How should I return the pointer from rust for create Uint8List in flutter?

[brandon3343]

Problem:
I want to return a pointer to flutter from rust, but it always generates opaque types and I can't get the the pointer.
Scenario:

1. There is a cache at rust that holds various images (Vec<u8>), it may be accessed multiple times, so only gets the image reference (&Vec<u8>).
2. i want return &Vec pointer(*const u8) to flutter for create Uint8List, but it always generates opaque type in flutter.

pub async fn get_cache(&self, key: String) -> *const u8 {
    self.cache.get(&key).unwrap().as_ptr()
}

final vecPointerFromRust = getCache("key") ; // Can't get pointer address Pointer<Uint8>, it's opaque type.
pointer = Pointer.fromAddress(vecPointerFromRust); 
Uint8List image = pointer.asTypedList(length); 

[fzyzcjy]

If you are confident about this (operating on raw pointers can be quite dangerous!), feel free to convert *const u8 into an i64 (int), since it is nothing but an address.

[brandon3343]

pub struct VecU8Ref {
    pub addr: usize,
    pub length: usize,
}

it's works, love you and love you and love you!

[fzyzcjy]

Happy to see it works!