参考：
C++中inet_pton、inet_ntop函数_Promising丶的博客-CSDN博客_c++ inet_ntop
‘inet_pton’ was not declared in this scope_无名_四叶草的博客-CSDN博客
linux下使用g++编译cpp工程 - BattleScars - 博客园
linux编译， 代码：
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
int main (void)
{
char IPdotdec[20]; //存放点分十进制IP地址
struct in_addr s; // IPv4地址结构体
// 输入IP地址
printf("Please input IP address: ");
scanf("%s", IPdotdec);
// 转换
inet_pton(AF_INET, IPdotdec, (void *)&s);
printf("inet_pton: 0x%x\n", s.s_addr); // 注意得到的字节序
// 反转换
inet_ntop(AF_INET, (void *)&s, IPdotdec, 16);
printf("inet_ntop: %s\n", IPdotdec);
}
执行结果：
[linux@ ip_address]$g++ main.cpp
[linux@ ip_address]$
[linux@ ip_address]$./a.out
Please input IP address: 1.1.1.1
inet_pton: 0x1010101
inet_ntop: 1.1.1.1
[linux@ ip_address]$./a.out
Please input IP address: 192.168.1.1
inet_pton: 0x101a8c0
inet_ntop: 192.168.1.1
[linux@ ip_address]$./a.out
Please input IP address: 2.2.2.2
inet_pton: 0x2020202
inet_ntop: 2.2.2.2增加字节序判断：
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
int isLittleEndian()
{
unsigned short i=1;
return (1 == *((char *)&i));
}
int printSystemEndian()
{
if(isLittleEndian())
{
printf("Low byte order\n");//低字节序
}
else
{
printf("High byte order\n");//高字节序
}
}
int main (void)
{
char IPdotdec[20]; //存放点分十进制IP地址
struct in_addr s; // IPv4地址结构体
// 输入IP地址
printf("Please input IP address: ");
scanf("%s", IPdotdec);
// 转换
inet_pton(AF_INET, IPdotdec, (void *)&s);
printf("inet_pton: 0x%x\n", s.s_addr); // 注意得到的字节序
// 反转换
inet_ntop(AF_INET, (void *)&s, IPdotdec, 16);
printf("inet_ntop: %s\n", IPdotdec);
printSystemEndian();
}
执行结果:
[linux@ ip_address]$g++ main.cpp -o main
[linux@ ip_address]$
[linux@ ip_address]$./main
Please input IP address: 192.168.1.1
inet_pton: 0x101a8c0
inet_ntop: 192.168.1.1
Low byte order
