网络编程笔记4

来源：互联网发布：2016年天猫双十一数据编辑：程序博客网时间：2024/05/18 18:19

UDP套接字编程范例：

*************************************************************************  > File Name: server.c  > Author: SongLee  ************************************************************************/#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端代码如下：

/*************************************************************************  > File Name: client.c  > Author: SongLee  ************************************************************************/#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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