Passing callback function from server to client and back

frekux · 2019-08-11T23:57:34.520Z

I’m trying to pass a callback function from server to client and back but when function should be called on server side it prints error in console:

SCRIPT ERROR: citizen:/scripting/lua/MessagePack.lua:830: missing bytes

Code:
server.lua

RegisterNetEvent('runServerCallback')
AddEventHandler('runServerCallback', function(cb, ...)
    cb(...) -- error occurs here
end)

RegisterCommand('cb', function(source)
    TriggerClientEvent('fq:getPlayerPed', -1, source, function(ped)
        local pos = GetEntityCoords(ped)
        TriggerClientEvent('chat:addMessage', -1, {
            args = {pos.x ..';' .. pos.y .. ';' .. pos.z}
        })
    end)
end)

client.lua

RegisterNetEvent('fq:getPlayerPed')

AddEventHandler('fq:getPlayerPed', function(source, cb)
    local ped = GetPlayerPed()
    TriggerServerEvent('runServerCallback', cb, ped)
end)

All i’m trying to achieve here is to get player’s ped from client script and pass it to the server side.

xander1998 · 2019-08-12T00:22:10.891Z

You cant do that in the default scripting environment. ESX’s server callbacks are manually scripted to act like a callback though.

frekux · 2019-08-12T00:36:08.050Z

If i cant do that then how can i achieve what im trying to do here otherwise? Can you explain me second part of your ansewer with some example in code?

xander1998 · 2019-08-12T02:00:48.688Z

I would say to maybe take a look at the ESX source code. ESX has some code that allows them to do server callbacks that returns data.