IOS: Dictionary Return null value/Data - ios

Question

in my project i am using JSON parsing to display data for this i created 2 NSDictionary dictionary 1 return success response but when i call it in second dictionary it return Null value.
i am sharing my code please help me to correct it
-(void)hdata
{
NSString *post = [NSString stringWithFormat:#"data[Users][ref_id]=%#&api_key=bf45c093e542f057c123ae7d6",refidstr];
NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
NSString *postLength = [NSString stringWithFormat:#"%lu", (unsigned long)[postData length]];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
[request setURL:[NSURL URLWithString:#"http://192.168.0.20/hspCh/api/user_diagnose_list"]];
[request setHTTPMethod:#"POST"];
[request setValue:postLength forHTTPHeaderField:#"Content-Length"];
[request setValue:#"application/x-www-form-urlencoded" forHTTPHeaderField:#"Content-Type"];
[request setHTTPBody:postData];
NSURLResponse *response;
NSError *err;
NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&err];
[request setHTTPBody:postData];
NSString *str=[[NSString alloc]initWithData:responseData encoding:NSUTF8StringEncoding];
NSLog(#"str : %#",str);
NSDictionary *dict6 = [self cleanJsonToObject:responseData];
NSLog(#"str : %#",dict6); <=======it gives correct responce
diagnosisdict = [dict6 objectForKey:#"data[Users][ref_id]"];
[diagnosisdict setValue:refidstr forKey:#"data[Users][ref_id]"];
NSLog(#" for ref id =%# , data is= %#",refidstr, diagnosisdict); <======Gives null responce
}
Output of the above in console is as follows
2015-12-09 10:34:16.935 HcH[2841:32315] str : {"response":200,"diagnoses":[{"DiagnosesHospitals":{"hospital_id":"3341","id":"163075","discharges":"100.00","charge_amt":"1200.00","total_amt":"1500.00","medicare_amt":"1200.00"},"Diagnoses":{"diagnosis_name":"TRANSIENT ISCHEMIA"}}]}
2015-12-09 10:34:16.935 HcH[2841:32315] str : {
diagnoses = (
{
Diagnoses = {
"diagnosis_name" = "TRANSIENT ISCHEMIA";
};
DiagnosesHospitals = {
"charge_amt" = "1200.00";
discharges = "100.00";
"hospital_id" = 3341;
id = 163075;
"medicare_amt" = "1200.00";
"total_amt" = "1500.00";
};
}
);
response = 200;
}
2015-12-09 10:34:16.936 HcH[2841:32315] for ref id =3341 , data is= (null)

Answer 1

Replace this
diagnosisdict = [dict6 objectForKey:#"data[Users][ref_id]"];
with
diagnosisdict = [[[dict6 objectForKey:#"diagnoses"] objectAtIndex:0] objectForKey:#"DiagnosesHospitals"];

Answer 2

There is no entry in dict6 for "data[Users][ref_id]".
Using that string as a key is completely nonsensical, by the way. A key in this context is just a string, not a series of accesses in dictionaries.
It seems like what you want is dict6[#"data"][#"Users"][#"ref_id"].
However, this will also fail, because there is no entry for "data" in dict6.
It is possible that your cleanJSONToObject: method is stripping out the value of the "data" key. However, based on your statement that printing the value of dict6 gives the correct response, I assume that what you actually want to access is the value of "id" in "DiagnosesHospitals", since it sounds the most like a "ref_id".
Based on the output of the debugger, it seems as though you have a dictionary (dict6) with a "diagnoses" key pointing to an array with two dictionaries.
So, You would access the "id" field with dict6[diagnoses][0][#"DiagnosesHospitals"][#"id"], assuming that "id" is a string (I'm not sure why it has no quotes around it).

Answer 3

Somethings that you can get:
NSDictionary * diagnoses = dict6[#"diagnoses"];
NSString * diagnosis_name = diagnoses[0][#"Diagnoses"][#"diagnosis_name"];
NSDictionary * diagnosisdict = diagnoses[0][#"DiagnosesHospitals"];
NSString * hospital_id = diagnosisdict[#"hospital_id"];