UDP套接字编程范例：
server端代码如下：
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/************************************************************************* > 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
", file_name); } close(server_socket_fd); return 0; } |
client端代码如下：
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/************************************************************************* > 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: "); 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; } |