Android Question AsyncStreams_NewStream event

[MartinR]

I'm trying to transfer files from a PC to an Android device. I have managed to do this using VB6 code on the PC, Bluetooth dongle, virtual COM port, B4A serial library, prefix-mode asyncstreams_newdata event.

The FileTransfer example on this forum uses both asynchstreams_newdata and asynchstreams_newstream events, but I cannot get the code to work (cannot get device to connect to PC) so cannot follow exactly what the _newstream event does, when it triggers.

I cannot find any documentation for the _newstream event: it is not mentioned in the B4A book, and I can't I find it covered anywhere else.

I would like to know what it does, how to use it, whether it is easier/better to use than the _newdata event.

Many thanks,

Martin

 

[Erel]

The NewStream event and AStream.WriteStream are explained here: https://www.b4x.com/android/forum/t...nd-and-receive-files-with-asyncstreams.30493/

WriteStream is useful if you need to send large files (5 MB+). For smaller files it is simpler to create a custom type that holds the file bytes ([B4X] Bytes To File) with any other value you need. Serialize it with B4XSerializator and send with WriteData.

Similar to: [B4X] Network + AsyncStreams + B4XSerializator

 

[MartinR]

Am I correct to understand that the NewStream event will only be triggered when it receives a stream generated by Astream.WriteStream? If so, I need to know the details of what a stream generated by WriteStream looks like so that I can send the data from the PC in compliance with that protocol, using VB6 code.

I will stick with the NewData event for now, I think, since the prefix-mode protocol is quite easy to understand/implement.

Many thanks.

 

[Erel]

Am I correct to understand that the NewStream event will only be triggered when it receives a stream generated by Astream.WriteStream?

1. That's true.
2. (Use B4J to develop the PC app. Everything will be simpler).
3. C# implementation of WriteStream: https://www.b4x.com/android/forum/t...ement-asyncstreams-prefix-mode.30741/#content

 

[MartinR]

Thanks for the advice. I have downloaded B4J!