vista以及更高版本操作系统网络状态实时检测方法

    今天有项目需求，需要实时检测网络连接状态，起码要做的和QQ微信差不多，根据网络上以及MSDN提供的一些API，比如InternetGetConnectedState和IsNetworkAlive均没有达到预期效果，或者是有各种各样的问题，比如说API  InternetGetConnectedState，这个API就有延时的问题，亲测我的机器延时为5秒，而IsNetworkAlive仅仅只能检测到网线连接，但是不能检测到网络连通，只能抛弃这两个函数。通过不断google和翻看MSDN，终于找到一个实现，即实现Network List manager(NLM)的相关方法和回调即可。

首先，从INetworkListManagerEvents派生一个类，并实现相关COM接口函数

#pragma once#include <atlcom.h>#include <netlistmgr.h>#include <netlistmgr.h>class NetworkEventHandler : public INetworkListManagerEvents{public:NetworkEventHandler(void);virtual ~NetworkEventHandler(void);STDMETHODIMP QueryInterface (REFIID riid, void** pIFace);STDMETHODIMP_(ULONG) AddRef();STDMETHODIMP_(ULONG) Release();STDMETHODIMP ConnectivityChanged(NLM_CONNECTIVITY NewConnectivity);private:long m_lRefCnt;};

cpp:

NetworkEventHandler::NetworkEventHandler(void) : m_lRefCnt(0){}NetworkEventHandler::~NetworkEventHandler(void){}STDMETHODIMP NetworkEventHandler::QueryInterface(REFIID refIID, void** pIFace){*pIFace = NULL;if(refIID == IID_IUnknown || refIID == __uuidof(INetworkListManagerEvents)){*pIFace =  (IUnknown*)(INetworkListManagerEvents*)(this);}if (*pIFace == NULL){return E_NOINTERFACE;}((IUnknown*)*pIFace)->AddRef();return S_OK;}STDMETHODIMP_(ULONG) NetworkEventHandler::AddRef(){m_lRefCnt++;return m_lRefCnt;}STDMETHODIMP_(ULONG) NetworkEventHandler::Release(){m_lRefCnt--;if(m_lRefCnt == 0) {delete this;return (0);}return m_lRefCnt;}STDMETHODIMP  NetworkEventHandler :: ConnectivityChanged( NLM_CONNECTIVITY NewConnectivity){bool bInternet = false;if((NewConnectivity & NLM_CONNECTIVITY_IPV4_INTERNET) || (NewConnectivity & NLM_CONNECTIVITY_IPV6_INTERNET)){bInternet = true;//网络已经连通，做点啥事}else{//网络已经不通，做点啥事}return S_OK;}

然后注册相关事件即可，

定义

CComPtr<INetworkListManager> m_pNLM;NetworkEventHandler * m_pSink;

DWORD m_dwCookie;

注册：

m_pNLM.CoCreateInstance(CLSID_NetworkListManager);m_pSink = new NetworkEventHandler();if (SUCCEEDED (m_pSink->QueryInterface(IID_IUnknown, (void**) &m_pSink))){    AfxConnectionAdvise (m_pNLM, __uuidof(INetworkListManagerEvents), m_pSink, FALSE, &m_dwCookie); // Advising for Events}

最后程序结束，释放：

AfxConnectionUnadvise (m_pNLM, IID_INetworkListManagerEvents, m_pSink, FALSE, m_dwCookie);m_pSink->Release();

当网络连接状态改变时，ConnectivityChanged就会收到通知了

好好学习，天天向上