c - 使用 Inet_aton 接受命令行参数错误

Question

我正在尝试根据给定的命令行参数初始化套接字，argv1 是 ip，argv2 是端口。端口可以​​根据需要工作，但创建 IP 地址是问题。预期输入为 ./client.out 10.5.10.20 88888这是客户端，服务器端创建端口号成功。

    // Socket information
    char ipadd[255];
    strcpy(ipadd,argv[1]);
    int portval = atoi(argv[2]);
    struct sockaddr_in server_info, client_info;
    int s_addrlen = sizeof(server_info);
    int c_addrlen = sizeof(client_info);
    memset(&server_info, 0, s_addrlen);
    memset(&client_info, 0, c_addrlen);
    server_info.sin_family = PF_INET;
    server_info.sin_addr.s_addr = inet_aton(argv[1], &server_info);
    server_info.sin_port = htons(portval);

编译时我收到警告

expected ‘struct in_addr *’ but argument is of type ‘struct sockaddr_in *’
 extern int inet_aton (const char *__cp, struct in_addr *__inp) __THROW;

Answer 1

这是对我有用的解决方案

char ipadd[255];
    strcpy(ipadd,argv[1]);
    int portval = atoi(argv[2]);
    struct sockaddr_in server_info, client_info;
    int s_addrlen = sizeof(server_info);
    int c_addrlen = sizeof(client_info);
    memset(&server_info, 0, s_addrlen);
    memset(&client_info, 0, c_addrlen);
    server_info.sin_family = PF_INET;
    server_info.sin_addr.s_addr = htonl(INADDR_ANY);
    inet_aton(argv[1], &server_info.sin_addr);
    server_info.sin_port = htons(portval);