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POc socket programming, Error in receiving a line
 

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  1. POc socket programming, Error in receiving a line
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    <p>I have modified a code of simple chat program using Socket programming in C.My problem is that i have to enter two lines at either server or client to receive only one line by the other.I have uploaded an image to explain more. Any help is appreciated </p> <pre><code>SERVER #include &lt;stdio.h&gt; #include &lt;sys/types.h&gt; #include&lt;sys/socket.h&gt; #include&lt;netinet/in.h&gt; #include&lt;stdlib.h&gt; #include&lt;strings.h&gt; #include&lt;unistd.h&gt; #define SERVER_TCP_PORT 3000 #define BUFLEN 256 int main (int argc,char **argv) { int n,bytes_to_read; int sd,new_sd,client_len,port; struct sockaddr_in server,client; char *bp,buf[BUFLEN]; switch (argc) { case 1: port = SERVER_TCP_PORT; break; case 2: port = atoi (argv[1]); break; default: fprintf (stderr,"Usage: %s[port]\n",argv[0]); exit(1); } /*Create a system socket */ if ((sd = socket(AF_INET,SOCK_STREAM,0))==-1){ fprintf(stderr,"Can't create a socket\n"); exit(1); } /*Bind an address to the socket*/ bzero ((char*)&amp;server,sizeof(struct sockaddr_in)); server.sin_family = AF_INET; server.sin_port = htons(port); server.sin_addr.s_addr = htonl(INADDR_ANY); if(bind(sd,(struct sockaddr *)&amp;server,sizeof(server))==-1){ fprintf(stderr,"can't bind name to socket\n"); exit(1); } /*queue up to 5 connect requests*/ listen(sd,5); while(1){ client_len = sizeof(client); if((new_sd = accept(sd,(struct sockaddr *)&amp;client,&amp;client_len))==-1){ fprintf(stderr,"can't accept client \n"); exit(1); } if(fork()) { printf("\n Server listening to clients on port 2000"); printf("\n Server got request from%s",inet_ntoa(client.sin_addr)); printf("\n SEND DATA&lt;q or Q to quit&gt; :%s",buf); scanf("%s",buf); while((strcmp(buf,"q")!=0)&amp;&amp;(strcmp(buf,"Q")!=0)) { send(new_sd,buf,30,0); scanf("%s",buf); } send(new_sd,"q",5,0); } else{ n = recv(new_sd,buf,30,0); while((strcmp(buf,"q")!=0)&amp;&amp;(strcmp(buf,"Q")!=0)) { printf("\nRECEIVED DATA =%s",buf); n = recv(new_sd,buf,30,0); } printf("\n Bye"); send(new_sd,"EOF",4,0); close(sd); close(new_sd); } } return 0; } Client #include &lt;stdio.h&gt; #include &lt;sys/types.h&gt; #include&lt;sys/socket.h&gt; #include &lt;netdb.h&gt; #include&lt;stdlib.h&gt; #include&lt;strings.h&gt; #include &lt;netinet/in.h&gt; #define SERVER_TCP_PORT 3000 #define BUFLEN 256 int main(int argc,char **argv) { int n,bytes_to_read; int sd,port; struct hostent *hp; struct sockaddr_in server; char *host,*bp,rbuf[BUFLEN],sbuf[BUFLEN]; switch(argc) { case 2: host = argv[1]; port = SERVER_TCP_PORT; break; case 3: host = argv[1]; port = atoi(argv[2]); break; default: fprintf(stderr,"Usage: %s host[port] \n",argv[0]); exit(1); } /*Create a stream socket*/ if ((sd=socket(AF_INET,SOCK_STREAM,0))==-1){ fprintf(stderr,"Can't create a socket\n"); exit(1); } bzero ((char *)&amp;server,sizeof(struct sockaddr_in)); server.sin_family = AF_INET; server.sin_port = htons(port); if((hp = gethostbyname(host))==NULL){ fprintf (stderr,"Can't get server's address\n"); exit(1); } bcopy(hp-&gt;h_addr,(char *)&amp;server.sin_addr,hp-&gt;h_length); /*connecting to the server*/ if (connect (sd,(struct sockaddr *)&amp;server,sizeof(server))==-1){ fprintf(stderr,"Can't connect \n"); exit(1); } printf("Connected:server's address is %s\n",hp-&gt;h_name); if(fork()) { bzero(rbuf,30); printf("\n SEND DATA&lt;q or Q to quit&gt; :%s",rbuf); scanf("%s",rbuf); while((strcmp(rbuf,"q")!=0)&amp;&amp;(strcmp(rbuf,"Q")!=0)) { send(sd,rbuf,30,0); scanf("%s",rbuf); } send(sd,"q",5,0); } else{ n = recv(sd,rbuf,30,0); while((strcmp(rbuf,"q")!=0)&amp;&amp;(strcmp(rbuf,"Q")!=0)) { printf("\nRECEIVED DATA =%s",rbuf); n = recv(sd,rbuf,30,0); } printf("\n Bye"); send(sd,"EOF",4,0); close(sd); } return 0; } </code></pre>
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    1. COrecv() function reads "some" data from the network stream. you need size of the strings in order to get them one by one. Therefore, you should encapsulate the lines (strings) with a header that contains the character count.
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      1. USAlican
    2. COExcuse my ignorance but i didn't quit follow you, would you explain a little bit more
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      1. USabbas
    3. COPlease format your code properly, this is merely readable.
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      1. POc socket programming, Error in receiving a line
      1. USalk
 

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