C/ VC++语言获取本机IP地址

绝地灬酷狼 2023-06-11 08:25 2阅读 0赞

#### 获取本机所有IP地址 ####

#include <winsock2.h>
    #include <ws2tcpip.h>
    #include <stdlib.h>
    #include <stdio.h>
    
    #pragma comment (lib, "Ws2_32.lib")
    
    void get_host_ip()
    { 
    	WSADATA WSAData;
    	if (WSAStartup(MAKEWORD(2, 2), &WSAData) != 0)
    	{ 
    		printf("WSAStartup() error!\n");
    		return;
    	}
    	int ret;
    	struct addrinfo hints;
    	struct addrinfo *res, *cur;
    	struct sockaddr_in *addr;
    	char m_ipaddr[16];
    
    	memset(&hints, 0, sizeof(struct addrinfo));
    	hints.ai_family = AF_INET;     /* Allow IPv4 */
    	hints.ai_flags = AI_PASSIVE;/* For wildcard IP address */
    	hints.ai_protocol = 0;         /* Any protocol */
    	hints.ai_socktype = SOCK_DGRAM;
    
    	ret = getaddrinfo("", NULL, &hints, &res);
    
    	if (ret == -1) { 
    		perror("getaddrinfo");
    		exit(1);
    	}
    	for (cur = res; cur != NULL; cur = cur->ai_next) { 
    		addr = (struct sockaddr_in *)cur->ai_addr;
    		sprintf_s(m_ipaddr, 16, "%d.%d.%d.%d",
    			(*addr).sin_addr.S_un.S_un_b.s_b1,
    			(*addr).sin_addr.S_un.S_un_b.s_b2,
    			(*addr).sin_addr.S_un.S_un_b.s_b3,
    			(*addr).sin_addr.S_un.S_un_b.s_b4);
    		printf("%s\n", m_ipaddr);
    	}
    	freeaddrinfo(res);
    	WSACleanup();
    }
    
    int  main(int argc, char **argv)
    { 
    	get_host_ip();
    	system("pause");
    	return 0;
    }

参阅百度百科 “getaddrinfo（)”

VC++获取本机地址

//m_sock为CSocket类对象
    void CChatApp::InitInfo()
    { 
    	if (!m_sock.Create(UPORT, SOCK_DGRAM))
    	{ 
    		AfxMessageBox(_T("端口创建失败！"));
    		return;
    	}
    	//获取设备名称
    	SInfo& info = m_info;
    	gethostname(info.sHost, sizeof(info.sHost));
    	//获取本机IP地址
    	ADDRINFOA hints;
    	ADDRINFOA* result;
    	ZeroMemory(&hints, sizeof(ADDRINFO));
    	hints.ai_family = AF_INET;
    	hints.ai_protocol = 0;
    	hints.ai_flags = AI_PASSIVE;
    	hints.ai_socktype = SOCK_DGRAM;
    	int res = GetAddrInfo(info.sHost, NULL, &hints, &result);
    	SOCKADDR_IN* addr = (SOCKADDR_IN*)result->ai_addr;
    	IN_ADDR* ad = (IN_ADDR*)&addr->sin_addr;
    	inet_ntop(result->ai_family, ad, info.sIP, sizeof(info.sIP));
    	//获取用户名
    	DWORD dw = sizeof(info.sName);
    	GetUserName(info.sName, &dw);
    
    	//以255结尾的IP地址是虚拟IP，用于网段内群发数据
    	CString sIP(info.sIP);
    	int i = sIP.ReverseFind('.');
    	sIP = sIP.Left(i + 1) + _T("255");
    	SPack pack = {  SEND_HELLO };
    	memcpy(pack.data, &info, sizeof(info));
    	m_sock.SendTo(&pack, sizeof(info) + sizeof(int), UPORT, sIP);
    }