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UNIX Client and Server

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UNIX Client and Server

 
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  #1
Nov 29th, 2008
Hello

How to send a file from server to client.

I am a bigger in C with unix, i am trying to read a file from server and display it in client , i got a separate code to read a file , and i tried to connect the server and client with the following code is working fine only it shows a warning.

I am using the sample code from the follosing site
http://www2.ics.hawaii.edu/~esb/2003...cs651/hw1.html

the connection is working fine , but i dont know how to add the sending and receving code in to it and the text reading code in to that code...

if any one can help me , It would be much appreciated. Thank You for reading.


file reading code i am using is as fallows.

#include <stdio.h>

int main ( void )
{
static const char filename[] = "file.txt";
FILE *file = fopen ( filename, "r" );
if ( file != NULL )
{
char line [ 128 ]; /* or other suitable maximum line size */

while ( fgets ( line, sizeof line, file ) != NULL ) /* read a line */
{
fputs ( line, stdout ); /* write the line */
}
fclose ( file );
}
else
{
perror ( filename ); /* why didn't the file open? */
}
return 0;
}


Thank u
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Re: UNIX Client and Server

 
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  #2
Nov 29th, 2008
This isnt an intro. Moved to the C board.
If i am helpful, please give me reputation points.
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Re: UNIX Client and Server

 
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  #3
Nov 29th, 2008
Hi

I can't get you... What does it mean move to c board.
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Re: UNIX Client and Server

 
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Nov 29th, 2008
It was originally posted in the board which is for welcoming new members, so I moved it to the C programming language board, as it is indeed a question about C programming.
If i am helpful, please give me reputation points.
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Re: UNIX Client and Server

 
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  #5
Nov 29th, 2008
Thank You.
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Re: UNIX Client and Server

 
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  #6
Dec 2nd, 2008
I'm no expert in socket programming, but i think these functions might be of some use.
C Syntax (Toggle Plain Text) 
  1. send() to send data
  2. recv() to receive data
Hope i helped.
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Re: UNIX Client and Server

 
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  #7
Dec 2nd, 2008
Hi thank u for the reply.

I got changed the code to following , now i am able to send a file from server to client . That means send A from server and Save as B in client.


Server code

C Syntax (Toggle Plain Text) 
  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4. #include <unistd.h>
  5. #include <arpa/inet.h>
  6. #include <sys/types.h>
  7. #include <netinet/in.h>
  8. #include <sys/socket.h>
  9.  
  10. #define PORTNUM 1995
  11.  
  12. int main(int argc, char *argv[])
  13. {
  14.  
  15.     int mysocket, consocket, socksize;
  16.     struct sockaddr_in dest;
  17.     struct sockaddr_in serv;
  18.     socksize = sizeof(struct sockaddr_in);
  19.     memset(&dest, 0, sizeof(dest));
  20.     serv.sin_family = AF_INET;
  21.     serv.sin_addr.s_addr = INADDR_ANY;
  22.     serv.sin_port = htons(PORTNUM);
  23.     mysocket = socket(AF_INET, SOCK_STREAM, 0);
  24.     bind(mysocket, (struct sockaddr *)&serv, sizeof(struct sockaddr));
  25.     listen(mysocket, 1);
  26.     int i= 0;
  27.  
  28.     char buf[50];
  29.     consocket = accept(mysocket, (struct sockaddr *)&dest, &socksize);
  30. while(1)
  31. {
  32.     /*consocket = accept(mysocket, (struct sockaddr *)&dest, &socksize);*/
  33.     printf("Incoming connection from %s - sending welcome\n", inet_ntoa(dest.sin_addr));
  34.     printf("\n\nClient Connected,\n\nFile Send Successfully\n\n");
  35.     FILE* fp = fopen("server.txt","r");
  36.     while(!feof(fp))
  37.     {
  38.  
  39.         bzero(buf,sizeof(buf));
  40.         fread(buf,sizeof(char),50,fp);
  41.         write(consocket,buf,50);
  42.     }
  43.     write(consocket ,"quit1234",50);
  44.     fclose(fp);
  45.     return 0;
  46. }
  47. }

Client Code

C Syntax (Toggle Plain Text) 
  1.  
  2. #include <stdio.h>
  3. #include <stdlib.h>
  4. #include <string.h>
  5. #include <unistd.h>
  6. #include <arpa/inet.h>
  7. #include <sys/types.h>
  8. #include <netinet/in.h>
  9. #include <sys/socket.h>
  10.  
  11. #define MAXRCVLEN 500
  12. #define PORTNUM 1995
  13.  
  14. int main(int argc, char *argv[])
  15. {
  16.  
  17.     int mysocket,n;
  18.     struct sockaddr_in dest;
  19.     mysocket = socket(AF_INET, SOCK_STREAM, 0);
  20.     memset(&dest, 0, sizeof(dest));
  21.     dest.sin_family = AF_INET;
  22.     dest.sin_addr.s_addr = inet_addr("127.0.0.1");
  23.     dest.sin_port = htons(PORTNUM);
  24.     connect(mysocket, (struct sockaddr *)&dest, sizeof(struct sockaddr));
  25.     printf("\n\n CLIENT CONNECTED\n\nFile Received Successfully...\n\n");
  26.     char buf[50];
  27.     FILE* fp = fopen("client.txt","w");
  28.     while(1)
  29.          {
  30.              bzero(buf,sizeof(buf));
  31.              read(mysocket,buf,50);
  32.              if(strcmp(buf,"quit1234")==0)
  33.                 {
  34.                 break;
  35.                 }
  36.              fprintf(fp,"%s",buf);
  37.         }
  38.  
  39.     fclose(fp);
  40. }


Now i am trying to read B and display in client , for that i changed the following code and inserted it in to the client code but it say file is alread open..... so i am not able to display the B in client.

What is the point in code i am missing out , how to cahge the following code to display the file B in client.

C Syntax (Toggle Plain Text) 
  1. static const char filename[] = "file.txt";
  2. FILE *file = fopen ( filename, "r" );
  3. if ( file != NULL )
  4. {
  5. char line [ 128 ]; /* or other suitable maximum line size */
  6.  
  7. while ( fgets ( line, sizeof line, file ) != NULL ) /* read a line */
  8.   {
  9.   fputs ( line, stdout ); /* write the line */
  10.   }
  11. fclose ( file );
  12. }
  13. else
  14. {
  15. perror ( filename ); /* why didn't the file open? */
  16. }
  17. return 0;
  18. }

Thank You for readying.
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