i have this code and searched the internet and find it ok but its not working with me
NSMutableDictionary *dict = [NSMutableDictionary dictionary];
.....
NSLog(#"%#",[dict objectForKey:#"STATUS"]);
if ([[dict objectForKey:#"STATUS"] isEqualToString:#"Y"]) {
NSLog(#"Done");
}
The NSLog Shows Y Which Should Work With if statment
When you do:
[dict setObject:[arr objectAtIndex:1] ...
i think this is adding the strings to the dictionary as objects. The NSLog line is working because NSLog sends each object it is passed the "description" message to convert it to its string value. you can do the same thing.
try changing this:
if ([[dict objectForKey:#"STATUS"] isEqualToString:#"Y"])
to this:
if ([[[dict objectForKey:#"STATUS"] description] isEqualToString:#"Y"])
That would get the string value of the object returned by objectForKey: before doing the comparison.
If you think there might be a white space throwing off the compare, trim the string before comparing, like this:
if ([[[dict objectForKey:#"STATUS"] stringByTrimmingCharactersInSet:
[NSCharacterSet whitespaceAndNewlineCharacterSet]] isEqualToString:#"Y"])
Related
I'm calling an API from Go and trying to push json string data from another api call into it.
I can hand craft the calls using a payload like
payload := strings.NewReader('[{"value1":333, "value2":444}]'
and everything is happy.
I'm now trying to covert this to take the json string {"value1":333, "value2":444} as an input parameter of type string to a function, but when I try and use that as the payload, the api is responding with
expected type: JSONArray, found: JSONObject
I naively tried setting the input to the function as []string and appending the data to an array as the input, but then strings.NewReader complained that it was being fed an array.. which is was.
I'm at a loss to work out how to convert a string of json into a json array that the api will be happy with.
I tried just surrounding the string with [] but the compiler threw a fit about incorrect line termination.
Must have been doing something wrong with the string, surrounding the {} with [] let the function pass the data, but there must be a better way than this.
Any ideas, or am I making this harder than it should be?
You were on the right track with the brackets, but you actually need to append the characters to the string. For example:
str := `{"value1":333, "value2":444}`
str = "[" + str + "]"
// [{"value1":333, "value2":444}]
https://play.golang.org/p/rWHCLDCAngd
If you use brackets outside a string or rune literal, then it is parsed as Go language syntax.
I would like to parse json string using JObject.Parse() of NewtonSoft.Json. Assume that the json string is like this:
{"json":"{\"count\":\"123\"}"}
The result of jObject.First.ToString() is "json": "{\"count\":\"123\"}".
The result of jObject["json"].ToString() is {"count":"123"}. Enumerating gets the same result as this.
The testing code I used is like this.
[TestMethod()]
public void JsonParseTest()
{
var json = "{\"json\":\"{\\\"count\\\":\\\"123\\\"}\"}";
var jObject = JObject.Parse(json);
Console.WriteLine($"json : {json}");
Console.WriteLine($"jObject.First.ToString() : {jObject.First}");
Console.WriteLine($"jObject[\"json\"].ToString() : {jObject["json"]}");
}
We can see that enumerating of jObject will lose the character '\'. What is the problem? I would be appreciated for any suggestion :)
EDIT 1
The version of NewtonSoft is 12.0.3 released in 2019.11.09.
The parser isn't loosing anything. There is no literal \ in your example. The backslashes are purely part of the JSON syntax to escape the " inside the string vlue. The value of the key json is {"count":"123"}.
If you want to have backslashes in that value (however I don't see why you would want that), then you need add them, just like you added them in your C# string (C# and JSON happen to have the same escaping mechanism):
{"json":"{\\\"count\\\":\\\"123\\\"}"}
with leads to the C# code:
var json = "{\"json\":\"{\\\\\\\"count\\\\\\\":\\\\\\\"123\\\\\\\"}\"}";
Swift 3 , Xcode8.2.1,
I'm trying to extract specific values from a json file in the project. The name of the file is city.list.json, and the syntax of the json file is as follows:
{"_id":707860,"name":"Hurzuf","country":"UA","coord":{"lon":34.283333,"lat":44.549999}}
{"_id":519188,"name":"Novinki","country":"RU","coord":{"lon":37.666668,"lat":55.683334}}
The input I have is the country name and i need the id value or the country code relevant returned as a string.
