How does the emulator communicate with the swfs?

Hi everybody.

I've been a coder for the best part of 7 years now. PHP is my strongest language and thus I have good knowledge about Object-Orientated Programming. I know a little bit of C#, I picked the basics fairly fast as PHP was strongly influenced by C#.

Anyway, to the point - I want to further develop Plus Emulator and start coding in stuff that's already within the swfs that hasn't been developed yet. I believe this would be the best way to start. However, my biggest problem is I can't find any tutorials or posts explaining how the emulator sends and receives data to the swfs.

My current understanding:

I know that data is transferred over sockets and sent in packets. I believe that packets are used to send information to the swfs which can be used to trigger functions within classes. But how do I know what information to send to the swf? I have decompiled Habbo.swf and took a look at some of the functions that are linked to the packet headers. I.e. the MOTD notification:

ServerPacketHeader.cs

Code:

---

public const int MOTDNotificationMessageComposer = 705;

---

Habbo.swf

Code:

---

_SafeStr_5698[705] = _SafeStr_3230;

---

Code:

---

this.addMessageEvent(new _SafeStr_2660(this._SafeStr_10206));

---

Code:

---


public function _SafeStr_2660(k:Function)
{
    super(k, CallForHelpPendingCallsMessageParser);
}


public function _SafeStr_5423():CallForHelpPendingCallsMessageParser
{
    return ((_SafeStr_5424 as CallForHelpPendingCallsMessageParser));
}

---

What I don't understand however, is how MOTDNotificationComposer.cs communicates the values necessary to provide the text to the MOTD notification as I don't see where there is a string or integer parameter being required?

Code:

---

public MOTDNotificationComposer(string Message) : base(ServerPacketHeader.MOTDNotificationMessageComposer)
{
    base.WriteInteger(1);
    base.WriteString(Message);
}

---

Maybe I have the wrong understanding of how this all works, but I'd really like someone to be able to help me out with all of this, I want to be able to start developing emulators more.

Thank you, any light shed on this situation would be greatly appreciated.

Quote:

---

What I don't understand however, is how MOTDNotificationComposer.cs communicates the values necessary to provide the text to the MOTD notification as I don't see where there is a string or integer parameter being required?

---

Lets take this packet for example (from my development project):

Code:

---

CreditsBalanceMessageComposer = 2588

---

Code:

---

class CreditsBalanceMessageComposer:
    def __init__(self, currency_balance):
        self.response = Response(outgoing.CreditsBalanceMessageComposer)
        self.response.write_string(str(currency_balance))

---

You can see a string is required, if we look at the swfs, we get:

Code:

---

_SafeStr_7125[2588] = _SafeStr_2378;

---

Code:

---

    public class _SafeStr_2378 extends _SafeStr_2258 implements _SafeStr_2255
    {

        public function _SafeStr_2378(k:Function)
        {
            super(k, _SafeStr_2331);
        }

        public function _SafeStr_5359():_SafeStr_2331
        {
            return ((this._SafeStr_5360 as _SafeStr_2331));
        }


    }

---

The above code tells us that the parsing class for this packet is _SafeStr_2331, which brings us to this class

Code:

---

package _-6Hf
{
    import _-29g._SafeStr_2252;
    import _-29g._SafeStr_2699;

    public class _SafeStr_2331 implements _SafeStr_2252
    {

        private var _SafeStr_9185:int;


        public function parse(k:_SafeStr_2699):Boolean
        {
            this._SafeStr_9185 = int(k.readString());
            return (true);
        }

        public function flush():Boolean
        {
            return (true);
        }

        public function get balance():int
        {
            return (this._SafeStr_9185);
        }


    }
}//package _-6Hf

---

And you can see the parse method is where it reads the string :):

Code:

---

        public function parse(k:_SafeStr_2699):Boolean
        {
            this._SafeStr_9185 = int(k.readString());
            return (true);
        }

---

Quote:

---

Originally Posted by Quackster

Lets take this packet for example (from my development project):

Code:

---

CreditsBalanceMessageComposer = 2588

---

Code:

---

class CreditsBalanceMessageComposer:
    def __init__(self, currency_balance):
        self.response = Response(outgoing.CreditsBalanceMessageComposer)
        self.response.write_string(str(currency_balance))

---

You can see a string is required, if we look at the swfs, we get:

Code:

---

_SafeStr_7125[2588] = _SafeStr_2378;

---

Code:

---

    public class _SafeStr_2378 extends _SafeStr_2258 implements _SafeStr_2255
    {

        public function _SafeStr_2378(k:Function)
        {
            super(k, _SafeStr_2331);
        }

        public function _SafeStr_5359():_SafeStr_2331
        {
            return ((this._SafeStr_5360 as _SafeStr_2331));
        }


    }

---

The above code tells us that the parsing class for this packet is _SafeStr_2331, which brings us to this class

Code:

---

package _-6Hf
{
    import _-29g._SafeStr_2252;
    import _-29g._SafeStr_2699;

    public class _SafeStr_2331 implements _SafeStr_2252
    {

        private var _SafeStr_9185:int;


        public function parse(k:_SafeStr_2699):Boolean
        {
            this._SafeStr_9185 = int(k.readString());
            return (true);
        }

        public function flush():Boolean
        {
            return (true);
        }

        public function get balance():int
        {
            return (this._SafeStr_9185);
        }


    }
}//package _-6Hf

---

And you can see the parse method is where it reads the string :):

Code:

---

        public function parse(k:_SafeStr_2699):Boolean
        {
            this._SafeStr_9185 = int(k.readString());
            return (true);
        }

---

---

Thank you, that really cleared things up for me. One other thing that I'm confused about though, let's say that there's a feature within the hotel that has not yet been coded within the emulator - how would I go about finding the correct packets needed in order to start coding the logic to it? I presume I'd need a packetlogger?

Quote:

---

Originally Posted by Synt4xy

Thank you, that really cleared things up for me. One other thing that I'm confused about though, let's say that there's a feature within the hotel that has not yet been coded within the emulator - how would I go about finding the correct packets needed in order to start coding the logic to it? I presume I'd need a packetlogger?

---

Correct :D:, log the header that the client sent in the current/official Habbo, find the class in the SWF, and look for any similar code that's present in your version of the SWF, then back-track back to the header list :):

Quote:

---

Originally Posted by Quackster

Correct :D:, log the header that the client sent in the current/official Habbo, find the class in the SWF, and look for any similar code that's present in your version of the SWF, then back-track back to the header list :):

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Perfect. Thank you very much :)