How to call a generic method?

[kajr0s]

I want to call a method GameObject.GetComponent, but

const image = obj.method("GetComponent").inflate(imageType).invoke();

returns 'number', not 'Il2Cpp.Object'.

namespace Verne
{
// Token: 0x0200022E RID: 558
[Token(Token = "0x2000148")]
public class HelpController : MonoBehaviour
{
// Token: 0x06000D8E RID: 3470 RVA: 0x00002050 File Offset: 0x00000250
[Token(Token = "0x60009B2")]
[Address(RVA = "0xD9748C", Offset = "0xD9748C", VA = "0xD9748C")]
private void OnHelpIconCreated(GameObject obj)
{
}

namespace UnityEngine
{
// Token: 0x020000AE RID: 174
[Token(Token = "0x20000AE")]
[UsedByNativeCode]
[Attribute(Name = "NativeHeaderAttribute", RVA = "0x8EDAF4", Offset = "0x8EDAF4")]
[ExcludeFromPreset]
public sealed class GameObject : Object
{
// Token: 0x0600044A RID: 1098 RVA: 0x00002052 File Offset: 0x00000252
[Token(Token = "0x600044A")]
public T GetComponent()
{
return null;
}

import "frida-il2cpp-bridge";

Il2Cpp.perform(() => {
// Il2Cpp.dump();
// console.log(Il2Cpp.unityVersion);

const assemblyCSharp = Il2Cpp.domain.assembly("Assembly-CSharp").image;

const helpController = assemblyCSharp.class("Verne.HelpController");
const onHelpIconCreated = helpController.method("OnHelpIconCreated");
const unityEngineUI = Il2Cpp.domain.assembly("UnityEngine.UI").image;
const imageType = unityEngineUI.class("UnityEngine.UI.Image");

// @ts-ignore
onHelpIconCreated.implementation = function(this: Il2Cpp.Object, obj: Il2Cpp.Object) {
    // ??? obj.GetComponent<Image>() return 'number'
    const image = obj.method("GetComponent").inflate(imageType).invoke();
    if (image)
    {
        console.log("Component 'Image' found");
        const sprite = image.method("get_sprite").invoke();

C:/code/frida-agent-example/agent/index.ts (62,34): Property 'method' does not exist on type 'number | true | NativePointer | Int64 | UInt64 | Object | Pointer | ValueType | String | Array<Type
Property 'method' does not exist on type 'number'.
Error: compilation failed
at Module.build (file:///C:/code/frida-agent-example/node_modules/frida-compile/dist/compiler.js:34:15)
at main (file:///C:/code/frida-agent-example/node_modules/frida-compile/dist/cli.js:37:33)
at file:///C:/code/frida-agent-example/node_modules/frida-compile/dist/cli.js:57:5
at ModuleJob.run (node:internal/modules/esm/module_job:198:25)
at async Promise.all (index 0)
at async ESMLoader.import (node:internal/modules/esm/loader:385:24)
at async loadESM (node:internal/process/esm_loader:88:5)
at async handleMainPromise (node:internal/modules/run_main:61:12)

[kajr0s]

Alternatively, call another overload method 'public extern Component GetComponent(Type type)'

// Token: 0x020000AE RID: 174
[Token(Token = "0x20000AE")]
[UsedByNativeCode]
[Attribute(Name = "NativeHeaderAttribute", RVA = "0x8EDAF4", Offset = "0x8EDAF4")]
[ExcludeFromPreset]
public sealed class GameObject : Object
{
	// Token: 0x0600044B RID: 1099
	[Token(Token = "0x600044B")]
	[Address(RVA = "0x150BFA8", Offset = "0x150BFA8", VA = "0x150BFA8")]
	[Attribute(Name = "FreeFunctionAttribute", RVA = "0x8F4AC8", Offset = "0x8F4AC8")]
	[Attribute(Name = "TypeInferenceRuleAttribute", RVA = "0x8F4AC8", Offset = "0x8F4AC8")]
	[MethodImpl(4096)]
	public extern Component GetComponent(Type type);

but I don’t understand how to pass the type in the parameter.

[thinhbuzz]

Use imageType.type.object

[kajr0s]

Thanks, this really works!!!