Can I get a class(object) from function return value?

[millie-molly]

Can I get a class(object) from function return value?

[dcharkes]

.ref is an extension method, not an instance method: https://api.dart.dev/stable/3.0.5/dart-ffi/StructPointer/ref.html

Even methods that are instance methods in dart:ffi are often prohibited to be used from dynamic. The reason is that we need to "see" the dart:ffi uses at compile time because it uses a special compilation.

Why do you want to use dynamic? Why not use final testClass = createClass() (or var testClass = ...) and have static typing without having to write the type?

[millie-molly]

I found same issue 123

My understanding is that class is not part of ABI, so change class to struct from header file.

Is it right?

BTW, static variable ( using final ) returns same error.

[dcharkes]

I found same issue 123

This is a different issue from what you were asking earlier, correct?

Earlier you were asking about using dynamic in Dart, and now you are asking about C++ classes with FFI.

My understanding is that class is not part of ABI, so change class to struct from header file.

Is it right?

Correct, structs are a C concept.

BTW, static variable ( using final ) returns same error.

The same as dynamic? That is very weird because with final it should have the correct type and be able to resolve .ref to the extension method.

[millie-molly]

Alright, I try to change it.
And since ### final cannot find a correct type, I think return the same error.
Anyway, thanks to help me I appreciate it.