VC++監控網卡狀態

VC++監控網卡狀態

通常狀況下，咱們只獲取網卡IP就夠了，可是今天有個需求，須要監控網卡狀態，經查找，須要使用COM技術實現，核心Class以下：

微軟在WINDOWS VISTA以後提供了一個叫NLA(Network List Manager API)的接口，用於獲取網絡狀態變化通知的一個接口。以COM技術實現。
主要導出的COM接口以下：
IEnumNetworkConnections
IEnumNetworks
INetwork
INetworkConnection
INetworkConnectionEvents
INetworkEvents
INetworkListManager
INetworkListManagerEvents
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參考Url : 
1. https://msdn.microsoft.com/en-us/library/windows/desktop/aa370799(v=vs.85).aspx 
2. https://www.codeproject.com/Articles/574446/Using-Network-List-Manager-Cplusplus

代碼

// Demo1.cpp : 定義控制檯應用程序的入口點。
//

#include "stdafx.h"

#include <windows.h>
#include <netlistmgr.h>

#pragma comment(lib, "ole32.lib")

class MyNetWorkEvent : public INetworkListManagerEvents 
{
public:
    MyNetWorkEvent() {
        m_ref = 1;
    }
    /*
    typedef enum NLM_CONNECTIVITY {
      NLM_CONNECTIVITY_DISCONNECTED       = 0x0000, // 斷開鏈接
      NLM_CONNECTIVITY_IPV4_NOTRAFFIC     = 0x0001, // 不通
      NLM_CONNECTIVITY_IPV6_NOTRAFFIC     = 0x0002,
      NLM_CONNECTIVITY_IPV4_SUBNET        = 0x0010, 
      NLM_CONNECTIVITY_IPV4_LOCALNETWORK  = 0x0020,
      NLM_CONNECTIVITY_IPV4_INTERNET      = 0x0040, // 有網
      NLM_CONNECTIVITY_IPV6_SUBNET        = 0x0100,
      NLM_CONNECTIVITY_IPV6_LOCALNETWORK  = 0x0200,
      NLM_CONNECTIVITY_IPV6_INTERNET      = 0x0400
    } NLM_CONNECTIVITY;

    ConnectivityChanged: 0003 // 局域網，沒網 
    ConnectivityChanged: 0000 // 斷開鏈接
    ConnectivityChanged: 0042 // 局域網，能上網
    */
    virtual HRESULT STDMETHODCALLTYPE ConnectivityChanged(NLM_CONNECTIVITY newConnectivity)
    {

        printf("ConnectivityChanged: %04X\n", newConnectivity);
        return S_OK;
    }

    virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID riid, void **ppvObject)
    {
        HRESULT Result = S_OK;
        if (IsEqualIID(riid, IID_IUnknown))
        {
            *ppvObject = (IUnknown *)this;
        }
        else if (IsEqualIID(riid, IID_INetworkListManagerEvents))
        {
            *ppvObject = (INetworkListManagerEvents *)this;
        }
        else
        {
            Result = E_NOINTERFACE;
        }

        return Result;
    }

    virtual ULONG STDMETHODCALLTYPE AddRef(void)
    {
        return (ULONG)InterlockedIncrement(&m_ref);
    }

    virtual ULONG STDMETHODCALLTYPE Release(void)
    {
        LONG Result = InterlockedDecrement(&m_ref);
        if (Result == 0)
            delete this;
        return (ULONG)Result;
    }
private:
    LONG m_ref;
};

int main()
{
    CoInitialize(NULL);

    INetworkListManager *pNetworkListManager = NULL;
    HRESULT hr = CoCreateInstance(CLSID_NetworkListManager, NULL, CLSCTX_ALL, IID_INetworkListManager, (LPVOID *)&pNetworkListManager);
    printf("CLSID_NetworkListManager: %d\n", FAILED(hr));

    VARIANT_BOOL bConnected = VARIANT_FALSE;
    hr = pNetworkListManager->get_IsConnected(&bConnected);
    printf("is Connected: %d %d\n", bConnected, FAILED(hr));

    IConnectionPointContainer *pCPContainer = NULL;
    hr = pNetworkListManager->QueryInterface(IID_IConnectionPointContainer, (void**)&pCPContainer);
    IConnectionPoint *pConnectPoint = NULL;
    hr = pCPContainer->FindConnectionPoint(IID_INetworkListManagerEvents, &pConnectPoint);

    DWORD Cookie = 0;
    MyNetWorkEvent* pMyEvent = new MyNetWorkEvent();
    pConnectPoint->Advise((IUnknown*)pMyEvent, &Cookie);
    // 必須有下面這個消息循環
    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
        if ( msg.message == WM_QUIT )
        {
            break;
        }
    }
    pConnectPoint->Unadvise(Cookie);
    pConnectPoint->Release();

    pCPContainer->Release();     pNetworkListManager->Release();