How to execute a function clientside and get the result serverside ?

[Ricky Servietsky]

I might have asked my question the wrong way but anyway i will explain further below,
I'm making a swep to get the ScrW() and ScrH() of the aimed player and save it into a file (yes that's a bit weird)
So far my swep is really simple and i'm able to get the aimed player by using a traceline but i have no idea how to do it, however i tried this :
function SWEP:PrimaryAttack()
  local tr = util.TraceLine( util.GetPlayerTrace( self.Owner ) )
  print(tr.Entity)
  if SERVER and IsValid(tr.Entity)  and tr.Entity:IsPlayer() then
    tr.Entity:SendLua("LocalPlayer():SetVar(\"test\", ScrW())")
    print(tr.Entity:GetTable()['test'])
  end
end
But it returns nil serverside.
I might no have understand how this kind of things works... sorry in advance
Thanks in advance for any answer.

[G😹nz😻]

Use a netmessage, like this
<Swep primary fire>
net.Start("Fetch screen width")
net.Send(self.Owner)
<Swep primary fire>

function SWEP:ShootWidth(wide)
MsgN("our width is "..wide)
end

if CLIENT then
net.Receive("Fetch screen width", function()
net.Star("Fetch screen width")
net.WriteInt(ScrW(), 64)
net.SendToServer()
end)
else
net.Receive("Fetch screen width", function(l, ply)
local width = net.ReadInt(64)
ply:GetActiveWeapon():ShootWidth(width)
end)
end

[Ricky Servietsky]

If i want to get the player screenwidth i send the player i'm aiming at entity so ?

Thanks a lot for this answer it will help me a lot

[ubre]

util.AddNetworkString("SendMeScreen")
util.AddNetworkString("SendMyScreenToThisGuy")
util.AddNetworkString("HeresYourScreenDude")

function SWEP:PrimaryAttack()

     if(SERVER) then

          local ent = self.Owner:GetEyeTrace().Entity

          if(ent:IsPlayer()) then

               net.Start("SendMeScreen")
                    net.WriteEntity(self.Owner)
               net.Send(ent)

          end

     end

end

net.Receive("SendMyScreenToThisGuy", function()

     local info = net.ReadTable()
     local receiver = net.ReadEntity()

     net.Start("HeresYourScreenDude")
          net.WriteTable(info)
     net.Send(receiver)

end)

if(SERVER) then return end

net.Receive("SendMeScreen", function()

     local messanger = net.ReadEntity()

if(messanger:IsPlayer()) then

          net.Start("SendMyScreenToThisGuy")
               net.WriteTable( {scrW(), scrH()} )
               net.WriteEntity(messanger)
          net.SendToServer()

     end

end)

net.Receive("HeresYourScreenDude", function()

     local tab = net.ReadTable()
     local width = tab[1]
     local height = tab[2]

     print("Oh shit, this guy has a width of "..tostring(width).." and a height of "..tostring(height))

end)