UDP是一種面向無連接的通信協議,最近學習了一下socket網絡編程,以下示例是基於UDP流協議實現的,需要的朋友可以參考下。
/*基於UDP的socket編程。服務器端
UDP適合用於一次傳送少量數據、對可靠性要求不高的應用環境。
TCP使用的是流套接字(SOCK_STREAM),UDP使用的是數據報套接字(SOCK_DGRAM)
2016-4-10
*/
#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 7000
#define BUFFER_SIZE 1024
int main()
{
//初始化UDP參數
struct sockaddr_in server_addr;
bzero(&server_addr,sizeof(server_addr)); //與memset功能類似
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
server_addr.sin_port=htons(SERVER_PORT);
//創建socket
int server_socket_fd = socket(AF_INET,SOCK_DGRAM,0);
if(server_socket_fd == -1)
{
perror("create socket failed\n");
exit(1);
}
//綁定套接字
if(-1 == (bind(server_socket_fd,(struct sockaddr*)&server_addr,sizeof(server_addr))))
{
perror("server bind failed!\n");
exit(1);
}
printf("--------waiting receive message----------\n");
//數據傳輸
while(1)
{
//定義一個地址,用於捕獲客戶端地址
struct sockaddr_in client_addr;
socklen_t client_addr_length = sizeof(client_addr);
//接收數據
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!\n");
exit(1);
}
printf("%s\n",buffer);
}
close(server_socket_fd);
return 0;
}
/*基於UDP的socket編程
客戶端流程
1、創建一個socket,用函數socket();
2、發送數據,用函數sendto();
3、關閉網絡連接
*/
#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 7000
#define BUFFER_SIZE 1024
int main()
{
//初始化參數
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"); //127.0.0.1是本機的迴環地址,主要用於測試。這個地址就代表電腦本身。
server_addr.sin_port=htons(SERVER_PORT);
//創建socket
int client_socket_fd =socket(AF_INET,SOCK_DGRAM,0);
if(client_socket_fd == -1)
{
perror("Create socket failed!\n");
exit(1);
}
//輸入文件名到緩衝區
char buffer[FILE_NAME_MAX_SIZE+1];
bzero(buffer,FILE_NAME_MAX_SIZE+1);
printf("please input message to server: ");
scanf("%s",buffer);
//發送文件名
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;
}
編譯過程:
測試過程: