Returning NSString instead of NSDictionary - ios

Question

I am using a method to call the Web Services and Upload the Transcription Audio File On the Server. The method is as follows:
- (NSDictionary *)UploadTranscriptionAudio:(NSString *)uploadfor forPN_ID:(NSString
*)pn_id forTaskFlag:(NSString *)taskflag documentPath:(NSString *)documentpath
forUserName:(NSString *)username file_path_msd:(NSString *)file_path_msd
audioFilePath:(NSString *)audiofilepath{
NSDictionary *response = nil;
NSURL * url = [NSURL URLWithString:[AppDelegate sharedInstance].str_webServiceUrl];
ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:url];
[request setPostValue:uploadfor forKey:#"Uploadfor"];
[request setPostValue:pn_id forKey:#"PNID"];
[request setPostValue:taskflag forKey:#"task_flag"];
[request setPostValue:documentpath forKey:#"Path"];
[request setPostValue:username forKey:#"Username"];
[request setPostValue:file_path_msd forKey:#"file_path_msd"];
[request setFile:audiofilepath forKey:#"uploadedfile"];
[request startSynchronous];
NSError *error = [request error];
if (!error) {
response = (NSDictionary*)[request responseString];
NSLog(#"Response = %#",response);
return response;
}
return response;
}
This method is still returning me a NSstring in response. What i want is that this method should return me a NSDictionary. As I have to use the value for the keys inside that dictionary somewhere else. Can somebody help me on this.

Answer 1

hello shikher maddy says right n u can parse string as follow
if (responseString == NULL) {
// do something u want
} else {
NSDictionary *jsonResponse = [responseString JSONValue];
NSLog(#" %#",jsonResponse);
}

Answer 2

If I were you I would use SBJSONParser like this:
SBJsonParser *parser= [[SBJsonParser alloc] init];
NSDictionary *dictionnary = [parser objectWithString:responseString error:nil];