WEB APP run time error: MulticastProbe(): calling this function in flutter web app.

[prabakaranios]

We get the below error when calling the MulticastProbe() from the web app.

`bash-3.2$ flutter run
Connected devices:
macOS (desktop) • macos • darwin-arm64 • macOS 14.6.1 23G93 darwin-arm64 (Rosetta)
Mac Designed for iPad (desktop) • mac-designed-for-ipad • darwin • macOS 14.6.1 23G93 darwin-arm64 (Rosetta)
Chrome (web) • chrome • web-javascript • Google Chrome 130.0.6723.117

Checking for wireless devices...

[2]: Mac Designed for iPad (mac-designed-for-ipad)
[3]: Chrome (chrome)
Please choose one (or "q" to quit): 3
Launching lib/main.dart on Chrome in debug mode...
../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart:1:8: Error: Dart library 'dart:ffi' is not available on this platform.
import 'dart:ffi';
^
Context: The unavailable library 'dart:ffi' is imported through these packages:

web_entrypoint.dart => package:iapiapplication => package:easy_onvif => dart:ffi
web_entrypoint.dart => package:iapiapplication => package:easy_onvif => package:ffi => dart:ffi

Detailed import paths for (some of) the these imports:

web_entrypoint.dart => package:iapiapplication/main.dart => package:easy_onvif/onvif.dart => package:easy_onvif/src/multicast_probe.dart => dart:ffi
web_entrypoint.dart => package:iapiapplication/main.dart => package:easy_onvif/onvif.dart => package:easy_onvif/src/multicast_probe.dart => package:ffi/ffi.dart =>
package:ffi/src/allocation.dart => dart:ffi
web_entrypoint.dart => package:iapiapplication/main.dart => package:easy_onvif/onvif.dart => package:easy_onvif/src/multicast_probe.dart => package:ffi/ffi.dart =>
package:ffi/src/arena.dart => dart:ffi
web_entrypoint.dart => package:iapiapplication/main.dart => package:easy_onvif/onvif.dart => package:easy_onvif/src/multicast_probe.dart => package:ffi/ffi.dart =>
package:ffi/src/utf16.dart => dart:ffi
web_entrypoint.dart => package:iapiapplication/main.dart => package:easy_onvif/onvif.dart => package:easy_onvif/src/multicast_probe.dart => package:ffi/ffi.dart =>
package:ffi/src/utf8.dart => dart:ffi

