I want to Download and Upload, for example a .txt file, with the UA-Expert Client to/from a Server which i have set up on a Device.
Could someone provide me a Step by Step solution or an example on how to implement this?
I first followed the tutorials from the open62541 website.
I tried to follow and understand the OPC-UA-Specifications, particularly Part 5 Annex C.
Thank you in Advance.
open62541 doesn't support this out of the box meaning that there is no pre-made plugin which implements the required Objects for the various platforms.
That said it isn't to much work to do it yourself (especially if you don't need something generic/cross platform).
I've done such a one-off a few months ago. It was like 2 days of work. It was limited to downloading specific files from the server.
If my memory serves me well all you need to do is to enable the generation of the types specified by part5/annex c (there is a .txt or .csv in the sourcetree containing all the types that should be generated), after that you need to instantiate such an object (File for example) and place it somewhere in your server address space. What is left to do is to implement the various methods (open, read, ...) And to hook up your objects with callbacks to these.
This feature was added recently, but is not yet included into the official release.
Have a look at: https://github.com/opcua-tsn-team-kalycito/open62541/tree/fileType_object_implementation
(Make sure to use the commit 76eb14f6886911f954c40492cbe346c69b055ba5; the latest commit is not working)
An example implementation is:
UA_StatusCode result = UA_Server_addFile(server, FileTypeNodeId,
UA_NODEID_NUMERIC(0, UA_NS0ID_OBJECTSFOLDER),
UA_NODEID_NUMERIC(0, UA_NS0ID_ORGANIZES),
UA_QUALIFIEDNAME(1, "Sample File"),
oAttr, filePath, NULL, NULL
);
Related
I need to update a javaEE application (still in java 1.7) that provides a SOAP web service. And I'd like to disable the TIMESTAMP_CACHE that wss4j (v2.0.2) uses to control reply attacks. It creates too many files and the OS reaches the maximum open files allowed, repeatedly. The files start to appear, one for each request that has been made and are named in the following way:
wss4j%002etimestamp%002ecache-e%0058ga%0058l%0058%004b%0057g%004ah%0050w==.data
The documentation states that the TIMESTAMP_CACHE can be changed (or so I understand):
ConfigurationConstants.ENABLE_TIMESTAMP_CACHE ("enableTimestampCache"): Whether to cache Timestamp Created Strings (these are only cached in conjunction with a message Signature). The default value is "true".
I've found many examples to change some of these ConfigurationConstants when a client application creates the Call object. See an example to change the PASSWORD_TYPE constant:
Service service = new Service();
Call call = (Call) service.createCall();
...
call.setProperty(UsernameToken.PASSWORD_TYPE, WSConstants.PASSWORD_TEXT);
call.setProperty(WSHandlerConstants.USER,"werner");
However, my application is not on the client side but on the server side and I haven't found so far the way to change the ENABLE_TIMESTAMP_CACHE constant.
Any idea?
I couldn't find a way to disable the timestamp cache. However, the wss4j behaviour described above happened to be a bug that not only resulted in lots of open files but in lots of open threads. It has already been fixed in version 2.0.9. Upgrading to the "newer" version did the trick.
You can find here the discussion in full that drove to the bug discovery and here the fix in wss4j's jira
I've started investigating alternatives to my project and a few questions came out that I couldn't answer by myself.
The problem is: I want to create a web page able to access multiple Magento instances installed in the same server. Currently, I have one Magento instance per client and this project will access several Magneto instances to export reports from each one (for example).
The alternatives I thought til this moment are:
Have another Magento instance, create a new module within it that changes its 'database target' before triggering operations/queries;
Questions until this moment:
Can I 'change the database target' of a Magento instance?
How can I access data from a Magento instance without appeal to SOAP/REST?
I want to re-use some components (grids, tabs, forms..) from Magento, that's why I'm not considering an independent project (Zend, for instance) that can access this code from another projects. Does it make sense?
Any other idea?
