B4J Question Reading GSM modem crashes app

[Beja]

Hi all,
I am using a GSM modem and a friend of mine is helping me with the solution... but he doesn't have the modem
so he couldn't test it.. in my side, when I click the Read GSM button the system crashes or hangs for a very
long time before telling it's not responding!!
Please see the code below and I would appreciate any explanation!

Sub btnRead_Action
         'Read string from GSM modem
          Dim iStream As InputStream
          iStream = sp.GetInputStream
         Dim buffer() As Byte
         Dim count As Int = iStream.ReadBytes(buffer,0,buffer.Length)
         TextArea1.text = BytesToString(buffer,0,buffer.Length,"UTF-8")
End Sub

 

[Erel]

This is exactly why you need to use AsyncStreams. It will never hang your app. Your current code will hang the main thread until there is at least one byte available.

 

[Beja]

I tried to follow your previous advice to use getinputstream and never use asyncstreams.. will check this again and see what did I miss.

 

[Erel]

I tried to follow your previous advice to use getinputstream and never use asyncstream

Sorry for the confusion. You always need to use AsyncStreams.

 

[Beja]

Sorry, I was referring to this:
"If you want to initiate the reading yourself then you should read directly from sp.GetInputStream and not use AsyncStreams at all."
https://www.b4x.com/android/forum/threads/b4j-jserial-initialization-question.66692/#content