Binary socket and policy file in Flex
- by Daniil
Hi, I'm trying to evaluate whether Flex can access binary sockets. Seems that there's a class calles Socket (flex.net package). The requirement is that Flex will connect to a server serving binary data. It will then subscribe to data and receive the feed which it will interpret and display as a chart. I've never worked with Flex, my experience lies with Java, so everything is new to me. So I'm trying to quickly set something simple up. The Java server expects the following:
DataInputStream in = .....
byte cmd = in.readByte();
int size = in.readByte();
byte[] buf = new byte[size];
in.readFully(buf);
... do some stuff and send binary data in something like
out.writeByte(1);
out.writeInt(10000);
... etc...
Flex, needs to connect to a localhost:6666 do the handshake and read data. I got something like this:
try {
var socket:Socket = new Socket();
socket.connect('192.168.110.1', 9999);
Alert.show('Connected.');
socket.writeByte(108); // 'l'
socket.writeByte(115); // 's'
socket.writeByte(4);
socket.writeMultiByte('HHHH', 'ISO-8859-1');
socket.flush();
} catch (err:Error) {
Alert.show(err.message + ": " + err.toString());
}
The first thing is that Flex does a <policy-file-request/>. I've modified the server to respond with:
<?xml version="1.0"?>
<!DOCTYPE cross-domain-policy SYSTEM "/xml/dtds/cross-domain-policy.dtd">
<cross-domain-policy>
<site-control permitted-cross-domain-policies="master-only"/>
<allow-access-from domain="192.168.110.1" to-ports="*" />
</cross-domain-policy>
After that - EOFException happens on the server and that's it.
So the question is, am I approaching whole streaming data issue wrong when it comes to Flex? Am I sending the policy file wrong? Unfortunately, I can't seem to find a good solid example of how to do it. It seems to me that Flex can do binary Client-Server application, but I personally lack some basic knowledge when doing it.
I'm using Flex 3.5 in IntelliJ IDEA IDE.
Any help is appreciated.
Thank you!
