I'm trying to read data from geojson file using this code:
NSString *jsonPath = [[NSBundle mainBundle] pathForResource:#"roads_json" ofType:#"geojson"];
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:[[NSData alloc]
initWithContentsOfFile:jsonPath]
options:0
error:nil];
NSLog(#"points:%#",json);
and the output:
points:(null)
any idea plz...
It is always best to pass an NSError object when using NSJSONSerialization. This way you can know what exactly is wrong.
NSError *error;
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:[[NSData alloc]
initWithContentsOfFile:jsonPath]
options:0
error:&error];
if (error)
{
NSLog(#"Could not serialize GeoJSON file: %#", [error localizedDescription]);
}
else
{
//GeoJSON has been successfully decoded
}
Related
I want to try to convert NSData to NSDictionary or NSArray but some how i can't do that but whenever try to convert into NSString it will converted and gating data so any one can know what is mistake ,help me below is code for convert
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data
options:0
error:nil];
Below code for convert into NSString
NSString *str = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
But Problem is that When get this type of data it will converted on array
Response:
[["superwoman",0],["sugar",0],["sultan trailer",0],["summer",0],["superman",0],["sunday candy",0],["sublime",0],["summer sixteen",0],["superfruit",0],["sultan songs",0]]
but Whenever gat this type of response it will not converted on array formated because of ,[3 on response
Response:
[["ssundee",0],["selena gomez",0],["sia",0],["sorry beyonce",0],["smosh",0],["sweatshirt jacob
sartorius",0],["skydoesminecraft",0],["secret life of pets
trailer",0,[3]]
try this one
NSError* error;
NSDictionary* json = [NSJSONSerialization JSONObjectWithData:responseObject
options:kNilOptions
error:&error];
1)You need to take the response in id type variable & check the class of response like below.
2)You also need to check if JSON convertion is successful
NSError * error;
id result = [NSJSONSerialization JSONObjectWithData:data
options:0 error:&error];
if (!error) {
if([id isKindOfClass:[NSDictionary class]]){
//Response is Dictonary
} else if ([id isKindOfClass:[NSArray class]]){
//Response is Array
} else {
//any other format
}
} else {
//Handle error
}
I am new to iOS development. I am trying to covert JSOn array values to Objective-C values. My JSON values are like this:
{"result":
[{"alternative":
[{"transcript":"4"},
{"transcript":"four"},
{"transcript":"so"},
{"transcript":"who"}],
"final":true}],
"result_index":0}
I have tried it this way:
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:speechrequestString]];
NSError *error;
NSDictionary *speechResult= [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
NSArray *speechArray= [speechResult valueForKey:#"result"];
NSLog(#"%#",speechArray);
NSLog(#"Response is of type: %#", [speechArray class]);
speechArray is always null. How to resolvee this problem?
At the same time I would like to print transcript values.
I think the problem might be in initializing the array and Dictionary.
Try doing this,
NSDictionary *speechResult = [NSDictionary new];
NSArray *speechArray = [NSArray new];
Hope it helps..
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:0 error:&error];//data is your response from server as NSData
if ([json isKindOfClass:[NSDictionary class]]){ //Added instrospection as suggested in comment.
NSArray * speechArray = json[#"result"];
}
NSLog(#"speech array %#",speechArray);
Did you check the value in NSDictionary (speechResult).
If it is nil, check the json data isValid or not.
NSError *error;
if ([NSJSONSerialization JSONObjectWithData:data
options:kNilOptions
error:&error] == nil)
{
// Check the error here
}else {
// here check whether it is a dictionary and it has key like #Bhadresh Mulsaniya mentioned.
}
If returns nil, then you check the error to understand what's wrong.
