LUA Function - Object does not match Target Type

[AvalonGames]

Hey Tony,

I was trying to register my custom Methods and followed your tutorial : Connecting C# Methods to LUA.

So I wrote similar code as shown below

LUA.png (88.61 KiB) Viewed 244 times

I registered 3 methods to test. The first two are calling LevelUp() and GainExp() from a Character ScriptableObject, and GainXp is calling a local method.

GainXp works without any issues.

When I try to call my two functions from my scriptable Object I run into Object does not match Target Type error. I have the methods registered to the LUA Function

lua2.png (2.86 KiB) Viewed 244 times

lua3.png (31.05 KiB) Viewed 244 times

I know there's another thread that was similar to my question, but I wasn't able to fully draw a solution to my issue.

Thanks again as always for helping me debug.
Cheers

[Tony Li]

Hi,

Try creating methods inside your PlayerController script:

Code: Select all

Lua.RegisterFunction("GainExp", this, SymbolExtensions.GetMethodInfo(() => PlayerGainExp((double)0)));
...
private void PlayerGainExp(double exp)
{
    this.player.GainExp(exp);
}

[AvalonGames]

Hey Tony,

Thanks as always, this way works and fixes the issue I'm having, but I was wondering why calling the method directly from the Scriptable Object seems to cause an error?

Correct me if I'm wrong, but from my understanding with OOP if you need a behavior to change properties of an object you’d define it as a function in that class (In this case I have the functions in the SO class). So creating a local method to call player.GainExp() seems kind of redundant to me.

Thanks!

[Tony Li]

The issue is in the Lua registration. You're mapping the Lua function to an instance of your PlayerController script (this), but you're mapping a method that's in a different class and instance (this.player).

Technically you could do something like this, which will map the Lua function to the CharacterDataSO instance:

Code: Select all

Lua.RegisterFunction("GainExp", this.player, SymbolExtensions.GetMethodInfo(() => this.player.GainExp((double)0)));

However, I just think it's easier if you always map functions to methods in the same class.

[AvalonGames]

Ohh, I understanding what's happening now Thanks for explaining.

Also I agree, I think it is easier to just do as you suggested!

[Tony Li]

Happy to help!