Concept utilising file transfer from client to server

[parita]

hey,
i have designed a code linking the server and the client. my purpose is to transfer a file from server as desired by the client. the code for client side is as under:-

<br /> #include <stdio.h><br /> #include <sys/types.h><br /> #include <sys/socket.h><br /> #include <netinet/in.h><br /> #include <netdb.h><br /> #include <string.h><br /> #include <stdlib.h><br /> #include <fstream.h><br /> #include <iostream.h><br /> int main(int argc, char *argv[])<br /> {<br />     int sockfd, portno,n;<br />     struct sockaddr_in serv_addr;<br />     struct hostent *server;<br />     char buffer[256];<br />     if (argc < 3) {<br />        fprintf(stderr,"usage %s hostname portn", argv[0]);<br />        exit(0);<br />     }<br />     portno = atoi(argv[2]);<br />     sockfd = socket(AF_INET, SOCK_STREAM, 0);<br />     if (sockfd < 0)<br />         ("ERROR opening socket");<br />     server = gethostbyname(argv[1]);<br />     if (server == NULL) {<br />         fprintf(stderr,"ERROR, no such hostn");<br />         exit(0);<br />     }<br />     bzero((char *) &#038;serv_addr, sizeof(serv_addr));<br />     serv_addr.sin_family = AF_INET;<br />     bcopy((char *)server->h_addr,<br />          (char *)&#038;serv_addr.sin_addr.s_addr,<br />          server->h_length);<br />     serv_addr.sin_port = htons(portno);<br />     if (connect(sockfd,(struct sockaddr *)&#038;serv_addr,sizeof(serv_addr)) < 0)<br />         ("ERROR connecting");<br /> n = recv(sockfd,buffer,255,0);<br /> printf("the list of files:%sn",buffer);<br />     printf("Please enter the file no:");<br />     bzero(buffer,256);<br />     fgets(buffer,255,stdin);<br />     n = send(sockfd,buffer,strlen(buffer),0);<br />     if (n < 0)<br />          ("ERROR writing to socket");<br />     bzero(buffer,256);<br />     n = recv(sockfd,buffer,255,0);<br />     if (n < 0)<br />          ("ERROR reading from socket");<br />     printf("%sn",buffer);<br /> fstream fout;<br /> fout.open("d.txt",ios::out);<br /> n=recv(sockfd,buffer,255,0);<br /> printf("content of buffer:%sn",buffer);<br /> if (n < 0)<br />  printf("ERROR reading from socket");<br /> char write(sockfd,buffer, sizeof(buffer));<br /> fout.close();<br /> return 0;<br /> }<br />

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<br /> #include <stdio.h><br /> #include <sys/types.h><br /> #include <sys/socket.h><br /> #include <netinet/in.h><br /> #include <netdb.h><br /> #include <string.h><br /> #include <stdlib.h><br /> #include <fstream.h><br /> #include <iostream.h><br /> int main(int argc, char *argv[])<br /> {<br />     int sockfd, portno,n;<br />     struct sockaddr_in serv_addr;<br />     struct hostent *server;<br />     char buffer[256];<br />     if (argc < 3) {<br />        fprintf(stderr,"usage %s hostname portn", argv[0]);<br />        exit(0);<br />     }<br />     portno = atoi(argv[2]);<br />     sockfd = socket(AF_INET, SOCK_STREAM, 0);<br />     if (sockfd < 0)<br />         ("ERROR opening socket");<br />     server = gethostbyname(argv[1]);<br />     if (server == NULL) {<br />         fprintf(stderr,"ERROR, no such hostn");<br />         exit(0);<br />     }<br />     bzero((char *) &#038;serv_addr, sizeof(serv_addr));<br />     serv_addr.sin_family = AF_INET;<br />     bcopy((char *)server->h_addr,<br />          (char *)&#038;serv_addr.sin_addr.s_addr,<br />          server->h_length);<br />     serv_addr.sin_port = htons(portno);<br />     if (connect(sockfd,(struct sockaddr *)&#038;serv_addr,sizeof(serv_addr)) < 0)<br />         ("ERROR connecting");<br /> n = recv(sockfd,buffer,255,0);<br /> printf("the list of files:%sn",buffer);<br />     printf("Please enter the file no:");<br />     bzero(buffer,256);<br />     fgets(buffer,255,stdin);<br />     n = send(sockfd,buffer,strlen(buffer),0);<br />     if (n < 0)<br />          ("ERROR writing to socket");<br />     bzero(buffer,256);<br />     n = recv(sockfd,buffer,255,0);<br />     if (n < 0)<br />          ("ERROR reading from socket");<br />     printf("%sn",buffer);<br /> fstream fout;<br /> fout.open("d.txt",ios::out);<br /> n=recv(sockfd,buffer,255,0);<br /> printf("content of buffer:%sn",buffer);<br /> if (n < 0)<br />  printf("ERROR reading from socket");<br /> char write(sockfd,buffer, sizeof(buffer));<br /> fout.close();<br /> return 0;<br /> }<br />

