网络编程之:IP的ULONG方式字符串方式的相互转化

// IpAndStr.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <WinSock2.h>
#include <Windows.h>
#include <iostream>
#include <string>
using namespace std;

#pragma comment(lib, "ws2_32.lib")

string GetIpFromULong(unsigned long uIp)
{
	in_addr addr;

	memcpy(&addr, &uIp, sizeof(uIp));

	string strIp = inet_ntoa(addr);

	return strIp;
}


int main(int aargc, char* argv[])
{
	in_addr addr1;
	unsigned long uIp = 0;

	uIp = inet_addr("127.0.0.1");
	memcpy(&addr1, &uIp, sizeof(uIp));

	//cout << "strip = " << inet_ntoa(addr1) << endl;

	string strIp = GetIpFromULong(uIp);

	cout << "cur ip = " << strIp.c_str() << endl;

/*	struct in_addr addr1,addr2;
	unsigned long l1,l2;

	l1 = inet_addr("192.168.0.74");
	l2 = inet_addr("211.100.21.179");
	memcpy(&addr1, &l1, 4);
	memcpy(&addr2, &l2, 4);
	printf("%s : %s\n", inet_ntoa(addr1), inet_ntoa(addr2)); //注意这一句的运行结果
	printf("%s\n", inet_ntoa(addr1));
	printf("%s\n", inet_ntoa(addr2));*/

	return 0;
}