../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:5:8: Error: Dart library 'dart:ffi' is not available on this platform.
import 'dart:ffi';
^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/arena.dart:8:8: Error: Dart library 'dart:ffi' is not available on this platform.
import 'dart:ffi';
^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/utf16.dart:5:8: Error: Dart library 'dart:ffi' is not available on this platform.
import 'dart:ffi';
^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/utf8.dart:6:8: Error: Dart library 'dart:ffi' is not available on this platform.
import 'dart:ffi';
^
../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart:12:42: Error: Type 'Struct' not found.
sealed class _OnvifDiscoveryData extends Struct {
^^^^^^
../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart:13:10: Error: Type 'Int8' not found.
@array(128, 8192)
^^^^
../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart:14:24: Error: Type 'Int8' not found.
external Array<Array> buf;
^^^^
../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart:14:18: Error: Type 'Array' not found.
external Array<Array> buf;
^^^^^
../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart:14:12: Error: Type 'Array' not found.
external Array<Array> buf;
^^^^^
../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart:18:35: Error: Type 'NativeType' not found.
late final int Function(Pointer, Pointer, int)
^^^^^^^^^^
../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart:18:27: Error: Type 'Pointer' not found.
late final int Function(Pointer, Pointer, int)
^^^^^^^
../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart:18:56: Error: Type 'NativeType' not found.
late final int Function(Pointer, Pointer, int)
^^^^^^^^^^
../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart:18:48: Error: Type 'Pointer' not found.
late final int Function(Pointer, Pointer, int)
^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:8:29: Error: Type 'Pointer' not found.
typedef PosixMallocNative = Pointer Function(IntPtr);
^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:8:46: Error: Type 'IntPtr' not found.
typedef PosixMallocNative = Pointer Function(IntPtr);
^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:11:10: Error: Type 'Pointer' not found.
external Pointer posixMalloc(int size);
^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:13:29: Error: Type 'Pointer' not found.
typedef PosixCallocNative = Pointer Function(IntPtr num, IntPtr size);
^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:13:46: Error: Type 'IntPtr' not found.
typedef PosixCallocNative = Pointer Function(IntPtr num, IntPtr size);
^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:13:58: Error: Type 'IntPtr' not found.
typedef PosixCallocNative = Pointer Function(IntPtr num, IntPtr size);
^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:16:10: Error: Type 'Pointer' not found.
external Pointer posixCalloc(int num, int size);
^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:18:27: Error: Type 'Void' not found.
typedef PosixFreeNative = Void Function(Pointer);
^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:18:41: Error: Type 'Pointer' not found.
typedef PosixFreeNative = Void Function(Pointer);
^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:20:9: Error: Type 'Void' not found.
@Native<Void Function(Pointer)>(symbol: 'free')
^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:20:23: Error: Type 'Pointer' not found.
@Native<Void Function(Pointer)>(symbol: 'free')
^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:21:25: Error: Type 'Pointer' not found.
external void posixFree(Pointer ptr);
^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:23:15: Error: Type 'NativeFunction' not found.
final Pointer<NativeFunction> posixFreePointer =
^^^^^^^^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:23:7: Error: Type 'Pointer' not found.
final Pointer<NativeFunction> posixFreePointer =
^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:27:7: Error: Type 'DynamicLibrary' not found.
final DynamicLibrary ole32lib = DynamicLibrary.open('ole32.dll');
^^^^^^^^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:29:35: Error: Type 'Pointer' not found.
typedef WinCoTaskMemAllocNative = Pointer Function(Size);
^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:29:52: Error: Type 'Size' not found.
typedef WinCoTaskMemAllocNative = Pointer Function(Size);
^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:30:29: Error: Type 'Pointer' not found.
typedef WinCoTaskMemAlloc = Pointer Function(int);
^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:35:34: Error: Type 'Void' not found.
typedef WinCoTaskMemFreeNative = Void Function(Pointer);
^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:35:48: Error: Type 'Pointer' not found.
typedef WinCoTaskMemFreeNative = Void Function(Pointer);
^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:36:42: Error: Type 'Pointer' not found.
typedef WinCoTaskMemFree = void Function(Pointer);
^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:37:15: Error: Type 'NativeFunction' not found.