the code for server side is as under:-
 

/* A simple server in the internet domain using TCP<br /> The port number is passed as an argument */<br /> #include <iostream.h><br /> #include <stdio.h><br /> #include <sys/types.h><br /> #include <sys/socket.h><br /> #include <netinet/in.h><br /> #include <stdlib.h><br /> #include <string.h><br /> #include <fstream.h><br /> int main(int argc, char *argv[])<br /> {<br /> const int N=80;<br /> char line [N];   <br />  int sockfd, newsockfd, portno, clilen;<br /> char *ch;<br />      struct sockaddr_in serv_addr, cli_addr;<br /> char buffer[256];<br />      int n;<br />      if (argc < 2) {<br />          fprintf(stderr,"ERROR, no port providedn");<br />          exit(1);<br />      }<br />      sockfd = socket(AF_INET, SOCK_STREAM, 0);<br />      if (sockfd < 0)<br />         ("ERROR opening socket");<br />      bzero((char *) &#038;serv_addr, sizeof(serv_addr));<br />      portno = atoi(argv[1]);<br />      serv_addr.sin_family = AF_INET;<br />      serv_addr.sin_addr.s_addr = INADDR_ANY;<br />      serv_addr.sin_port = htons(portno);<br />      if (bind(sockfd, (struct sockaddr *) &#038;serv_addr,<br />               sizeof(serv_addr)) < 0)<br />               ("ERROR on binding");<br />      listen(sockfd,5);<br />      clilen = sizeof(cli_addr);<br />      newsockfd = accept(sockfd,<br />                  (struct sockaddr *) &#038;cli_addr,(socklen_t *)&#038;clilen);<br />      if (newsockfd < 0)<br />           ("ERROR on accept");<br /> n=send(newsockfd,"here is the list of files:1 for ankur.txt,2 for a.txt,3 for b.txt",255,0);   <br />      bzero(buffer,256);<br />       n = recv(newsockfd,buffer,255,0);<br />      if (n < 0) ("ERROR reading from socket");<br />      printf("Here is the message: %cn",buffer[0]);<br /> //ch=buffer;<br /> switch (buffer[0])<br /> {<br /> case '1':  <br />  {  n=send(newsockfd,"file exists",18,0);<br />                ifstream fin;<br />              fin.open("ankur.txt");<br />         while(fin)<br />                {<br />                 fin.getline(line,N);<br />              printf("Read line is :%sn",line);<br />                n=send(newsockfd,line,sizeof(line),0);<br />   }fin.close();<br />       if (n < 0)<br />   {<br />   printf("ERROR writing to socket");<br />        return 0;<br />   }<br />    }<br />  break;<br /> <br /> case '2':    {  n=send(newsockfd,"file exists",18,0);<br />               <br />                ifstream fin;<br />              fin.open("a.txt");<br />         while(fin)<br />                {<br />                 fin.getline(line,N);<br />              printf("Read line is :%sn",line);<br />                n=send(newsockfd,line,sizeof(line),0);<br />   <br />   }fin.close();<br />      if (n < 0) ("ERROR writing to socket");<br />      return 0;<br />   }break;<br /> case '3':{  n=send(newsockfd,"file exists",18,0);<br />           <br />                ifstream fin;<br />              fin.open("b.txt");<br />         while(fin)<br />                {<br />                 fin.getline(line,N);<br />              printf("Read line is :%sn",line);<br />                n=send(newsockfd,line,sizeof(line),0);<br />              <br />   }fin.close();<br />      if (n < 0) ("ERROR writing to socket");<br />      return 0;<br />   }break;<br /> default:<br /> { n = send(newsockfd,"file doesnot exists",18,0);<br />      }break;<br />  <br /> }<br /> }

