We Keep Coding

Zebra RFID API Read Access Operation Code return null

I'm trying to develop a small Application for a Zebra handheld rfid reader and can't find a way to access the MemoryBank of the tag. My reader configuration is as follows:
private void ConfigureReader() {
if (reader.isConnected()) {
TriggerInfo triggerInfo = new TriggerInfo();
triggerInfo.StartTrigger.setTriggerType(START_TRIGGER_TYPE.START_TRIGGER_TYPE_IMMEDIATE);
triggerInfo.StopTrigger.setTriggerType(STOP_TRIGGER_TYPE.STOP_TRIGGER_TYPE_IMMEDIATE);
try {
// receive events from reader
if (eventHandler == null){
eventHandler = new EventHandler();
}
reader.Events.addEventsListener(eventHandler);
// HH event
reader.Events.setHandheldEvent(true);
// tag event with tag data
reader.Events.setTagReadEvent(true);
reader.Events.setAttachTagDataWithReadEvent(true);
// set trigger mode as rfid so scanner beam will not come
reader.Config.setTriggerMode(ENUM_TRIGGER_MODE.RFID_MODE, true);
// set start and stop triggers
reader.Config.setStartTrigger(triggerInfo.StartTrigger);
reader.Config.setStopTrigger(triggerInfo.StopTrigger);
} catch (InvalidUsageException e) {
e.printStackTrace();
} catch (OperationFailureException e) {
e.printStackTrace();
}
}
}
And the eventReadNotify looks like this:
public void eventReadNotify(RfidReadEvents e) {
// Recommended to use new method getReadTagsEx for better performance in case of large tag population
TagData[] myTags = reader.Actions.getReadTags(100);
if (myTags != null) {
for (int index = 0; index < myTags.length; index++) {
Log.d(TAG, "Tag ID " + myTags[index].getTagID());
ACCESS_OPERATION_CODE aoc = myTags[index].getOpCode();
ACCESS_OPERATION_STATUS aos = myTags[index].getOpStatus();
if (aoc == ACCESS_OPERATION_CODE.ACCESS_OPERATION_READ && aos == ACCESS_OPERATION_STATUS.ACCESS_SUCCESS) {
if (myTags[index].getMemoryBankData().length() > 0) {
Log.d(TAG, " Mem Bank Data " + myTags[index].getMemoryBankData());
}
}
}
}
}
When I'm scanning a tag I get the correct TagID but both myTags[index].getOpCode() and myTags[index].getOpStatus() return null values.
I appreciate every suggestion that might lead to a successful scan.
Thanks.

I managed to find a solution for my problem. To perform any Read or Write task with Zebra Handheld Scanners the following two conditions must be satisfied. Look here for reference: How to write to RFID tag using RFIDLibrary by Zebra?
// make sure Inventory is stopped
reader.Actions.Inventory.stop();
// make sure DPO is disabled
reader.Config.setDPOState(DYNAMIC_POWER_OPTIMIZATION.DISABLE);
You have to stop the inventory and make sure to disable dpo in order to get data other than the TagID from a Tag. Unfortunately this isn't mentioned in the docu for Reading RFID Tags.

Accessing PowerDesigner Repository Models via COM

I have been trying to get live models directly from the PowerDesigner repository using the COM API without success. Here's what I've been trying in VBA:
Set pd = CreateObject("PowerDesigner.Application")
Set conn = pd.RepositoryConnection
conn.Open "", "", "ShhMahPW"
Set model = conn.FindChildByPath("Program/Project/Logical Models/MahLOM", PdOOM_Classes.cls_Model)
MsgBox model.ShortDescription 'This fails because model is null!
Similarly, I've been trying the same thing in Eclipse with the Java COM bridge:
Application pd = this.getApplicationHook();
//Make live connection to proxy repository
RepositoryConnection conn = new RepositoryConnection( pd.GetRepositoryConnection() );
conn.Open( "", "", ConnectionParams.PASSWORD );
BaseObject model = conn.FindChildByPath( "Program/Project/Logical Models/MahLOM",
PdOOM_Classes.cls_Model );
//Null model, COMException: "Action can not be performed. result = -2147467259"
System.out.println( model.GetShortDescription() )
Can someone please suggest a good way of diving into the repository? I have been able to confirm that I have a connection to the repo and then list the children at that top level. I am struggling to dig into folders beyond the root level. Thanks!

