I am trying parse the google api so that I can retrieve the address and its data.
I get two errors that are on the commented lines. Why am I getting these errors.
I allocated the dit so I should have to release it correct.
Here is my code to retrieve the data
NSURL *url=[NSURL URLWithString:str];
NSData *data=[[NSData alloc]initWithContentsOfURL:url];
NSString *str1=[[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding]autorelease];
NSDictionary *dit=[[[NSDictionary alloc]init]autorelease];//value stored to dit during initialization is never read
dit=[str1 JSONValue];
NSArray *dit1=(NSArray *) [dit objectForKey:#"results"];
NSDictionary *dit3=[[dit1 objectAtIndex:0]objectForKey:#"geometry"];
NSDictionary *dit4=[dit3 objectForKey:#"bounds"];
NSDictionary *northeast=[dit4 objectForKey:#"northeast"];
NSDictionary *lt=[northeast objectForKey:#"lat"];
NSDictionary *southwest=[dit4 objectForKey:#"southwest"];
NSDictionary *lng=[southwest objectForKey:#"lng"];
Probably the issue is this:
NSDictionary *dit=[[[NSDictionary alloc]init]autorelease];
dit=[str1 JSONValue];
You create an empty dictionary, then never use it but instead overwrite the value with the one returned from JSONValue. This code should be:
NSDictionary *dit=[str1 JSONValue];
Related
I have an application in which I am having a json response like this.
{"success":"true","message":"You have logged in","pserial":"1"} and I am separating with ":".
And I am getting data like this pSerial:"1"} but I want only 1 value.
NSURL *url = [NSURL URLWithString:strUrl];
NSData *respData = [NSData dataWithContentsOfURL:url];
NSString *strResp = [[NSString alloc]initWithData:respData encoding:NSUTF8StringEncoding];
NSString *approvalString = [[strResp componentsSeparatedByString:#":"] objectAtIndex:3];
NSLog(#"pSerial:%#",approvalString);
for Example :
SBJsonParser *jsonPar = [[SBJsonParser alloc] init];
NSError *error = nil;
NSArray *jsonObj = [jsonPar objectWithString:jsonString error:&error];
id jsonObj = [jsonPar objectWithString:jsonString error:&error];
if ([jsonObj isKindOfClass:[NSDictionary class]])
// treat as a dictionary, or reassign to a dictionary ivar
else if ([jsonObj isKindOfClass:[NSArray class]])
// treat as an array or reassign to an array ivar.
Then get the value :
NSMutableArrary *userMutArr = [NSMutableArray array];
for (NSDictionary *dict in jsonObj)
{
User *userObj = [[[User alloc] init] autorelease];
[userObj setFirstName:[dict objectForKey:#"firstName"]];
[userObj setLastName:[dict objectForKey:#"lastName"]];
[userObj setAge:[[dict objectForKey:#"age"] intValue]];
[userObj setAddress:[dict objectForKey:#"address"]];
[userObj setPhoneNumbers:[dict objectForKey:#"phoneNumber"]];
[userMutArr addObject:userObj];
}
Hope you will understand. and read some Documents. it will help you.
It looks like you are in need of JSON Parsing. Here, what you want is JSON Parsing, not separating data from the JSON Response. JSON is the format of the data in which data is formatted in Key-Value pairs. You can fetch the "Value" of any object using the "Key".
Your first two lines are correct.
NSURL *url = [NSURL URLWithString:strUrl];
NSData *respData = [NSData dataWithContentsOfURL:url];
Now, you can parse JSON Response like this :
NSError* error;
NSDictionary* json = [NSJSONSerialization JSONObjectWithData:respData options:kNilOptions error:&error];
NSString *pSerial = [json objectForKey:#"pserial"];
This will give you the value of "pserial" from your response. Similarly, you can get the values for "success" and "message". You can check it using this line :
NSLog(#"pserial :: %#",pserial);
You need to parse the JSON Response String, you can use any JSON parser like:
https://github.com/stig/json-framework/
And in your code do:
NSString *strResp = [[NSString alloc]initWithData:respData encoding:NSUTF8StringEncoding];
NSDictionary *ResponseDictionary = [strResp JSONValue];
NSString * pSerial = (NSString*)[ResponseDictionary objectForKey:#"pserial"];
Dont separation by ":" just use JSONValue your response is like
// {"success":"true","message":"You have logged in","pserial":"1"}
// with SBJsonParser parse your object like this
NSDictionary *responseJson = [YOUR-OBJECT JSONValue];
Note: dont forget to add Json header file
Its better you use any OpenSource Json Parser
Here is a stack post Comparison of different Json Parser for iOS
I need to send an NSArray to the server in the JSON array format. How can I convert it to JSON. This is a sample of my NSArray that I have to pass.
array([0] => array('latitude'=>'10.010490',
'longitude'=>'76.360779',
'altitude'=>'30.833334',
'timestamp'=>'11:17:23',
'speed'=>'0.00',
'distance'=>'0.00');
[1] => array('latitude'=>'10.010688',
'longitude'=>'76.361378',
'altitude'=>'28.546305',
'timestamp'=>'11:19:26',
'speed'=>'1.614',
'distance'=>'198.525711')
)`
and the required format is like this
[
{ "latitude":"10.010490",
"longitude":"76.360779",
"altitude":"30.833334",
"timestamp":"11:17:23",
"speed":"0.00",
"distance":"0.00"
},
{
"latitude":"10.010688",
"longitude":"76.361378",
"altitude":"28.546305",
"timestamp":"11:19:26",
"speed":"1.614",
"distance":"198.525711"
}
]
Any one have solution? Thanks in advance.
