koobas.hobune.stream
How to get the keys of a SimpleJSON dictionary ?
Hello, I am parsing a string into SimpleJSON to get a dictionary and then I need to get all the keys of this one, is there a way, a method to get the keys ? I couldn't find anything in Google.
Thanks you for your help.
p.s : I'm writting in JavaScript.
@Kiloblargh : I couldn't wait to test it, and unfortunately I must say that it didn't worked :(
The dictionary returned by SimpleJSON is a very complicated object without "Keys()" method.
However you gave me the strength to search again, and later an idea.. Why not write a method in C# to get the keys (I've never written in C#).
I modified the SimpleJSON.cs that can be found here and added the following lines in the JSONClass (around lines 677) :
public ArrayList GetKeys() // The method is named "GetKeys()"
{
ArrayList arrayOfStrings = new ArrayList(); // declares new array
foreach (KeyValuePair<string, JSONNode> N in m_Dict) // for each key/values
arrayOfStrings.Add(N.Key); // I add only the keys
return arrayOfStrings; // And then I get them all :D
}
In javascript I get the keys :
import SimpleJSON; // Importing the SimpleJSON.cs file
var str : String = '{"0101": "TG", "0308": "C"}'; // The json string
function Start() {
var dict = JSONNode.Parse(str); // I parse the string into SimpleJSON to get the dictionary
var test = dict.GetKeys(); // I get my array of keys
for (var keys : String in test) { // and then display them through a for loop
Debug.Log(keys);
}
}
Thanks you again and have a nice day
First of all i'm glad you found a way on your own. Actually I haven't written the parser as a general purpose parser in the first place, so i'm sorry this little helper was missing ;)
Of course some day ago i was in need of the keys as well and added a "$$anonymous$$eys" property:
// C#
// in JSONNode
public virtual IEnumerable<string> $$anonymous$$eys { get { yield break; } }
// C#
// in JSONClass
public override IEnumerable<string> $$anonymous$$eys
{
get
{
foreach(var key in m_Dict.$$anonymous$$eys)
yield return key;
}
}
With those you can simply do
// C#
foreach( var key in someJsonObject.$$anonymous$$eys )
{
Debug.Log(key);
}
// UnityScript
for( var key in someJsonObject.$$anonymous$$eys )
{
Debug.Log(key);
}
Or, since it's a IEnumerable, you can convert it to a List or array with Linq. Don't forget to import / using "System.Linq" at the top:
// C#
List<string> keyList = someJsonObject.$$anonymous$$eys.ToList();
string[] keyArray = someJsonObject.$$anonymous$$eys.ToArray();
// UnityScript
var keyList = someJsonObject.$$anonymous$$eys.ToList();
var keyArray = someJsonObject.$$anonymous$$eys.ToArray();
Someday i will update my parser on the wiki, but i don't have time at the moment ;)
I am the one who's glad to receive a comment from the SimpleJSON master :) If you already think of this that great for the future.
@sdgd : I prefer not being "selfish" and let the others approve the answer if that helped them.
@sdgd : I prefer not being "selfish" and let the others approve the answer if that helped them. --@jnc1 Feb 25 at 01:34 P$$anonymous$$
Others don't accept the answer. The one that asked the question marks the accepted answer, and in this case that's you.
I also just removed "[SOLVED]" from your topic title. Simply marking an accepted answer is sufficient.
Hi,i get it ,you can do this ,
jar is the JSONNode of JSONArray
foreach (KeyValuePair kvp in jaR.AsObject) { Debug.Log(kvp.Key + "---" + kvp.Value); }
This is actually the correct answer. The only thing missing is the types used in $$anonymous$$eyValuePair.
It should be something like this:
foreach( $$anonymous$$eyValuePair<string, JSONNode> kvp in object_jNode.AsObject )
{
Debug.Log(kvp.$$anonymous$$ey + ", " + kvp.Value);
}
Right, though you can simply use "var" in this case.
foreach(var kvp in someNode)
{
Debug.Log(kvp.$$anonymous$$ey + ", " + kvp.Value);
}
SimpleJSON also comes with an implicit conversion of $$anonymous$$eyValuePair<string, JSONNode> to JSONNode. So if you iterate through an JSONArray or if you're only interested in the values of an object you can do
foreach(JSONNode n in someNode)
{
}
This assumes you used the latest version on github. The latest version uses a struct enumerator which doesn't allocate memory. Of course this enumerator has to work for arrays as well as objects. That's why it always works with $$anonymous$$eyValuePairs and why the implicit conversion exists. Though the JSONNode also has a $$anonymous$$eys and a Values enumerable (also a struct enumerator of course) to iterate through only the keys or values.
The struct enumerator doesn't work with Linq since it doesn't implement the IEnumerable interface (if it would a bug in mono would box the struct enumerator and cause memory allocations). Thats why you can use someNode.Linq if you want to do some Linq magic.
Only thing to watch out for- I think this gets you a type "`Collection`" which is almost as useless in Unity as a type "`Object`". So you have to do it like this:
var keyArray : TKey[] = yourDictionary.Keys().ToArray();
