1、写在后面

前篇咱们曾经实现了一个 Monitor 所须要大部分的内容。

然而，硬件资源的监控相对来说比拟麻烦。

不过，咱们能够借助 Qt，实际上它也提供了不少相干的 Api。

2、注释开始

当初咱们须要监控机器的硬件资源。

所谓硬件资源，次要分为三种：

1、获取磁盘应用：

Qt 中获取磁盘信息的类为 QStorageInfo。

QStorageInfo容许检索无关卷空间的信息，其装入点，标签和文件系统名称。您能够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立 QStorageInfo 的实例，或者您能够应用 setPath() 办法设置它。 动态挂载 volumes() 办法可用于获取所有已装置文件系统的列表。QStorageInfo 始终高速缓存检索到的信息，但能够调用 refresh() 来使缓存有效。

当初咱们应用他实现一个获取磁盘用量的通用接口：

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;}

当然，Windows 平台的磁盘名稍有不同。

2、获取 CPU 利用率：

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;}

3、获取内存使用率：

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;}

4、获取网络流量：

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;}

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