I get an error:
"Type 'Any?' has no subscript members",
The method I wrote:
private func findCountryCodeBy(location: String)->String{
var result:String="";
let bundle = Bundle(for: type(of: self));
if let theURL = bundle.url(forResource: "city.list", withExtension: "json") {
do {
let data = try Data(contentsOf: theURL);
if let parsedData = try? JSONSerialization.jsonObject(with: data, options:[]) as! [String:Any] {
result = parsedData["_id"][location][0] as! String;
}
} catch {
print(error);
result = "error";
}
}
return result;
}
That is not valid JSON. I think the nearest valid JSON equivalent would be EITHER a JSON list like:
[
{"_id":707860,"name":"Hurzuf","country":"UA","coord":{"lon":34.283333,"lat":44.549999}},
{"_id":519188,"name":"Novinki","country":"RU","coord":{"lon":37.666668,"lat":55.683334}}
]
Ie, a list enclosed within square brackets with each item separated by a comma.
OR a JSON dictionary:
{
"707860": {"name":"Hurzuf","country":"UA","coord":{"lon":34.283333,"lat":44.549999}},
"519188": {"name":"Novinki","country":"RU","coord":{"lon":37.666668,"lat":55.683334}}
}
Ie, a dictionary enclosed within curly brackets with the key (in this case I've used your _id as the key) before the : and the value (a dictionary of all the other items" after the :.
(Newlines, tabs, whitespace are ignored, I've just included them to make it obvious what I've done).
I think that the dictionary version may suit your code better, but it depends on what else you want to do with the data. A list may suit some situations better.
I wrote a quick Python script to simply read JSON from a file (and not do anything else with it), and it produced a parsing error for the not-quite-JSON that you had, but it worked fine on both of my JSON examples, above.
NB: If you do NOT have control over the format of the file you are reading (ie, if you are receiving it from some other source which cannot produce it in any other format) then you will have to either modify the format of the file after you receiv it to make it valid JSON, OR you will have to use something other than JSONSerialization to read it. You could modify it by replacing all occurrences of }{ or }\n{ with },{ and then put [ at the beginning and ] at the end. That should do the job for converting this particular file to valid JSON for a list. Converting to a dictionary would be a little more involved.
Ideally though, you may have control over the file format yourself, in which case, just change whatever generates the file to produce correct JSON in the first place.
Once you have your valid JSON and parsed it into your parsedData variable, you'll then need to fix this line:
result = parsedData["_id"][location][0] as! String;
Assuming that location is the the equivalent of the _id string in the JSON, then you may be able to use the dictionary version of the JSON above and replace that line with something like:
result = parsedData[location]["country"];
However, if location is not the _id string in the JSON, then you'd be better off using the list version of the JSON above, and use a for loop to compare the values of each list item (or use a dictionary version of the JSON keyed on whatever location actually relates to in the JSON).
I'd like to add a dictionary to another dictionary in swift but I get the following error.
My aim is to mirror the structure of a nested object into a dictionary so that I am able to serialize it to JSON.
func toDictionary() -> Dictionary<String,AnyObject>{
var dic = Dictionary<String,AnyObject>()
println(From.Text)
println(From.Email)
var fromDic = ["Address":From.Email,"Text":From.Text]
println(fromDic)
dic.updateValue(fromDic, forKey: "From")
the code you show works fine for me - the error is likely not on that line xcode shows.
xcode6 often misses the correct line and the real error is some lines below
Assuming you have declarations for From, From.Email and From.Text, then it appears to work fine:
Please pardon me if this is a repeat question. I have been through some of the questions/answers with a similar requirement but somehow got a bit overwhelmed and confused at the same time. My requirement is:
I get a JSON string/object as a request parameter. ( eg: params.timesheetJSON )
I then have to parse/iterate through it.
Here is the JSON that my grails controller will be receiving:
{
"loginName":"user1",
"timesheetList":
[
{
"periodBegin":"2014/10/12",
"periodEnd":"2014/10/18",
"timesheetRows":[
{
"task":"Cleaning",
"description":"cleaning description",
"paycode":"payCode1"
},
{
"task":"painting",
"activityDescription":"painting description",
"paycode":"payCode2"
}
]
}
],
"overallStatus":"SUCCESS"
}
Questions:
How can I retrieve the whole JSON string from the request? Does request.JSON be fine here? If so, will request.JSON.timesheetJSON yield me the actual JSON that I want as a JSONObject?
