B4J Question Is where any way to handle AsyncStream errors?

[kabron]

I use AsyncStream in prefix mode. Everything is OK, but if I open serial port and it's input buffer already contains some data I naturally got application crash with diagnostic like:
"java.lang.NegativeArraySizeException" or similar.

So, I have to reopen port once again to establish connection.

Two questions arise:
1. Is there a way to clear port buffer inside the program before opening connection?
I do not think so.
I could clear it via opening e.g. some terminal emulator, but it is external effort.

2. Is there a way to prevent application crash and handle the error inside the program?

Thanks in advance.

 

[Siam]

hi

you can use:

try
    your code to open the connection
catch
    your code to reopen the  connection
end try

andy

 

[kabron]

Thank you Andy. It is intersng. Not now, tomorrow.

 

[Erel]

You should handle AStream_Error and AStream_Terminated events.

You can call Serial.PurgePort to clear the buffers.

 

[kabron]

Thanks a lot, Erel. Now it's OK. One little unpleasant moment remained. After closing connection I always got a set of messages:

java.lang.InterruptedException: sleep interrupted
    at java.lang.Thread.sleep(Native Method)
    at anywheresoftware.b4j.serial.Serial$1.read(Serial.java:122)
    at anywheresoftware.b4a.randomaccessfile.AsyncStreams$AIN.readNumberOfBytes(AsyncStreams.java:272)
    at anywheresoftware.b4a.randomaccessfile.AsyncStreams$AIN.run(AsyncStreams.java:251)
    at java.lang.Thread.run(Thread.java:745)

It happens at astream.Close command.

I already raised this question long time ago. You told "it's OK don't worry". May be there is solution not to get this?

 

[Erel]

You should ignore it. It will be removed in the next update to serial library.

 

[kabron]

OK
Thanks again