NSDictionary *firstJsonDictionary = [NSDictionary dictionaryWithObjectsAndKeys:
#"10.010490", #"latitude",
#"76.360779", #"longitude",
#"30.833334", #"altitude",
#"11:17:23", #"timestamp",
#"0.00", #"speed",
#"0.00", #"distance",
nil];
NSDictionary *secondJsonDictionary = [NSDictionary dictionaryWithObjectsAndKeys:
#"10.010490", #"latitude",
#"76.360779", #"longitude",
#"30.833334", #"altitude",
#"11:17:23", #"timestamp",
#"0.00", #"speed",
#"0.00", #"distance",
nil];
NSMutableArray * arr = [[NSMutableArray alloc] init];
[arr addObject:firstJsonDictionary];
[arr addObject:secondJsonDictionary];
NSData *jsonData2 = [NSJSONSerialization dataWithJSONObject:arr options:NSJSONWritingPrettyPrinted error:&error];
NSString *jsonString = [[NSString alloc] initWithData:jsonData2 encoding:NSUTF8StringEncoding];
NSLog(#"jsonData as string:\n%#", jsonString);
The simplest and best approach !!!
To convert NSArray or NSMutableArray into jsonString you can first convert it into NSData and then further convert that into a NSString. Use this code
NSData* data = [ NSJSONSerialization dataWithJSONObject:yourArray options:NSJSONWritingPrettyPrinted error:nil ];
NSString *jsonString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
It helped me and hope it helps you as well. All the best.
I would recommend the SBJson-Framework.
Converting an NSMutableArray is as simple as NSString *jsonString = [yourArray JSONRepresentation];
Edit: Jack Farnandish is right u have to transform it into a NSDictionary before you can convert it to Json. In my example the NSMutableArray has to contain the Dictionary. The Array is only needed to create the square brackets at the beginning and the end of the string.
You can use the build in JSON functions of iOS or use an external lib e.g. JSONKit to convert your data to JSON
First You must change you structure into NSDictionary class and NSArray containing NSDictionary objects, then try JSONKit in iOS 5 serialization works better than standard NSJSONSerialization.
#import <JSONKit/JSON.h>
NSArray *array = // Your array here.
NSString *json = [array JSONString];
NSLog(#"%#", json);
JSONKit performs significantly better than SBJson and others in my own and the author's benchmarks.
Check this tutorial, JSON in iOS 5.0 was clearly explained (serailization, deserailization).
Is the service you are calling a RESTful service?
If so, I'd strongly recommend using RestKit. It does object serialization/deserialization. It also handles all the networking underpinnings. Extremely valuable, and well maintained.
i have a problem parsing my json data for my iPhone app, I am new to objective-C. I need to parse the json and get the values to proceed. Please help. This is my JSON data:
[{"projId":"5","projName":"AdtvWorld","projImg":"AdtvWorld.png","newFeedCount":"0"},{"projId":"1","projName":"Colabus","projImg":"Colabus.png","newFeedCount":"0"},{"projId":"38","projName":"Colabus Android","projImg":"ColabusIcon.jpg","newFeedCount":"0"},{"projId":"25","projName":"Colabus Internal Development","projImg":"icon.png","newFeedCount":"0"},{"projId":"26","projName":"Email Reply Test","projImg":"","newFeedCount":"0"},{"projId":"7","projName":"PLUS","projImg":"7plusSW.png","newFeedCount":"0"},{"projId":"8","projName":"Stridus Gmail Project","projImg":"scr4.png","newFeedCount":"0"}]
On iOS 5 or later you can use NSJSONSerialization. If you have your JSON data in a string you can do:
NSError *e = nil;
NSData *data = [stringData dataUsingEncoding:NSUTF8StringEncoding];
NSArray *jsonArray = [NSJSONSerialization JSONObjectWithData: data options: NSJSONReadingMutableContainers error: &e];
Edit To get a specific value:
NSDictionary *firstObject = [jsonArray objectAtIndex:0];
NSString *projectName = [firstObject objectForKey:#"projName"];
I would recommend using JSONKit library for parsing.
Here's a tutorial on how to use it.
You will basically end up with a dictionary and use objectForKey with your key to retrive the values.