==Edited==
Thanks by the tips and sorry by my ignorance. The comments let me believe that I'm able to execute something like this:
// File myScript.php
require '/home/DOMAIN1/app/Mage.php';
Mage::app('default');
// get some products from DOMAIN1
require '/home/DOMAIN2/app/Mage.php';
Mage::app('default');
// get some products from DOMAIN2
Is it right? Can I execute require twice (and override things from first require)?
==Edited2==
I'm still trying to connect to several Magento instances from a single third party file. Is there any tip? I'm facing several/different errors at this moment.
The only thing I know is that I can still rely on SOAP to get the information I need, but this will be expensive.
Thanks!
The easiest way would be to include Mage.php from each shop instance. You would need to use namespaces or some other trickery to be able to load more then one.
Or if that doesn't work - make your own API in a separate file to get what you want from one shop, and combine the results in the PHP-file that calls the API.
Here's a sample on how to use Magento functionality outside of Magento:
require 'app/Mage.php';
if (!Mage::isInstalled()) {
echo "Application is not installed yet, please complete install wizard first.";
exit;
}
Mage::app()->setCurrentStore(Mage_Core_Model_App::ADMIN_STORE_ID);
// your custom code here, for example, get the product model..
$productModel = Mage::getModel('catalog/product');
I'm collecting GitHub issue statistics over time on our project: total number of issues, number of issues with a particular label, number of issues in a given state (open/closed). Right now, I have a Python script to parse the project webpage with the desired labeling/state for the info I want, e.g., http://github.com/<projectname>/issues?label=<label_of_interest>&state=<state_of_interest>
However, parsing the HTML is fragile since if the GitHub API changes, more often than not, my code fails.
Does someone describe how to use the GitHub API (or barring that, know of some other way, preferably in Python) to collect these statistics without relying on the underlying HTML?
May I be so forward as to suggest that you use my wrapper around the GitHub API for this? With github3.py, you can do the following:
import github3
github = github3.login("braymp", "braymp's super secret password")
repo = github.repository("owner", "reponame")
open_issues = [i for i in repo.iter_issues()]
closed_issues = [i for i in repo.iter_issues(state='closed')]
A call to refresh may be necessary because I don't honestly recall if GitHub sends all of the issue information upon the iteration like that (e.g., replace i.refresh() for i in <generator> as the body of the list comprehensions above).
With those, you can iterate over the two lists and you will be able to use the labels attribute on each issue to figure out which labels are on an issue. If you decide to merge the two lists, you can always check the status of the issue with the is_closed method.
I suspect the actual statistics you can do yourself. :)
The documentation for github3.py can be found on ReadTheDocs and you'll be particularly interested in Issue and Repository objects.
You can also ask further questions about github3.py by adding the tag for it in your StackOverflow question.
Cheers!
I'd take a look at Octokit. Which doesn't support Python currently, but does provide a supported interface to the GitHub API for Ruby.
https://github.com/blog/1517-introducing-octokit
Although this doesn't fully meet your specifications (the "preferably Python" part), Octokit is a fantastic (and official - it's developed by GitHub) way of interacting with the GitHub API. You wrote you'd like to get Issues data. It's as easy as installing, requiring the library, and getting the data (no need for authentication if the project is public).
Install:
gem install octokit
Add this to your Ruby file to require the Octokit library:
require 'octokit'
Although there are a lot of things you can get from Octokit::Client::Issues, you may want to get a paginated list of all the issues in a repository:
Octokit.list_issues('octokit/octokit.rb')
# => [Array<Sawyer::Resource>] A list of issues for a repository.
If you're really keen on using Python, you might want to have a look at the GitHub API docs for Issues. Really, it's as easy as getting a URL like: https://api.github.com/repos/octokit/octokit.rb/issues and get the JSON data (although I'm not familiar with Python, I'm sure these some JSON parsing library); no need for authentication for public repos.
I am writing a chat program that has a bunch of clients connect to it and populate themselfs to a listview, I want to be able to click on each individual client and open up a form that looks like a chat, but I want to be able to do it to multiple clients at the same time.
I have made Form2 (the chat window) clone itself for every instance, however I need to know how to lock on to the cloned form to make changes such as Form2.RichEdit.Lines.Add
However when I try to do this it does not work because I'm not locking on to the right form since it is cloned I am assuming it is no longer Form2
Any info on this would be highly appreciated.
