I have been reading that there is a now library in ios 5 that allows you to serialize & deserialize JSON data. I can't for the life of me find examples or the framework in my /Developer folder. Anyone have luck locating/working with this? If so could you please point me in the right direction?
NSJSONSerialization is now public in iOS 5, and there's an example of its use in the Tweeting sample app.
I'm using it and it's quite simple, just import the library:
#import <Foundation/NSJSONSerialization.h>
and begin to use it.
Here there's a small but good tutorial: http://pragprog.com/magazines/2011-11/inside-ios-
It is actually part of the Foundation framework, been trying to use it since last night and for the purpose of actually serializing a dictionary to a JSON representation it works quite fine. Sadly I've not tested it the other way around.
Trust me the doc is there and it is no private API, sadly as you observed there are no examples.
I stumbled across iOS5 JSON support in this tutorial, which is part of an excellent series of iOS5 tutorials.
Now iOS5 itself has the ability to serialize and de-serialize the json objects, it will manage all the process behind the scene, and you will be getting easily customizable foundation objects (NSArray,NSDictionary,NSString...) Based on your flavor you represented. As brainjam suggest This is the good tutorial to begin with. Hope your fingers can play around with json objects easily.
Using following simple code you can convert web data into JSON .
In this code "webData" is the data you get when you hit web service.
NSError *jsonParsingError = nil;
NSArray *result=[NSJSONSerialization JSONObjectWithData:webData options:0 error:&jsonParsingError];
Related
We are trying to decode a large json string (~200MB) from web api, the dart:convert json decode performance are really bad. We have using compute so it wont affect the UI but the long loading time are blocking the users.
Any other better json decode library in dart?
You can check out this article from Andrea : https://codewithandrea.com/articles/parse-large-json-dart-isolates/
By using compute() we can move our parsing code to the worker isolate and get all the performance benefits we want.
I am a beginner in dart/flutter programming and I could use some help with using the json_serializable plugin:
I´ve set everything up according to this tutorial: https://flutter.io/json/
but the one thing that is never mentioned is how to load the .json file into a JSON string for the .decode method in the end.
I´ve seen a lot of people using an async function to load it, but I can´t get it to work and another question I have is how does the json_serializable load it? According to my research (https://pub.dartlang.org/packages/json_serializable) it produces a Dart field with the contents of a file containing JSON. Is it possible to also use this in the .decode method?
Would be great if someone could give me answers to my questions.
As Horst Keller mentioned in his ABAP and JSON post, "with Releases 7.02 and 7.03/7.31 (Kernelpatch 116) JSON is supported natively in ABAP".
Appartently 7.02 in my case of too generic because the line below:
writer = cl_sxml_string_writer=>create( type = if_sxml=>co_xt_json ).
returns the error: "The field CO_XT_JSON is unknown, but there is a field with the similar name CO_XT_XOP".
So is there any way to easily generate JSON?
Edit: Screenshot from SAP - Status
About the class CL_TREX_JSON_SERIALIZER: I also used this class during developping a mobile sap application and I found the created JSON not being valid, thus I started googling and found this http://scn.sap.com/community/mobile/blog/2012/09/24/serialize-abap-data-into-json-format (which also explains how to create a valid JSON serializer).
Validate your json with json lint http://jsonlint.com/ to see if it is valid.. otherwise, thats for sure, you get a lot of trouble in debugging why it doenst work and dont get the point that the serializer is corrupt. regards, zY
take a look at the ZCL_MDP_JSON Library. You can parse/encode any JSON. So, it is best suited for JSON scenarios that requires flexibility.
It is easy to understand if you have used JSON in other languages. You only need to study methods of ZCL_MDP_JSON_NODE class once & look at the examples.
Here is an extended overview of the library:
http://scn.sap.com/community/abap/blog/2016/07/03/an-open-source-abap-json-library--zclmdpjson
GitHub repo with examples directory: https://github.com/fatihpense/zcl_mdp_json
Disclaimer: I'm the author of the project. If you have questions, don't hesitate to contact me.
Here is some code I wrote for ABAP data <-> JSON conversion some time ago before the new capabilities were included with ABAP (or maybe it was just an older system).
https://gist.github.com/mydoghasworms/2291540
Include the code in your ABAP source and use the method data_to_json of the class.
A nice overview of custom ABAP <-> JSON serializers including yet another one can be found in this blog post
Most popular from my point of view is SE38's ZJSON-library which can be installed using SAPLINK (and which - in contrast to many others) has an explicit license attached to it: Apache 2.0
If upgrading to a newer patch isn't an option in the short term, you can also use class CL_TREX_JSON_SERIALIZER to serialise objects to JSON. A little bit of a quick-and-dirty solution but it works well.
I'm trying to parse some JSON data, and I'm using the examples from this site: http://answers.oreilly.com/topic/257-how-to-parse-json-in-java
I'm using the data from section 2 and the code from section 3, and json-lib as my JSON library.
But when I tried to run the sample, the JSONSerializer class about a missing a language class from Apache Commons. I downloaded that, and it complained of a missing logging class. I downloaded that, and it complained of the missing EZmorph class. I downloaded that, and it complained of a missing Collections class. I then downloaded an unofficial JAR file with all the Apache Commons components, and it complained of a missing SLF4J logger or something. At least point, I gave up and decided to try Google's GSON instead.
This seems much more complicated than it should be. Just how many packages do I need do download? Is there a way to disable logging? Or am I doing something wrong?
I would recommend using another, more commonly used Java JSON library: for example Jackson or GSON. There are lots of tutorials and articles on using both, and I don't think there are many reasons to use json-lib over either one.
You can also have a look at Genson.
It is a all in one library, with nice features, easy to use and with good performances.
For example to serialize a full pojo to json and then deserialize it back :
Genson genson = new Genson();
String json = genson.serialize(yourPojo);
// and deserialize it
YourPojo pojo = genson.deserialize(json, YourPojo.class);
As Staxman says, there is no reason to use json-lib. I am still surprised of how many people are using it when there a couple of better libraries.
I would like to ask if someone know how to grab a facebook event json message. It doesnt matter if it has to happen programatically. I just want to be able to read the message one way or another.
thanks in advance.
P.s. Maybe an awful question but here you go !!!
I once had to code a small chunk of code to parse a json-encapsulated message. However recently I found out there's a handy solution for it if you use Java
Resty is a small, convenient library
to talk to RESTful services from Java.
It’s surprisingly complex to do the
simplest HTTP calls with the standard
Java library. Resty hopes to change
that.
http://beders.github.com/Resty/Resty/Overview.html
Resty r = new Resty();
Object name = r.json("http://ws.geonames.org
/postalCodeLookupJSON?postalcode=66780&country=DE")
.get("postalcodes[0].placeName");
Just import a small jar lib and you'll be surprised. I currently use this class for getting info from url API.