final Pointer<NativeFunction> winCoTaskMemFreePointer =
^^^^^^^^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:37:7: Error: Type 'Pointer' not found.
final Pointer<NativeFunction> winCoTaskMemFreePointer =
^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:48:40: Error: Type 'Allocator' not found.
final class MallocAllocator implements Allocator {
^^^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:60:3: Error: Type 'Pointer' not found.
Pointer allocate(int byteCount, {int? alignment}) {
^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:60:33: Error: Type 'NativeType' not found.
Pointer allocate(int byteCount, {int? alignment}) {
^^^^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:79:13: Error: Type 'Pointer' not found.
void free(Pointer pointer) {
^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:115:11: Error: Type 'NativeFinalizerFunction' not found.
Pointer get nativeFree =>
^^^^^^^^^^^^^^^^^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:115:3: Error: Type 'Pointer' not found.
Pointer get nativeFree =>
^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:134:40: Error: Type 'Allocator' not found.
final class CallocAllocator implements Allocator {
^^^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:138:20: Error: Type 'Pointer' not found.
void _fillMemory(Pointer destination, int length, int fill) {
^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:147:20: Error: Type 'Pointer' not found.
void _zeroMemory(Pointer destination, int length) =>
^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:160:3: Error: Type 'Pointer' not found.
Pointer allocate(int byteCount, {int? alignment}) {
^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:160:33: Error: Type 'NativeType' not found.
Pointer allocate(int byteCount, {int? alignment}) {
^^^^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:182:13: Error: Type 'Pointer' not found.
void free(Pointer pointer) {
^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:218:11: Error: Type 'NativeFinalizerFunction' not found.
Pointer get nativeFree =>
^^^^^^^^^^^^^^^^^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:218:3: Error: Type 'Pointer' not found.
Pointer get nativeFree =>
^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/arena.dart:24:24: Error: Type 'Allocator' not found.
class Arena implements Allocator {
^^^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/arena.dart:26:9: Error: Type 'Allocator' not found.
final Allocator _wrappedAllocator;
^^^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/arena.dart:29:22: Error: Type 'NativeType' not found.
final List<Pointer> _managedMemoryPointers = [];
^^^^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/arena.dart:29:14: Error: Type 'Pointer' not found.
final List<Pointer> _managedMemoryPointers = [];
^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/arena.dart:40:10: Error: Type 'Allocator' not found.
Arena([Allocator allocator = calloc]) : _wrappedAllocator = allocator;
^^^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/arena.dart:50:3: Error: Type 'Pointer' not found.
Pointer allocate(int byteCount, {int? alignment}) {
^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/arena.dart:50:33: Error: Type 'NativeType' not found.
Pointer allocate(int byteCount, {int? alignment}) {
^^^^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/arena.dart:101:21: Error: Type 'NativeType' not found.
void free(Pointer pointer) {}
^^^^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/arena.dart:101:13: Error: Type 'Pointer' not found.
void free(Pointer pointer) {}
^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/arena.dart:120:6: Error: Type 'Allocator' not found.
[Allocator wrappedAllocator = calloc]) {
^^^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/arena.dart:144:6: Error: Type 'Allocator' not found.
[Allocator wrappedAllocator = calloc]) {
^^^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/utf16.dart:15:27: Error: Type 'Opaque' not found.
final class Utf16 extends Opaque {}
^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/utf16.dart:18:27: Error: Type 'Pointer' not found.
extension Utf16Pointer on Pointer {
^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/utf16.dart:51:46: Error: Type 'Uint16' not found.
static String _toKnownLengthString(Pointer codeUnits, int length) =>
^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/utf16.dart:51:38: Error: Type 'Pointer' not found.
static String _toKnownLengthString(Pointer codeUnits, int length) =>
^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/utf16.dart:54:48: Error: Type 'Uint16' not found.
static String _toUnknownLengthString(Pointer codeUnits) {
^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/utf16.dart:54:40: Error: Type 'Pointer' not found.
static String _toUnknownLengthString(Pointer codeUnits) {
^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/utf16.dart:67:30: Error: Type 'Uint16' not found.
static int _length(Pointer codeUnits) {
^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/utf16.dart:67:22: Error: Type 'Pointer' not found.
