How to use the JSON Parsing? - iphone

Question

I am a fresher. I don't know how to use JSON for Parsing .I am really very confuse because the tutorial i have read are out dated because apple has deprecated all the API's and documents .Thats what i found .So anyone can give me the start to play with JSON?

Answer 1

You can use SBJSON
You can find code at GITHUB

Answer 2

Here's some links on "Picking the best JSON library":
Comparison of JSON Parser for Objective-C (JSON Framework, YAJL, TouchJSON, etc)
Best JSON library to use when developing an iPhone application?
And now for the shameless plug for my own JSON parsing solution, JSONKit:
What's the most efficient way of converting a 10 MB JSON response into an NSDictionary?
Cocoa JSON parsing libraries, part 2

Answer 3

You need to use third-party code to parse JSON. Three popular libraries/frameworks are:
SBJSON, aka json-framework
TouchJSON
yajl-objc
Choose one of them, download its source code and add it do your project.

Answer 4

You can use your custom framwork for it just as below
#import <Foundation/Foundation.h>
#import "SVProgressHUD.h"
#protocol JsonDataDelegate <NSObject>
#required
- (void) JsonprocessSuccessful: (NSString *)receivedData;
-(void) JsonprocessFail;
#end
#interface JsonRest : NSObject
{
id <JsonDataDelegate> delegate;
NSURLConnection *theConnection;
NSMutableData *webData;
BOOL HadGotResponse;
BOOL HasFailedConnection;
UIAlertView *alert;
}
#property (retain) id delegate;
#property(nonatomic,retain) NSURLConnection *theConnection;
#property (nonatomic)BOOL HadGotResponse;
#property (nonatomic)BOOL HasFailedConnection;
-(void)GetServiceCall:(NSString *)url Paraqmeter:(NSString*)parameter;
-(void)Set2Defaults;
#end
#import "JsonRest.h"
#define BASE_URL #"http://www.abc.com"
#define DOMAIN #"GETLIST"
#implementation JsonRest
#synthesize delegate,HadGotResponse,HasFailedConnection,theConnection;
- (id)init
{
if (self)
{
// Initialization code.
//appdel = (ReachCastAppDelegate*)[[UIApplication sharedApplication]delegate];
}
return self;
}
-(void)GetServiceCall:(NSString *)url Paraqmeter:(NSString*)parameter
{
[SVProgressHUD startActivity : #"Loading..."];
NSString *strUrl=[NSString stringWithFormat:#"%#%#?%#",BASE_URL,url,parameter];
NSURL *url1=[NSURL URLWithString:strUrl];
NSLog(#"domainURL :: %#",strUrl);
NSMutableURLRequest *req = [NSMutableURLRequest requestWithURL:url1];
[req setTimeoutInterval:60.0];
[req setHTTPMethod:#"GET"];
// if([HttpMethod isEqualToString:#"GET"])
// {
// [req setHTTPMethod:HttpMethod];
//
// }
// else if([HttpMethod isEqualToString:#"PUT"])
// {
// NSData *requestData = [NSData dataWithBytes: [BodyString UTF8String] length: [BodyString length]];
//
// [req setValue:valueforput forHTTPHeaderField:#"Content-type"];
// [req setHTTPMethod:HttpMethod];
// [req setHTTPBody: requestData];
//
// }
// else if ([HttpMethod isEqualToString:#"POST"]){
//
// NSData *requestData = [NSData dataWithBytes: [BodyString UTF8String] length: [BodyString length]];
//
// [req setValue:valueforput forHTTPHeaderField:#"Content-type"];
// [req setHTTPMethod:HttpMethod];
// [req setHTTPBody: requestData];
//
// }
if(theConnection)
[self Set2Defaults];
theConnection=[[NSURLConnection alloc]initWithRequest:req delegate:self];
if(theConnection)
webData=[[NSMutableData data]retain];
else
NSLog(#"Connection Failed !!!");
NSLog(#"Has got response");
}
-(void)Set2Defaults {
if (webData != nil){
[webData release];
webData = nil;
}
if (theConnection != nil) {
[theConnection release];
if (theConnection != nil)
theConnection = nil;
}
}
#pragma mark -
#pragma mark NSURL Connection Delegate methods
-(void) connection:(NSURLConnection *) connection didReceiveResponse:(NSURLResponse *) respons{
[webData setLength: 0];
NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *)respons;
int statusCode = [httpResponse statusCode];
NSLog(#"statusCode ---- >> %d",statusCode);
if (200 != statusCode) {
// if (401 == statusCode) {
}
}
-(void) connection:(NSURLConnection *) connection didReceiveData:(NSData *) data {
[webData appendData:data];
}
-(void) connection:(NSURLConnection *) connection didFailWithError:(NSError *) error {
[SVProgressHUD stopActivity];
[self Set2Defaults];
self.HadGotResponse=NO;
self.HasFailedConnection=YES;
// txtWindSpeed.text = #"";
[[self delegate] JsonprocessFail];
NSLog(#"Connection Failed!!!");
//[self HideLoadingDialogue];
alert = [[[UIAlertView alloc] initWithTitle:#"ERROR" message:#"Internet Connection Failed.Please try again." delegate:self cancelButtonTitle:nil otherButtonTitles:nil] autorelease];
//alert.frame=CGRectMake(alert.frame.origin.x, alert.frame.origin.y, alert.frame.size.width, 130);
NSLog(#"%F",alert.frame.origin.y);
[alert show];
alert.frame=CGRectMake(alert.frame.origin.x, alert.frame.origin.y+25, alert.frame.size.width, 130);
//[noConnect release];
[NSTimer scheduledTimerWithTimeInterval:2 target:self selector:#selector(timerCall) userInfo:nil repeats:NO];
}
-(void)timerCall
{
[alert dismissWithClickedButtonIndex:0 animated:TRUE];
}
-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
[SVProgressHUD stopActivity];
self.HasFailedConnection=NO;
NSString *theXML;
theXML = [[NSString alloc] initWithBytes: [webData mutableBytes] length:[webData length] encoding:NSASCIIStringEncoding];
//NSLog(#"theXML Values : %#", theXML);
//self.ResponseDict = [theXML JSONValue];
[[self delegate] JsonprocessSuccessful:theXML];
[theXML release];
}
-(void)dealloc
{
if (webData != nil){
[webData release];
webData = nil;
}
if (theConnection != nil) {
[theConnection release];
if (theConnection != nil)
theConnection = nil;
}
[super dealloc];
// [ResponseDict release];
}
#end
You can use this using below
-(void)getJsonCalling
{
#try {
NSString *strParameter=[NSString stringWithFormat:#"param1=%#&param2=%#",param1,param2];
objJsonRest=[[JsonRest alloc]init];
[objJsonRest setDelegate:self];
[objJsonRest GetServiceCall:DOMAIN Paraqmeter:strParameter];
[objJsonRest release];
}
#catch (NSException *exception) {
NSLog(#"Exception in %s %#",__FUNCTION__,exception);
}
}
- (void) JsonprocessSuccessful: (NSString *)receivedData
{
}
-(void) JsonprocessFail;
{
NSLog(#"FAIL");
}