B4J Question Read ProductId and VendorId of USB/serial adapters

[raphaelcno]

If I have several USB/serial adapters connected to my computer, I would like to read their ProductId and VendorId, in order to open the correct COM port (jSerial library).

In B4A I have previously used the USB library with UsbDevice.ProductId ( https://www.b4x.com/android/forum/t...y-2-0-supports-more-devices.28176/post-286434 ).

Is there a similar method in B4J?

Raphaël

 

[drgottjr]

have you seen this ?

 

[raphaelcno]

have you seen this ?

Thank you for the link to jSSC
As far as I can see, jSSC doesn't give access to ProductId and VendorId.
The jSerial library is already based on jSSC.

 

[drgottjr]

i don't know how good you are with this stuff, but apparently jssc does support access to ProductId and VendorId.
check here those properties are specifically mentioned. the issue seems to be windows, but some quick research implies that success is possible.
i have no interest; just passing the information along in the spirit of a fellow traveler.

 

[raphaelcno]

Thank you

On https://github.com/gohai/java-simpl.../processing/src/java/jssc/SerialPortList.java I found this code related to "idVendor" and "idProduct":

    public static Map<String, String> getPortProperties(String portName) {
        if(SerialNativeInterface.getOsType() == SerialNativeInterface.OS_LINUX) {
            return getLinuxPortProperties(portName);
        } else if(SerialNativeInterface.getOsType() == SerialNativeInterface.OS_MAC_OS_X) {
            return getNativePortProperties(portName);
        } else if(SerialNativeInterface.getOsType() == SerialNativeInterface.OS_WINDOWS){
            // TODO
            return new HashMap<String, String>();
        } else {
            return new HashMap<String, String>();
        }
    }

    public static Map<String, String> getLinuxPortProperties(String portName) {
        Map<String, String> props = new HashMap<String, String>();
        try {
            // portName has the format /dev/ttyUSB0
            String dev = portName.split("/")[2];
            File sysfsNode = new File("/sys/bus/usb-serial/devices/"+dev);

            // resolve the symbolic link and store the resulting components in an array
            String[] sysfsPath = sysfsNode.getCanonicalPath().split("/");

            // walk the tree to the root
            for (int i=sysfsPath.length-2; 0 < i; i--) {
                String curPath = "/";
                for (int j=1; j <= i; j++) {
                    curPath += sysfsPath[j]+"/";
                }

                // look for specific attributes
                String[] attribs = { "idProduct", "idVendor", "manufacturer", "product", "serial" };
                for (int j=0; j < attribs.length; j++) {
                    try {
                        Scanner in = new Scanner(new FileReader(curPath+attribs[j]));
                        // we treat the values just as strings
                        props.put(attribs[j], in.next());
                    } catch (Exception e) {
                        // ignore the attribute
                    }
                }

                // stop once we have at least one attribute
                if (0 < props.size()) {
                    break;
                }
            }
        } catch (Exception e) {
            // nothing to do, return what we have so far
        }
        return props;
    }

    public static Map<String, String> getNativePortProperties(String portName) {
        Map<String, String> props = new HashMap<String, String>();
        try {
            // use JNI functions to read those properties
            String[] names = { "idProduct", "idVendor", "manufacturer", "product", "serial" };
            String[] values = SerialNativeInterface.getPortProperties(portName);

            for (int i=0; i < names.length; i++) {
                if (values[i] != null) {
                    props.put(names[i], values[i]);
                }
            }
        } catch (Exception e) {
            // nothing to do, return what we have so far
        }
        return props;
    }

As for now, this seems to be a little beyond my knowledge level.
Maybe in the future I will be able to use it

 

[Erel]

It is not implemented in Windows. It will return an empty map.

 

[Erel]

Check the updated "B4R Serial Connector": https://www.b4x.com/android/forum/threads/tool-external-serial-connector.65724/

It calls a small .Net console app that prints the ports descriptions.

 

[raphaelcno]

Thank you, that looks very interesting! ?

If I understand correctly, I have to copy the 'ListPorts.exe' file from 'Files' directory (in B4R_Serial_Connector project) to 'Files' directory in my B4J project directory, then select the jShell library in my project, and use following lines in the code:

Sub Process_Globals
    Private serial As Serial
    Private PortsNames As B4XOrderedMap
    Private DataFolder As String
End Sub

Sub AppStart (Form1 As Form, Args() As String)
    DataFolder = File.DirData("xxxxxAppName")
    serial.Initialize("")
    Wait For (GetPortsNames) Complete (unused As Boolean)
End Sub

Sub GetPortsNames As ResumableSub
    PortsNames.Initialize
    For Each port As String In serial.ListPorts
        PortsNames.Put(port, port) 'default names  ' COM4, COM4
    Next
    ' Copy 'ListPorts.exe' from compiled jar file to DirData directory
    File.Copy(File.DirAssets, "ListPorts.exe", DataFolder, "ListPorts.exe")
    ' Use Shell to run 'ListPorts.exe'
    Dim shl As Shell
    shl.Initialize("shl", File.Combine(DataFolder, "ListPorts.exe"), Null)
    shl.Run(5000)
    ' Wait for the process to be completed, read StdOut output and extract port names and descriptions
    Wait For shl_ProcessCompleted (Success As Boolean, ExitCode As Int, StdOut As String, StdErr As String)
    If Success And ExitCode = 0 Then
        For Each line As String In Regex.Split(CRLF, StdOut)
            Log(line)
            Dim i As Int = line.IndexOf(" ")
            If i = -1 Then Continue
            Dim port As String = line.SubString2(0, i)  ' COM4
            Dim Description As String = line.Trim       ' COM4 Silicon Labs CP210x ...
            If PortsNames.ContainsKey(port) Then PortsNames.Put(port, Description)  ' COM4, COM4 Silicon Labs CP210x ...
        Next
    End If
    Return True
End Sub

 

[Erel]

True.