What is the best way to parse through the JSON object that I got from the request? Is it grails.converters.JSON? Or is there any other easy way of parsing through? Like some API which will return the JSON as a collection of objects by automatically taking care of parsing. Or is programatically parsing through the JSON object the only way?
Like I said, please pardon me if the question is sounding vague. Any good references JSON parsing with grails might also be helpful here.
Edit: There's a change in the way I get the JSON string now. I get the JSON string as a request paramter.
String saveJSON // This holds the above JSON string.
def jsonObject = grails.converters.JSON.parse(saveJSON) // No problem here. Returns a JSONObject. I checked the class type.
def jsonArray = jsonArray.timesheetList // No problem here. Returns a JSONArray. I checked the class type.
println "*** Size of jsonArray1: " + jsonArray1.size() // Returns size 1. It seemed fine as the above JSON string had only one timesheet in timesheetList
def object1 = jsonArray[1] // This throws the JSONException, JSONArray[1] not found. I tried jsonArray.getJSONObject(1) and that throws the same exception.
Basically, I am looking to seamlessly iterate through the JSON string now.
I have wrote some code that explains how this can be done, that you can see below, but to be clear, first the answers to your questions:
Your JSON String as you wrote above will be the contents of your POST payload to the rest controller. Grails will use its data binding mechanism to bind the incomming data to a Command object that your should prepare. It has to have fields corresponding to the parameters in your JSON String (see below). After you bind your command object to your actual domain object, you can get all the data you want, by simply operating on fields and lists
The way to parse thru the JSON object is shown in my example below. The incomming request is esentially a nested map, with can be simply accessed with a dot
Now some code that illustrates how to do it.
In your controller create a method that accepts "YourCommand" object as input parameter:
def yourRestServiceMethod (YourCommand comm){
YourClass yourClass = new YourClass()
comm.bindTo(yourClass)
// do something with yourClass
// println yourClass.timeSheetList
}
The command looks like this:
class YourCommand {
String loginName
List<Map> timesheetList = []
String overallStatus
void bindTo(YourClass yourClass){
yourClass.loginName=loginName
yourClass.overallStatus=overallStatus
timesheetList.each { sheet ->
TimeSheet timeSheet = new TimeSheet()
timeSheet.periodBegin = sheet.periodBegin
timeSheet.periodEnd = sheet.periodEnd
sheet.timesheetRows.each { row ->
TimeSheetRow timeSheetRow = new TimeSheetRow()
timeSheetRow.task = row.task
timeSheetRow.description = row.description
timeSheetRow.paycode = row.paycode
timeSheet.timesheetRows.add(timeSheetRow)
}
yourClass.timeSheetList.add(timeSheet)
}
}
}
Its "bindTo" method is the key piece of logic that understands how to get parameters from the incomming request and map it to a regular object. That object is of type "YourClass" and it looks like this:
class YourClass {
String loginName
Collection<TimeSheet> timeSheetList = []
String overallStatus
}
all other classes that are part of that class:
class TimeSheet {
String periodBegin
String periodEnd
Collection<TimeSheetRow> timesheetRows = []
}
and the last one:
class TimeSheetRow {
String task
String description
String paycode
}
Hope this example is clear enough for you and answers your question
Edit: Extending the answer according to the new requirements
Looking at your new code, I see that you probably did some typos when writting that post
def jsonArray = jsonArray.timesheetList
should be:
def jsonArray = jsonObject.timesheetList
but you obviously have it properly in your code since otherwise it would not work, then the same with that line with "println":
jsonArray1.size()
shuold be:
jsonArray.size()
and the essential fix:
def object1 = jsonArray[1]
shuold be
def object1 = jsonArray[0]
your array is of size==1, the indexing starts with 0. // Can it be that easy? ;)
Then "object1" is again a JSONObject, so you can access the fields with a "." or as a map, for example like this:
object1.get('periodEnd')
I see your example contains errors, which lead you to implement more complex JSON parsing solutions.
I rewrite your sample to the working version. (At least now for Grails 3.x)
String saveJSON // This holds the above JSON string.
def jsonObject = grails.converters.JSON.parse(saveJSON)
println jsonObject.timesheetList // output timesheetList structure
println jsonObject.timesheetList[0].timesheetRows[1] // output second element of timesheetRows array: [paycode:payCode2, task:painting, activityDescription:painting description]