I knew that the model I was looking to pull down from the repo already existed in my local workspace. Really this was a refresh of the local workspaces models. To perform this, the method UpdateFromRepository() can be used!
So what I can do then is get a handle to the local PowerDesigner model and then call for an update before retrieving children. Note the casting from BaseObject to BaseModel for the sake of the refresh...
private BaseObject getModel(){
Application pd = this.getApplicationHook();
model = pd.OpenModel(this.basePath + this.modelName);
System.out.println( "Retrieving model updates from repository... ");
RepositoryConnection conn = new RepositoryConnection( pd.GetRepositoryConnection() );
conn.Open( "", "", ConnectionParams.PASSWORD);
boolean success = new BaseModel(model).UpdateFromRepository();
if( success )
System.out.println( "Update successful!" );
else
System.out.println( "Update failed. Check PowerDesigner settings." );
return this.model;
}

Your main problem is that the search ChildKind should be Cls_RepositoryModel, instead of PdOOM_Class.cls_Model.
option explicit
' assuming we're already connected
if RepositoryConnection.Connected then
Descent RepositoryConnection,""
end if
dim c
set c = RepositoryConnection.FindChildByPath("Folder_7/ConceptualDataModel_1", Cls_RepositoryModel)
if not c is nothing then
output "*** found object " & c.classname
end if
sub Descent(obj,ofs)
output ofs & obj.name & " - " & obj.ObjectType & " - " & obj.ClassName
if obj.ObjectType = "RepositoryModel" then exit sub
if obj.PermanentID = 3 then exit sub ' to save time, don't enter Library
if not obj.HasCollection("ChildObjects") then exit sub
dim c
for each c in obj.ChildObjects
Descent c,ofs & " "
next
end sub

What is the proper way to check if a file/folder in a Box account is read-only using the Box Android library (apiV2)?

I am working on an android app used to access a Box account. The problem I am facing is how to determine a folder/file in the user's account is read only (shared with him/her as a Viewer) so that the upload/delete operations can be disabled.
What I currently do is:
1) Get the items in a folder:
BoxCollection itemsCollection = _boxClient.getFoldersManager()
.getFolderItems(folderId, folderContentRequest);
String userMail = ...
ArrayList<BoxTypedObject> result = null;
2) Determine which one is folder, get it's collaborations, check if it's accessible by the logged-in user, and check whether he is an editor:
if (itemsCollection != null) {
result = itemsCollection.getEntries();
for(BoxTypedObject boxObject : result) {
if(boxObject instanceof BoxAndroidFolder) {
BoxAndroidFolder folder = (BoxAndroidFolder)boxObject;
List<BoxCollaboration> folderCollaborations = _boxClient.getFoldersManager().getFolderCollaborations(folder.getId(), null);
for(BoxCollaboration collaboration : folderCollaborations) {
if( userMail.equalsIgnoreCase(collaboration.getAccessibleBy().getLogin()) &&
!BoxCollaborationRole.EDITOR.equalsIgnoreCase(collaboration.getRole()))
System.out.println("" + folder.getName() + " is readonly");
}
}
}
}
So, is there a simpler and faster (fewer requests) way to get that property of a folder with the android SDK?

You can first check the owner of the folder (folder.getOwnedBy()), if it's the current user then you don't need to check collaborations. However if it's not the current user you'll have to check collaborations.

Java ProgramCall.run hangs

Busy trying to Call RPG function from Java and got this example from JamesA. But now I am having trouble, here is my code:
AS400 system = new AS400("MachineName");
ProgramCall program = new ProgramCall(system);
try
{
// Initialise the name of the program to run.
String programName = "/QSYS.LIB/LIBNAME.LIB/FUNNAME.PGM";
// Set up the 3 parameters.
ProgramParameter[] parameterList = new ProgramParameter[2];
// First parameter is to input a name.
AS400Text OperationsItemId = new AS400Text(20);
parameterList[0] = new ProgramParameter(OperationsItemId.toBytes("TestID"));
AS400Text CaseMarkingValue = new AS400Text(20);
parameterList[1] = new ProgramParameter(CaseMarkingValue.toBytes("TestData"));
// Set the program name and parameter list.
program.setProgram(programName, parameterList);
// Run the program.
if (program.run() != true)
{
// Report failure.
System.out.println("Program failed!");
// Show the messages.
AS400Message[] messagelist = program.getMessageList();
for (int i = 0; i < messagelist.length; ++i)
{
// Show each message.
System.out.println(messagelist[i]);
}
}
// Else no error, get output data.
else
{
AS400Text text = new AS400Text(50);
System.out.println(text.toObject(parameterList[1].getOutputData()));
System.out.println(text.toObject(parameterList[2].getOutputData()));
}
}
catch (Exception e)
{
//System.out.println("Program " + program.getProgram() + " issued an exception!");
e.printStackTrace();
}
// Done with the system.
system.disconnectAllServices();
The application Hangs at this lineif (program.run() != true), and I wait for about 10 minutes and then I terminate the application.
Any idea what I am doing wrong?
Edit
Here is the message on the job log:
Client request - run program QSYS/QWCRTVCA.
Client request - run program LIBNAME/FUNNAME.
File P6CASEL2 in library *LIBL not found or inline data file missing.
Error message CPF4101 appeared during OPEN.
Cannot resolve to object YOBPSSR. Type and Subtype X'0201' Authority
FUNNAME insert a row into table P6CASEPF through a view called P6CASEL2. P6CASEL2 is in a different library lets say LIBNAME2. Is there away to maybe set the JobDescription?

Are you sure FUNNAME.PGM is terminating and not hung with a MSGW? Check QSYSOPR for any messages.
Class ProgramCall:
NOTE: When the program runs within the host server job, the library list will be the initial library list specified in the job description in the user profile.

