以下是一个简单的TCP消息封装示例，使用C语言实现：
c复制代码
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#define SERVER_PORT 8080
#define MAX_BUFFER_SIZE 1024
int main() {
int server_fd, new_socket;
struct sockaddr_in address;
int opt = 1;
int addrlen = sizeof(address);
char buffer[MAX_BUFFER_SIZE] = {0};
char *hello = "Hello from server";
// 创建socket文件描述符
if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0) {
perror("socket failed");
exit(EXIT_FAILURE);
}
// 设置socket选项
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(SERVER_PORT);
// 绑定socket到服务器地址和端口号
if (bind(server_fd, (struct sockaddr *)&address, sizeof(address)) < 0) {
perror("bind failed");
exit(EXIT_FAILURE);
}
// 监听socket连接请求
if (listen(server_fd, 3) < 0) {
perror("listen");
exit(EXIT_FAILURE);
}
printf("Listening on port %d...\n", SERVER_PORT);
// 接受客户端连接请求并发送欢迎消息
if ((new_socket = accept(server_fd, (struct sockaddr *)&address, (socklen_t*)&addrlen)) < 0) {
perror("accept");
exit(EXIT_FAILURE);
}
printf("Connected to client at address %s:%d\n", inet_ntoa(address.sin_addr), ntohs(address.sin_port));
// 向客户端发送欢迎消息和问候消息
c语言struct用法例子send(new_socket, hello, strlen(hello), 0);
send(new_socket, buffer, strlen(buffer), 0);
printf("Message sent to client: %s\n", hello);
printf("Message sent to client: %s\n", buffer);
return 0;
}

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