Update
I am going to go ahead a reword what I am trying to do.
I will explain what im trying to do: I have a chat program (server) that is listening for clients to connect via Indy10 sockets When the client connects it populates the ListView with the user name and when I click on the user name (the server) opens privatemessageform where I can chat with the client.
I want to be able to have multiple clients connected and I want to be able to click on as many as I want and have it clone the privatemessageform and have 2 separate chat windows to 2 separate clients
The problem is: When trying to click on the seccond user the program gets confused and cannot lock on to that seccond user's privatemessageform (clone).
And if any more info is needed and I mean anything at all please do not hesitate to ask I will be on for several hours and constantly checking this thread.
I've been stuck on this for 3 days so I would really love to get this resolved and move forward with my project. Any information is highly appreciated. Thanks in advance!
Open Project Options and remove Form2 from auto-creation list. Do not use that variable any more.
Rename TForm2 to some meaningful name. Once you would have ~10 forms in your program you would forget what you meant by numbers 2, 5, 7 ...
ALWAYS give variables meaningful names, that includes components, that includes forms. Here i will name TForm2 a TPrivMessageForm
Use a special array of variables to keep several forms, not a single global variable. For example like that:
Type TChatUser = string;
// to begin with, user is a name. Then it may become URL, or GUID or something
// complex like `record` or `class` or whatever
Type TPMForms = TDictionary<TChatUser, TPrivMessageForm>;
PMForms := TPMForms.Create;
Creating new private message window after clicked on user:
if not PMForms.ContainsKey(ClickedUser)
then PMForms.Add(ClickedUser, TPrivMessageForm.Create(Application) );
PMForms[ClickedUser].ChatWith := ClickedUser; // variable in ex-TForm2 to tell several instances apart
When such form is closed - it should via its OnClose
Remove itself from PMForms list (so no dangling pointers would remain)
chose caRelease for closing actions (making VCL actually free the form object)
See Also
http://delphi.about.com/od/beginners/a/using-t-dictionary-hash-tables-in-delphi.htm
http://docwiki.embarcadero.com/CodeExamples/XE4/en/Generics_Collections_TDictionary_(Delphi)
PS. Edit your question please and add TAG with your specific Delphi version.
PPS. download ready-made FLOSS chat programs and just read and learn how they do it. Maybe instead of opening a free-floating (cluttering desktop) form you'd better open Tab in PageControl. "Use the Source, Luke"
https://sourceforge.net/p/dreamchat/wiki/Home/
https://sourceforge.net/p/achat/wiki/Home/
http://www.visualirc.net/features.php
For the latter to find the sources one has to type two words "Visual IRC" at www.google.com and get http://sourceforge.net/p/visualirc/mercurial/ci/default/tree/ - this crucial information i did omitted in fair belief that a person interested in finding sources would be able to do it on his own.
PPPS. Those is not "cloned": cloned are separated objects. What you talk is several instances of the same form class. Like you may have two or more labels on the form, you can have two or more forms in your application.
In android we have the R class that stands for Resources, where we have references to all of our resources and we can easily access them in the code. Is there an equivalent in iOS? I have this doubt because, I want to be able to define multiple files with different values, for instance:
DefaultValuesForViewController1
DefaultValuesForViewController2
Besides creating plist, is there another way (faster and easier like R)?
There is no R class equivalent access method.
In Android, the R class represents access to resources that are consolidated into a native format. iPhone does not do this. Instead, resource files are just copied as is into the application bundle and must be found & opened as such.
You could create a class to store all of your data for the app. iOS generally likes the app to run lean and mean, so only storing your objects for as long as you need them, releasing them as soon as you are done with them. If you were to store everything globally, it would add some overhead, but assuming you don't have a ton of information, it shouldn't be an issue.
There is no equivalent for this in iOS apps. All you get is files that you can enumerate using standard file I/O.
However, you can emulate it partially. Here's a simple demo on GitHub
You can find that SwiftGen(e.g. Tuist used it) can be used as an alternative for autogenerated R.java file on Android
Two point
it is third party source
you have to manually run script after changing your resources