TFS 1.X+ Extended OP Codes

[Togu]

How do they work?
How do I use them?

I need to send a new information (like player attack speed) to the client.

Can someone give me a simple example of a custom extended op code working?
Or teach me the theory.

 

[Apollos]

Extended opcodes will send a number or a string through the buffer parameter, so for example:

player:sendExtendedOpcode(51, attackSpeed)

51 is the assigned opcode, which you want to make sure you're using an unused opcode (OTC uses 51-99 for custom opcodes) which can be viewed in OTC's gamelib/protocol.lua

Next you need to register the opcode inside of OTC and use the callback parameter to work with the buffer, for instance, to assign to a global or local variable to be used however, like so:

ProtocolGame.registerExtendedOpcode(51, function(protocol, opcode, buffer)
    attackSpeed = buffer
end)

Then you may use the new variable however you need within OTC, but keep in mind you need to unregister the opcode before you can send a new one over and re-register it, like this:

ProtocolGame.unregisterExtendedOpcode(51)

That's the gist of it, if you would like to send opcodes from client to server you would do this:

local protocolGame = g_game.getProtocolGame()
if protocolGame then
    protocolGame:sendExtendedOpcode(51, attackSpeed)
end

And then retrieve in server sided through creaturescripts/extended_opcode.lua and read the buffer the same way.