wasm_ffi 2.0.4

A wrapper for wasm which can be used as a drop-in replacement for dart:ffi for Web platform.

example/lib/example.dart

library example;

import 'package:wasm_ffi/ffi.dart';
import 'package:wasm_ffi/ffi_utils.dart';
import 'native_example_bindings.dart';

class Result {
  final String helloStr;
  int sizeOfInt;
  int sizeOfBool;
  int sizeOfPointer;

  Result(this.helloStr, this.sizeOfInt, this.sizeOfBool, this.sizeOfPointer);

  @override
  String toString() {
    return 'hello: $helloStr, int: $sizeOfInt, bool: $sizeOfBool, pointer: $sizeOfPointer';
  }
}

Future<Result> testWasmFfi(String libName, String name) async {
  final library = await DynamicLibrary.open(libName);
  final bindings = NativeExampleBindings(library);

  return using(
    (Arena arena) {
      final cString = name.toNativeUtf8(allocator: arena).cast<Char>();
      final helloStr = bindings.hello(cString).cast<Utf8>().toDartString();
      final sizeOfInt = bindings.intSize();
      final sizeOfBool = bindings.boolSize();
      final sizeOfPointer = bindings.pointerSize();
      return Result(helloStr, sizeOfInt, sizeOfBool, sizeOfPointer);
    },
    library.allocator,
  ); // library.allocator is optional if only one module is loaded
}