How do I convert NSData to NSDictionary using NSJSONSerialization? - ios

Question

Hi I am facing problem in conversion of NSData to NSDictionary using NSJSONSerialization?
I got data using my code but unable to convert it into json.
Here is my code...
ViewController.h File
#import <UIKit/UIKit.h>
#interface ViewController : UIViewController<NSURLConnectionDelegate>
{
NSString *massage;
NSURL *url;
NSMutableURLRequest *request;
NSURLConnection *connection;
NSMutableData *httpbody;
NSMutableData *webData;
NSData *responceData;
NSDictionary *responceJson;
}
and ViewController.m File
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
NSString *mobile = #"123456789";
NSString *password = #"Welcome123";
NSString *deviceId = #"123sdfg15641ert321ret";
url = [NSURL URLWithString:#"http://203.109.87.34:8585/d-cab/web/app_dev.php/api/v1"];
massage = [NSString stringWithFormat:#"{\"action\":\"login\",\"data\":{\"contact\":\"%#\",\"password\":\"%#\",\"deviceId\":\"%#\"}}",mobile,password,deviceId];
//NSLog(#"Body = %#", massage);
httpbody = [ NSMutableData dataWithBytes: [ massage UTF8String ] length: [ massage length ] ];
request = [NSMutableURLRequest requestWithURL: url];
[request setHTTPMethod: #"POST"];
[request setHTTPBody: httpbody];
[request setTimeoutInterval:10.0];
connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
//NSURLConnection *connection = [NSURLConnection connectionWithRequest:request delegate:self];
//[connection start];
if (connection) {
webData = [[NSMutableData alloc]init];
}
}
#pragma mark NSURLConnection Delegate Methods
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
[webData setLength:0];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[webData appendData:data];
//NSLog(#"WebData = %#",webData);
//NSLog(#"=================================");
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
NSError* error = nil;
responceJson = [NSJSONSerialization JSONObjectWithData:webData options:kNilOptions error:&error];
NSLog(#"ResponceJSON = %#",responceJson);
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
// Show error message
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:#"Error In connection" message:#"We are facing some problem in connection. Please Check your Internet Connection." delegate:self cancelButtonTitle:#"Ok" otherButtonTitles:nil, nil];
[alert show];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end
Please Check my code and tell me where and what change I have to make?

Answer 1

Hey Thanks to all who gave attention to my question.... But I found the problem in my question.
I am trying to send the parameter into string format instead of dictionary format and not specifying header to request. Here is my updated code...
NSDictionary *paramData = [[NSDictionary alloc]initWithObjectsAndKeys:mobile,#"contact",password,#"password",deviceId,#"deviceId", nil];
//NSLog(#"paramData = %#",paramData);
jsonParam = [[NSDictionary alloc]initWithObjectsAndKeys:#"login",#"action",paramData,#"data", nil];
//NSLog(#"jsonParam = %#",jsonParam);
httpbody = [NSJSONSerialization dataWithJSONObject:jsonParam options:0 error:nil];
request = [NSMutableURLRequest requestWithURL: url];
request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10.0];
[request setHTTPMethod:#"POST"];
[request setValue:#"application/json" forHTTPHeaderField:#"Accept"];
[request setValue:#"application/json" forHTTPHeaderField:#"Content-Type"];
[request setValue:[NSString stringWithFormat:#"%d", [httpbody length]] forHTTPHeaderField:#"Content-Length"];
[request setHTTPBody: httpbody];
connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
if (connection) {
webData = [[NSMutableData alloc]init];
}
It worked for me....

Answer 2

Try using the following code :
responceJson = [NSJSONSerialization JSONObjectWithData:webData
options:NSJSONReadingMutableContainers
error:&error];

Answer 3

Well the problem here is not in conversion problem is in this funtion
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
//[webData setLength:0];
webdData = [[NSMutableData alloc] init];
}
It will help.Thanks

Answer 4

NSURLConnection *theConnection = [NSURLConnection connectionWithRequest:request delegate:self];
if( theConnection )
{
mdata = [[NSMutableData alloc]init];
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
mdata.length=0;
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
[mdata appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
// Data store in dictionary when connection proceed in background
dict=[NSJSONSerialization JSONObjectWithData:mdata options:kNilOptions error:nil];
NSLog(#"%#",dict);
}
This is working gooood...

Answer 5

Try to check, what your connection is load. Converting NSData to NSString. In didFinishLoading typing this:
NSString *tempString = [[NSString alloc] initWithData:webData encoding:NSUTF8StringEncoding];
NSLog(#"loaded data: %#",tempString);