Im trying to get Data from google distance api using NSURLSession but as seen below in code when i print response and data, i get the results as NULL. What can be the issue? or is there any other better way of fetching JSON data.
NSString *urlAsString = [NSString stringWithFormat:@"https://maps.googleapis.com/maps/api/distancematrix/json?origins=Vancouver+BC|Seattle&destinations=San+Francisco|Victoria+BC&mode=bicycling&language=fr-FR&key=API-KEY"];
NSURL *url = [NSURL URLWithString:urlAsString];
NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
[[session dataTaskWithURL:[NSURL URLWithString:urlAsString]
completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
NSLog(@"RESPONSE: %@",response);
NSLog(@"DATA: %@",data);
}] resume];
You should use stringByAddingPercentEscapesUsingEncoding:
on your url string, this is why you didn't get a response : the server returned an error.
You should have checked the error
;)
I replaced your API key in URL string, remember to put your own if you copy/paste my code :)
NSString *urlAsString = [NSString stringWithFormat:@"https://maps.googleapis.com/maps/api/distancematrix/json?origins=Vancouver+BC|Seattle&destinations=San+Francisco|Victoria+BC&mode=bicycling&language=fr-FR&key=YOUR-API-KEY"];
NSCharacterSet *set = [NSCharacterSet URLQueryAllowedCharacterSet];
NSString *encodedUrlAsString = [urlAsString stringByAddingPercentEncodingWithAllowedCharacters:set];
NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
[[session dataTaskWithURL:[NSURL URLWithString:encodedUrlAsString]
completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
NSLog(@"RESPONSE: %@",response);
NSLog(@"DATA: %@",data);
if (!error) {
// Success
if ([response isKindOfClass:[NSHTTPURLResponse class]]) {
NSError *jsonError;
NSDictionary *jsonResponse = [NSJSONSerialization JSONObjectWithData:data options:0 error:&jsonError];
if (jsonError) {
// Error Parsing JSON
} else {
// Success Parsing JSON
// Log NSDictionary response:
NSLog(@"%@",jsonResponse);
}
} else {
//Web server is returning an error
}
} else {
// Fail
NSLog(@"error : %@", error.description);
}
}] resume];
You might get a really good hint if you print out what's returned in the error parameter.
I.E.:
NSString *unencodedURLString = [NSString stringWithFormat:@"https://maps.googleapis.com/maps/api/distancematrix/json?origins=Vancouver+BC|Seattle&destinations=San+Francisco|Victoria+BC&mode=bicycling&language=fr-FR&key=API-KEY"];
NSString *encodedURLString = (NSString *)CFURLCreateStringByAddingPercentEscapes(
NULL,
(CFStringRef)unencodedURLString,
NULL,
(CFStringRef)@"!*'();:@&=+$,/?%#[]",
kCFStringEncodingUTF8 );
[[session dataTaskWithURL:[NSURL URLWithString:encodedURLString]
completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
if (error != nil)
{
// if there's an error, print it out...
NSLog(@"error in NSURLSession is %@", [error localizedDescription]);
} else {
NSLog(@"RESPONSE: %@",response);
NSLog(@"DATA: %@",data);
}
}] resume];
The URL encoding routine I'm using is found here.
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With