Json Parsing Example

Steps

first Add "ASSIHTTP" and "JSON" to your project

add all this framework to your project

in your .h file import and set delegate 

#import "HttpWrapper.h"  //import class then add delegete of this
@interface ViewController : UIViewController<HttpWrapperDelegate>
{
}@end

in your .m file call the webservice

-(void)loadWebseviceData

{

 HttpWrapper *httpWrapper=[[HttpWrapper alloc]initWithDelegate:self]; // create object of class with deleget method
    NSMutableDictionary *dicPass=[[NSMutableDictionary alloc]init]; // create a dictionary for a send parameter
    [dicPass setValue:@"Appointments" forKey:@"action"];   //pass action to webseriver
    [dicPass setValue:appDelegate.userId forKey:@"id"];   // pass parameter
    [httpWrapper requestWithMethod:@"POST" url:WEB_URL param:dicPass selSuc:@selector(fetchDataSuccessForClient:) selFail:@selector(fetchDataFail:)];   // fetch data 

}

// if fetch data sucess then call this

-(void)fetchDataSuccessForClient:(NSMutableDictionary *)response
{

 NSLog(@"%@",response);

}


// if fetch data fail then then call this
-(void)fetchDataFail:(NSError *)error
{

}

HttpWrapper.h

@class ASIFormDataRequest;

@protocol HttpWrapperDelegate

@optional

- (void) fetchDataSuccess:(NSString *)response;

- (void) fetchDataFail:(NSError *)error;

- (void) fetchImageSuccess:(NSString *)response;

- (void) fetchImageFail:(NSError *)error;

@end

@interface HttpWrapper : NSObject {

    

   NSObject<HttpWrapperDelegate> *delegate;

        

    SEL fetchSuccess;

SEL fetchFail;

}

@property SEL fetchSuccess;

@property SEL fetchFail;

@property (nonatomic, assign) NSObject<HttpWrapperDelegate> *delegate;

-(id)initWithDelegate:(id)del;

-(void) requestWithMethod:(NSString*)method url:(NSString*)strUrl param:(NSMutableDictionary*)dictParam selSuc:(SEL)forSuc selFail:(SEL)forFail;

@end

HttpWrapper.m

#import "HttpWrapper.h"

#import "ASIFormDataRequest.h"

#import "NSObject+SBJSON.h"

#import "SBJSON.h"

@implementation HttpWrapper

@synthesize delegate, fetchSuccess, fetchFail;

-(id)initWithDelegate:(id)del {

    self = [super init];

    if(self) {

        delegate = del;

    }

    return self;

}

-(void) requestWithMethod:(NSString*)method url:(NSString*)strUrl param:(NSMutableDictionary*)dictParam selSuc:(SEL)forSuc selFail:(SEL)forFail

{

    fetchSuccess = forSuc;

    

    fetchFail = forFail;

    

    NSLog(@"HttpWrapper method:%@ >> %@ ", method, strUrl);

    NSLog(@"%@",dictParam);

    

    NSURL *url = [NSURL URLWithString:strUrl];

    ASIFormDataRequest *requestMain = [ASIFormDataRequest requestWithURL:url];

    

    [requestMain setRequestMethod:method];

    

    if(dictParam != nil) {

        NSArray *allKey = [dictParam allKeys];

        for(int i=0; i<[allKey count]; i++) {

            NSString *key = [allKey objectAtIndex:i];            

            

            if([key isEqualToString:@"file"]) {

                NSMutableDictionary *dict = [dictParam valueForKey:key];

                NSString *filepath = [dict valueForKey:@"filepath"];

                NSString *filekey = [dict valueForKey:@"filekey"];

                [requestMain setFile:filepath forKey:filekey];

            } else {

                

                NSString *value = [dictParam valueForKey:key];

                [requestMain setPostValue:value forKey:key];

            }

        }

    }

    [requestMain setDelegate:self];

    [requestMain startAsynchronous];

    

}

- (void)requestFinished:(ASIHTTPRequest *)request {

    

    NSString *responseString = [request responseString];

    NSLog(@"HttpWrapper > requestFinished > %@",responseString);

    SBJSON *parser = [[[SBJSON alloc] init] autorelease];

    NSDictionary *dic = (NSDictionary *)[parser objectWithString:responseString error:nil];

    

    if([delegate respondsToSelector:fetchSuccess])

        [delegate performSelector:fetchSuccess withObject:dic];

    

    

    request = nil;

}

- (void)requestFailed:(ASIHTTPRequest *)request {

    NSError *error = [request error];

    NSLog(@"HttpWrapper > requestFailed > error: %@",error);

    

    request = nil;

    

    if([delegate respondsToSelector:fetchFail])

        [delegate performSelector:fetchFail withObject:error];

}

@end