Compile error, maybe the dart sdk version ?

[lycstar]

Info: Compiling with sound null safety
lib/src/ffi.dart:23:5: Error: Can't create typedef from non-function type.
    = Pointer<NativeFunction<Void Function(Pointer<Uint8>, UintPtr, Pointer)>>;
    ^
lib/src/ffi.dart:30:39: Error: Can't create typedef from non-function type.
typedef FlutterDesktopMessageCallback = Pointer<
                                      ^
lib/src/ffi.dart:44:50: Error: Can't create typedef from non-function type.
typedef FlutterDesktopPixelBufferTextureCallback = Pointer<
                                                 ^
lib/src/ffi.dart:50:50: Error: Can't create typedef from non-function type.
typedef FlutterDesktopOnPluginRegistrarDestroyed = Pointer<
                                                 ^
lib/src/ffi.dart:23:60: Error: Type 'UintPtr' not found.
    = Pointer<NativeFunction<Void Function(Pointer<Uint8>, UintPtr, Pointer)>>;
                                                           ^^^^^^^
lib/src/ffi.dart:47:13: Error: Type 'UintPtr' not found.
            UintPtr, UintPtr, Pointer)>>;
            ^^^^^^^
lib/src/ffi.dart:47:22: Error: Type 'UintPtr' not found.
            UintPtr, UintPtr, Pointer)>>;
                     ^^^^^^^
lib/src/ffi.dart:192:31: Error: 'UintPtr' isn't a type.
              Pointer<Uint8>, UintPtr)>>('FlutterDesktopMessengerSend');
                              ^^^^^^^
lib/src/ffi.dart:223:15: Error: 'UintPtr' isn't a type.
              UintPtr,
              ^^^^^^^
lib/src/ffi.dart:254:15: Error: 'UintPtr' isn't a type.
              UintPtr)>>('FlutterDesktopMessengerSendResponse');
              ^^^^^^^
lib/src/ffi.dart:79:4: Error: Couldn't find constructor 'UintPtr'.
  @UintPtr()
   ^^^^^^^
lib/src/ffi.dart:89:4: Error: Couldn't find constructor 'UintPtr'.
  @UintPtr()
   ^^^^^^^
lib/src/ffi.dart:103:4: Error: Couldn't find constructor 'UintPtr'.
  @UintPtr()
   ^^^^^^^
lib/src/ffi.dart:107:4: Error: Couldn't find constructor 'UintPtr'.
  @UintPtr()
   ^^^^^^^
lib/src/ffi.dart:80:16: Error: Field 'struct_size' requires exactly one annotation to declare its native type, which cannot be Void. dart:ffi Structs and Unions cannot have regular Dart fields.
  external int struct_size;
               ^
lib/src/ffi.dart:90:16: Error: Field 'message_size' requires exactly one annotation to declare its native type, which cannot be Void. dart:ffi Structs and Unions cannot have regular Dart fields.
  external int message_size;
               ^
lib/src/ffi.dart:104:16: Error: Field 'width' requires exactly one annotation to declare its native type, which cannot be Void. dart:ffi Structs and Unions cannot have regular Dart fields.
  external int width;
               ^
lib/src/ffi.dart:108:16: Error: Field 'height' requires exactly one annotation to declare its native type, which cannot be Void. dart:ffi Structs and Unions cannot have regular Dart fields.
  external int height;
               ^
lib/src/ffi.dart:120:53: Error: Field 'callback' requires exactly one annotation to declare its native type, which cannot be Void. dart:ffi Structs and Unions cannot have regular Dart fields.
  external FlutterDesktopPixelBufferTextureCallback callback;
                                                    ^
lib/src/ffi.dart:194:39: Error: Expected type 'NativeFunction<Int32 Function(Pointer<FlutterDesktopMessenger>, Pointer<Int8>, Pointer<Uint8>, invalid-type)>' to be a valid and instantiated subtype of 'NativeType'.
 - 'NativeFunction' is from 'dart:ffi'.
 - 'Int32' is from 'dart:ffi'.
 - 'Pointer' is from 'dart:ffi'.
 - 'FlutterDesktopMessenger' is from 'package:win32_runner/src/ffi.dart' ('lib/src/ffi.dart').
 - 'Int8' is from 'dart:ffi'.
 - 'Uint8' is from 'dart:ffi'.
      _FlutterDesktopMessengerSendPtr.asFunction<
                                      ^
lib/src/ffi.dart:227:48: Error: Expected type 'NativeFunction<Int32 Function(Pointer<FlutterDesktopMessenger>, Pointer<Int8>, Pointer<Uint8>, invalid-type, invalid-type, Pointer<NativeType>)>' to be a valid and instantiated subtype of 'NativeType'.
 - 'NativeFunction' is from 'dart:ffi'.
 - 'Int32' is from 'dart:ffi'.
 - 'Pointer' is from 'dart:ffi'.
 - 'FlutterDesktopMessenger' is from 'package:win32_runner/src/ffi.dart' ('lib/src/ffi.dart').
 - 'Int8' is from 'dart:ffi'.
 - 'Uint8' is from 'dart:ffi'.
 - 'NativeType' is from 'dart:ffi'.
      _FlutterDesktopMessengerSendWithReplyPtr.asFunction<
                                               ^
lib/src/ffi.dart:256:47: Error: Expected type 'NativeFunction<Void Function(Pointer<FlutterDesktopMessenger>, Pointer<FlutterDesktopMessageResponseHandle>, Pointer<Uint8>, invalid-type)>' to be a valid and instantiated subtype of 'NativeType'.
 - 'NativeFunction' is from 'dart:ffi'.
 - 'Void' is from 'dart:ffi'.
 - 'Pointer' is from 'dart:ffi'.
 - 'FlutterDesktopMessenger' is from 'package:win32_runner/src/ffi.dart' ('lib/src/ffi.dart').
 - 'FlutterDesktopMessageResponseHandle' is from 'package:win32_runner/src/ffi.dart' ('lib/src/ffi.dart').
 - 'Uint8' is from 'dart:ffi'.
      _FlutterDesktopMessengerSendResponsePtr.asFunction<
                                              ^
lib/src/ffi.dart:292:46: Error: Expected type 'NativeFunction<Void Function(Pointer<FlutterDesktopMessenger>, Pointer<Int8>, invalid-type, Pointer<NativeType>)>' to be a valid and instantiated subtype of 'NativeType'.
 - 'NativeFunction' is from 'dart:ffi'.
 - 'Void' is from 'dart:ffi'.
 - 'Pointer' is from 'dart:ffi'.
 - 'FlutterDesktopMessenger' is from 'package:win32_runner/src/ffi.dart' ('lib/src/ffi.dart').
 - 'Int8' is from 'dart:ffi'.
 - 'NativeType' is from 'dart:ffi'.
      _FlutterDesktopMessengerSetCallbackPtr.asFunction<
                                             ^
lib/src/ffi.dart:423:62: Error: Expected type 'NativeFunction<Void Function(Pointer<FlutterDesktopPluginRegistrar>, invalid-type)>' to be a valid and instantiated subtype of 'NativeType'.
 - 'NativeFunction' is from 'dart:ffi'.
 - 'Void' is from 'dart:ffi'.
 - 'Pointer' is from 'dart:ffi'.
 - 'FlutterDesktopPluginRegistrar' is from 'package:win32_runner/src/ffi.dart' ('lib/src/ffi.dart').
      _FlutterDesktopPluginRegistrarSetDestructionHandlerPtr.asFunction<
                                                             ^
Error: AOT compilation failed
Generating AOT kernel dill failed!

