Android Question [SOLVED] USB Accessory - InputStream.BytesAvailable Fails

[Jmu5667]

Hello

I get the following error with this function:

Error occurred on line: 217 (Main)
java.io.IOException: Invalid argument
    at java.io.FileInputStream.available0(Native Method)
    at java.io.FileInputStream.available(FileInputStream.java:383)
    at anywheresoftware.b4a.objects.streams.File$InputStreamWrapper.BytesAvailable(File.java:490)
    at java.lang.reflect.Method.invoke(Native Method)
    at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:732)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:348)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:255)
    at java.lang.reflect.Method.invoke(Native Method)
    at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:144)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:197)
    at anywheresoftware.b4a.debug.Debug.delegate(Debug.java:262)
    at com.ies.ft311d.main._resetport(main.java:603)
    at com.ies.ft311d.main._btnreset_click(main.java:595)
    at java.lang.reflect.Method.invoke(Native Method)
    at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:732)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:351)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:255)
    at java.lang.reflect.Method.invoke(Native Method)
    at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:144)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:197)
    at anywheresoftware.b4a.BA.raiseEvent(BA.java:193)
    at anywheresoftware.b4a.objects.ViewWrapper$1.onClick(ViewWrapper.java:80)
    at android.view.View.performClick(View.java:6669)
    at android.view.View.performClickInternal(View.java:6638)
    at android.view.View.access$3100(View.java:789)
    at android.view.View$PerformClick.run(View.java:26145)
    at android.os.Handler.handleCallback(Handler.java:873)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:193)
    at android.app.ActivityThread.main(ActivityThread.java:6863)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:537)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

And the function is :

Sub readPort As Int

    Dim res As Int
   
    Try
        If UsbAcc(0).InputStream.BytesAvailable > 0 Then
            res =  UsbAcc(0).InputStream.ReadBytes(usbdata,0,usbdata.length)
        End If   
    Catch
        Log($"readPort, error, ${LastException.Message}"$)
    End Try
   
    Return res
   
End Sub

I can read the input stream and get data, however when I put BytesAvailable in so I am not blocking the main thread I get the above error.

The usb device is an FTDI311D GPIO eval board, so this is just a sample app to get this working before it goes in the min production app.

I am using USB lib 0.98

Any suggestions ?

Regards

John.

 

[Erel]

Why aren't you using AsyncStreams?

 

[Jmu5667]

Why aren't you using AsyncStreams?

I fixed it yesterday, sorry I did not update the post, and yes I did implement AsyncStreams, works as expected.