Linux下網絡編程文件傳送問題

我用的就是下面的代碼，就是不行，這就是我組合的，不知道哪裏出問題了，請高手指點。謝謝！foreverxun.

//server.c

#include<stdlib.h>#include<stdio.h>#include<sys/types.h>#include<netdb.h>#include<errno.h>

#define MYPORT 12000#define BACKLOG 2#define MAXSIZE 4096

int b_link(int port){

int sockfd,ret,len,con_fd; struct sockaddr_in ser_addr;int nsize;

sockfd=socket(AF_INET,SOCK_STREAM,0);//建立壹個ip/tcp套接口

if(sockfd<0){ printf("error in building a socket\n\a");return -1;}

ser_addr.sin_family=AF_INET;

ser_addr.sin_port=htons(port);

ser_addr.sin_addr.s_addr=htonl(INADDR_ANY);

bzero(&(ser_addr.sin_zero),8);

ret=bind(sockfd,(struct sockaddr *)&ser_addr,sizeof(struct sockaddr));//端口綁定

if(ret<0) {printf("error in binding port\n\a");return -1;}

ret=listen(sockfd,10);//端口監聽.簡單起見,只接受壹個請求

if(ret<0){printf("error in listening \n\a");return -1;}

return sockfd;}

int b_access(int sockfd,char *buffn)//接受服務請求,接收文件

{

int con_fd;struct sockaddr_in cli_addr;int sin_size;sin_size=sizeof(struct sockaddr_in);

con_fd=accept(sockfd,(struct sockadd*)&cli_addr,&sin_size);//接受請求

if(con_fd<0){printf("error in accepting \n\a");close(sockfd);return -1;}

printf("client %s connect.......\n",inet_ntoa(*(struct sockaddr_in *)&cli_addr.sin_addr.s_addr));

int numbytes;

if((numbytes=recv(con_fd, buffn, 50, 0)) == -1){perror ( " recv " ) ;exit ( 1 ) ;return 0;}

printf("buffn content is %s .......\n",buffn);

char buf[MAXSIZE];FILE *File;int nsize;

File=fopen(buffn,"w");//打開壹個文件用來保存傳送的文件

if(File==NULL){ printf("error in creating conserve file %s \n\a",buf);close(sockfd); return -1;}

else printf("the file is stored in %s.....\n",buffn);

fflush(NULL);

while((nsize=recv(con_fd,buf,MAXSIZE,0))!=0)//接收文件

fwrite(buf,1,nsize,File); close(sockfd);//關閉套接口

return 1; }

int main(){

int sockfd,sockfdfn;

char buffn[50];

sockfd=b_link(MYPORT);

if(b_access(sockfd,buffn)>0)printf("file accept end \n\a");

else { printf("file accept failed \n\a");return 0;}

return 1;}

//client.c

#include<sys/types.h>#include<sys/socket.h>#include<netdb.h>#include<string.h>

#include<stdlib.h>#include<stdio.h>#define MAXSIZE 8096#define MYPORT 12000

int b_connect(char *hostname,int mp){

int sockfd,ret,len;struct sockaddr_in ser_addr;char *myname;struct hostent *sh;struct in_addr *addrs;

if((sh=gethostbyname(hostname))==NULL){

if((sh=gethostbyaddr(hostname,4,AF_INET))==NULL){printf("the host name couldn't be expressed \n\a");return -1;}}

printf("connecting to %s ......\n",inet_ntoa(*(struct sockaddr *)sh->h_addr_list[0]));

addrs=(struct in_addr *)sh->h_addr_list[0];

sockfd=socket(AF_INET,SOCK_STREAM,0);//創建壹個套接口

if(sockfd<0){printf("error in building socket \n\a");return -1;}

ser_addr.sin_family=AF_INET;//協議ip/tcp

ser_addr.sin_port=htons(mp);//主機監聽端口,轉換成網絡數字形式

memcpy(&(ser_addr.sin_addr.s_addr),addrs,sizeof(struct in_addr));//主機ip地址,網絡數字形式

bzero(&(ser_addr.sin_zero),8);

ret=connect(sockfd,(struct sockaddr *)&ser_addr,sizeof(struct sockaddr));//與主機建立連接

if(ret<0){printf("error in conneting \n\a");return -1;}

return sockfd;};

int f_send(int sockfd,char *fs){

if (send(sockfd,fs,50,0) == -1){perror( " send fname error " );return 0;}

else printf("file name transfers succussly! \n\a");

FILE *File;int nsize;int i=0;char temp[MAXSIZE];char buf[MAXSIZE];

File=fopen(fs,"r");//打開要傳送的文件

if(File==NULL){printf("file: %s open failed!.....\n",fs);return -1; }

while((nsize=fread(buf,1,MAXSIZE,File))>0){send(sockfd,buf,nsize,0);}

if(feof(File)!=0)printf("file transfers succussly!\n%d",strlen(buf));

else printf("error in reading file \n\a");

fclose(File);close(sockfd);return 1;

};

int main(void){

int sockfd,sockfdfn;char hostname[100];char file[100];

printf("please input the hostname(ip) you want to connect:");

fflush(NULL);gets(hostname);

printf("connect success!\nplease input the filename you want to transfer:");

gets(file);fflush(NULL);

sockfd=b_connect(hostname,12000);

if(sockfd<=0) return -1;

return f_send(sockfd,file);}

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