static int _length(Pointer codeUnits) {
^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/utf16.dart:92:3: Error: Type 'Pointer' not found.
Pointer toNativeUtf16({Allocator allocator = malloc}) {
^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/utf16.dart:92:33: Error: Type 'Allocator' not found.
Pointer toNativeUtf16({Allocator allocator = malloc}) {
^^^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/utf8.dart:15:26: Error: Type 'Opaque' not found.
final class Utf8 extends Opaque {}
^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/utf8.dart:18:26: Error: Type 'Pointer' not found.
extension Utf8Pointer on Pointer {
^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/utf8.dart:51:30: Error: Type 'Uint8' not found.
static int _length(Pointer codeUnits) {
^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/utf8.dart:51:22: Error: Type 'Pointer' not found.
static int _length(Pointer codeUnits) {
^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/utf8.dart:80:3: Error: Type 'Pointer' not found.
Pointer toNativeUtf8({Allocator allocator = malloc}) {
^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/utf8.dart:80:31: Error: Type 'Allocator' not found.
Pointer toNativeUtf8({Allocator allocator = malloc}) {
^^^^^^^^^
../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart:11:2: Error: Couldn't find constructor 'Packed'.
@PACKED(1)
^^^^^^
../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart:13:10: Error: 'Int8' isn't a type.
@array(128, 8192)
^^^^
../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart:13:4: Error: Couldn't find constructor 'Array'.
@array(128, 8192)
^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:10:2: Error: Couldn't find constructor 'Native'.
@Native(symbol: 'malloc')
^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:15:2: Error: Couldn't find constructor 'Native'.
@Native(symbol: 'calloc')
^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:20:9: Error: 'Void' isn't a type.
@Native<Void Function(Pointer)>(symbol: 'free')
^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:20:23: Error: 'Pointer' isn't a type.
@Native<Void Function(Pointer)>(symbol: 'free')
^^^^^^^
../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:20:2: Error: Couldn't find constructor 'Native'.
@Native<Void Function(Pointer)>(symbol: 'free')
^^^^^^
../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart:14:24: Error: 'Int8' isn't a type.
external Array<Array> buf;
^^^^
../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart:14:18: Error: 'Array' isn't a type.
external Array<Array> buf;
^^^^^
../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart:14:12: Error: 'Array' isn't a type.
external Array<Array> buf;
^^^^^
../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart:18:35: Error: 'NativeType' isn't a type.
late final int Function(Pointer, Pointer, int)
^^^^^^^^^^
../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart:18:27: Error: 'Pointer' isn't a type.
late final int Function(Pointer, Pointer, int)
^^^^^^^
../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart:18:56: Error: 'NativeType' isn't a type.
late final int Function(Pointer, Pointer, int)
^^^^^^^^^^
../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart:18:48: Error: 'Pointer' isn't a type.
late final int Function(Pointer, Pointer, int)
^^^^^^^
../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart:69:41: Error: 'NativeType' isn't a type.
final Pointer Function(String symbolName) lookup =
^^^^^^^^^^
../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart:69:11: Error: 'Pointer' isn't a type.
final Pointer Function(String symbolName) lookup =
^^^^^^^
../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart:76:13: Error: 'Int32' isn't a type.
Int32 Function(
^^^^^
../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart:77:23: Error: 'NativeType' isn't a type.
Pointer,
^^^^^^^^^^
../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart:77:15: Error: 'Pointer' isn't a type.
Pointer,
^^^^^^^
../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart:78:23: Error: 'NativeType' isn't a type.
Pointer,
^^^^^^^^^^
../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart:78:15: Error: 'Pointer' isn't a type.
Pointer,
^^^^^^^
../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart:79:15: Error: 'Int32' isn't a type.
Int32,
^^^^^
../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart:75:9: Error: 'NativeFunction' isn't a type.
NativeFunction<
^^^^^^^^^^^^^^
../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart:84:19: Error: 'NativeType' isn't a type.
Pointer,
^^^^^^^^^^
../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart:84:11: Error: 'Pointer' isn't a type.
Pointer,
^^^^^^^
../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart:85:19: Error: 'NativeType' isn't a type.
Pointer,
^^^^^^^^^^
../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart:85:11: Error: 'Pointer' isn't a type.
Pointer,
^^^^^^^
../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart:71:14: Error: The getter 'DynamicLibrary' isn't defined for the class 'MulticastProbe'.

