CODEWITHSUNDEEP
apache-flexsocketsairflex3
Sarfraz Ahmed
Sarfraz Ahmed

Reputation: 1399

Http communication with C application

I have a C program and that runs a web server. I have a Air Application and I want to communicate with that web server using Air Application. I create a socket object and do the following.

public function httpTest():void
    {      
      sock.addEventListener(Event.CONNECT, onConnect);
      sock.addEventListener(ProgressEvent.SOCKET_DATA, onDataRecv);
      sock.addEventListener(IOErrorEvent.IO_ERROR, onError);
      try
      {
        trace("Connecting...");
        sock.connect("127.0.0.1", 9800);            
        sock.writeMultiByte("GET /Connection?data=version", "us-ascii");
        sock.flush();
      }
      catch(err:Error)
      {
        trace(err.message);
      }
    }

    public function onConnect(event:Event):void
    {
      trace("onConnect +");
    }

    public function onDataRecv(event:ProgressEvent):void
    {
      trace("onDataRecv +");
    }

    public function onError(event:Event):void
    {
      trace("onError +");
    }

socket connects successfully and its connection event is fired. but when I try to request the connection url nothing is received on server side. am I missing something. Thanks

Upvotes: 0

Views: 80

Answers (2)

Sarfraz Ahmed
Sarfraz Ahmed

Reputation: 1399

I made a mistake. I did not add HTTP version and string terminator in the Get String. Thats why I did not receive any print on server side. Because the request was invalid. I posted the working code. Thanks for help.

public function httpTest():void
    {      
      sock.addEventListener(Event.CONNECT, onConnect);
      sock.addEventListener(ProgressEvent.SOCKET_DATA, onDataRecv);
      sock.addEventListener(IOErrorEvent.IO_ERROR, onError);
      try
      {
        trace("Connecting...");
        sock.connect("127.0.0.1", 9800);            
        sock.writeMultiByte("GET /Connection?data=version HTTP/1.0\r\n\r\n", "us-ascii");
        sock.flush();
      }
      catch(err:Error)
      {
        trace(err.message);
      }
    }

    public function onConnect(event:Event):void
    {
      trace("onConnect +");
    }

    public function onDataRecv(event:ProgressEvent):void
    {
      trace("onDataRecv +");
    }

    public function onError(event:Event):void
    {
      trace("onError +");
    }

Upvotes: 0

Steve Allison
Steve Allison

Reputation: 1111

Like just about everything to do with networking in Flex, socket.connect is asynchronous and non-blocking, meaning that just because sock.connect has returned without error it doesn't mean the socket is actually ready for use yet. I suspect that if you put trace(sock.connected) in your original code after your call to writeMultiByte it will print false.

You will need to delay your sock.writeMultiByte call until the connection is ready, which isn't until your onConnect handler fires. Try:

try
{
    trace("Connecting...");
    sock.connect("127.0.0.1", 9800);            
}
catch(err:Error)
{
    trace(err.message);
}
...
public function onConnect(event:Event):void
{
  trace("onConnect +");
  sock.writeMultiByte("GET /Connection?data=version", "us-ascii");
  sock.flush();
}

Upvotes: 2

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