linux中c语言使用udp协议接收结构体

下面是使用 C 语言在 Linux 中使用 UDP 协议接收结构体的示例代码：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>

#define PORT 12345
#define BUF_SIZE 1024

struct my_struct {
  int a;
  char b[10];
  double c;
};

int main(int argc, char *argv[]) {
  int sockfd;
  struct sockaddr_in server_addr;
  struct sockaddr_in client_addr;
  socklen_t client_addr_len;
  ssize_t recv_len;
  struct my_struct recv_struct;

  // 创建套接字
  sockfd = socket(AF_INET, SOCK_DGRAM, 0);
  if (sockfd < 0) {
    perror("socket");
    exit(EXIT_FAILURE);
  }

  // 绑定套接字
  memset(&server_addr, 0, sizeof(server_addr));
  server_addr.sin_family = AF_INET;
  server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
  server_addr.sin_port = htons(PORT);
  if (bind(sockfd, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
    perror("bind");
    close(sockfd);
    exit(EXIT_FAILURE);
  }

  while (1) {
    // 接收数据
    client_addr_len = sizeof(client_addr);
    recv_len = recvfrom(sockfd, &recv_struct, sizeof(recv_struct), 0, (struct sockaddr *)&client_addr, &client_addr_len);
    if (recv_len < 0) {
      perror("recvfrom");
      close(sockfd);
      exit(EXIT_FAILURE);
    }

    // 打印接收到的结构体
    printf("Received struct: a = %d, b = %s, c = %f\n", recv_struct.a, recv_struct.b, recv_struct.c);
  }

  close(sockfd);
  return 0;
}

上面的代码创建了一个 UDP 套接字，并绑定到本地的 PORT 端口，然后不断接收数据并打印出来。