c++如何获取本机ip

要在C++中获取本机IP地址，可以使用如下方法：

#include <iostream> #include <string> #include <winsock2.h> #include <ws2tcpip.h>  #pragma comment(lib, "ws2_32.lib")  int main() {     WSADATA wsaData;     if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {         std::cerr << "WSAStartup failed" << std::endl;         return 1;     }      char hostname[256];     if (gethostname(hostname, sizeof(hostname)) == SOCKET_ERROR) {         std::cerr << "Error getting hostname" << std::endl;         WSACleanup();         return 1;     }      struct addrinfo* result = NULL;     struct addrinfo hints;      ZeroMemory(&hints, sizeof(hints));     hints.ai_family = AF_INET;     hints.ai_socktype = SOCK_STREAM;     hints.ai_protocol = IPPROTO_TCP;      if (getaddrinfo(hostname, NULL, &hints, &result) != 0) {         std::cerr << "Error getting address info" << std::endl;         WSACleanup();         return 1;     }      struct sockaddr_in* addr = (struct sockaddr_in*) result->ai_addr;     char ip[INET_ADDRSTRLEN];     inet_ntop(AF_INET, &addr->sin_addr, ip, sizeof(ip));      std::cout << "Hostname: " << hostname << std::endl;     std::cout << "IP Address: " << ip << std::endl;      freeaddrinfo(result);     WSACleanup();      return 0; } 

这段代码首先初始化Winsock库，然后使用gethostname函数获取本地主机名，接着使用getaddrinfo函数获取主机地址信息，最后通过inet_ntop函数将sockaddr_in结构体中的IP地址转换为字符串格式并输出。