网络编程之:IP的ULONG方式字符串方式的相互转化

网络编程之:IP的ULONG方式字符串方式的相互转化

Cpp代码

// 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;

}