try this may be it will help you:-
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:speechrequestString]];
NSError *error;
NSDictionary *speechResult = [NSDictionary new];
speechResult= [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
NSArray *speechArray = [[NSArray alloc]init];
speechArray= [speechResult valueForKey:#"result"];
NSLog(#"%#",speechArray);
NSLog(#"Response is of type: %#", [speechArray class]);
try this code,
restaurantdictionary = [NSJSONSerialization JSONObjectWithData:mutableData options:NSJSONReadingMutableContainers error:&e];
NSMutableArray *main_array=[[NSMutableArray alloc]init];
main_array=[restaurantdictionary valueForKey:#"results"];
NSLog(#"main_array %#", main_array);
its working for me, hope its helpful
You have to initialize the array before using it,
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:speechrequestString]];
NSError *error;
NSDictionary *speechResult= [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
NSArray *speechArray= [[NSArray alloc] init];
speechArray= [speechResult valueForKey:#"result"];
if (speechArray.count>0) {
NSDictionary * alternativeDictn = [speechArray objectAtIndex:0];
NSArray *alternativeAry= [[NSArray alloc] init];
alternativeAry = [alternativeDictn objectForKey:#"alternative"];
NSLog(#"%#",alternativeAry);
}
NSLog(#"Response is of type: %#", [speechArray class]);
Using this code you will get following result,
(
{
transcript = 4;
},
{
transcript = four;
},
{
transcript = so;
},
{
transcript = who;
}
)
Try out the below code to get the transcripts:
NSData* jsonData = [yourJsonString dataUsingEncoding:NSUTF8StringEncoding];
NSError *error = nil;
NSDictionary *responseObj = [NSJSONSerialization
JSONObjectWithData:jsonData
options:0
error:&error];
if(! error) {
NSArray *responseArray = [responseObj objectForKey:#"result"];
for (NSDictionary *alternative in responseArray) {
NSArray *altArray = [alternative objectForKey:#"alternative"];
for (NSDictionary *transcript in altArray) {
NSLog(#"transcript : %#",[transcript objectForKey:#"transcript"]);
}
}
} else {
NSLog(#"Error in parsing JSON");
}
You should alloc your dictionary first like this-
NSDictionary *speechResult = [[NSDictionary alloc]init];
speechResult= [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
NSArray *speechArray = [[NSArray alloc]init];
speechArray= [speechResult valueForKey:#"result"];
I have a scenario where app reads file from server (dropbox) and checks version. If new version is available then download the app.
I'm trying to read file from link but getting null after JSON parsing.
NSError *error;
NSString *strFileContent = [NSString stringWithContentsOfURL:[NSURL URLWithString:#"https://www.dropbox.com/s/22mm417fxdqdn8c/FileStructure.txt?dl=0"]
encoding:NSUTF8StringEncoding
error:&error];
if(!error) { //Handle error
// NSLog(#"strFileContent: %#",strFileContent);
NSData *data = [strFileContent dataUsingEncoding:NSUTF8StringEncoding];
id json = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
NSLog(#"json : %#",[json description]);
}
else
NSLog(#"Error in reading!");
}
Any alternative to DropBox?
There is a way, I find it quite ugly, but still.
First issue, as mentioned by other: yourURLEtcdl=1.
Second big issue, the file is a rtf file, not a JSON object.
So, since there is a way going with RTF => NSAttributedString => NSString => "JSON" => Get your wanted value, here is what you could do:
NSError *error;
NSURL *url = [NSURL URLWithString:#"https://www.dropbox.com/s/22mm417fxdqdn8c/FileStructure.txt?dl=1"];
NSString *strFileContent = [NSString stringWithContentsOfURL:url
encoding:NSUTF8StringEncoding
error:&error];
NSLog(#"strFileContent: %#", strFileContent);
if(!error)
{
NSError *rtfError;
NSAttributedString *attributedString = [[NSAttributedString alloc] initWithData:[strFileContent dataUsingEncoding:NSUTF8StringEncoding]
options:#{NSDocumentTypeDocumentAttribute:NSRTFTextDocumentType} documentAttributes:nil
error:&rtfError];
if (rtfError)
{
NSLog(#"RTFError: %#", [rtfError localizedDescription]);
}
else
{
NSLog(#"string: %#", [attributedString string]);
NSData *data = [[attributedString string] dataUsingEncoding:NSUTF8StringEncoding];
NSError *jsonError;
NSDictionary *jsonDict = [NSJSONSerialization JSONObjectWithData:data options:0 error:&jsonError];
if (jsonError)
{
NSLog(#"JSON Error: %#", [jsonError localizedDescription]);
}
else
{
NSLog(#"JSON: %#", jsonDict);
NSInteger version = [[jsonDict objectForKey:#"Version"] integerValue];
NSLog(#"Version: %ld", (long)version);
}
}
}
else
{
NSLog(#"Error: %#", error);
}
As I said, I don't find these very great, it works, but this solution seems to me quite messy (passing twice with NSData).
That's not a text file containing JSON; it's an RTF file containing JSON. That won't work with NSJSONSerialization:
{\rtf1\ansi\ansicpg1252\cocoartf1347\cocoasubrtf570
{\fonttbl\f0\fswiss\fcharset0 Helvetica;}
{\colortbl;\red255\green255\blue255;}
\paperw11900\paperh16840\margl1440\margr1440\vieww10800\viewh8400\viewkind0
\pard\tx566\tx1133\tx1700\tx2267\tx2834\tx3401\tx3968\tx4535\tx5102\tx5669\tx6236\tx6803\pardirnatural
\f0\fs24 \cf0 \{\
"Version": 1.0,\
"ImageList": [\
"Nature.png",\
"Nature-1.png",\
"Ballon.png"\
]\
\}}
You've saved that file using an editor that uses RTF (the default Mac TextEdit ). you'll need to re-save as plain text.
