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【C】文件传输
作者:tb_engineer / 发布于2014/9/20/ 439

	#include <stdio.h>
	#include <stdlib.h>
	#include <unistd.h>
	#include <string.h>
	#include <sys/types.h>
	#include <sys/stat.h>
	#include <sys/socket.h>
	#include <netinet/in.h>
	
	#define PORT 6000
	#define LISTENQ 20
	#define BUFFSIZE 4096
	#define FILE_NAME_MAX_SIZE 512
	
	int main(int argc, char **argv[])
	{
	 //Input the file name
	 char filename[FILE_NAME_MAX_SIZE];
	 bzero(filename,FILE_NAME_MAX_SIZE);
	 printf("Please input the file name you wana to send:");
	 scanf("%s",&filename);
	 getchar();
	
	 //Create socket
	 int sockfd,connfd;
	 struct sockaddr_in svraddr,clientaddr;
	 bzero(&svraddr,sizeof(svraddr));
	
	 svraddr.sin_family=AF_INET;
	 svraddr.sin_addr.s_addr=htonl(INADDR_ANY);
	 svraddr.sin_port=htons(PORT);
	
	 sockfd=socket(AF_INET,SOCK_STREAM,0);
	 if(sockfd<0)
	 {
	 perror("socket");
	 exit(1);
	 }
	
	 //bind
	 if(bind(sockfd,(struct sockaddr*)&svraddr,sizeof(svraddr))<0)
	 {
	 perror("bind");
	 exit(1);
	 }
	
	 //listen
	 if(listen(sockfd,LISTENQ)<0)
	 {
	 perror("listen");
	 exit(1);
	 }
	
	 while(1)
	 {
	 socklen_t length=sizeof(clientaddr);
	
	 //accept
	 connfd=accept(sockfd,(struct sockaddr*)&clientaddr,&length);
	 if(connfd<0)
	 {
	 perror("connect");
	 exit(1);
	 }
	
	 //send file imformation
	 char buff[BUFFSIZE];
	 int count;
	 bzero(buff,BUFFSIZE);
	 strncpy(buff,filename,strlen(filename)>FILE_NAME_MAX_SIZE?FILE_NAME_MAX_SIZE:strlen(filename));
	 printf("buff=[%s]\n",buff);
	 count=send(connfd,buff,BUFFSIZE,0);
	 if(count<0)
	 {
	 perror("Send file imformation");
	 exit(1);
	 }
	
	 //read file
	 FILE *fd=fopen(filename,"rb");
	 if(fd==NULL)
	 {
	 printf("File :%s not found!\n",filename);
	 }
	 else
	 {
	 bzero(buff,BUFFSIZE);
	 int file_block_length=0;
	 while((file_block_length=fread(buff,sizeof(char),BUFFSIZE,fd))>0)
	 {
	 printf("file_block_length:%d\n",file_block_length);
	 if(send(connfd,buff,file_block_length,0)<0)
	 {
	 perror("Send");
	 exit(1);
	 }
	 bzero(buff,BUFFSIZE);
	 }
	 fclose(fd);
	 printf("Transfer file finished !\n");
	 }
	 close(connfd);
	 }
	 close(sockfd);
	 return 0;
	}
	
	
	
	client.c
	
	
	#include <stdio.h>
	#include <stdlib.h>
	#include <unistd.h>
	#include <string.h>
	#include <sys/types.h>
	#include <sys/stat.h>
	#include <sys/socket.h>
	#include <netinet/in.h>
	
	#define PORT 6000
	#define LISTENQ 20
	#define BUFFSIZE 4096
	#define FILE_NAME_MAX_SIZE 512
	
	
	int main(int argc, char **argv[])
	{
	 int clientfd;
	 if(argc!=2)
	 {
	 fprintf(stderr,"Usage:./fileclient <IP_Address>\n");
	 exit(1);
	 }
	 struct sockaddr_in clientaddr;
	 bzero(&clientaddr,sizeof(clientaddr));
	
	 clientaddr.sin_family=AF_INET;
	 clientaddr.sin_addr.s_addr=htons(INADDR_ANY);
	 clientaddr.sin_port=htons(0);
	
	 clientfd=socket(AF_INET,SOCK_STREAM,0);
	
	 if(clientfd<0)
	 {
	 perror("socket");
	 exit(1);
	 }
	
	 if(bind(clientfd,(struct sockaddr*)&clientaddr,sizeof(clientaddr))<0)
	 {
	 perror("bind");
	 exit(1);
	 }
	
	 struct sockaddr_in svraddr;
	 bzero(&svraddr,sizeof(svraddr));
	 if(inet_aton(argv[1],&svraddr.sin_addr)==0)
	 {
	 perror("inet_aton");
	 exit(1);
	 }
	 svraddr.sin_family=AF_INET;
	 svraddr.sin_port=htons(PORT);
	
	 socklen_t svraddrlen=sizeof(svraddr);
	 if(connect(clientfd,(struct sockaddr*)&svraddr,svraddrlen)<0)
	 {
	 perror("connect");
	 exit(1);
	 }
	
	 //recv file imformation
	 char buff[BUFFSIZE];
	 char filename[FILE_NAME_MAX_SIZE];
	 int count;
	 bzero(buff,BUFFSIZE);
	
	 count=recv(clientfd,buff,BUFFSIZE,0);
	 if(count<0)
	 {
	 perror("recv");
	 exit(1);
	 }
	 strncpy(filename,buff,strlen(buff)>FILE_NAME_MAX_SIZE?FILE_NAME_MAX_SIZE:strlen(buff));
	
	 printf("Preparing recv file : %s from %s \n",filename,argv[1]);
	
	 //recv file
	 FILE *fd=fopen(filename,"wb+");
	 if(NULL==fd)
	 {
	 perror("open");
	 exit(1);
	 }
	 bzero(buff,BUFFSIZE);
	
	 int length=0;
	 while(length=recv(clientfd,buff,BUFFSIZE,0))
	 {
	 if(length<0)
	 {
	 perror("recv");
	 exit(1);
	 }
	 int writelen=fwrite(buff,sizeof(char),length,fd);
	 if(writelen<length)
	 {
	 perror("write");
	 exit(1);
	 }
	 bzero(buff,BUFFSIZE);
	 }
	 printf("Receieved file:%s from %s finished!\n",filename,argv[1]);
	 fclose(fd);
	 close(clientfd);
	 return 0;
	}
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