Parse JSON text in a textfield (My result is NULL) - ios

Question

I am making an iOS application which communicate with an database via an API. The API sends valid JSON to the application but the application gives no error but another result: NULL.
Here is my code for the iOS app:
// Start hud
MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:self.view animated:YES];
hud.labelText = #"Zoeken...";
return TRUE;
}
- (void)requestFinished:(ASIHTTPRequest *)request
{
[MBProgressHUD hideHUDForView:self.view animated:YES];
if (request.responseStatusCode == 400) {
textView.text = #"Invalid code";
} else if (request.responseStatusCode == 403) {
textView.text = #"Code already used";
} else if (request.responseStatusCode == 204) {
textView.text = #"No content";
} else if (request.responseStatusCode == 412) {
textView.text = #"Precondition Failed";
} else if (request.responseStatusCode == 200) {
NSString *responseString = [request responseString];
NSDictionary *responseDict = [responseString JSONValue];
// NSString *naam = [responseDict objectForKey:#"DEB_NR"];
NSString *part0 = [responseDict objectForKey:#"klntnr"];
NSString *part1 = [responseDict objectForKey:#"klntnm"];
NSString *part2 = [responseDict objectForKey:#"adrs"];
NSString *show = [NSString stringWithFormat:#"\r%#\r%#\r%#" , part0 , part1 , part2 ];
// if ([unlockCode compare:#"com.razeware.test.unlock.cake"] == NSOrderedSame) {
textView.text = [NSString stringWithFormat:#"Resultaten: %#", show];
// } else {
// textView.text = [NSString stringWithFormat:#"Resultaat: %#", unlockCode];
// }
} else {
textView.text = #"Unexpected error API ERROR";
}
}
- (void)requestFailed:(ASIHTTPRequest *)request
{
[MBProgressHUD hideHUDForView:self.view animated:YES];
NSError *error = [request error];
textView.text = error.localizedDescription;
}
#end
Thanks in advance,
Maurice.

Answer 1

It would really help if you just show the JSON string;
But try this
else if (request.responseStatusCode == 200) {
NSError* error;
NSString *responseString = [request responseString];
NSArray *responseObj = [NSJSONSerialization JSONObjectWithData: [responseString dataUsingEncoding:NSUTF8StringEncoding] options: NSJSONReadingMutableContainers error: &error];
NSString *part0=#"";
NSString *part1=#"";
NSString *part2=#"";
for (int i=0; i<[responseObj count]; i++) {
NSDictionary *dataDict = [responseObj objectAtIndex:i];
NSString *part0 = [dataDict objectForKey:#"klntnr"];
NSString *part1 = [dataDict objectForKey:#"klntnm"];
NSString *part2 = [dataDict objectForKey:#"adrs"];
}
NSString *show = [NSString stringWithFormat:#"\r%#\r%#\r%#" , part0 , part1 , part2 ];
textView.text = [NSString stringWithFormat:#"Resultaten: %#", show];
}