C程式設計之基於UDP的網路通訊
阿新 • • 發佈：2019-02-07
/*
* udp-c.c
* Author: Alvin
* 基於UDP的客戶端程式碼
* 功能:向伺服器傳送內容，並接收來自服務端的回覆
*
*/
#include <stdio.h>
#include <string.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <stdlib.h>
#define MYPORT 6768
#define BUFSIZE 20
int main(int
{
if (argc != 3)
{
printf("\nUsing: ./udp-c IP string\n");
printf("\tThe length of the string should not bigger than 20.\n\n");
exit(0);
}
int sockfd;
int new_fd,numbytes,ret;
struct sockaddr_in udp_addr;
struct sockaddr_in
int their_addr_len=sizeof(their_addr);
int sin_size,con_fd,pid;
int buflen;
char recive[BUFSIZE];
sockfd=socket(AF_INET,SOCK_DGRAM,0);
if(sockfd<0)
{
printf("error in socket");
exit(1);
}
udp_addr.
udp_addr.sin_port=htons(MYPORT);
udp_addr.sin_addr.s_addr=inet_addr(argv[1]);
buflen=strlen(argv[2]);
while(1)
{
ret = sendto(sockfd,argv[2],buflen,0,(struct sockaddr*)&udp_addr,sizeof(udp_addr));
if(ret<0)
{
printf("error recive\n");
exit(1);
}
printf("UDP client sent:%s\n",argv[2]);
sleep(1);
ret = recvfrom(sockfd,recive,BUFSIZE,0,(struct sockaddr*)&their_addr,&their_addr_len);
if(ret<0)
{
printf("error recive\n");
exit(1);
}
recive[ret]='\0';
printf("UDP client recive:%s\n",recive);
}
return 0;
}
* udp-c.c
* Author: Alvin
* 基於UDP的客戶端程式碼
* 功能:向伺服器傳送內容，並接收來自服務端的回覆
*
*/
#include <stdio.h>
#include <string.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <stdlib.h>
#define MYPORT 6768
#define BUFSIZE 20
int main(int
{
if (argc != 3)
{
printf("\nUsing: ./udp-c IP string\n");
printf("\tThe length of the string should not bigger than 20.\n\n");
exit(0);
}
int sockfd;
int new_fd,numbytes,ret;
struct sockaddr_in udp_addr;
struct sockaddr_in
int their_addr_len=sizeof(their_addr);
int sin_size,con_fd,pid;
int buflen;
char recive[BUFSIZE];
sockfd=socket(AF_INET,SOCK_DGRAM,0);
if(sockfd<0)
{
printf("error in socket");
exit(1);
}
udp_addr.
udp_addr.sin_port=htons(MYPORT);
udp_addr.sin_addr.s_addr=inet_addr(argv[1]);
buflen=strlen(argv[2]);
while(1)
{
ret = sendto(sockfd,argv[2],buflen,0,(struct sockaddr*)&udp_addr,sizeof(udp_addr));
if(ret<0)
{
printf("error recive\n");
exit(1);
}
printf("UDP client sent:%s\n",argv[2]);
sleep(1);
ret = recvfrom(sockfd,recive,BUFSIZE,0,(struct sockaddr*)&their_addr,&their_addr_len);
if(ret<0)
{
printf("error recive\n");
exit(1);
}
recive[ret]='\0';
printf("UDP client recive:%s\n",recive);
}
return 0;
}