获取磁盘总空间和剩余空间

BOOL MyLocalMacIP::GetSpaceInfo(CString &totalspace, CString &usedspace)  
{  
    long long total = 0;  
    long long used = 0;  
  
    ::vector<CString> drivernames;  
    int drivernum = 0;  
  
    CString str;  
  
    DWORD size = ::GetLogicalDriveStringsA(0, NULL);  
    if (0 != size)  
    {  
        HANDLE heap = ::GetProcessHeap();  
        LPSTR lp = (LPSTR)HeapAlloc(heap, HEAP_ZERO_MEMORY, size*sizeof(TCHAR));  
        ::GetLogicalDriveStringsA(size*sizeof(TCHAR), lp);  
  
        while(0 != *lp )  
        {  
            /* we don‘t need C:*/  
            int str_num = strcmp((char*)lp, ("C:\\"));  
            if (str_num == 0)  
            {  
                lp = strchr(lp, 0)+1;  
                continue;  
            }  
            wchar_t* lp_buffer = conversion.CharToWchar(lp);  
            UINT res = ::GetDriveTypeW(lp_buffer);  
            if(DRIVE_FIXED == res)  
            {  
                CString str = lp;  
                drivernames.push_back(str);  
                drivernum++;  
            }  
            delete []lp_buffer;  
            lp = strchr(lp, 0)+1;  
      
        }  
  
    }  
    ULARGE_INTEGER FreeSpace, CallSpace, TotalSpace;  
      
    for (int i = 0; i < drivernum; i++)  
    {  
        ::GetDiskFreeSpaceEx(drivernames[i], &FreeSpace, &CallSpace, &TotalSpace);  
         total += CallSpace.QuadPart;  
         used += FreeSpace.QuadPart;  
    }  
  
    string stotal = conversion.IntToString(total);  
    string sused = conversion.IntToString(used);  
    totalspace = CString(stotal.c_str());  
    usedspace = CString(sused.c_str());  
  
    return TRUE;  
}