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\n", 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:\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;
} |