代码笔记 | UDP编程实现

来源：互联网发布：英雄联盟单机版mac 编辑：程序博客网时间：2024/06/06 02:48
 /********** server.***********/#include<sys/types.h> #include<sys/socket.h> #include<unistd.h> #include<netinet/in.h> #include<arpa/inet.h> #include<stdio.h> #include<stdlib.h> #include<errno.h> #include<netdb.h> #include<stdarg.h> #include<string.h>     #define SERVER_PORT 8000 #define BUFFER_SIZE 1024 #define FILE_NAME_MAX_SIZE 512     int main() {      /* 创建UDP套接口 */     struct sockaddr_in server_addr;      bzero(&server_addr, sizeof(server_addr));      server_addr.sin_family = AF_INET;      server_addr.sin_addr.s_addr = htonl(INADDR_ANY);      server_addr.sin_port = htons(SERVER_PORT);              /* 创建socket */     int server_socket_fd = socket(AF_INET, SOCK_DGRAM, 0);      if(server_socket_fd == -1)      {           perror("Create Socket Failed:");           exit(1);      }              /* 绑定套接口 */     if(-1 == (bind(server_socket_fd,(struct sockaddr*)&server_addr,sizeof(server_addr))))      {          perror("Server Bind Failed:");          exit(1);      }              /* 数据传输 */     while(1)      {            /* 定义一个地址，用于捕获客户端地址 */          struct sockaddr_in client_addr;           socklen_t client_addr_length = sizeof(client_addr);                       /* 接收数据 */          char buffer[BUFFER_SIZE];           bzero(buffer, BUFFER_SIZE);           if(recvfrom(server_socket_fd, buffer, BUFFER_SIZE,0,(struct sockaddr*)&client_addr, &client_addr_length) == -1)           {            perror("Receive Data Failed:");            exit(1);           }                       /* 从buffer中拷贝出file_name */          char file_name[FILE_NAME_MAX_SIZE+1];           bzero(file_name,FILE_NAME_MAX_SIZE+1);           strncpy(file_name, buffer, strlen(buffer)>FILE_NAME_MAX_SIZE?FILE_NAME_MAX_SIZE:strlen(buffer));           printf("%s\\n", file_name);      }             close(server_socket_fd);      return 0; }   /***********client.c ************/#include<sys/types.h> #include<sys/socket.h> #include<unistd.h> #include<netinet/in.h> #include<arpa/inet.h> #include<stdio.h> #include<stdlib.h> #include<errno.h> #include<netdb.h> #include<stdarg.h> #include<string.h>     #define SERVER_PORT 8000 #define BUFFER_SIZE 1024 #define FILE_NAME_MAX_SIZE 512     int main() {      /* 服务端地址 */     struct sockaddr_in server_addr;      bzero(&server_addr, sizeof(server_addr));      server_addr.sin_family = AF_INET;      server_addr.sin_addr.s_addr = inet_addr("127.0.0.1");      server_addr.sin_port = htons(SERVER_PORT);              /* 创建socket */     int client_socket_fd = socket(AF_INET, SOCK_DGRAM, 0);      if(client_socket_fd < 0)      {           perror("Create Socket Failed:");           exit(1);      }              /* 输入文件名到缓冲区 */     char file_name[FILE_NAME_MAX_SIZE+1];      bzero(file_name, FILE_NAME_MAX_SIZE+1);      printf("Please Input File Name On Server:\\t");      scanf("%s", file_name);              char buffer[BUFFER_SIZE];      bzero(buffer, BUFFER_SIZE);      strncpy(buffer, file_name, strlen(file_name)>BUFFER_SIZE?BUFFER_SIZE:strlen(file_name));              /* 发送文件名 */     if(sendto(client_socket_fd, buffer, BUFFER_SIZE,0,(struct sockaddr*)&server_addr,sizeof(server_addr)) < 0)      {           perror("Send File Name Failed:");           exit(1);      }              close(client_socket_fd);      return 0; }
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