public static extern bool FlutterDesktopMessengerSendWithReply(
FlutterDesktopMessenger messenger,
string channel,
IntPtr message,
uint message_size,
FlutterDesktopBinaryReply reply,
IntPtr user_data);
private async void OnMessageReceived(FlutterDesktopMessenger messenger, IntPtr message, IntPtr userData)
{
var receivedMessage = Marshal.PtrToStructure <FlutterDesktopMessage>(message);
var messageBytes = new byte[receivedMessage.message_size];
Marshal.Copy(receivedMessage.message, messageBytes, 0, (int)receivedMessage.message_size);
if (_handlers.TryGetValue(receivedMessage.channel, out var handler))
{
byte[] replyBytes = await handler(messageBytes);
if (replyBytes != null)
{
using (var pinned = PinnedObject.Get(replyBytes))
{
FlutterDesktopMessengerSendResponse(messenger, receivedMessage.response_handle, pinned.Pointer, (uint)replyBytes.Length);
}
}
else
{
FlutterDesktopMessengerSendResponse(messenger, receivedMessage.response_handle, IntPtr.Zero, 0);
}
}
else
{
FlutterDesktopMessengerSendResponse(messenger, receivedMessage.response_handle, IntPtr.Zero, 0);
}
}
public static extern void FlutterDesktopMessengerSetCallback(
FlutterDesktopMessenger messenger,
string channel,
FlutterDesktopMessageCallback callback,
IntPtr user_data);
public static extern void FlutterDesktopMessengerSendResponse(
FlutterDesktopMessenger messenger,
IntPtr handle,
IntPtr data,
uint data_length);
public static extern bool FlutterDesktopMessengerSend(
FlutterDesktopMessenger messenger,
string channel,
IntPtr message,
uint message_size);
private DefaultBinaryMessenger(FlutterDesktopMessenger messenger)
{
_messenger = messenger;
_replyCallback = OnReplyMessageReceived;
_messageCallback = OnMessageReceived;
}