So I saw that my problem is that my library list is not setup, and for some reason, the user we are using, does not have a Job Description. So to over come this I added the following code before calling the program.run()
CommandCall command = new CommandCall(system);
command.run("ADDLIBLE LIB(LIBNAME)");
command.run("ADDLIBLE LIB(LIBNAME2)");
This simply add this LIBNAME, and LIBNAME2 to the user's library list.

Oh yes, the problem is Library list not set ... take a look at this discussion on Midrange.com, there are different work-around ...
http://archive.midrange.com/java400-l/200909/msg00032.html
...
Depe

DJ Native Swing javascript command problems

Using DJ Native Swing it is possible to show a web page within a java application. When you do this it is also possible to communicate from the browser to the java runtime environment using the "command" protocol. The documentation has a code snippet which demonstrates it's usage:
function sendCommand( command ){
var s = 'command://' + encodeURIComponent( command );
for( var i = 1; i < arguments.length; s+= '&' + encodeURIComponent( arguments[i++] ) );
window.location = s;
}
As it looks here it seems to be a regular GET request to an url using the command protocol instead of http. Although when I create and image, script tag or just and ajax get request there is no response and the breakpoint in the java runtime isn't triggered.
I don't want to set the window.location because I don't want to navigate away from the page I am currently at. Using the link to navigate to a command url does work though but it also navigates away from the current page. The page uses OpenLayers and dojo. (I have also tried dojo.io.script)

After some work I have found a neat way to communicate with the java runtime which doesn't trigger a refresh of the page every time there is communication. It is inspired on the way JSONP works to get around the cross domain restriction in most browsers these days. Because an iFrame will also trigger a command:// url it possible to do a JSONP like action using this technique. The code on the client side (browser):
dojo.provide( "nmpo.io.java" );
dojo.require( "dojo.io.script" );
nmpo.io.java = dojo.delegate( dojo.io.script, {
attach: function(/*String*/id, /*String*/url, /*Document?*/frameDocument){
// summary:
// creates a new tag pointing to the specified URL and
// adds it to the document.
// description:
// Attaches the script element to the DOM. Use this method if you
// just want to attach a script to the DOM and do not care when or
// if it loads.
var frame = dojo.create( "iframe", {
id: id,
frameborder: 0,
framespacing: 0
}, dojo.body( ) );
dojo.style( frame, { display: "none" } );
dojo.attr( frame, { src: url } );
return frame;
},
_makeScriptDeferred: function(/*Object*/args){
//summary:
// sets up a Deferred object for an IO request.
var dfd = dojo._ioSetArgs(args, this._deferredCancel, this._deferredOk, this._deferredError);
var ioArgs = dfd.ioArgs;
ioArgs.id = dojo._scopeName + "IoScript" + (this._counter++);
ioArgs.canDelete = false;
//Special setup for jsonp case
ioArgs.jsonp = args.callbackParamName || args.jsonp;
if(ioArgs.jsonp){
//Add the jsonp parameter.
ioArgs.query = ioArgs.query || "";
if(ioArgs.query.length > 0){
ioArgs.query += "&";
}
ioArgs.query += ioArgs.jsonp
+ "="
+ (args.frameDoc ? "parent." : "")
+ "nmpo.io.java.jsonp_" + ioArgs.id + "._jsonpCallback";
ioArgs.frameDoc = args.frameDoc;
//Setup the Deferred to have the jsonp callback.
ioArgs.canDelete = true;
dfd._jsonpCallback = this._jsonpCallback;
this["jsonp_" + ioArgs.id] = dfd;
}
return dfd; // dojo.Deferred
}
});
When a request is sent to the java runtime a callback argument will be supplied and a webBrowser.executeJavascript( callbackName + "(" + json + ");" ); action can be executed to trigger the callback in the browser.
Usage example client:
dojo.require( "nmpo.io.java" );
nmpo.io.java.get({
// For some reason the first paramater (the one after the '?') is never in the
// paramater array in the java runtime. As a work around we stick in a dummy.
url: "command://sum?_",
callbackParamName: "callback",
content: {
numbers: [ 1, 2, 3, 4, 5 ].join( "," )
},
load: function( result ){
console.log( "A result was returned, the sum was [ " + result.result + " ]" );
}
});
Usage example java:
webBrowser.addWebBrowserListener(new WebBrowserAdapter() {
#Override
public void commandReceived(WebBrowserCommandEvent e) {
// Check if you have the right command here, left out for the example
// Parse the paramaters into a Hashtable or something, also left out for the example
int sum = 0;
for( String number : arguments.get( "numbers" ).split( "," ) ){
sum += Integer.parseInt( number );
}
// Execute the javascript callback like would happen with a regular JSONP call.
webBrowser.executeJavascript( arguments.get( "callback" ) + "({ result: " + sum + " });" );
}
});
Also with IE in the frame I can highly recommend using firebug lite, the dev tools for IE are not available.