C++ 检测物理内存以及磁盘空间

BOOL CheckResource()
{
    MEMORYSTATUSEX statex;
    statex.dwLength = sizeof (statex);
    GlobalMemoryStatusEx(&statex);
    if (statex.ullTotalPhys /  /  /  < ){
        ::MessageBox(NULL, L"物理内存小于 2G", L"提示", MB_ICONWARNING);
        return ;
    }
    if (statex.ullAvailPhys /  /  / < ){
        ::MessageBox(NULL, L"物理有效内存小于 1G", L"提示", MB_ICONWARNING);
        return ;
    }

    ULARGE_INTEGER lpFreeBytesAvailable;
    ULARGE_INTEGER lpTotalNumberOfBytes;
    ULARGE_INTEGER lpTotalNumberOfFreeBytes;

    GetDiskFreeSpaceEx(NULL, &lpFreeBytesAvailable, &lpTotalNumberOfBytes, &lpTotalNumberOfFreeBytes);
    if (lpTotalNumberOfFreeBytes.QuadPart /  /  /  < ){
        ::MessageBox(NULL, L"磁盘有效空间小于 50G", L"提示", MB_ICONWARNING);
        return ;
    }
    return TRUE;
}