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surf

•Created by surf on 6/1/2024 in #help

MarshalDirectiveException: Cannot marshal 'return value': Invalid managed/unmanaged type combination

Basically trying to wrap a dll (wiiuse library) into my godot game with c# and whenever i call my wrapped function i get this error:

E 0:00:00:0903   System.IntPtr[] WiiUse.WiiuseInit(int): System.Runtime.InteropServices.MarshalDirectiveException: Cannot marshal 'return value': Invalid managed/unmanaged type combination.
  <C++ Error>    System.Runtime.InteropServices.MarshalDirectiveException
  <C++ Source>   :0 @ System.IntPtr[] WiiUse.WiiuseInit(int)
  <Stack Trace>  :0 @ System.IntPtr[] WiiUse.WiiuseInit(int)
                 Test.cs:12 @ void Test._Ready()
                 Node.cs:2137 @ bool Godot.Node.InvokeGodotClassMethod(Godot.NativeInterop.godot_string_name&, Godot.NativeInterop.NativeVariantPtrArgs, Godot.NativeInterop.godot_variant&)
                 Test_ScriptMethods.generated.cs:48 @ bool Test.InvokeGodotClassMethod(Godot.NativeInterop.godot_string_name&, Godot.NativeInterop.NativeVariantPtrArgs, Godot.NativeInterop.godot_variant&)
                 CSharpInstanceBridge.cs:24 @ Godot.NativeInterop.godot_bool Godot.Bridge.CSharpInstanceBridge.Call(nint, Godot.NativeInterop.godot_string_name*, Godot.NativeInterop.godot_variant**, int, Godot.NativeInterop.godot_variant_call_error*, Godot.NativeInterop.godot_variant*)

E 0:00:00:0903   System.IntPtr[] WiiUse.WiiuseInit(int): System.Runtime.InteropServices.MarshalDirectiveException: Cannot marshal 'return value': Invalid managed/unmanaged type combination.
  <C++ Error>    System.Runtime.InteropServices.MarshalDirectiveException
  <C++ Source>   :0 @ System.IntPtr[] WiiUse.WiiuseInit(int)
  <Stack Trace>  :0 @ System.IntPtr[] WiiUse.WiiuseInit(int)
                 Test.cs:12 @ void Test._Ready()
                 Node.cs:2137 @ bool Godot.Node.InvokeGodotClassMethod(Godot.NativeInterop.godot_string_name&, Godot.NativeInterop.NativeVariantPtrArgs, Godot.NativeInterop.godot_variant&)
                 Test_ScriptMethods.generated.cs:48 @ bool Test.InvokeGodotClassMethod(Godot.NativeInterop.godot_string_name&, Godot.NativeInterop.NativeVariantPtrArgs, Godot.NativeInterop.godot_variant&)
                 CSharpInstanceBridge.cs:24 @ Godot.NativeInterop.godot_bool Godot.Bridge.CSharpInstanceBridge.Call(nint, Godot.NativeInterop.godot_string_name*, Godot.NativeInterop.godot_variant**, int, Godot.NativeInterop.godot_variant_call_error*, Godot.NativeInterop.godot_variant*)

My Code:

    [DllImport("wiiuse.dll", EntryPoint = "wiiuse_init", CallingConvention = CallingConvention.Cdecl)]
    public static extern IntPtr[] WiiuseInit(int numWiimotes);

    [DllImport("wiiuse.dll", EntryPoint = "wiiuse_init", CallingConvention = CallingConvention.Cdecl)]
    public static extern IntPtr[] WiiuseInit(int numWiimotes);

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