通过www.ip138.com获取本机外网ip以及所在地理位置

INT ip138_getinfo(LPSTR lpszIP, LPSTR lpszAddress)
{
//GET /ic.asp HTTP/1.1..
//Accept: */*..
//Referer: http://www.ip138.com/..
//Accept-Language: zh-cn..
//Accept-Encoding: gzip, deflate..
//User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; qihu theworld)..
//Host: iframe.ip138.com..
//Connection: Keep-Alive..
//Cookie: ASPSESSIONIDQASSDTAT=MAPFLNODFDJFDKHIMAKNMOEF; ASPSESSIONIDQCQTDTAT=AOADLNODBDEIAJLHMNHHIIFD; ASPSESSIONIDSCTTCSAS=FDJBLNODEGMLIJFJIBMKNCHP; ASPSESSIONIDQAQQBRCT=PKEELNODGBNOFKDEPIBIDEJM....
//
//HTTP/1.1 200 OK..
//Date: Wed, 11 Sep 2013 09:26:06 GMT..
//Server: Microsoft-IIS/6.0..
//X-Powered-By: ASP.NET..
//Content-Length: 228..
//Content-Type: text/html..
//Set-Cookie: ASPSESSIONIDSCRTCSBT=LDPOKNODEEGJLABMGGKCMNAJ; path=/..
//Cache-control: private....
//
//..
//..
//..
//........IP....[218.88.92.53] .................. ....

	int ret = 1;
	CInternetSession Session; 
	CHttpConnection* pServer = NULL;
	CHttpFile* pFile = NULL;

	CString strHeader = "Accept: */*\r\n";
	strHeader.Append("Referer: http://www.ip138.com/\r\n");
	strHeader.Append("Accept-Language: zh-cn\r\n");
	strHeader.Append("Accept-Encoding: gzip, deflate\r\n");
	strHeader.Append("User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)\r\n");


	CString strUrl;
	strUrl.Format("/ic.asp");

	pServer = Session.GetHttpConnection("iframe.ip138.com");
	pFile = pServer->OpenRequest(CHttpConnection::HTTP_VERB_GET,strUrl, NULL, 1, NULL, NULL, INTERNET_FLAG_KEEP_CONNECTION | INTERNET_FLAG_NO_COOKIES);
	pFile->AddRequestHeaders(strHeader);
	try{
		pFile->SendRequest();
	}
	catch(...){
		ret = -1;
	}

	CString strInfo;
	CString str;
	BYTE buffer[0x500] = { 0 };
	char info[0x500] = { 0 };
	int n = pFile->Read(buffer, 0x500);
	pFile->Close();
	delete pFile;

	strInfo = (LPCSTR)buffer;
	int i = strInfo.Find("[");
	if(i == -1) return 0;

	strInfo = strInfo.Right(strInfo.GetLength() - i - strlen("["));

	i = strInfo.Find("]");
	if(i == -1) return 0;

	str = strInfo.Left(i);
	strcpy_s(lpszIP, str.GetLength()+1, str);
	strInfo = strInfo.Right(strInfo.GetLength() - i - strlen("]"));

	i = strInfo.Find("：");
	if(i == -1) return 0;
	strInfo = strInfo.Right(strInfo.GetLength() - i - strlen("："));

	i = strInfo.Find("<");
	if(i == -1) return 0;
	str = strInfo.Left(i);
	strcpy_s(lpszAddress, str.GetLength()+1, str);

	return ret;
}

调用方式：

HMODULE hWebHelper = ::LoadLibrary("WebHelper.dll");

typedef DWORD (*_GetLocalHost) (LPSTR lpszIP, LPSTR lpszAddress);
_GetLocalHost GetLocalHost;

GetLocalHost = (_GetLocalHost)GetProcAddress(hWebHelper, "GetLocalHost");

char ip[0x20] = { 0 };
char addr[0x100] = { 0 };
int ret = GetLocalHost(ip, addr);