首先,我将分享的代码是我的代码的基础(在另一个站点,开源中找到它),我稍后添加了函数和线程来改进。
在办公室,我们有本地网络,另外3台电脑无法连接到我的服务器。特别是看看那条线。 26010是我想听的随机端口号。根据我在其他主题中找到的数据,NULL和127.0.0.1是localhost ip.I尝试了我自己的ip号而不是NULL,但它没有工作。我可以将客户端代码中的数据发送到其他计算机,但无法获得任何连接。
代码是正确的侦听连接,如果我打开另一个3终端并尝试通过我的客户端代码从我的计算机连接它,则可以获取信息。如何解决?
提前致谢。
status = getaddrinfo(NULL," 26010",& host_info,& host_info_list);
int main()
{
int status;
struct addrinfo host_info; // The struct that getaddrinfo() fills up with data.
struct addrinfo *host_info_list; // Pointer to the to the linked list of host_info's.
memset(&host_info, 0, sizeof host_info);
std::cout << "Setting up the structs..." << std::endl;
host_info.ai_family = AF_UNSPEC; // IP version not specified. Can be both.
host_info.ai_socktype = SOCK_STREAM; // Use SOCK_STREAM for TCP or SOCK_DGRAM for UDP.
host_info.ai_flags = AI_PASSIVE;
**status = getaddrinfo(NULL, "26010", &host_info, &host_info_list);**
// getaddrinfo returns 0 on succes, or some other value when an error occured.
// (translated into human readable text by the gai_gai_strerror function).
if (status != 0) std::cout << "getaddrinfo error" << gai_strerror(status) ;
std::cout << "Creating a socket..." << std::endl;
int socketfd ; // The socket descripter
socketfd = socket(host_info_list->ai_family, host_info_list->ai_socktype,
host_info_list->ai_protocol);
if (socketfd == -1) std::cout << "socket error " ;
std::cout << "Binding socket..." << std::endl;
int yes = 1;
status = setsockopt(socketfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int));
status = bind(socketfd, host_info_list->ai_addr, host_info_list->ai_addrlen);
if (status == -1) std::cout << "bind error" << std::endl ;
std::cout << "Listen()ing for connections..." << std::endl;
status = listen(socketfd, 5);
if (status == -1) std::cout << "listen error" << std::endl ;
int new_sd;
struct sockaddr_storage their_addr;
socklen_t addr_size = sizeof(their_addr);
new_sd = accept(socketfd, (struct sockaddr *)&their_addr, &addr_size);
if (new_sd == -1)
{
std::cout << "listen error" << std::endl ;
}
else
{
std::cout << "Connection accepted. Using new socketfd : " << new_sd << std::endl;
}
std::cout << "Waiting to recieve data..." << std::endl;
ssize_t bytes_recieved;
char incomming_data_buffer[1000];
bytes_recieved = recv(new_sd, incomming_data_buffer,1000, 0);
// If no data arrives, the program will just wait here until some data arrives.
...
std::cout << "send()ing back a message..." << std::endl;
return 0 ;
}
答案 0 :(得分:1)
您的问题是致电getaddrinfo()
。此函数返回host_info_list
成员中的信息。您正在阅读的内容是host_info
未更改的提示(getaddrinfo()
)。您需要使用host_info_list
来读取getaddrinfo返回的内容。你永远不会使用它而你永远不会释放它(通过调用freeaddrinfo
)。
我不确定您为什么要使用getaddrinfo()
来监听连接。你可以自己建立sockaddr。这很简单:
struct sockaddr_in listenAddr;
memset(&listenAddr, 0, sizeof(listenAddr));
/* IPv4 address */
listenAddr.sin_family = AF_INET;
/* your port number */
listenAddr.sin_port = htons(26010);
/* listen on all interfaces */
listenAddr.sin_addr.s_addr = htonl(INADDR_ANY);
/* TCP socket */
socketfd = socket(PF_INET, SOCK_STREAM, 0);
/* your error code, omitted here */
status = bind(SocketFD,(struct sockaddr *) &listenAddr, sizeof(listenAddr))