WinSock之主机名字与IP地址查询

查询本机名字与IP地址

	struct hostent *hptr;
	char **pptr;
	char hostname[256];
	
	//获取主机名字
	if (gethostname(hostname, sizeof(hostname))) {   
		cout << "获取主机名字失败！\n";
		WSACleanup();
		return 0;
	}
	cout << "hostname:" << hostname << endl;
	//获取本机IP地址
	if ((hptr = gethostbyname(hostname)) == NULL) {  
		cout << "通过主机名获取本机IP地址失败！n" << endl;
		WSACleanup();
		return 0;
	}
	pptr = hptr->h_addr_list;
	cout << "host_ip:" << endl;
	while (*pptr != NULL) {
		//inet_ntoa:将一个包含在in_addr结构变量中的长整型IP地址转换为点分十进制形式
		cout << inet_ntoa(*(struct in_addr *)(*pptr)) << endl; pptr++;
	}

解析域名并输出主机IP地址

	//解析域名
	cout << "输入要解析的域名:" << endl;
	cin >> hostname;
	if ((hptr = gethostbyname(hostname)) == NULL) {
		cout << "域名解析失败！\n" << endl;
		WSACleanup();
		return 0;
	}
	//输出远程机器IP地址
	pptr = hptr->h_addr_list;
	cout << "ip:" << endl;
	while (*pptr != NULL) {
		cout << inet_ntoa(*(struct in_addr *)(*pptr)) << endl; pptr++;
	}

全部代码

#define _WINSOCK_DEPRECATED_NO_WARNINGS
#include "WinSock2.h"
#include "iostream"
#pragma comment(lib,"ws2_32.lib")  //链接WinSock导入库
using namespace std;
int main(int argc, char **argv) {
	WSADATA wsaData;
	WORD wVersionRequested = MAKEWORD(2, 2);   //调用2.2版本
	if (WSAStartup(wVersionRequested, &wsaData) != 0) {   //加载WinSock动态链接库
		cout << "加载WinSock DLL失败！\n";
		return 0;
	}

	struct hostent *hptr;
	char **pptr;
	char hostname[256];
	
	//获取主机名字
	if (gethostname(hostname, sizeof(hostname))) {   
		cout << "获取主机名字失败！\n";
		WSACleanup();
		return 0;
	}
	cout << "hostname:" << hostname << endl;
	//获取本机IP地址
	if ((hptr = gethostbyname(hostname)) == NULL) {  
		cout << "通过主机名获取本机IP地址失败！n" << endl;
		WSACleanup();
		return 0;
	}
	pptr = hptr->h_addr_list;
	cout << "host_ip:" << endl;
	while (*pptr != NULL) {
		//inet_ntoa:将一个包含在in_addr结构变量中的长整型IP地址转换为点分十进制形式
		cout << inet_ntoa(*(struct in_addr *)(*pptr)) << endl; pptr++;
	}

	//解析域名
	cout << "输入要解析的域名:" << endl;
	cin >> hostname;
	if ((hptr = gethostbyname(hostname)) == NULL) {
		cout << "域名解析失败！\n" << endl;
		WSACleanup();
		return 0;
	}
	//输出远程机器IP地址
	pptr = hptr->h_addr_list;
	cout << "ip:" << endl;
	while (*pptr != NULL) {
		cout << inet_ntoa(*(struct in_addr *)(*pptr)) << endl; pptr++;
	}
	WSACleanup();
	return 0;
}