Unable to receive data from the server

Question

This is my c server side code. I am sending hello to the client which is on java

#include <stdio.h> #include <unistd.h> #include <string.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include<errno.h> #include<arpa/inet.h> #define PORT 6865 #define BUF 256 int main(int argc, char *argv[]) { struct sockaddr_in host, remote; int host_fd, remote_fd; int size = sizeof(struct sockaddr);; int read_t,i; char data[]="hello"; host.sin_family = AF_INET; host.sin_addr.s_addr = htonl(INADDR_ANY); host.sin_port = htons(PORT); memset(&host.sin_zero, 0, sizeof(host.sin_zero)); host_fd = socket(AF_INET, SOCK_STREAM, 0); if(host_fd == -1) { printf("socket error %d\n", host_fd); return 1; } if(bind(host_fd, (struct sockaddr *)&host, size)) { perror("bind error is\n"); printf("errorno is %d\n",errno); return 1; } if(listen(host_fd, 10)) { printf("listen error"); return 1; } printf("Server setup, waiting for connection...\n"); remote_fd = accept(host_fd, (struct sockaddr *)&remote, &size); printf("connection made\n"); //read_t = recv(remote_fd,data,sizeof(data),0); //data[read_t]='\0'; printf("read = %d, data = %s \n", sizeof(data), data); if(sendto(remote_fd,data,sizeof(data),0,NULL,1)==-1) { printf("error in sending back\n"); return 1; } read_t = recv(remote_fd,data,sizeof(data),0); data[read_t]='\0'; printf("read = %d, received_data = %s \n", sizeof(data), data); shutdown(remote_fd, SHUT_RDWR); close(remote_fd); return 0; }

This is the java code

 package com.java.client; import java.io.BufferedInputStream; import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.net.Socket; import java.net.UnknownHostException; import java.nio.ByteBuffer; import java.nio.charset.Charset; public class ClientFirst { public static void main(String[] argv) throws UnknownHostException, IOException { char[] data = new char[10]; Socket s = new Socket("10.9.79.80", 6865); InputStreamReader ins= new InputStreamReader(s.getInputStream()); int da= ins.read(data, 0, 9); System.out.print(Integer.toString(da)); } }

When i am trying to receive the data from c server i am not getting it. Instead of getting hello, i am getting 5.

Anders R. Bystrup · Accepted Answer · 2013-12-17 11:52:44Z

1

You're printing the number of characters read from the stream, not the actual data read. Try this instead:

int da = ins.read(data, 0, 9); System.out.print( data );

Cheers,

answered Dec 17, 2013 at 11:52

Anders R. Bystrup

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1 Comment

Sandeep Over a year ago

@ Anders R. Bystrup Thanx Man

bobbel · Accepted Answer · 2013-12-17 11:57:03Z

Try printing out datavariable, not the return value of InputStreamReader.read in the variable da, like this:

System.out.print(data);

InputStreamReader.read instead returns the number of characters read.

Klas Lindbäck · Accepted Answer · 2013-12-17 11:55:10Z

da is 5 because you read five bytes from the socket. hello consists of 5 bytes, so everything is working just fine. The letters you received have been stored in the variable data.

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