关于MFC获取磁盘驱动器类型的问题

[waittingUyou]

计算机小白，刚在学习MFC，照搬课本的内容写了一些代码，但是运行结果有问题，代码如下：
.cpp:
// SelectDiskDriverDlg.cpp : 实现文件
//

#include "stdafx.h"
#include "SelectDiskDriver.h"
#include "SelectDiskDriverDlg.h"
#include "afxdialogex.h"
#include <string>

#ifdef _DEBUG
#define new DEBUG_NEW
#endif
// 用于应用程序“关于”菜单项的 CAboutDlg 对话框

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

// 对话框数据
#ifdef AFX_DESIGN_TIME
enum { IDD = IDD_ABOUTBOX };
#endif

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

// 实现
protected:
DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialogEx(IDD_ABOUTBOX)
{
}

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

BEGIN_MESSAGE_MAP(CAboutDlg, CDialogEx)
END_MESSAGE_MAP()


// CSelectDiskDriverDlg 对话框



CSelectDiskDriverDlg::CSelectDiskDriverDlg(CWnd* pParent /*=NULL*/)
: CDialogEx(IDD_SELECTDISKDRIVER_DIALOG, pParent)
, m_DriveType(_T(""))
{
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CSelectDiskDriverDlg::DoDataExchange(CDataExchange* pDX)
{
CDialogEx::DoDataExchange(pDX);
DDX_Control(pDX, IDC_COMBO_DRIVE, m_drive);
DDX_Text(pDX, IDC_STATIC1, m_DriveType);
}

BEGIN_MESSAGE_MAP(CSelectDiskDriverDlg, CDialogEx)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
ON_CBN_SELCHANGE(IDC_COMBO_DRIVE, &CSelectDiskDriverDlg::OnCbnSelchangeComboDrive)
END_MESSAGE_MAP()


// CSelectDiskDriverDlg 消息处理程序

BOOL CSelectDiskDriverDlg::OnInitDialog()
{
CDialogEx::OnInitDialog();

// 将“关于...”菜单项添加到系统菜单中。

// IDM_ABOUTBOX 必须在系统命令范围内。
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
ASSERT(IDM_ABOUTBOX < 0xF000);

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

// 设置此对话框的图标。 当应用程序主窗口不是对话框时，框架将自动
// 执行此操作
SetIcon(m_hIcon, TRUE); // 设置大图标
SetIcon(m_hIcon, FALSE); // 设置小图标

// TODO: 在此添加额外的初始化代码
size_t alldrive = ::GetLogicalDriveStrings(0, NULL);

_TCHAR *driverstr;
driverstr = new _TCHAR[alldrive + sizeof(_T(""))];

size_t twosize = GetLogicalDriveStrings(alldrive, driverstr);

CString DriveLetter;
for (int i = 0; i < alldrive / 4; i++)
{
DriveLetter = driverstr + i * 4+4;
m_drive.InsertString(i, DriveLetter.GetBuffer());
}
m_drive.SetCurSel(0);
return TRUE; // 除非将焦点设置到控件，否则返回 TRUE
}

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

// 如果向对话框添加最小化按钮，则需要下面的代码
// 来绘制该图标。 对于使用文档/视图模型的 MFC 应用程序，
// 这将由框架自动完成。

void CSelectDiskDriverDlg::OnPaint()
{
if (IsIconic())
{
CPaintDC dc(this); // 用于绘制的设备上下文

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

// 使图标在工作区矩形中居中
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;

// 绘制图标
dc.DrawIcon(x, y, m_hIcon);
}
else
{
CDialogEx::OnPaint();
}
}

//当用户拖动最小化窗口时系统调用此函数取得光标
//显示。
HCURSOR CSelectDiskDriverDlg::OnQueryDragIcon()
{
return static_cast<HCURSOR>(m_hIcon);
}


