Saving modded characters parameters

[M_Balthazar_M]

Hi! I am trying to make a character that can craft consumable items used to upgrade himself.
I already did the upgrades part but now i have a bunch of tags and stats that i need saved and loaded.
 

I figured out that has something to do with the functions OnSave and OnLoad but I cannot seem to wrap my head around how to use them.

Basically I just need to store the fact that the character has a tag like "test_tag" and his stats like inst.components.health.maxhealth and also being able to load the values like:

 local function onsave(inst, data)
     if inst:HasTag("test_tag") then

            data.something=true
    end

      data.maxhealth_or_something = inst.components.health.maxhealth

end    
 

 

local function onload(inst, data)

     if data.something then

          inst:AddTag("testtag")

     end

     inst.components.health.maxhealth = data.something

end

 

Can someone please explain to me how all this works?

[Bumber64]

You need to attach the functions to your character prefab. Put these lines in the function that defines your character:

inst.OnSave = onsave
inst.OnLoad = onload

Edited June 5, 2022 by Bumber64

[M_Balthazar_M]

Yes, I've put those lines... is the inside of the onsave / onload function that still does not work

[Bumber64]

Doesn't work as in does nothing, or crashes?

In your example, you should be loading maxhealth_or_something instead of something into maxhealth. Not sure if your actual code has this problem.

[M_Balthazar_M]

This is my code that I was using for testing:

Spoiler

local function onsave(inst, data)
    data.currenthealth = inst.components.health.currenthealth
    data.maxhealth = inst.components.health.maxhealth
    
    data.currenthunger = inst.components.hunger.current
    data.maxhunger = inst.components.hunger.max
    
    data.currentsanity = inst.components.sanity.current
    data.maxsanity = inst.components.sanity.max
    
    if inst:HasTag("speed") then
        data.speed = true
    else 
        data.speed = false
    end
    
    if inst:HasTag("spiderwhisperer") then
        data.spiderwhisperer = true
    else 
        data.spiderwhisperer = false
    end
end

local function onload(inst, data)
    if data =~ nil then
        inst.components.health:SetMaxHealth(data.maxhealth)
        inst.components.health:DoDelta(data.currenthealth-data.maxhealth)

        inst.components.hunger:SetMax(data.currenthunger )
        inst.components.hunger:DoDelta(data.currenthunger -data.maxhunger)

        inst.components.sanity:SetMax(data.maxsanity)
        inst.components.sanity:DoDelta(data.currentsanity -data.maxsanity)

        if data.speed = true then
            inst.components.locomotor:SetExternalSpeedMultiplier(inst, "balthazar_speed_mod", 2)
        else 
            inst.components.locomotor:SetExternalSpeedMultiplier(inst, "balthazar_speed_mod", 1)
        end
        
        if inst:HasTag("spiderwhisperer") then
            inst:AddTag("spiderwhisperer")
        else 
            inst:RemoveTag("spiderwhisperer") --just to be sure you don't have a tag you shouldn't have
        end
    end

end

 

 

then in the master_postinit

...

inst.OnSave = onsave
inst.OnLoad = onload

It crashes dontstarve_dedicated_server_nullrenderer_x64.exe and therefore I cannot access the world, but the game doesn't go down.
Maybe it is a syntax error but I am not familiar enough with lua to understand where

[Bumber64]

Should probably be:

if data.spiderwhisperer then
    inst:AddTag("spiderwhisperer")
elseif inst:HasTag("spiderwhisperer") then
    inst:RemoveTag("spiderwhisperer") --just to be sure you don't have a tag you shouldn't have
end

There should be a log file somewhere containing any errors that occur. Not familiar with dedicated servers, but regular logs are usually stored in Documents/Klei/DoNotStarveTogether.

Edited June 9, 2022 by Bumber64

[M_Balthazar_M]

Ok, I think I figured why that was crushing.
First, Bumber64 was right... kind of. Yes, the spiderwhisperer thing was right but that wasn't the main problem.

the 

if data =~ nil then

had to become

if data ~= nil then

 

Then there was a problem with hunger that used the current hunger to set the max...
Also the speed multiplier was set but it didn't add the tag "speed" again, therefore if you save and exit twice the character looses the speed bonus.

Here there is the actual working code, I hope somebody will find this useful! :)

Spoiler

local function onsave(inst, data)
    data.currenthealth = inst.components.health.currenthealth
    data.maxhealth = inst.components.health.maxhealth
    
    data.currenthunger = inst.components.hunger.current
    data.maxhunger = inst.components.hunger.max
    
    data.currentsanity = inst.components.sanity.current
    data.maxsanity = inst.components.sanity.max
    
    if inst:HasTag("speed") then
        data.speed = true
    else 
        data.speed = false
    end
    
    if inst:HasTag("spiderwhisperer") then
        data.spiderwhisperer = true
    else 
        data.spiderwhisperer = false
    end
end

local function onload(inst, data)
    if data ~= nil then
        inst.components.health:SetMaxHealth(data.maxhealth)
        inst.components.health:DoDelta(data.currenthealth-data.maxhealth)--current-max=-(max-current) e dodelta lo toglie.

        inst.components.hunger:SetMax(data.maxhunger)
        inst.components.hunger:DoDelta(data.currenthunger-data.maxhunger)

        inst.components.sanity:SetMax(data.maxsanity)
        inst.components.sanity:DoDelta(data.currentsanity-data.maxsanity)

        if data.speed then
            inst.components.locomotor:SetExternalSpeedMultiplier(inst, "balthazar_speed_mod", 2)
            inst:AddTag("speed")
        else 
            inst.components.locomotor:SetExternalSpeedMultiplier(inst, "balthazar_speed_mod", 1)
            inst:RemoveTag("speed") --just to be sure you don't have a tag you shouldn't have
        end
        
        if data.spiderwhisperer then
            inst:AddTag("spiderwhisperer")
        else 
            inst:RemoveTag("spiderwhisperer") --just to be sure you don't have a tag you shouldn't have
        end
    end
end