discdromandfddlg.h

这个是怎么判别并定位到光驱（软驱）的源码

// DisCdromAndFdDlg.h : header file
//

#if !defined(AFX_DISCDROMANDFDDLG_H__AC3FD367_8609_11D6_8F32_00E04CE76240__INCLUDED_)
#define AFX_DISCDROMANDFDDLG_H__AC3FD367_8609_11D6_8F32_00E04CE76240__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

/////////////////////////////////////////////////////////////////////////////
// CDisCdromAndFdDlg dialog
#include <afxtempl.h>

//定义驱动器信息结构
typedef struct drvitem
{
	int nItem;
	CString strDrv;
}DRVITEM;
class CDisCdromAndFdDlg : public CDialog
{
// Construction
public:
	CDisCdromAndFdDlg(CWnd* pParent = NULL);	// standard constructor

// Dialog Data
	//{{AFX_DATA(CDisCdromAndFdDlg)
	enum { IDD = IDD_DISCDROMANDFD_DIALOG };
	//}}AFX_DATA

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

// Implementation
protected:
	HICON m_hIcon;
	CArray<DRVITEM,DRVITEM&>arrDrvItems;		//保存所有驱动器信息
	void FindAllDrivers();
	void DisDriver(CString strDriver);
	// Generated message map functions
	//{{AFX_MSG(CDisCdromAndFdDlg)
	virtual BOOL OnInitDialog();
	afx_msg void OnSysCommand(UINT nID, LPARAM lParam);
	afx_msg void OnPaint();
	afx_msg HCURSOR OnQueryDragIcon();
	afx_msg void OnSelchangeDriver();
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
};

//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.

#endif // !defined(AFX_DISCDROMANDFDDLG_H__AC3FD367_8609_11D6_8F32_00E04CE76240__INCLUDED_)