Hello,
I wonder if you can help me. I am new to nodejs and I am trying to write
a little application that will talk to a server written in C (the server
is third-party). The server requires XML messages with a binary string
for the length of the message being sent. The string is meant to
represent a unsigned int 32bit word. I'm not so familiar with bit
manipulation.
I tried the following code (follwing an example on stackexchange):
var net = require('net');
var result = '';
var msgheader = "some string";
var msg = "some other string";
var msglen = msgheader.length;
result += String.fromCharCode(msglen >>> 24 & 0xFF);
result += String.fromCharCode(msglen >>> 16 & 0xFF);
result += String.fromCharCode(msglen >>> 8 & 0xFF);
result += String.fromCharCode(msglen & 0xFF);
var smsg = result + msgheader + msg;
var client = net.createConnection({host: 'localhost', port: 1250});
client.write(smsg);
client.end();
The C server picks up the correct length if the msglen is 127 or less.
But, if it's 128 or more the server doesn't seem to decode the length
correctly (it decodes a much larger length) and reads part of the
message instead of reading just the header.
I'm not sure what the problem is or how to go about fixing it. It almost
seems as if the packing of the string is missing something. But, I'm not
sure what.
The following ruby code works fine.
require 'socket';
s = TCPSocket.open('localhost', 1250);
msg = "header message..."
hmsg = hmsg + "some message..."
smsg = [hmsg.length].pack("N") + msg
s.write(smsg)
s.close
Does anyone have any ideas or suggestions?
Many thanks,
adil
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