public static extern bool FlutterDesktopMessengerSendWithReply( FlutterDesktopMessengerRef messenger, [MarshalAs(UnmanagedType.LPStr)] string channel, byte[] message, IntPtr message_size, FlutterDesktopBinaryReply reply, IntPtr user_data);
public static extern bool FlutterDesktopMessengerSendWithReply( FlutterDesktopMessenger messenger, string channel, IntPtr message, uint message_size, FlutterDesktopBinaryReply reply, IntPtr user_data);
private DefaultBinaryMessenger(FlutterDesktopMessenger messenger) { _messenger = messenger; _replyCallback = OnReplyMessageReceived; _messageCallback = OnMessageReceived; }