WinSock之主機名字與IP地址查詢

查詢本機名字與IP地址

	struct hostent *hptr;
	char **pptr;
	char hostname[256];
	
	//獲取主機名字
	if (gethostname(hostname, sizeof(hostname))) {   
		cout << "獲取主機名字失敗！\n";
		WSACleanup();
		return 0;
	}
	cout << "hostname:" << hostname << endl;
	//獲取本機IP地址
	if ((hptr = gethostbyname(hostname)) == NULL) {  
		cout << "通過主機名獲取本機IP地址失敗！n" << endl;
		WSACleanup();
		return 0;
	}
	pptr = hptr->h_addr_list;
	cout << "host_ip:" << endl;
	while (*pptr != NULL) {
		//inet_ntoa:將一個包含在in_addr結構變量中的長整型IP地址轉換爲點分十進制形式
		cout << inet_ntoa(*(struct in_addr *)(*pptr)) << endl; pptr++;
	}

解析域名並輸出主機IP地址

	//解析域名
	cout << "輸入要解析的域名:" << endl;
	cin >> hostname;
	if ((hptr = gethostbyname(hostname)) == NULL) {
		cout << "域名解析失敗！\n" << endl;
		WSACleanup();
		return 0;
	}
	//輸出遠程機器IP地址
	pptr = hptr->h_addr_list;
	cout << "ip:" << endl;
	while (*pptr != NULL) {
		cout << inet_ntoa(*(struct in_addr *)(*pptr)) << endl; pptr++;
	}

全部代碼

#define _WINSOCK_DEPRECATED_NO_WARNINGS
#include "WinSock2.h"
#include "iostream"
#pragma comment(lib,"ws2_32.lib")  //鏈接WinSock導入庫
using namespace std;
int main(int argc, char **argv) {
	WSADATA wsaData;
	WORD wVersionRequested = MAKEWORD(2, 2);   //調用2.2版本
	if (WSAStartup(wVersionRequested, &wsaData) != 0) {   //加載WinSock動態鏈接庫
		cout << "加載WinSock DLL失敗！\n";
		return 0;
	}

	struct hostent *hptr;
	char **pptr;
	char hostname[256];
	
	//獲取主機名字
	if (gethostname(hostname, sizeof(hostname))) {   
		cout << "獲取主機名字失敗！\n";
		WSACleanup();
		return 0;
	}
	cout << "hostname:" << hostname << endl;
	//獲取本機IP地址
	if ((hptr = gethostbyname(hostname)) == NULL) {  
		cout << "通過主機名獲取本機IP地址失敗！n" << endl;
		WSACleanup();
		return 0;
	}
	pptr = hptr->h_addr_list;
	cout << "host_ip:" << endl;
	while (*pptr != NULL) {
		//inet_ntoa:將一個包含在in_addr結構變量中的長整型IP地址轉換爲點分十進制形式
		cout << inet_ntoa(*(struct in_addr *)(*pptr)) << endl; pptr++;
	}

	//解析域名
	cout << "輸入要解析的域名:" << endl;
	cin >> hostname;
	if ((hptr = gethostbyname(hostname)) == NULL) {
		cout << "域名解析失敗！\n" << endl;
		WSACleanup();
		return 0;
	}
	//輸出遠程機器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;
}