• 'MulticastProbe' is from 'package:easy_onvif/src/multicast_probe.dart' ('../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart').
  Try correcting the name to the name of an existing getter, or defining a getter or field named 'DynamicLibrary'.
  return DynamicLibrary.open(discoveryDllPath).lookup;
  ^^^^^^^^^^^^^^
  ../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart:154:24: Error: The method 'call' isn't defined for the class 'CallocAllocator'.
• 'CallocAllocator' is from 'package:ffi/src/allocation.dart' ('../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart').
  Try correcting the name to the name of an existing method, or defining a method named 'call'.
  final data = calloc<_OnvifDiscoveryData>();
  ^
  ../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart:163:11: Error: The getter 'Pointer' isn't defined for the class 'MulticastProbe'.
• 'MulticastProbe' is from 'package:easy_onvif/src/multicast_probe.dart' ('../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart').
  Try correcting the name to the name of an existing getter, or defining a getter or field named 'Pointer'.
  Pointer.fromAddress(data.address + index * 8192)
  ^^^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:21:25: Error: 'Pointer' isn't a type.
  external void posixFree(Pointer ptr);
  ^^^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:23:15: Error: 'NativeFunction' isn't a type.
  final Pointer<NativeFunction> posixFreePointer =
  ^^^^^^^^^^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:23:7: Error: 'Pointer' isn't a type.
  final Pointer<NativeFunction> posixFreePointer =
  ^^^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:24:5: Error: Undefined name 'Native'.
  Native.addressOf(posixFree);
  ^^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:27:7: Error: 'DynamicLibrary' isn't a type.
  final DynamicLibrary ole32lib = DynamicLibrary.open('ole32.dll');
  ^^^^^^^^^^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:27:33: Error: Undefined name 'DynamicLibrary'.
  final DynamicLibrary ole32lib = DynamicLibrary.open('ole32.dll');
  ^^^^^^^^^^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:37:15: Error: 'NativeFunction' isn't a type.
  final Pointer<NativeFunction> winCoTaskMemFreePointer =
  ^^^^^^^^^^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:37:7: Error: 'Pointer' isn't a type.
  final Pointer<NativeFunction> winCoTaskMemFreePointer =
  ^^^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:61:5: Error: 'Pointer' isn't a type.
  Pointer result;
  ^^^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:79:13: Error: 'Pointer' isn't a type.
  void free(Pointer pointer) {
  ^^^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:138:20: Error: 'Pointer' isn't a type.
  void _fillMemory(Pointer destination, int length, int fill) {
  ^^^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:139:34: Error: 'Uint8' isn't a type.
  final ptr = destination.cast();
  ^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:147:20: Error: 'Pointer' isn't a type.
  void _zeroMemory(Pointer destination, int length) =>
  ^^^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:161:5: Error: 'Pointer' isn't a type.
  Pointer result;
  ^^^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:182:13: Error: 'Pointer' isn't a type.
  void free(Pointer pointer) {
  ^^^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/arena.dart:26:9: Error: 'Allocator' isn't a type.
  final Allocator _wrappedAllocator;
  ^^^^^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/arena.dart:29:22: Error: 'NativeType' isn't a type.
  final List<Pointer> _managedMemoryPointers = [];
  ^^^^^^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/arena.dart:29:14: Error: 'Pointer' isn't a type.
  final List<Pointer> _managedMemoryPointers = [];
  ^^^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/arena.dart:40:10: Error: 'Allocator' isn't a type.
  Arena([Allocator allocator = calloc]) : _wrappedAllocator = allocator;
  ^^^^^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/arena.dart:101:21: Error: 'NativeType' isn't a type.
  void free(Pointer pointer) {}
  ^^^^^^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/arena.dart:101:13: Error: 'Pointer' isn't a type.
  void free(Pointer pointer) {}
  ^^^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/arena.dart:120:6: Error: 'Allocator' isn't a type.
  [Allocator wrappedAllocator = calloc]) {
  ^^^^^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/arena.dart:144:6: Error: 'Allocator' isn't a type.
  [Allocator wrappedAllocator = calloc]) {
  ^^^^^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/utf16.dart:25:28: Error: 'Uint16' isn't a type.
  final codeUnits = cast();
  ^^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/utf16.dart:42:28: Error: 'Uint16' isn't a type.
  final codeUnits = cast();
  ^^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/utf16.dart:51:46: Error: 'Uint16' isn't a type.
  static String _toKnownLengthString(Pointer codeUnits, int length) =>
  ^^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/utf16.dart:51:38: Error: 'Pointer' isn't a type.
  static String _toKnownLengthString(Pointer codeUnits, int length) =>
  ^^^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/utf16.dart:54:48: Error: 'Uint16' isn't a type.
  static String _toUnknownLengthString(Pointer codeUnits) {
