[C++]使用GetAdaptersAddresses API取得本地IP

GetAdaptersAddresses(AF_UNSPEC, 0, NULL, NULL, &outBufLen);

GetAdaptersAddresses(AF_UNSPEC, GAA_FLAG_SKIP_ANYCAST, NULL, pAddresses, &outBufLen);

pCurrAddresses = pAddresses;
while (pCurrAddresses) 
{
	if(pCurrAddresses->OperStatus != IfOperStatusUp)
	{
		pCurrAddresses = pCurrAddresses->Next;
		continue;
	}

	pUnicast = pCurrAddresses->FirstUnicastAddress;
	while (pUnicast)
	{				
		addr = pUnicast->Address.lpSockaddr;
		ZeroMemory(buff, bufflen);
		if (addr->sa_family == AF_INET6)  
		{
			sockaddr_in6 *sa_in6 = (sockaddr_in6 *)addr; 
			inet_ntop(AF_INET6, &(sa_in6->sin6_addr), buff, bufflen);
		}else
		{
			sockaddr_in  *sa_in = (sockaddr_in *)addr; 
			inet_ntop(AF_INET, &(sa_in->sin_addr), buff, bufflen);
		}
		localIPs.push_back(buff);
		pUnicast = pUnicast->Next;
	}

	pCurrAddresses = pCurrAddresses->Next;
}

free(pAddresses);  
...</pre>

#include “stdafx.h” #include <winsock2.h> #include <WS2tcpip.h>
#include <iphlpapi.h> #include <vector> #include <string> #include <algorithm>

// Link with Iphlpapi.lib #pragma comment(lib, “Ws2_32.lib”) #pragma comment(lib, “IPHLPAPI.lib”)

using namespace std;

vector<string> GetLocalIPs() { vector<string> localIPs; PIP_ADAPTER_ADDRESSES pAddresses = NULL;
ULONG outBufLen = 0;

GetAdaptersAddresses(AF_UNSPEC, 0, NULL, pAddresses, &outBufLen);  

pAddresses = (IP_ADAPTER_ADDRESSES*) malloc(outBufLen);  

if (GetAdaptersAddresses(AF_UNSPEC, GAA_FLAG_SKIP_ANYCAST, NULL, pAddresses, &outBufLen) != NO_ERROR) 
{
	free(pAddresses);  
	return localIPs;
}

char buff[100];  
DWORD bufflen=100;  
PIP_ADAPTER_ADDRESSES pCurrAddresses	= NULL;
PIP_ADAPTER_UNICAST_ADDRESS pUnicast	= NULL;
LPSOCKADDR addr							= NULL;

pCurrAddresses = pAddresses;
while (pCurrAddresses) 
{
	if(pCurrAddresses->OperStatus != IfOperStatusUp)
	{
		pCurrAddresses = pCurrAddresses->Next;
		continue;
	}

	pUnicast = pCurrAddresses->FirstUnicastAddress;
	while (pUnicast)
	{				
		addr = pUnicast->Address.lpSockaddr;
		ZeroMemory(buff, bufflen);
		if (addr->sa_family == AF_INET6)  
		{
			sockaddr_in6 *sa_in6 = (sockaddr_in6 *)addr; 
			inet_ntop(AF_INET6, &(sa_in6->sin6_addr), buff, bufflen);
		}else
		{
			sockaddr_in  *sa_in = (sockaddr_in *)addr; 
			inet_ntop(AF_INET, &(sa_in->sin_addr), buff, bufflen);
		}
		localIPs.push_back(buff);
		pUnicast = pUnicast->Next;
	}

	pCurrAddresses = pCurrAddresses->Next;
}

free(pAddresses);  
return localIPs;

}

int _tmain(int argc, _TCHAR* argv[]) { vector<string> localIPs = GetLocalIPs(); for_each (localIPs.begin(), localIPs.end(), [&](string ip) { char szTmp[255]; sprintf(szTmp, “%s “, ip.c_str()); printf(szTmp); }); return 0; }