdDlg.cpp : implementation file
//

#include "stdafx.h"
#include "DisCdromAndFd.h"
#include "DisCdromAndFdDlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About

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

// Dialog Data
	//{{AFX_DATA(CAboutDlg)
	enum { IDD = IDD_ABOUTBOX };
	//}}AFX_DATA

	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CAboutDlg)
	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
	//}}AFX_VIRTUAL

// Implementation
protected:
	//{{AFX_MSG(CAboutDlg)
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
};

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

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

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
	//{{AFX_MSG_MAP(CAboutDlg)
		// No message handlers
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CDisCdromAndFdDlg dialog

CDisCdromAndFdDlg::CDisCdromAndFdDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CDisCdromAndFdDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CDisCdromAndFdDlg)
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CDisCdromAndFdDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CDisCdromAndFdDlg)
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CDisCdromAndFdDlg, CDialog)
	//{{AFX_MSG_MAP(CDisCdromAndFdDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_CBN_SELCHANGE(IDC_DRIVER, OnSelchangeDriver)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CDisCdromAndFdDlg message handlers

BOOL CDisCdromAndFdDlg::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
	
	// TODO: Add extra initialization here
	//获得所有驱动器
	FindAllDrivers();
	return TRUE;  // return TRUE  unless you set the focus to a control
}

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

		SendMessage(WM_ICONERASEBKGND, (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 to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CDisCdromAndFdDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

//找到所有的驱动器，并在列表框中显示
void CDisCdromAndFdDlg::FindAllDrivers()
{
	arrDrvItems.RemoveAll();
	CComboBox* Driver=(CComboBox*)GetDlgItem(IDC_DRIVER);
	DWORD dwNumBytesForDriveStrings;//实际存储驱动器号的字符串长度
	HANDLE hHeap;
	LPSTR lp;
	CString strLogdrive;

	//获得实际存储驱动器号的字符串长度
	dwNumBytesForDriveStrings=GetLogicalDriveStrings(0,NULL)*sizeof(TCHAR);

	//如果字符串不为空，则表示有正常的驱动器存在
	if (dwNumBytesForDriveStrings!=0) {
		//分配字符串空间
		hHeap=GetProcessHeap();
		lp=(LPSTR)HeapAlloc(hHeap,HEAP_ZERO_MEMORY,
			dwNumBytesForDriveStrings);

		//获得标明所有驱动器的字符串
		GetLogicalDriveStrings(HeapSize(hHeap,0,lp),lp);

		//将驱动器一个个放到下拉框中
		int nIndex = 0;
		while (*lp!=0)
		{
			Driver->AddString(lp);

			//将驱动器信息保存在数组中
			DRVITEM drv;
			drv.nItem = nIndex;
			drv.strDrv = lp;
			arrDrvItems.Add(drv);

			lp=_tcschr(lp,0)+1;
			nIndex++;
		}

		//设第一个驱动器被选择
		Driver->SetCurSel(0);
		OnSelchangeDriver();
	}
	else 
		AfxMessageBox("Can't Use The Function GetLogicalDriveStrings!");
}

//辨别驱动器
void CDisCdromAndFdDlg::DisDriver(CString strDriver)
{
	//获得驱动器类型
	UINT DrvType = GetDriveType(strDriver);
	CStatic* pTypeWnd = (CStatic*)GetDlgItem(IDC_STATIC_TYPE);
	CString strType = "";
	switch(DrvType)
	{
	case DRIVE_CDROM:
		strType = "磁盘类型:光驱";
		break;
	case DRIVE_FIXED:
		strType = "磁盘类型:硬盘";
		break;
	case DRIVE_REMOVABLE:
		strType = "磁盘类型:软驱";
		break;
	default:
		return;
		break;
	}
	pTypeWnd->SetWindowText(strType);

	//获得驱动器根目录的文件和文件夹
	CListBox* pList = (CListBox*)GetDlgItem(IDC_LIST_FILES);
	while(pList->GetCount()>0)
		pList->DeleteString(0);
	CFileFind ff;
	CString szDir = strDriver;
	
	if(szDir.Right(1) != "\\")
		szDir += "\\";
	
	szDir += "*.*";
	
	BOOL res = ff.FindFile(szDir);
	while(res)
	{
		res = ff.FindNextFile();
		if(!ff.IsDots())
		{
			pList->AddString(ff.GetFileName());
		}
	}
	ff.Close();//关闭
}

//当前驱动器改变了
void CDisCdromAndFdDlg::OnSelchangeDriver() 
{
	CComboBox* Driver=(CComboBox*)GetDlgItem(IDC_DRIVER);
	//获得序号
	int nSel  = Driver->GetCurSel();
	if(nSel>-1)
	{
		//获得驱动器名称
		CString strDriver = arrDrvItems.GetAt(nSel).strDrv;
		
		//辨别该驱动器
		DisDriver(strDriver);
	}
}