iOS Convert NSData to NSDictionary returns nil? - ios

Question

In My code I want to convert NSData to NSDictionary but it returns nil I don't know what mistake I made,I Used NSJSONSerialization for convert data to dictionary, The NSData was received from server response.
Here I show my Full code what I am trying.
-(void)SendPushNotification:(NSString*)getUrl :(NSMutableDictionary *)getData withCompletionBlock:(void(^)(NSDictionary *))completionBlock
{
NSError *error;
NSLog(#"dict val: %#",getData);
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:getData options:NSJSONWritingPrettyPrinted error:&error];// Pass 0 if you don't care about the readability of the generated string
NSString *jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
NSData *postData = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
NSString *postLengthas = [NSString stringWithFormat:#"%lu",(unsigned long)[postData length]];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:getUrl]
cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:100.0];
NSString *chkRegDevice= [[NSUserDefaults standardUserDefaults] stringForKey:#"bearer"];
NSString *strfds=[NSString stringWithFormat:#"bearer %#",chkRegDevice];
[request setHTTPMethod:#"POST"];
[request setValue:postLengthas forHTTPHeaderField:#"Content-Length"];
[request setValue:#"application/json" forHTTPHeaderField:#"Content-Type"];
[request setValue:strfds forHTTPHeaderField:#"Authorization"];
[request setHTTPBody:postData];
NSURLSessionConfiguration *configg=[NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession*sessionn=[NSURLSession sessionWithConfiguration:configg delegate:nil delegateQueue:[NSOperationQueue mainQueue]];
NSURLSessionDataTask *taskk=[sessionn dataTaskWithRequest:request completionHandler:^(NSData *data,NSURLResponse *responce,NSError *error){
if(error)
{
NSLog(#"%#", [error localizedDescription]);
completionBlock(nil);
}else{
NSError *jsonError;
NSString *clientDetail = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];
NSLog(#"clientDetail: %#", clientDetail);
NSData *objectDataaaaa = [clientDetail dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:objectDataaaaa options:NSJSONReadingMutableContainers error:&jsonError];
NSLog(#"json %#",json);
if (![clientDetail isEqualToString:#"Object reference not set to an instance of an object."]) {
if (completionBlock) {
completionBlock(json);
}
}
else
{
completionBlock(nil);
}
}
}];
[taskk resume];
}
Here the following response I get to convert NSData to NSString.
"{\"multicast_id\":8856529321585625357,\"success\":1,\"failure\":0,\"canonical_ids\":0,\"results\":[{\"message_id\":\"0:1534479035021563%1dbdaa031dbdaa03\"}]}"

Answer 1

Pass NSData object(data) directly to JSONObjectWithData.
Also, to check the error, you can print jsonError.

Answer 2

Try the following code:
NSError* error;
NSData *objectDataaaaa = [clientDetail dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary* json = [NSJSONSerialization JSONObjectWithData:objectDataaaaa
options:kNilOptions
error:&error];
NSLog(#"JSON DICT: %#", json);

Answer 3

Try this.
NSString* str = your string data;
NSData* data = [str dataUsingEncoding:NSUTF8StringEncoding];
NSString *decodeString = [[NSString alloc] initWithData:data
encoding:NSASCIIStringEncoding];
NSDictionary *dict = [self dictionaryWithJsonString:decodeString];
/////////////////////
- (NSDictionary *)dictionaryWithJsonString:(NSString *)jsonString {
if (jsonString == nil) {
return nil;
}
NSData *jsonData = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
NSError *err;
NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:jsonData
options:NSJSONReadingMutableContainers
error:&err];
if(err) {
return nil;
}
return dic;
}