current location from CoreLocation - iphone-sdk-3.0

Question

I have an App which launches the google Map App. The code is:
UIApplication *app = [UIApplication sharedApplication];
[app openURL:[[NSURL alloc] initWithString: #"http://maps.google.com/maps?daddr=Obere+Laube,+Konstanz,+Germany&saddr="]];
The saddr= should be the current location. I get the current location with
-(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
NSLog(#"%f,%f", [newLocation coordinate]);
The Log displays the correct coordinates like
2010-04-05 15:33:25.436 deBordeaux[60657:207] 37.331689,-122.030731
I didn't find the right way to transmit the coordinates to the url-string. Does someone can give me a hint how-to?
Hmmm, I had the entry in my .h
In my method I use "newLocation" instead your "location". The code is:
-(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation
fromLocation:(CLLocation *)oldLocation {
NSLog(#"%f,%f", [newLocation coordinate]);
NSLog(#"%f", [newLocation coordinate].latitude);
storedLocation = [newLocation coordinate];
NSLog(#"Standort neu String: %#", storedLocation);
As result I get :
2010-04-05 20:28:44.397 deBordeaux[64179:207] 37.331689,-122.030731
2010-04-05 20:28:44.398 deBordeaux[64179:207] 37.331689
Program received signal: “EXC_BAD_ACCESS”.

Answer 1

You shouldn't use addr parameter of the URL but ll.
You should pass latitude and longitude as
http://maps.google.com/maps?daddr=Obere+Laube,+Konstanz,+Germany&ll=37.331689,-122.030731
and you can obtain them from the CLocation throught
[location coordinate].latitude
[location coordinate].longitude
EDIT:
First of all you can directly store an object of type CLLocationCoordinate2D and then convert it to a NSString when you need:
// in your .h
CLLocationCoordinate2D storedLocation;
// in your method
storedLocation = [location coordinate];
// when you want to ask google maps
[NSString stringWithFormat:#"http://maps.google.com/maps?daddr=Obere+Laube,+Konstanz,+Germany&ll=%f,%f", storedLocation.latitude, storedLocation.longitude];
Mind that CLLocationCoordinate2D is defined as
typedef struct {
CLLocationDegrees latitude;
CLLocationDegrees longitude;
} CLLocationCoordinate2D;
where you have typedef double CLLocationDegrees