Lesson 15 · Callbacks · Quasar Academy

Lesson 15 · Callbacks · Quasar Academy · FiveM School

qu_callbacks

ox_lib

lib

attempt to index a nil value (global 'lib')

Make the resource folder

The server has one folder for this lesson.

Inside your server's resources folder, create this folder:

code

resources/qu_callbacks

Create the files

Every file named in the manifest exists.

Create this exact file layout:

code

resources/qu_callbacks/
fxmanifest.lua
server.lua
client.lua

Write fxmanifest.lua

FiveM knows which files to load and that ox_lib must load first.

Open fxmanifest.lua and paste this:

code

fx_version 'cerulean'
game 'gta5'

shared_script '@ox_lib/init.lua'
client_script 'client.lua'
server_script 'server.lua'

dependencies {
'ox_lib'
}

The dependencies { 'ox_lib' } block tells the server not to start qu_callbacks until ox_lib is running. The singular form dependency 'ox_lib' is tolerated, but the plural block is the canonical one, so use it. The shared_script '@ox_lib/init.lua' line is what actually loads the library and gives you the global lib on both the client and the server.

Write the lesson code

The client asks a question and the server answers it.

Open server.lua and paste this:

code

lib.callback.register('qu_callbacks:getBalance', function(src)
print('[qu_callbacks] server answering ' .. GetPlayerName(src))
return 500
end)

Open client.lua and paste this:

code

RegisterCommand('mybalance', function()
local balance = lib.callback.await('qu_callbacks:getBalance', false)
print('[qu_callbacks] my balance is ' .. balance)
end, false)

Start and test it

The expected proof appears in the correct console.

Make sure ox_lib starts first. Open server.cfg and add both lines in this order:

code

ensure ox_lib
ensure qu_callbacks

Save, then run:

code

restart qu_callbacks

Join the server, then run this test from the chat box (press T) (this is a client command):

code

/mybalance

You will also see [qu_callbacks] server answering YourName in the txAdmin Live Console, proving the request crossed the network and the server is the one that produced the number.

Callbacks: ask a question, get an answer

Build it

Make the resource folder

Create the files

Write fxmanifest.lua

Write the lesson code

Start and test it

Keep reading the full lesson