計算機小白，剛在學習MFC，照搬課本的內容寫了一些代碼，但是運行結果有問題，代碼如下：
.cpp:
// SelectDiskDriverDlg.cpp : 實作檔案
//
#include "stdafx.h"
#include "SelectDiskDriver.h"
#include "SelectDiskDriverDlg.h"
#include "afxdialogex.h"
#include <string>
#ifdef _DEBUG
#define new DEBUG_NEW
#endif
// 用于應用程式“關于”選單項的 CAboutDlg 對話框
class CAboutDlg : public CDialogEx
{
public:
CAboutDlg();
// 對話框資料
#ifdef AFX_DESIGN_TIME
enum { IDD = IDD_ABOUTBOX };
#endif
protected:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV 支持
// 實作
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 對話框
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 訊息處理程式
BOOL CSelectDiskDriverDlg::OnInitDialog()
{
CDialogEx::OnInitDialog();
// 將“關于...”選單項添加到系統選單中。
// IDM_ABOUTBOX 必須在系統命令范圍內。
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);
}
}
// 設定此對話框的圖示。 當應用程式主視窗不是對話框時，框架將自動
// 執行此操作
SetIcon(m_hIcon, TRUE); // 設定大圖示
SetIcon(m_hIcon, FALSE); // 設定小圖示
// TODO: 在此添加額外的初始化代碼
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; // 除非將焦點設定到控制元件，否則回傳 TRUE
}
void CSelectDiskDriverDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
if ((nID & 0xFFF0) == IDM_ABOUTBOX)
{
CAboutDlg dlgAbout;
dlgAbout.DoModal();
}
else
{
CDialogEx::OnSysCommand(nID, lParam);
}
}
// 如果向對話框添加最小化按鈕，則需要下面的代碼
// 來繪制該圖示。 對于使用檔案/視圖模型的 MFC 應用程式，
// 這將由框架自動完成。
void CSelectDiskDriverDlg::OnPaint()
{
if (IsIconic())
{
CPaintDC dc(this); // 用于繪制的設備背景關系
SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);
// 使圖示在作業區矩形中居中
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;
// 繪制圖示
dc.DrawIcon(x, y, m_hIcon);
}
else
{
CDialogEx::OnPaint();
}
}
//當用戶拖動最小化視窗時系統呼叫此函式取得游標
//顯示。
HCURSOR CSelectDiskDriverDlg::OnQueryDragIcon()
{
return static_cast<HCURSOR>(m_hIcon);
}
void CSelectDiskDriverDlg::OnCbnSelchangeComboDrive()
{
// TODO: 在此添加控制元件通知處理程式代碼
CString strDrive;
m_drive.GetWindowTextW(strDrive);
int retCode = ::GetDriveType(strDrive.GetBuffer());
switch (retCode)
{
case DRIVE_UNKNOWN:
m_DriveType = "驅動器型別：未知";
break;
case DRIVE_NO_ROOT_DIR:
m_DriveType = "驅動器型別：驅動器根路徑錯誤";
break;
case DRIVE_REMOVABLE:
m_DriveType = "驅動器型別：可移動磁盤驅動器";
break;
case DRIVE_FIXED:
m_DriveType = "驅動器型別：固定磁盤驅動器";
break;
case DRIVE_REMOTE:
m_DriveType = "驅動器型別：網路磁盤驅動器";
break;
case DRIVE_CDROM:
m_DriveType = "驅動器型別：CD-ROM";
break;
case DRIVE_RAMDISK:
m_DriveType = "驅動器型別：RAM";
break;
default:
m_DriveType = "驅動器型別：未知";
break;
}
UpdateData(FALSE);
}
.h:
// SelectDiskDriverDlg.h : 頭檔案
//
#pragma once
#include "afxwin.h"
// CSelectDiskDriverDlg 對話框
class CSelectDiskDriverDlg : public CDialogEx
{
// 構造
public:
CSelectDiskDriverDlg(CWnd* pParent = NULL); // 標準建構式
// 對話框資料
#ifdef AFX_DESIGN_TIME
enum { IDD = IDD_SELECTDISKDRIVER_DIALOG };
#endif
protected:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV 支持
// 實作
protected:
HICON m_hIcon;
// 生成的訊息映射函式
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;
};
課本給出的結果是可以通過STATIC TEXT控制元件顯示驅動器型別，然而我的代碼運行出來的顯示結果都是“STATIC”
如圖請問大神們怎么解決，是哪里出了問題？
運行結果貌似有記憶體泄露，跟這個有關系嗎？
uj5u.com熱心網友回復：
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;
uj5u.com熱心網友回復：
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 = "驅動器型別：未知";
break;
case DRIVE_NO_ROOT_DIR:
m_DriveType = "型別：驅動器根路徑錯誤";
break;
case DRIVE_REMOVABLE:// 2
m_DriveType = "型別：可移動磁盤驅動器";
break;
case DRIVE_FIXED:// 3
m_DriveType = "型別：固定磁盤驅動器";
break;
case DRIVE_REMOTE:
m_DriveType = "型別：網路磁盤驅動器";
break;
case DRIVE_CDROM:
m_DriveType = "型別：CD-ROM";
break;
case DRIVE_RAMDISK:
m_DriveType = "型別：RAM";
break;
default:
m_DriveType = "型別：未知";
break;
}
UpdateData(FALSE);
}
注意
// not
// m_Drive.GetWindowText(strDrive);
uj5u.com熱心網友回復：
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