C++ 监测磁盘空间

硬盘管理器

头文件 HardDiskManager.h ：

#if _MSC_VER > 1000
#pragma once
#endif

#include <windows.h>

class CHardDiskManager
{
public:
    CHardDiskManager();
    virtual ~CHardDiskManager();

    bool CheckFreeSpace(LPCTSTR lpDirectoryName);

    DWORD64 GetFreeBytesAvailable(void);
    DWORD64 GetTotalNumberOfBytes(void);
    DWORD64 GetTotalNumberOfFreeBytes(void);

    double GetFreeGBytesAvailable(void);
    double GetTotalNumberOfGBytes(void);
    double GetTotalNumberOfFreeGBytes(void);

private:
    ULARGE_INTEGER m_uliFreeBytesAvailable;
    ULARGE_INTEGER m_uliTotalNumberOfBytes;
    ULARGE_INTEGER m_uliTotalNumberOfFreeBytes;
};

_MSC_VER: 用来定义当前微软公司自己的编译器的主版本

MS VC++ 14.0 _MSC_VER = 1900 (Visual Studio 2015)

MS VC++ 12.0 _MSC_VER = 1800 (VisualStudio 2013)

MS VC++ 11.0 _MSC_VER = 1700 (VisualStudio 2012)

MS VC++ 10.0 _MSC_VER = 1600(VisualStudio 2010)

MS VC++ 9.0 _MSC_VER = 1500(VisualStudio 2008)

MS VC++ 8.0 _MSC_VER = 1400(VisualStudio 2005)

MS VC++ 7.1 _MSC_VER = 1310(VisualStudio 2003)

MS VC++ 7.0 _MSC_VER = 1300(VisualStudio .NET)

MS VC++ 6.0 _MSC_VER = 1200(VisualStudio 98)

MS VC++ 5.0 _MSC_VER = 1100(VisualStudio 97)

ULARGE_INTEGER:一个64位的无符号整型值

源文件 HardDiskManager.cpp ：

// HardDiskManager.cpp

#include <afxwin.h>
#include "HardDiskManager.h"

CHardDiskManager::CHardDiskManager()
{
    m_uliFreeBytesAvailable.QuadPart     = 0L;
    m_uliTotalNumberOfBytes.QuadPart     = 0L;
    m_uliTotalNumberOfFreeBytes.QuadPart = 0L;
}

CHardDiskManager::~CHardDiskManager()
{
}

bool CHardDiskManager::CheckFreeSpace(LPCTSTR lpDirectoryName)
{
    if( !GetDiskFreeSpaceEx(
        lpDirectoryName,
        &m_uliFreeBytesAvailable,
        &m_uliTotalNumberOfBytes,
        &m_uliTotalNumberOfFreeBytes) )
        return false;

    return true;
}

DWORD64 CHardDiskManager::GetFreeBytesAvailable(void)
{
    return m_uliFreeBytesAvailable.QuadPart;
}

DWORD64 CHardDiskManager::GetTotalNumberOfBytes(void)
{
    return m_uliTotalNumberOfBytes.QuadPart;
}

DWORD64 CHardDiskManager::GetTotalNumberOfFreeBytes(void)
{
    return m_uliTotalNumberOfFreeBytes.QuadPart;
}

double CHardDiskManager::GetFreeGBytesAvailable(void)
{
    return (double)( (signed __int64)(m_uliFreeBytesAvailable.QuadPart)/ );
}

double CHardDiskManager::GetTotalNumberOfGBytes(void)
{
    return (double)( (signed __int64)(m_uliTotalNumberOfBytes.QuadPart)/ );
}

double CHardDiskManager::GetTotalNumberOfFreeGBytes(void)
{
    return (double)( (signed __int64)(m_uliTotalNumberOfFreeBytes.QuadPart)/ );
}

LPCTSTR用来表示你的字符是否使用UNICODE, 如果你的程序定义了UNICODE或者其他相关的宏，那么这个字符或者字符串将被作为UNICODE字符串，否则就是标准的ANSI字符串。

DWORD全称Double Word，是指注册表的键值，每个word为2个字节的长度，DWORD 双字即为4个字节，每个字节是8位，共32位。

DWORD64 无符号整型值。

调用：

// HardDisk.cpp : Defines the entry point for the console application.

#include "stdafx.h"
#include <iostream>
#include "HardDiskManager.h"
#include <tchar.h>

using namespace std;

int main(int argc, char* argv[])
{
    CHardDiskManager manager;

    manager.CheckFreeSpace(_T("c:"));
    cout << "Drive C:\\" << endl;
    cout << "FreeBytesAvailable:     " << manager.GetFreeGBytesAvailable()     << " GBytes. " << endl;
    cout << "TotalNumberOfBytes:     " << manager.GetTotalNumberOfGBytes()     << " GBytes. " << endl;
    cout << "TotalNumberOfFreeBytes: " << manager.GetTotalNumberOfFreeGBytes() << " GBytes. " << endl;

    manager.CheckFreeSpace(_T("d:"));
    cout << "Drive D:\\" << endl;
    cout << "FreeBytesAvailable:     " << manager.GetFreeGBytesAvailable()     << " GBytes. " << endl;
    cout << "TotalNumberOfBytes:     " << manager.GetTotalNumberOfGBytes()     << " GBytes. " << endl;
    cout << "TotalNumberOfFreeBytes: " << manager.GetTotalNumberOfFreeGBytes() << " GBytes. " << endl;

    return ;
}

DWORD   详细X

基本翻译

abbr. 双字值（Double Word）

网络释义

DWORD: 双字节值

DWORD WriteTotalTimeoutConstant: 写时间常量

DWORD ReadTotalTimeoutConstant: 读时间常量