全景AR增强监视系统对接SkeyeIVMS视频云管控系统实现软硬件资源的健康状态管理(三)

QStorageInfo

允许检索有关卷空间的信息，其装入点，标签和文件系统名称。

您可以通过将卷的挂载点作为构造函数参数传递给函数的挂载点来创建 QStorageInfo 的实例，或者您可以使用 setPath() 方法设置它。 

静态挂载 volumes() 方法可用于获取所有已安装文件系统的列表。

QStorageInfo 始终高速缓存检索到的信息，但可以调用 refresh() 来使缓存无效。

QVariantList MonitorApi::getDrives()
{
    QVariantList drives;
    for (const QStorageInfo &storage: QStorageInfo::mountedVolumes()) {
        if (storage.isValid() && storage.isReady()) {
            if (!storage.isReadOnly()) {
                QVariantMap drive;
                uint driveType;
                QString driveName = storage.name();
#ifdef Q_OS_WIN
                driveType = GetDriveType(LPCWSTR(storage.rootPath().utf16()));
                switch (driveType) {
                case 2:
                    driveName = storage.name().isEmpty() ? QStringLiteral("U盘") : storage.name();
                    break;
                case 3:
                    driveName = storage.name().isEmpty() ? QStringLiteral("本地磁盘") : storage.name();
                    break;
                case 4:
                    driveName = storage.name().isEmpty() ? QStringLiteral("网络磁盘") : storage.name();
                    break;
                case 5:
                    driveName = storage.name().isEmpty() ? QStringLiteral("CD-ROM 驱动器") : storage.name();
                    break;
                case 6:
                    driveName = storage.name().isEmpty() ? QStringLiteral("RAM磁盘") : storage.name();
                    break;
                default:
                    driveName = storage.name().isEmpty() ? QStringLiteral("磁盘") : storage.name();
                    break;
                }
#endif
                drive["drivePath"] = storage.rootPath();
                drive["driveName"] = driveName;
                drive["usedSize"] = storage.bytesTotal() - storage.bytesFree();
                drive["totalSize"] = storage.bytesTotal();
                drives.append(drive);
            }
        }
    }

    return drives;
}

qreal MonitorApi::getCpuUsageRate()
{
    qreal usageRate = 0.0;

#ifdef Q_OS_WIN
    static FILETIME preidleTime;
    static FILETIME prekernelTime;
    static FILETIME preuserTime;

    FILETIME idleTime;
    FILETIME kernelTime;
    FILETIME userTime;

    GetSystemTimes(&idleTime, &kernelTime, &userTime);

    quint64 a, b;
    quint64 idle, kernel, user;

    a = (quint64(preidleTime.dwHighDateTime) << 32) | preidleTime.dwLowDateTime;
    b = (quint64(idleTime.dwHighDateTime ) << 32) | idleTime.dwLowDateTime;
    idle = b -a;

    a = (quint64(prekernelTime.dwHighDateTime) << 32) | prekernelTime.dwLowDateTime;
    b = (quint64(kernelTime.dwHighDateTime) << 32) | kernelTime.dwLowDateTime;
    kernel = b - a;

    a = (quint64(preuserTime.dwHighDateTime) << 32) | preuserTime.dwLowDateTime;
    b = (quint64(userTime.dwHighDateTime) << 32) | userTime.dwLowDateTime;
    user = b - a;

    usageRate = qreal(kernel + user - idle) / qreal(kernel + user);

    preidleTime = idleTime;
    prekernelTime = kernelTime;
    preuserTime = userTime;
#endif

    return usageRate > 1.0 ? 1.0 : usageRate;
}

QVariant MonitorApi::getMemoryStatus()
{
    QVariantMap map;
#ifdef Q_OS_WIN
    MEMORYSTATUSEX statex;
    statex.dwLength = sizeof (statex);
    GlobalMemoryStatusEx(&statex);
    quint64 memoryAll = statex.ullTotalPhys;
    quint64 memoryFree = statex.ullAvailPhys;
    quint64 memoryUsed = memoryAll - memoryFree;
    map["usedSize"] = memoryUsed;
    map["totalSize"] = memoryAll;
#endif

    return map;
}

QVariant MonitorApi::getNetworkStatus()
{
    QVariantMap map;

#ifdef Q_OS_WIN
    static bool initialized = false;
    static quint64 preRecvTotal = 0;
    static quint64 preSendTotal = 0;

    quint64 recvTotal = 0;
    quint64 sendTotal = 0;

    MIB_IF_ROW2 *ifRow;
    PMIB_IF_TABLE2 ifTable;

    if (GetIfTable2(&ifTable) == NO_ERROR)  {
        QSet<QString> addressSet;
        for (DWORD i = 0; i < ifTable->NumEntries; i++) {
            ifRow = (MIB_IF_ROW2 *)&ifTable->Table[i];
            if (ifRow->Type == IF_TYPE_ETHERNET_CSMACD) {
                QString addr;
                for (ULONG i = 0; i < ifRow->PhysicalAddressLength; i++) {
                    addr += QString::number(ifRow->PhysicalAddress[i], 16).rightJustified(2, '0');
                }
                if (!addressSet.contains(addr)) {
                    addressSet.insert(addr);
                    recvTotal += ifRow->InOctets;
                    sendTotal += ifRow->OutOctets;
                    //qDebug() << i << addr << ifRow->InOctets << ifRow->OutOctets;
                }
            }
        }
        FreeMibTable(ifTable);
    }

    if (!initialized) {
        preRecvTotal = recvTotal;
        preSendTotal = sendTotal;
        initialized = true;
    }

    map["downloadSize"] = recvTotal - preRecvTotal;
    map["uploadSize"] = sendTotal - preSendTotal;
    map["trafficSize"] = (recvTotal + sendTotal) - (preRecvTotal + preSendTotal);

    preRecvTotal = recvTotal;
    preSendTotal = sendTotal;
#endif

    return map;
}