  ^^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/utf16.dart:54:40: Error: 'Pointer' isn't a type.
  static String _toUnknownLengthString(Pointer codeUnits) {
  ^^^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/utf16.dart:67:30: Error: 'Uint16' isn't a type.
  static int _length(Pointer codeUnits) {
  ^^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/utf16.dart:67:22: Error: 'Pointer' isn't a type.
  static int _length(Pointer codeUnits) {
  ^^^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/utf16.dart:92:33: Error: 'Allocator' isn't a type.
  Pointer toNativeUtf16({Allocator allocator = malloc}) {
  ^^^^^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/utf16.dart:94:30: Error: 'Uint16' isn't a type.
  final result = allocator(units.length + 1);
  ^^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/utf8.dart:25:28: Error: 'Uint8' isn't a type.
  final codeUnits = cast();
  ^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/utf8.dart:42:28: Error: 'Uint8' isn't a type.
  final codeUnits = cast();
  ^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/utf8.dart:51:30: Error: 'Uint8' isn't a type.
  static int _length(Pointer codeUnits) {
  ^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/utf8.dart:51:22: Error: 'Pointer' isn't a type.
  static int _length(Pointer codeUnits) {
  ^^^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/utf8.dart:80:31: Error: 'Allocator' isn't a type.
  Pointer toNativeUtf8({Allocator allocator = malloc}) {
  ^^^^^^^^^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/utf8.dart:82:30: Error: 'Uint8' isn't a type.
  final result = allocator(units.length + 1);
  ^^^^^
  ../../../.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart:14:31: Error: Only JS interop members may be 'external'.
  Try removing the 'external' keyword or adding a JS interop annotation.
  external Array<Array> buf;
  ^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:11:18: Error: Only JS interop members may be 'external'.
  Try removing the 'external' keyword or adding a JS interop annotation.
  external Pointer posixMalloc(int size);
  ^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:16:18: Error: Only JS interop members may be 'external'.
  Try removing the 'external' keyword or adding a JS interop annotation.
  external Pointer posixCalloc(int num, int size);
  ^
  ../../../.pub-cache/hosted/pub.dev/ffi-2.1.3/lib/src/allocation.dart:21:15: Error: Only JS interop members may be 'external'.
  Try removing the 'external' keyword or adding a JS interop annotation.
  external void posixFree(Pointer ptr);
  ^
  Unhandled exception:
  Unsupported operation: Unsupported invalid type InvalidType() (InvalidType). Encountered while compiling
  file:///Users/vvdn/.pub-cache/hosted/pub.dev/easy_onvif-3.0.1+1/lib/src/multicast_probe.dart, which contains the type: InvalidType().
  #0 ProgramCompiler._typeCompilationError (package:dev_compiler/src/kernel/compiler.dart:3224)
  onvif NVT initialize: Exception: DioError [DioErrorType.other]: SocketException  #1 ProgramCompiler._emitType (package:dev_compiler/src/kernel/compiler.dart:3185)
  Unhandled Exception: type 'Null' is not a subtype of type 'Map<String, dynamic>' in type cast #2 ProgramCompiler._emitClassSignature (package:dev_compiler/src/kernel/compiler.dart:1556)
  HttpException: Invalid response line #3 ProgramCompiler._emitClassDeclaration (package:dev_compiler/src/kernel/compiler.dart:962)
  Unhandled Exception: type 'Null' is not a subtype of type 'Map<String, dynamic>' in type cast #4 ProgramCompiler._emitClass (package:dev_compiler/src/kernel/compiler.dart:819)
  Issue 4 #5 List.forEach (dart:core-patch/growable_array.dart:417)
  DioError [DioErrorType.other]: HttpException: Connection closed before full header was received #6 ProgramCompiler._emitLibrary (package:dev_compiler/src/kernel/compiler.dart:757)
  ONVIF SOAP faults do not match the spec they refer to on some devices #7 List.forEach (dart:core-patch/growable_array.dart:417)
  HttpException: Invalid response line #8 ProgramCompiler.emitModule (package:dev_compiler/src/kernel/compiler.dart:486)
  Can't build apk on example #9 IncrementalJavaScriptBundler.compile (package:frontend_server/src/javascript_bundle.dart:221)
  [GetProfiles] DioError [DioErrorType.other]: HttpException: Connection closed before full header was received. #10 FrontendCompiler.writeJavaScriptBundle (package:frontend_server/frontend_server.dart:870)

#11 FrontendCompiler.compile (package:frontend_server/frontend_server.dart:685) #12 listenAndCompile. (package:frontend_server/frontend_server.dart:1385) the Dart compiler exited unexpectedly. Waiting for connection from debug service on Chrome... 4.1s Failed to compile application.`

### Flutter version Detail:
bash-3.2$ flutter --version Flutter 3.24.5 • channel stable • https://github.com/flutter/flutter.git Framework • revision dec2ee5c1f (6 days ago) • 2024-11-13 11:13:06 -0800 Engine • revision a18df97ca5 Tools • Dart 3.5.4 • DevTools 2.37.3

Please help with this. Thanks.

[faithoflifedev]

Hi @prabakaranios,

Two things:

1. You are not running the current version of the package v3.1.1+1
2. The expected result is an error, since many network operations are blocked when dart code is run within a browser.

I recommend running the example on iOS, Android or Desktop if you want to use the WS-Discovery capabilities of the library.