Dart SDK version: 2.17.0-49.0.dev (dev) (Sun Jan 23 14:30:49 2022 -0800) on "windows_x64"

[domesticmouse]

This is WFM on latest master Flutter.

PS c:\> dart --version
Dart SDK version: 2.17.0-69.0.dev (dev) (Fri Jan 28 00:44:27 2022 -0800) on "windows_x64"

[timsneath]

There's some flux at the moment with package:ffi adding some types in 1.2.0 that I'd unwittingly used:
https://pub.dev/packages/ffi/versions/1.2.0-dev.0

I think they're about to publish this, but for now, try editing pubspec.yaml to point to this new version of ffi, and you should be good, @lycstar.

[lycstar]

@timsneath ok , but a new error was encountered

Info: Compiling with sound null safety
../../AppData/Local/Pub/Cache/hosted/pub.dartlang.org/win32-2.3.10/lib/src/structs.g.dart:664:31: Error: Member not found: 'UnicodeChar'.
  int get UnicodeChar => Char.UnicodeChar;
                              ^^^^^^^^^^^
../../AppData/Local/Pub/Cache/hosted/pub.dartlang.org/win32-2.3.10/lib/src/structs.g.dart:665:38: Error: Setter not found: 'UnicodeChar'.
  set UnicodeChar(int value) => Char.UnicodeChar = value;
                                     ^^^^^^^^^^^
../../AppData/Local/Pub/Cache/hosted/pub.dartlang.org/win32-2.3.10/lib/src/structs.g.dart:667:29: Error: Member not found: 'AsciiChar'.
  int get AsciiChar => Char.AsciiChar;
                            ^^^^^^^^^
../../AppData/Local/Pub/Cache/hosted/pub.dartlang.org/win32-2.3.10/lib/src/structs.g.dart:668:36: Error: Setter not found: 'AsciiChar'.
  set AsciiChar(int value) => Char.AsciiChar = value;
                                   ^^^^^^^^^
Error: AOT compilation failed
Generating AOT kernel dill failed!

Dart SDK version: 2.17.0-69.0.dev (dev) (Fri Jan 28 00:44:27 2022 -0800) on "windows_x64"

[timsneath]

I'm so glad you reported this, because it helped us track down a nasty potential bug caused by the interplay of some types that were temporarily in both package:ffi and dart:ffi in certain situations (see dart-archive/ffi#133). We fixed the parent package, and commit 3deb30a should fix errors here. Please let me know if this works for you.

[lycstar]

Great, it works! @timsneath