Custom send_target type

[Mathew]

Hello,

I'm going to describe what I'd like to accomplish.

I have a party with 2 users, player1 enables a command that will display a hateffect on himself, and on the party members as well.

Player 2, has disabled that command, so he won't see any hateffect, neither on him or the other party members.

Once player2 enables the command, he will see the hateffect on him and his party members.

I've tried with the function clif_hat_effect_single and different target type, but none of them seems to fit my previous requirements.

That's why i was thinking about create a custom target type, however I don't quite understand that logic with these:

WFIFOHEAD( fd, len );
 memcpy( WFIFOP( fd, 0 ), buf, len );
 WFIFOSET( tsd->fd, len );

So, after several hours trying, I'd like to ask for some help on this..

 

Thank you for your time!