根據計算機名獲取該計算機的所有IP

1. 工程中添加命令行參數

2. 代碼

#include "stdafx.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

//socket編程

#include "Winsock2.h"
#pragma comment(lib, "Ws2_32.lib")  

 
#include "ws2tcpip.h"   // 注意位置

int main(int argc, char **argv)
{
//調用任何socket函數前必須調用WSAStartup （it initiates use of WS2_32.DLL by a process）
WSADATA wsaData;
if (WSAStartup(MAKEWORD(2,2),&wsaData) != 0){ 
fprintf(stderr,"WSAStartup failed: %d\n",GetLastError()); 
ExitProcess(-1); 
} 

if (argc != 2) {
fprintf(stderr, "Usage: %s hostname\n",
argv[1]);
exit(1);   
}

struct addrinfo *answer, hint, *curr;
memset(&hint,0, sizeof(hint));
hint.ai_family = AF_INET;
hint.ai_socktype = SOCK_STREAM;
int ret = getaddrinfo(argv[1], NULL, &hint, &answer);
if (ret != 0) {
fprintf(stderr,"getaddrinfo: %s\n",
gai_strerror(ret));
exit(1);
}
char * dest_ip;
for (curr = answer; curr != NULL; curr = curr->ai_next) {

 dest_ip = inet_ntoa((((struct sockaddr_in *)(curr->ai_addr))->sin_addr));
 fprintf(stdout,"ip: %s\n",dest_ip);
}
freeaddrinfo(answer);

WSACleanup();
system("pause");
exit(0);
}

結果：

添加多個IP的方法：