Provided URL is incorrect too. If you need only file contents you have to set dl=1 (last component of url). Like so -
dropbox.com/s/22mm417fxdqdn8c/FileStructure.txt?dl=1
I am new to iOS. I have this JSON data that I needed to parse:
{
"allseries":[
{
"type":"HR",
"title":"Heart Rate",
"xLabel":"Time",
"yLabel":"Beats per Min",
"defaultUnit":"BPM",
"url":"info/info?user=admin%40korrent.com&type=HR",
"size":18,
"firstTs":1406755651,
"lastTs":1406841254
},
{
"type":"TEMP",
"title":"Temperature",
"xLabel":"Time",
"yLabel":"Temperature",
"defaultUnit":"F",
"url":"info/info?user=admin%40korrent.com&type=TEMP",
"size":6,
"firstTs":1406854147,
"lastTs":1406854283
}
],
"status":"OK"
}
So far this is my code:
NSString *dataReceived= [[NSString alloc] initWithData:_responseData encoding:NSUTF8StringEncoding];
NSLog(#"--> async response data (string): %#", dataReceived);
NSData *jsonData = [dataReceived dataUsingEncoding:NSUTF8StringEncoding];
NSError *jsonError;
NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:jsonData options:nil error:&jsonError];
NSLog(#"JSON key and value %#", [dict description]);
NSLog(#" %# ", dict[#"allseries"]);
NSString *jsonString=dict[#"allseries"];
if (_programState == 4){
NSLog(#"state is 4");
NSLog(#"%#",jsonString);
NSData *Data = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
However, the code throws invalid argument exception for this line:
NSData *Data = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
Further more, jsonString seems totally "inoperable". I cannot split it, append strings to it etc. So what's wrong?
// The following two lines are just for logging and otherwise are not needed.
NSString *dataReceived= [[NSString alloc] initWithData:_responseData encoding:NSUTF8StringEncoding];
NSLog(#"--> async response data (string): %#", dataReceived);
// Deserialize the JSON data into a dictionary
NSError *jsonError;
NSDictionary *dict = [NSJSONSerialization JSONObjectWithData: _responseData options:nil error:&jsonError];
NSLog(#"JSON key and value %#", dict);
// Get the array from the dictionary element "allseries".
NSArray *jsonArray = dict[#"allseries"];
NSLog(#"jsonArray: %#", jsonArray);
Here jsonArray is the array of dictionaries for "allseries" from the JSON
What you did is totally, totally wrong.
dict[#allseries] is not an NSString. It is an NSArray with two elements, and both its elements are NSDictionary.
I am trying to get Dictionary form json, but the following code dosent seem to work. I am getting the JSON, but cannot get the dictionary from it.
NSString *str = [[NSMutableString alloc] initWithData:responseCust encoding:NSUTF8StringEncoding];
NSLog(#"CUSTOMER string -----################ %#", str);
if(str.length>5)
{
SBJSON *jsonparser=[[SBJSON alloc]init];
NSDictionary *res= [jsonparser objectWithString:str];
NSLog(#"Contants Results %#",res);
[jsonparser release];
[str release];
}
Thank You.
Please Follow the below code
NSURL * url=[NSURL URLWithString:str];
NSData * data=[NSData dataWithContentsOfURL:url];
NSError * error;
//Get json data in Dictionary
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options: NSJSONReadingMutableContainers error: &error];
NSLog(#"%#",json);
try this one..
Use NSJSONSerialization and make use of
+ (id)JSONObjectWithData:(NSData *)data options:(NSJSONReadingOptions)opt error:(NSError **)error to convert JSON to foundation object.
hope this helps
Just try to Either
NSDictionary *dict = [str JSONValue];
NSLog(#"%#", dict);
OR
NSError *error;
NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:responseCust options:nil error:&error];
NSLog(#"%#", dict);
+(NSDictionary *)converJsonStringToDictionary:(NSString *)jsonString
{
NSString *stringToConvert = jsonString;
if (![self isObjectEmpty:stringToConvert]) {
NSData *data = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
NSError *error = nil;
NSDictionary *convertedData = nil;
convertedData = [NSJSONSerialization JSONObjectWithData:data options:0 error:&error];
if (error != nil){
DLog(#"Error converting jsonString to dictionary: %#", [error description]);
convertedData = nil;
}
else if ([convertedData isKindOfClass:[NSDictionary class]]) {
DLog(#"The converted data is of kind NSDictionary");
}
else if ([convertedData isKindOfClass:[NSArray class]]){
DLog(#"The converted data is of kind NSArray");
convertedData = nil;
}
else{
DLog(#"The converted data is not NSDictionary/NSArray");
convertedData = nil;
}
return convertedData;
}
else{
DLog(#"The received jsonString is nil")
return nil;
}
}
Here, try adding the encoding...
NSDictionary *jsonDict = [NSJSONSerialization JSONObjectWithData:[jsonString dataUsingEncoding:NSUTF8StringEncoding] options:kNilOptions error:&error];
NSLog(#"dict: %#", jsonDict);
Check here for some samples on how to handle json on objective-c