How to retrive data from json - iphone

Question

I am new to iPhone development. I got json as response.
How to separate the Drug value from the json string below:
{"arrCDrugEntity":
[
{
"DrugID":1,
"Drug":"Benadril",
"Quantity":"",
"Comment":"",
"FunctionStatus":false,
"ResultString":"",
"ErrorString":""
},
{
"DrugID":2,
"Drug":"Dcold",
"Quantity":"",
"Comment":"",
"FunctionStatus":false,
"ResultString":"",
"ErrorString":""
},
{
"DrugID":3,
"Drug":"Dolo",
"Quantity":"",
"Comment":"",
"FunctionStatus":false,
"ResultString":"",
"ErrorString":""
},
{
"DrugID":4,
"Drug":"Paracitamol",
"Quantity":"",
"Comment":"",
"FunctionStatus":false,
"ResultString":"",
"ErrorString":""
},
{
"DrugID":5,
"Drug":"Panadol",
"Quantity":"",
"Comment":"",
"FunctionStatus":false,
"ResultString":"",
"ErrorString":""
},
{
"DrugID":6,
"Drug":"Pudin Hara",
"Quantity":"",
"Comment":"",
"FunctionStatus":false,
"ResultString":"",
"ErrorString":""
}
],
"FunctionStatus":true,
"UserID":-1,
"DeliveryAddress":"",
"ResultString":"",
"ErrorString":""
}

Answer 1

Import SBJson.h in your class and use JSONValue method for converting json string into dictionary.
NSDictionary *dict = [yourJsonString JSONValue];
NSArray *arr = [dict valueForKey:#"arrCDrugEntity"];
NSMutableArray *drugArray = [[NSMutableArray alloc] init];
for (NSDictionary *drug in arr) {
[drugArray addObject:[drug valueForKey:#"Drug"]];
}
NSLog(#"drugArray:%#",drugArray);
I think it will be helpful to you.

Answer 2

NSString *str=#"http://your_web_server/your_file....";
NSURL *url=[NSURL URLWithString:str];
NSData *data=[NSData dataWithContentsOfURL:url];
NSError *error=nil;
id *response=[NSJSONSerialization JSONObjectWithData:data options:
NSJSONReadingMutableContainers error:&error];
NSLog("Your JSON Object: %# Or Error is: %#, response, error);
Following code for retrive json data
Dictionary *json = [myString JSONValue];
// Get the objects you want, e.g. output the second item's client id
NSArray *items = [json valueForKeyPath:#"arrCDrugEntity"];
NSLog(#" client Id : %#", [[items objectAtIndex:1] objectForKey:#"clientId"]);
May this help you

Answer 3

You can use NSJSONSerialization for doing this.
NSData *response = [yourJSONString dataUsingEncoding:NSUTF8StringEncoding];
NSArray *jsonArray = [NSJSONSerialization JSONObjectWithData: response options: NSJSONReadingMutableContainers error: &err];

Answer 4

First put your JSON through a JSON formatter before pasting it, easier to read, use this website
http://jsonformatter.curiousconcept.com/
Secondly, find good JSON parser, personally I use SBJSON, found here
http://stig.github.com/json-framework/
Once you have that downloaded, quite easy to parse, like this, example below
NSString *filePath = [[NSBundle mainBundle] pathForResource:#"drugData" ofType:#"json"];
NSData *myData = [NSData dataWithContentsOfFile:filePath];
NSString *responseString = [[NSString alloc] initWithData:myData encoding:NSUTF8StringEncoding];
NSDictionary *MainJSON = [responseString JSONValue];
NSArray *array = [MainJSON valueForKey:#"arrCDrugEntity"];
for(int i = 0; i < [array count]; i++)
{
NSDictionary *temp = [array objectAtIndex:i];
NSLog(#"%#", [temp valueForKey:#"Drug"]);
}
Edit: Updated loop, better way of parsing it, as means you can loop through each individual drug object, so easier if you want to parse the data into a drug object class if you need to

Answer 5

Use this code
#import "JSONKit.h"
NSDictionary *dictionary = [stringData objectFromJSONString];
NSArray *arrayOfDrugs=[NSArray alloc] initWithArray:[dictionary valueForKey:#"arrCDrugEntity"];
for (NSDictionary *drugDic in arrayOfDrugs)
{
NSLog(#"drug id is :%#",[drugDic valueForKey:#"DrugID"]);
NSLog(#"drug is :%#",[drugDic valueForKey:#"Drug"]);
NSLog(#"Quantity is :%#",[drugDic valueForKey:#"Quantity"]);
NSLog(#"Comment is :%#",[drugDic valueForKey:#"Comment"]);
NSLog(#"FunctionStatus is :%i",[[drugDic valueForKey:#"FunctionStatus"] intValue]);
NSLog(#"ResultString is :%#",[drugDic valueForKey:#"ResultString"]);
NSLog(#"ErrorString is %#",[drugDic valueForKey:#"ErrorString"]);
}
with simple JSON Files
but you have to disable ARC in build setting for JSON file.