Ｃ++使用Windows SDK获取系统分区大小以及使用情况，代码如下：

// ConsoleApplication1.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"

#include <stdint.h>
#include <windows.h>
#include <iostream>
#include <string>

using namespace std;

void TestDrive()
{
    cout << "TestDrive" << endl;
    char* lpDrives = (char *)malloc(MAX_PATH * sizeof(char ));
    memset(lpDrives, 0, MAX_PATH * sizeof (char));

    DWORD dwLen = ::GetLogicalDriveStringsA(MAX_PATH, lpDrives);
    cout << "dwLen: " << dwLen << endl;

    DWORD driver_number = dwLen / 4;
    cout << "driver_number: " << driver_number << endl;

    string driver;
    LPTSTR start;
    for (DWORD nIndex = 0; nIndex < driver_number; nIndex++)
    {
        start = lpDrives + nIndex * 4;
        cout << "........................................." << endl;
        driver.append(start);
        cout << "lpDrives + nIndex * 4: " << lpDrives + nIndex * 4 << endl;
        cout << "DRIVE_REMOVABLE: " << DRIVE_REMOVABLE << endl;
        cout << "::GetDriveType(lpDrives + nIndex * 4): " << :: GetDriveType(lpDrives + nIndex * 4) << endl;
        if (::GetDriveType (start) == DRIVE_REMOVABLE)
        {
            driver.append(start);
            if (GetVolumeInformation (start, 0, 0, 0, 0, 0, 0, 0)) //判断驱动是否准备就绪
            {
                cout << "驱动准备就绪 " << endl;
            }
        }
        uint64_t lpFreeBytesAvailable = 0;
        uint64_t lpTotalNumberOfBytes = 0;
        uint64_t lpTotalNumberOfFreeBytes = 0;
        GetDiskFreeSpaceExA(lpDrives + nIndex * 4,
                            (PULARGE_INTEGER)&lpFreeBytesAvailable,
                            (PULARGE_INTEGER)&lpTotalNumberOfBytes,
                            (PULARGE_INTEGER)&lpTotalNumberOfFreeBytes);
        cout << "lpFreeBytesAvailable: " << lpFreeBytesAvailable << endl;
        cout << "lpTotalNumberOfBytes: " << lpTotalNumberOfBytes << endl;
        cout << "lpTotalNumberOfFreeBytes: " << lpTotalNumberOfFreeBytes << endl;
    }
    std::cout << "driver: " << driver << endl;
}

int main(int argc, char *argv[])
{
    TestDrive();
    return 0;
}