java dataoutput stream sending more bytes

Question

I have one server listening on port and ip and a client which will connect to this server.

DataInputStream meterin=new DataInputStream(socket.getInputStream);
DataOutputStream modemds=new DataOutputStream(modems.getOutputStream);

now server is sending some data here:(CA F0 00 00 00 00 00 00 00 3A).But when I read this as

int c;
byte bt[]=new byte[11]
c=meterin.read(bt,0,11)`
System.out.println("bytes"+c)  // it is returning 10 bytes

modemds.write(bt,0,c)

but at client i am getting. (CA F0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00). which is more than 10 bytes even it is reading 10 bytes upwards.

I think that is the code used to send the data - but it's not clear why you're not looping round until you've read as much data as you expected, or what the code on the receiving side is. Please clarify your question, as it's hard to understand at the moment. — Jon Skeet
– Jon Skeet, Commented Aug 11, 2012 at 9:42
Actually here i do not know about the no of bytes to be read .Here server send commands which are not fixed and are of varying bytes and do not have and termination characters. — user1582791
– user1582791, Commented Aug 11, 2012 at 13:39

user207421 · Accepted Answer · 2012-08-11 10:09:23Z

1

You cannot assume the read will fill the buffer. See readFully() for an alternative, or else loop until you get all the data you need.

answered Aug 11, 2012 at 10:09

user207421

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Comments

Vamsi Mohan Jayanti · Accepted Answer · 2012-08-11 10:17:20Z

0

With some assumptions and fFrom the code it looks like you are reading the data from server and then relaying it to another listener or what you call as client. So on the client side code please check if the receiving buffer is initialized to more than the data being sent .. that would then lead to adding additional bytes in output. If that is the case, use System.arrayCopy to copy out the actual bytes from the receiving buffer (assuming the client code is java).

answered Aug 11, 2012 at 10:17

Vamsi Mohan Jayanti

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2 Comments

user207421 Over a year ago

Data copying is unnecessary. write(buffer, 0, count) is all that is required.

user1582791 Over a year ago

Here client is basically a modem(socket) which is connected to some other server at different ip and port. so how should i check about receiving buffer initialization

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