win32獲取本機公網IP地址

//獲取公網ip
#include <urlmon.h>
#pragma comment(lib, "urlmon.lib")
 
#ifdef _UNICODE
#define tString std::wstring
#else
#define tString std::string
#endif
 
//----------獲取客戶端公網IP-----------//
tString GetIP()
{
	TCHAR szPath[MAX_PATH] = { 0 };
	TCHAR szRead[128] = { 0 };
 
	char szSite[] = "http://www.3322.org/dyndns/getip";
 
	GetTempPath(MAX_PATH, szPath);
	_tcscat_s(szPath, 256, _T("get_ip.txt"));
 
	if (URLDownloadToFile(0, szSite, szPath, 0, 0) == S_OK)
	{
		FILE *fIpHtm;
 
		if (fopen_s(&fIpHtm, szPath, "r") == S_OK && fIpHtm)
		{
			fgets(szRead, 128, fIpHtm);
		}
	}
 
	return tString(szRead);
}
 
 
int _tmain(int argc, _TCHAR* argv[])
{
	_tprintf(_T("\nget net ip!\n"));
	_tprintf(_T("%s\n"), GetIP().c_str());
 
	getchar();
 
	return 0;
}