利用socket实现聊天c++

### C++ Socket 实现聊天程序 #### 创建服务器端代码 为了创建一个简单的基于Socket的聊天应用程序，在C++中需要先设置服务器端。服务器负责监听客户端连接请求并处理消息传递。 ```cpp #include <iostream> #include <cstring> #include <sys/socket.h> #include <netinet/in.h> #include <unistd.h> #define PORT 8080 int main() { int server_fd, new_socket; struct sockaddr_in address; int opt = 1; int addrlen = sizeof(address); char buffer[1024] = {0}; const char *hello = "Hello from server"; // Creating socket file descriptor if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0) { perror("socket failed"); exit(EXIT_FAILURE); } // Forcefully attaching socket to the port 8080 if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &opt, sizeof(opt))) { perror("setsockopt"); exit(EXIT_FAILURE); } address.sin_family = AF_INET; address.sin_addr.s_addr = INADDR_ANY; address.sin_port = htons(PORT); // Forcefully attaching socket to the port 8080 if (bind(server_fd, (struct sockaddr *)&address, sizeof(address))<0) { perror("bind failed"); exit(EXIT_FAILURE); } if (listen(server_fd, 3) < 0) { perror("listen"); exit(EXIT_FAILURE); } if ((new_socket = accept(server_fd, (struct sockaddr *)&address, (socklen_t*)&addrlen))<0) { perror("accept"); exit(EXIT_FAILURE); } read(new_socket , buffer, 1024); std::cout << "Message received from client: " << buffer << std::endl; send(new_socket , hello , strlen(hello) , 0 ); printf("Hello message sent\n"); return 0; } ``` 这段代码展示了如何初始化套接字，绑定到特定地址和端口，并等待来自客户端的消息[^1]。 #### 客户端代码实现 接下来是客户端部分，它会尝试连接至上述服务器，并发送一条测试信息给对方： ```cpp #include <iostream> #include <cstring> #include <sys/socket.h> #include <arpa/inet.h> #include <unistd.h> #define PORT 8080 int main() { struct sockaddr_in serv_addr; int sock = 0; char buffer[1024] = {0}; const char *hello = "Hello from client"; if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) { std::cerr << "\n Socket creation error \n"; return -1; } serv_addr.sin_family = AF_INET; serv_addr.sin_port = htons(PORT); // Convert IPv4 and IPv6 addresses from text to binary form. if(inet_pton(AF_INET, "127.0.0.1", &serv_addr.sin_addr)<=0){ std::cerr << "\nInvalid address/ Address not supported \n"; return -1; } if (connect(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) { std::cerr << "\nConnection Failed \n"; return -1; } send(sock, hello, strlen(hello), 0); std::cout << "Hello message sent\n"; read( sock , buffer, 1024); std::cout << "Server response: " << buffer << std::endl; return 0; } ``` 此段代码说明了怎样建立与远程主机（即上面定义的服务端）之间的TCP连接，并向其发出问候语句[^2]。 通过以上两部分代码，可以构建起基本的一问一答式的简单聊天室模型。当然这只是一个非常基础的例子，实际应用中的即时通讯软件通常还需要考虑更多因素如并发处理、安全性等问题[^3]。