JSONKit
or
NSJSONSerialization(iOS 5.0 or later)
I have had success using SBJson for reading and writing json.
Take a look at the documentation here and get an idea of how to use it.
Essentially, for parsing, you just give the string to the SBJsonParser and it returns a dictionary with an objectForKey function. For example, your code might look something like:
NSDictionary* parsed = [[[SBJsonParser alloc] init] objectWithString: json];
NSString* projId = [parsed objectForKey:#"projId"];
Use SBJson
SBJsonParser *parser = [[SBJsonParser alloc] init];
NSMutableDictionary *dicRes = [parser objectWithString:stringFromServer error:nil];
No need to use third party classes. Objective-c already includes handling JSON.
The class NSJSONSerialization expects an NSData object or reads from a URL. The following was tested with your JSON string:
NSString *json; // contains your example with escaped quotes
NSData *jsonData = [json dataUsingEncoding:NSUTF8StringEncoding];
NSError *error;
NSArray *jsonArray = [NSJSONSerialization JSONObjectWithData:jsonData
options:NSJSONReadingAllowFragments error:&error]
For more options with NSJSONSerialization see the documentation.
I have an IPhone application in which i am using this code .
NSPropertyListFormat plistFormat;
NSDictionary *payloadDict = [NSPropertyListSerialization
propertyListWithData:subscriptionProduct.receipt
options:NSPropertyListImmutable
format:&plistFormat
error:nil];
where i am getting the subscriptionProduct.receipt correctly and reciept is an nsdata, which is declared inside the subscriptionProduct class.But after the conversion when i am trying to print payloadDict it is terned to be null.can anybody help me
Try getting the error out of the method and displaying it:
NSPropertyListFormat plistFormat;
NSError *parseError;
NSDictionary *payloadDict = [NSPropertyListSerialization
propertyListWithData:subscriptionProduct.receipt
options:NSPropertyListImmutable
format:&plistFormat
error:&parseError];
NSLog(#"payloadDict = %#", payloadDict);
NSLog(#"parseError = %#", parseError);
If parseError is nil, the property list serialization thinks it read the data properly. If not, its contents should tell you where to look.
Your comments seem to say that you want to construct a new NSDictionary that stores the object subscriptionProduct.receipt.
You can do this:
NSMutableDictionary *payloadDict = [NSMutableDictionary dictionary];
// Always check if values are nil before adding them to a dictionary.
if (subscriptionProduct.receipt)
[payloadDict setObject:subscriptionProduct.receipt forKey:#"receipt"];
If you want to load the receipt later, you can do this:
NSData *receiptData = [payloadDict objectForKey:#"receipt"];
I'm trying to convert a NSDictionary to XML. (I was successful in transforming NSDictionary to JSON). But now I need to transform NSDictionary to XML. Is there a built-in serializer in Objective-C like the one for JSON?
int r = arc4random() % 999999999;
//simulate my NSDictionary (to be turned into xml)
NSString *name = [NSString stringWithFormat:#"Posted using iPhone_%d", r];
NSString *stock_no = [NSString stringWithFormat:#"2342_%d", r];
NSString *retail_price = #"12345";
NSArray *keys = [NSArray arrayWithObjects:#"name", #"stock_no", #"retail_price", nil];
NSArray *objects = [NSArray arrayWithObjects:name,stock_no,retail_price, nil];
NSDictionary *theRequestDictionary = [NSDictionary dictionaryWithObjects:objects forKeys:keys];
NSDictionary *theFinalRequestDictionary = [NSDictionary dictionaryWithObject:theRequestDictionary forKey:#"product"];
...//other irrelevant code omitted
NSData *theBodyData = [NSPropertyListSerialization dataFromPropertyList:theFinalRequestDictionary format:NSPropertyListXMLFormat_v1_0 errorDescription:nil];
NSPropertyListFormat format;
id XMLed = [NSPropertyListSerialization propertyListFromData:theBodyData
mutabilityOption:NSPropertyListImmutable
format:&format
errorDescription:nil];
NSLog(#"the XMLed is this: %#", [NSString stringWithFormat:#"%#", XMLed]);
The NSLog doesn't print a string in XML format. It prints it like a NSDictionary.
What should I use to serialize my NSDictionary to XML?
propertyListFromData:... returns a "property list object", that is, depending on the contents of the data, an array or a dictionary. The thing that you're actually interested in (the xml) is returned by dataFromPropertyList:... and thus stored in your theBodyData variable.
Try this:
NSLog(#"XML: %#", [[[NSString alloc] initWithData:theBodyData encoding:NSUTF8StringEncoding] autorelease]);
There are many different varieties of XML. If you're not picky about the specific tags, and if the contents of your dictionary is limited to types used in property lists (NSString, NSNumber, NSDate, etc.) you can write your dictionary to a property list in one line:
[myDict writeToFile:somePath atomically:YES];
If you'd prefer to keep the XML in memory instead of writing to a file, use NSPropertyListSerialization as you're doing.