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/* A simple server in the internet domain using TCP<br /> The port number is passed as an argument */<br /> #include <iostream.h><br /> #include <stdio.h><br /> #include <sys/types.h><br /> #include <sys/socket.h><br /> #include <netinet/in.h><br /> #include <stdlib.h><br /> #include <string.h><br /> #include <fstream.h><br /> int main(int argc, char *argv[])<br /> {<br /> const int N=80;<br /> char line [N];   <br />  int sockfd, newsockfd, portno, clilen;<br /> char *ch;<br />      struct sockaddr_in serv_addr, cli_addr;<br /> char buffer[256];<br />      int n;<br />      if (argc < 2) {<br />          fprintf(stderr,"ERROR, no port providedn");<br />          exit(1);<br />      }<br />      sockfd = socket(AF_INET, SOCK_STREAM, 0);<br />      if (sockfd < 0)<br />         ("ERROR opening socket");<br />      bzero((char *) &#038;serv_addr, sizeof(serv_addr));<br />      portno = atoi(argv[1]);<br />      serv_addr.sin_family = AF_INET;<br />      serv_addr.sin_addr.s_addr = INADDR_ANY;<br />      serv_addr.sin_port = htons(portno);<br />      if (bind(sockfd, (struct sockaddr *) &#038;serv_addr,<br />               sizeof(serv_addr)) < 0)<br />               ("ERROR on binding");<br />      listen(sockfd,5);<br />      clilen = sizeof(cli_addr);<br />      newsockfd = accept(sockfd,<br />                  (struct sockaddr *) &#038;cli_addr,(socklen_t *)&#038;clilen);<br />      if (newsockfd < 0)<br />           ("ERROR on accept");<br /> n=send(newsockfd,"here is the list of files:1 for ankur.txt,2 for a.txt,3 for b.txt",255,0);   <br />      bzero(buffer,256);<br />       n = recv(newsockfd,buffer,255,0);<br />      if (n < 0) ("ERROR reading from socket");<br />      printf("Here is the message: %cn",buffer[0]);<br /> //ch=buffer;<br /> switch (buffer[0])<br /> {<br /> case '1':  <br />  {  n=send(newsockfd,"file exists",18,0);<br />                ifstream fin;<br />              fin.open("ankur.txt");<br />         while(fin)<br />                {<br />                 fin.getline(line,N);<br />              printf("Read line is :%sn",line);<br />                n=send(newsockfd,line,sizeof(line),0);<br />   }fin.close();<br />       if (n < 0)<br />   {<br />   printf("ERROR writing to socket");<br />        return 0;<br />   }<br />    }<br />  break;<br /> <br /> case '2':    {  n=send(newsockfd,"file exists",18,0);<br />               <br />                ifstream fin;<br />              fin.open("a.txt");<br />         while(fin)<br />                {<br />                 fin.getline(line,N);<br />              printf("Read line is :%sn",line);<br />                n=send(newsockfd,line,sizeof(line),0);<br />   <br />   }fin.close();<br />      if (n < 0) ("ERROR writing to socket");<br />      return 0;<br />   }break;<br /> case '3':{  n=send(newsockfd,"file exists",18,0);<br />           <br />                ifstream fin;<br />              fin.open("b.txt");<br />         while(fin)<br />                {<br />                 fin.getline(line,N);<br />              printf("Read line is :%sn",line);<br />                n=send(newsockfd,line,sizeof(line),0);<br />              <br />   }fin.close();<br />      if (n < 0) ("ERROR writing to socket");<br />      return 0;<br />   }break;<br /> default:<br /> { n = send(newsockfd,"file doesnot exists",18,0);<br />      }break;<br />  <br /> }<br /> }

But, i am not able to accomplish the task.
Please help me with ur assistance.

[MonicaLoche]

I guess there is ERROR writing to socket because you might need some socket initialization.

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