B4J Question Trying to read CPU info on RPI

[Gary Miyakawa]

Ok, I'm trying to read the CPU Serial number (RPI) with this code but keep getting "Invalid Argument" when it trys to perform the ReadList. I've tried all the "reads" and get the same thing.

sub ReadCPUInfo As String
    Dim list1 As List
    list1 = File.ReadList("/proc", "cpuinfo")
End Sub

This code works fine reading the CPU Temp.

Any ideas/suggestions would be greatfully appreciated !

Gary M

 

[Erel]

Can you post the full error message from the logs?

 

[Gary Miyakawa]

This is what I get from the logs.

Waiting for debugger to connect...
Program started.

Error occurred on line: 40 (Main)
java.io.IOException: Invalid argument
at java.io.FileInputStream.available(Native Method)
at java.io.BufferedInputStream.read(BufferedInputStream.java:353)
at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:284)
at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:326)
at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:178)
at java.io.InputStreamReader.read(InputStreamReader.java:184)
at java.io.BufferedReader.fill(BufferedReader.java:161)
at java.io.BufferedReader.readLine(BufferedReader.java:324)
at java.io.BufferedReader.readLine(BufferedReader.java:389)
at anywheresoftware.b4a.objects.streams.File$TextReaderWrapper.ReadLine(File.java:563)
at anywheresoftware.b4a.objects.streams.File$TextReaderWrapper.ReadList(File.java:604)
at anywheresoftware.b4a.objects.streams.File.ReadList(File.java:244)
at b4j.example.main._readcpuinfo(main.java:136)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:613)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:228)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:159)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:90)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:93)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:77)
at b4j.example.main.main(main.java:29)

 

[Erel]

Looks like it doesn't behave exactly like a file stream.

Before switching to jShell, try this:

Dim in As InputStream
Dim jo As JavaObject
in = jo.InitializeNewInstance("java.io.FileInputStream", Array(File.Combine("/proc", "cpuinfo"))) 'create an unbuffered stream
Dim out As OutputStream
out.InitializeToBytesArray(0)
File.Copy2(in, out)
Dim output() As Byte = out.ToBytesArray
Log(BytesToString(output, 0, output.Length, "ascii"))

 

[Gary Miyakawa]

Erel,

As usual, you have the right answer right off the bat ! It works perfectly.

What was the problem using my method ?

Thank you !

Gary Miyakawa

 

[Erel]

Your code is correct. The problem is that you are not reading from a real file and apparently it doesn't support the "available" method that is used internally by the buffered stream.