void CSelectDiskDriverDlg::OnCbnSelchangeComboDrive()
{
// TODO: 在此添加控件通知处理程序代码
CString strDrive;
m_drive.GetWindowTextW(strDrive);
int retCode = ::GetDriveType(strDrive.GetBuffer());
switch (retCode)
{
case DRIVE_UNKNOWN:
m_DriveType = "驱动器类型：未知";
break;
case DRIVE_NO_ROOT_DIR:
m_DriveType = "驱动器类型：驱动器根路径错误";
break;
case DRIVE_REMOVABLE:
m_DriveType = "驱动器类型：可移动磁盘驱动器";
break;
case DRIVE_FIXED:
m_DriveType = "驱动器类型：固定磁盘驱动器";
break;
case DRIVE_REMOTE:
m_DriveType = "驱动器类型：网络磁盘驱动器";
break;
case DRIVE_CDROM:
m_DriveType = "驱动器类型：CD-ROM";
break;
case DRIVE_RAMDISK:
m_DriveType = "驱动器类型：RAM";
break;
default:
m_DriveType = "驱动器类型：未知";
break;
}
UpdateData(FALSE);
}
.h:

// SelectDiskDriverDlg.h : 头文件
//

#pragma once
#include "afxwin.h"


// CSelectDiskDriverDlg 对话框
class CSelectDiskDriverDlg : public CDialogEx
{
// 构造
public:
CSelectDiskDriverDlg(CWnd* pParent = NULL); // 标准构造函数

// 对话框数据
#ifdef AFX_DESIGN_TIME
enum { IDD = IDD_SELECTDISKDRIVER_DIALOG };
#endif

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


// 实现
protected:
HICON m_hIcon;

// 生成的消息映射函数
virtual BOOL OnInitDialog();
afx_msg void OnSysCommand(UINT nID, LPARAM lParam);
afx_msg void OnPaint();
afx_msg HCURSOR OnQueryDragIcon();
DECLARE_MESSAGE_MAP()
public:
afx_msg void OnCbnSelchangeCombo1();
afx_msg void OnCbnSelchangeComboDrive();
CComboBox m_drive;
CString m_DriveType;
};
课本给出的结果是可以通过STATIC TEXT控件显示驱动器类型，然而我的代码运行出来的显示结果都是“STATIC”
如图
请问大神们怎么解决，是哪里出了问题？
运行结果貌似有内存泄露，跟这个有关系吗？

[schlafenhamster]

1 init

	// TODO: Add extra initialization here
	ULONG alldrive = ::GetLogicalDriveStrings(0, NULL);// 9

	TCHAR driverstr[1024];
//	driverstr = new TCHAR[alldrive + sizeof(_T(""))];

	ULONG twosize = GetLogicalDriveStrings(alldrive, driverstr);

	CString DriveLetter;// "C:\" "D:\"
	for (UINT i = 0; i < alldrive / 4; i++)
	{
		DriveLetter = driverstr + i * 4;
		m_Drive.InsertString(i, DriveLetter);
	}
	m_Drive.SetCurSel(0);
//
	OnSelchangeCombo1();	
//
	return TRUE;  // return TRUE  unless you set the focus to a control

2 void CSelectDiskDriverDlg::OnSelchangeCombo1() { // TODO: Add your control notification handler code here CString strDrive; int now=m_Drive.GetCurSel(); m_Drive.GetLBText(now,strDrive); // not // m_Drive.GetWindowText(strDrive); int retCode = ::GetDriveType(strDrive); switch (retCode) { case DRIVE_UNKNOWN: m_DriveType = "驱动器类型：未知"; break; case DRIVE_NO_ROOT_DIR: m_DriveType = "类型：驱动器根路径错误"; break; case DRIVE_REMOVABLE:// 2 m_DriveType = "类型：可移动磁盘驱动器"; break; case DRIVE_FIXED:// 3 m_DriveType = "类型：固定磁盘驱动器"; break; case DRIVE_REMOTE: m_DriveType = "类型：网络磁盘驱动器"; break; case DRIVE_CDROM: m_DriveType = "类型：CD-ROM"; break; case DRIVE_RAMDISK: m_DriveType = "类型：RAM"; break; default: m_DriveType = "类型：未知"; break; } UpdateData(FALSE); } 注意 // not // m_Drive.GetWindowText(strDrive);

[zgl7903]

CString strDrive; int iSel = m_drive.GetCurSel(); if(iSel != CB_ERR) m_drive.GetLBText(iSel, strDrive); int retCode = ::GetDriveType((LPCTSTR)strDrive); _TCHAR *driverstr = new _TCHAR[alldrive + sizeof(_T(""))]; …… delete [] driverstr;

[向立天]

你给STATIC设置ID了么