[Mattaffix]

I was wondering...which is the best way to detect when a player has detached or attached to a trailer?
Of course while a player is driving a truck.

[TheDrx]

if(IsTrailerAttachedToVehicle(vehicleid))
{
printf("Vehicle %i has a trailer!", vehicleid);
}

vehicleid = Truck ID

More informations: https://sampwiki.blast.hk/wiki/IsTrailerAttachedToVehicle

[Mencent]

Hello.

So that you can get the ID of the trailer you can use GetVehicleTrailer().
https://sampwiki.blast.hk/wiki/GetVehicleTrailer

With TheDrx's code you can check wheather the vehicle has a trailer or not.

[Mattaffix]

Alright so I assume I have to use a timer in order to detect if (IsPlayerAttachedToVehicle(vehicleid)) right? But how exactly?

[Mencent]

It depends on what you want to do.
Can you explain us what do you want to do, please? Then we can tell you what it's the best solution.

[Mattaffix]

Sure.
I made a trucking delivery system. It works well,you deliver stuff from one point to another.
What I need to know is how should I detect when the trailer that the player is using to transport goods gets detached from the truck and also when the player manages to re-attach the trailer. Just like single-player when you get start the trucking missions and get notified when you lose your trailer or leave the vehicle.

[Mencent]

Ah, you want to check if the trailer is always detect when the player must be delivering something with this trailer?
Then you should use a timer which you start when the player start the delivering and stop when the mission is finish.
Notice: Use SetTimerEx because you should use the playerid.

[Mattaffix]

I don't know I was thinking of using a timer pretty much like OnPlayerUpdate and check if the player has the trailer attached to his truck. If the trailer is detached there should be like a function that prints the seconds the player has left to get the trailer back,hmmm? If someone can show me like an example,that would be really great and much appreciated!

[Mencent]

I advise you to use OnPlayerUpdate.

Try this:

PHP код:

//under the includes:
new playerToTrailer[MAX_PLAYERS],missionTimer[MAX_PLAYERS];
//When you start the mission (when you attached the trailer):
missionTimer[playerid] = SetTimerEx("OnPlayerDoMission",1000,1,"i",playerid);
playerToTrailer[playerid] = 10;//10 seconds to attach the trailer again
//the callback:
forward OnPlayerDoMission(playerid);
public OnPlayerDoMission(playerid)
{
    new veh = GetPlayerVehicleID(playerid);
    if(!IsTrailerAttachedToVehicle(veh))
    {
        playerToTrailer[playerid] --;
        if(playerToTrailer[playerid] == 0)
        {
            KillTimer(missionTimer[playerid]);
            SendClientMessage(playerid,-1,"Your mission is deleted! You lose the trailer");
            return 1;
        }
        new string[145];
        format(string,sizeof string,"You have only %d seconds to attach the trailer again!",playerToTrailer[playerid]);
        SendClientMessage(playerid,-1,string);
        return 1;
    }
    else
    {
        playerToTrailer[playerid] = 10;
    }
    return 1;
}
//when you finish the Mission correct:
KillTimer(missionTimer[playerid]); 


[Mattaffix]

Your code seems okay,I've tested it and after few tweaks it seems that it's working exactly how I wanted.

Thanks for helping out!