最重要的是掌握UDP的基本概念和使用
UDP.h
#ifndef NETWORK_UDP_H
#define NETWORK_UDP_H
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <strings.h>
#include <string.h>
#include <stdlib.h>
#include <arpa/inet.h>
#include <pthread.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <ctype.h>
#endif
一切过程都在注释
service.c
#include "UDP.h"
#define SPORT 7788
char buf[1024];
int main(int argc ,char *argv[]){
int sockfd;
FILE *fp;
struct sockaddr_in s,c;
bzero(&s,sizeof(s));
s.sin_family=AF_INET;
s.sin_port=htons(SPORT);
s.sin_addr.s_addr=htonl(INADDR_ANY);
socklen_t len=sizeof(s);
if ((sockfd=socket(AF_INET,SOCK_DGRAM,0))==-1){
perror("[socket]");
return -1;
}
if ((bind(sockfd,(struct sockaddr *)&s,len))==-1){
perror("[bind]");
return -1;
}
int ret;
len=sizeof(c);
ret=recvfrom(sockfd,buf,sizeof(buf),0,(struct sockaddr *)&c,&len);
if (ret==-1){
perror("[recvfrom]");
return -1;
}
char filename[100];
int i=0,k=0;
for ( i = strlen(buf); i >0 ; i--) {
if (buf[i]!='/'){
k++;
} else
break;
}
strncat(filename,buf+(strlen(buf)-k)+1,k);
char filepath[100]="/tmp/";
strncat(filepath,filename,strlen(filename));
printf("FILE : %s will be download!\n",filepath);
fp=fopen(filepath,"w+");
if (fp==NULL){
perror("[fopen]");
return -1;
}
if ((truncate(filepath,1<<10))==-1){
perror("[truncate]");
return -1;
}
while (ret){
bzero(buf,sizeof(buf));
len=sizeof(c);
ret=recvfrom(sockfd,buf,sizeof(buf),0,(struct sockaddr *)&c,&len);
if ((fwrite(buf,sizeof(char),ret,fp))==-1){
perror("[fwrite]");
exit(-1);
}
}
printf("Download success!\n");
}
client.c
#include "UDP.h"
char buf[1024];
int main(int argc,char *argv[]){
int sockfd;
char filepath[100]="/home/jacky/hujie.txt";
struct sockaddr_in s;
bzero(&s,sizeof(s));
s.sin_family=AF_INET;
s.sin_port=htons(7788);
inet_pton(AF_INET,"192.168.200.134",&s.sin_addr.s_addr);
if ((sockfd=socket(AF_INET,SOCK_DGRAM,0))==-1){
perror("[socket]");
return -1;
}
int ret,ret_r;
if ((ret=sendto(sockfd,filepath,sizeof(filepath),0,(struct sockaddr *)&s,sizeof(s)))==-1){
perror("[sento]");
return -1;
}
FILE *fp;
fp=fopen(filepath,"r");
if (fp==NULL){
perror("[fopen]");
return -1;
}
while (ret){
bzero(buf,sizeof(buf));
ret_r=fread(buf,sizeof(char ),1024,fp);
if (ret_r==-1){
perror("[fread]");
return -1;
}
ret=sendto(sockfd,buf,strlen(buf),0,(struct sockaddr *)&s,sizeof(s));
usleep(100);
}
printf("transfer success\n");
}
实验结果
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