C ++像任务管理器一样获得网络利用率

Question

我正在尝试获取任务管理器中显示的网络适配器利用率。 我现在尝试使用WMI，并且我能够获得每秒每秒接收的字节数/每秒发送的字节数。有没有办法让任务管理器中显示预先计算的值（0-100％），还是可以使用它们来计算该值？

IEnumWbemClassObject* pEnumerator = NULL;
hres = pSvc->ExecQuery(
    bstr_t("WQL"),
    bstr_t("SELECT * FROM Win32_PerfRawData_Tcpip_NetworkInterface"),
    WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY,
    NULL,
    &pEnumerator);

if (FAILED(hres))
{
    cout << "Query for operating system name failed."
        << " Error code = 0x"
        << hex << hres << endl;
    pSvc->Release();
    pLoc->Release();
    CoUninitialize();
    return 1;               // Program has failed.
}


// Get the data from the query
IWbemClassObject *pclsObj = NULL;
ULONG uReturn = 0;

while (pEnumerator)
{

    HRESULT hr = pEnumerator->Next(WBEM_INFINITE, 1,
        &pclsObj, &uReturn);

    if (0 == uReturn)
    {
    break;
    }


    VARIANT vtProp;
    VariantInit(&vtProp);

    hr = pclsObj->Get(L"Name", 0, &vtProp, 0, 0);
    wcout << " network adapter : " << vtProp.bstrVal << endl;
    VariantClear(&vtProp);

    hr = pclsObj->Get(L"BytesReceivedPerSec", 0, &vtProp, 0, 0);        
    wcout << " BytesReceivedPerSec  : " << vtProp.bstrVal << endl;
    VariantClear(&vtProp);

    hr = pclsObj->Get(L"BytesSentPerSec", 0, &vtProp, 0, 0);        
    wcout << " BytesSentPerSec  : " << vtProp.bstrVal << endl;
    VariantClear(&vtProp);

    hr = pclsObj->Get(L"Timestamp_Sys100NS", 0, &vtProp, 0, 0);
    wcout << " Timestamp_Sys100NS  : " << vtProp.bstrVal << endl;
    VariantClear(&vtProp);




    pclsObj->Release();
}

Answer 1

您的查询包含字段CurrentBandwidth，您可以使用该字段计算百分比。

float pct = (BytesReceivedPerSec * 100.f) / (CurrentBandwidth * 800.f)