Accessing 0x10 Error while invoke non static method

[dvgmdvgm]

Hello. First of all big thanks for A12 fix.

I want to invoke some method but it's non static.
try to invoke like that :

const classs = Il2Cpp.Domain.assembly("imageName").image.class("className");
classs.method<void>("MethodName").invoke((Il2Cpp.String.from("data"));

it gives me this output :
Error: access violation accessing 0x10 at invokeRaw (node_modules/frida-il2cpp-bridge/dist/il2cpp/structs/method.js:168)

My class have Instance object too.
Maybe i should to invoke my method with Instance object?
How i can achieve it?
Thank you.

[vfsfitvnm]

That's a static method, otherwise you would get another error.
Also, it doesn't look like a frida-il2cpp-bridge issue, however I cannot give you more info since you didn't provide the signature of the method you are trying to invoke

[dvgmdvgm]

@vfsfitvnm i also get this error that you show to me serveral tries before.
must be invoked throught a Il2Cpp.Object, not a Il2Cpp.Class
How it can be resolved?
Sorry for distrubing

[vfsfitvnm]

You must call that method using a Il2Cpp.Object. E.g:

class System.String
{
    System.Boolean Contains(System.String value); // 0x0082c664;
    static System.Boolean IsNullOrEmpty(System.String value); // 0x0082c684;
}

const SystemString = Il2Cpp.Image.corlib.class("System.String");
const string = Il2Cpp.String.from("hello");

// Contains is not static, so:
console.log(string.object.method<boolean>("Contains").invoke(Il2Cpp.String.from("el"))); // true

// IsNullOrEmpty is static, so:
console.log(SystemString.method<boolean>("IsNullOrEmpty").invoke(string)); // true

The difference is in how you obtain the method: Contains is obtained via a Il2Cpp.Object (Il2Cpp.String::object returns a Il2Cpp.Object), IsNullOrEmpty is obtained via a Il2Cpp.Class.

I don't know how you can retrieve an instance of that class, it really depends on what you are trying to do. You can take a look at the past issues (like #39)

[qiaozhi-4]

Hi, I was wondering how to create this step if it's not a String type
const string = Il2Cpp.String.from("hello");

[dvgmdvgm]

It's all about corlib...
But how about Assembly-CSharp?
Try by this snippet :

const ClassName1= Il2Cpp.Domain.assembly("Assembly-CSharp").image.class("ClassName");

const Infl = ClassName1.inflate(SystemObject);

const Instance = Infl.new();

log(Instance);

Instance.method("MethodName").invoke(get_Profile("BEST"));


OUTPUT : 
`il2cpp: cannot inflate class ClassName: it has no generic parameters`

[vfsfitvnm]

Well it seems there's a bit of confusion here... Why are you trying to inflate a generic class?

Also, did you read the issue I linked?

[dvgmdvgm]

working by following snippet

const Instance = mod("Assembly-CSharp", "ClassName").method<Il2Cpp.Object>("get_Instance").invoke();
Instance.method("MethodName").invoke(get_Profile("BEST"));

It's my fault cause i'm try to invoke method to early. Like immediately after attached to process.
Try to invoke it from another implementation and it's works.. Sorry.

[kolanski]

what is mod function?

[IrvanWijayaSardam]

looks like my question is belongs to here, i hope somebody can help, i still learning, how do i call b__25_7 ? i've got this message

il2cpp: cannot invoke non-static method <Awake>b__25_7 as it must be invoked throught a Il2Cpp.Object, not a Il2Cpp.Class at invoke (il2cpp/structs/method.ts:214) at <anonymous> (src/index.ts:30) at call (native) at <anonymous> (il2cpp/structs/method.ts:328)

this is my frida script
`import "frida-il2cpp-bridge";

console.log("Frida loaded successfully !!");

Il2Cpp.perform(function () {

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

const TableManager = AssemblyCSharp.class("TableManager");
const LobbyMenu = AssemblyCSharp.class("LobbyMenu");

const OnBackBtn = TableManager.method("OnBackBtn");
const AwakeB257 = LobbyMenu.method("<Awake>b__25_7");

OnBackBtn.implementation = function (unused) {
    console.log("Back Button Hooked !!");
    AwakeB257.invoke();
};

});
`

and this is the awake function from dnSpy
private void <Awake>b__25_7() {}