獲取本機IP地址 C/C++

在cmd中可以看到自己電腦正在使用的IP地址，如果有多個網卡，比如虛擬網卡就會有多個IP地址。

先來看看怎麼得到正在使用的IP地址：

#define _WINSOCK_DEPRECATED_NO_WARNINGS
#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<WinSock2.h>
#pragma comment(lib,"ws2_32.lib")  //調用winsock函數的依賴庫

// 獲取當前IP
void getIp(char *ip)
{
	if (WSAStartup(MAKEWORD(2, 2), &WSADATA()) != 0)
	{
		printf("套接字庫加載失敗！\n");
		return;
	}

	struct hostent * host = gethostbyname("");
	if (host == NULL)
	{
		printf("獲取 IP地址失敗！\n");
		return;
	}

	char *p = inet_ntoa(*(struct in_addr*)(*host->h_addr_list));
	strncpy(ip,p,strlen(p));

	WSACleanup();
}

int main()
{
	char ip[20] = {0};

	getIp(ip);

	printf("%s\n",ip);

	system("pause");
	return 0;
}

獲取所有的IP地址：

#define _WINSOCK_DEPRECATED_NO_WARNINGS
#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<WinSock2.h>
#pragma comment(lib,"ws2_32.lib")  //調用winsock函數的依賴庫


//  獲取所有IP
void getAIps(char ip[][20])
{
	if (WSAStartup(MAKEWORD(2, 2), &WSADATA()) != 0)
	{
		printf("套接字庫加載失敗！\n");
		return;
	}

	struct hostent * host = gethostbyname("");
	if (host == NULL)
	{
		printf("獲取 IP地址失敗！\n");
		return;
	}

	int i = 0;
	while(host->h_addr_list[i] != NULL)
	{
		char *p = inet_ntoa(*(struct in_addr*)(host->h_addr_list[i]));
		strncpy(*ip++, p, strlen(p));
		i++;
	}
	

	WSACleanup();
}

int main()
{
	char allIp[10][20];
	memset(allIp, 0, sizeof(allIp));

	getAIps(allIp);
	for (int i = 0; allIp[i][0] != '\0'; i++)
	{
		printf("%s\n", allIp[i]);
	}
	system("pause");
	return 0;
}