ロケーションマネージャーを使用してロケーションデータを生成し、URLで送信してデータをダウンロードしています。初めてロケーションマネージャーを呼び出すと、現在の場所が正しく返され、現在の場所に基づいてURLからデータを取得できます。
ただし、現在の場所をもう一度取得しようとすると、EXC_BAD_EXCESSを受け取ります。
それを使ってデバッグしようとすると、メソッド内のゾンビとしてNSZombieEnabled表示されます。（以下のマークされたコードを参照）FirstViewController.recievedDatadidReceiveResponse
さらに掘り下げてみると、最初の接続を解放した後、不明な接続が確立され、receivedDataすでに解放されている接続にアクセスしようとしていることがわかりました。
ヘッダーファイル情報： `
#import <CoreLocation/CoreLocation.h>
define SECS_OLD_MAX 1
@interface FirstViewController : UIViewController<CLLocationManagerDelegate> {
UIActivityIndicatorView *spinner;
CLLocationManager *locationManager;
CLLocation *startingPoint;
UIButton *relocateMe;
NSMutableData *receivedData;
NSString *lat;
NSString *lon;
}
@property (nonatomic, retain) IBOutlet UIActivityIndicatorView *spinner;
@property (nonatomic, retain) CLLocationManager *locationManager;
@property (nonatomic, retain) CLLocation *startingPoint;
@property (nonatomic, retain) IBOutlet UIButton *relocateMe;
@property (nonatomic, retain) NSMutableData *receivedData;
@property (nonatomic, retain) NSString *lat;
@property (nonatomic, retain) NSString *lon;
`
.mファイルコード：
//飼い葉桶を開始します：
[spinner startAnimating];
**EDIT**************************ADDED IN THE AUTORELEASE POOL BY HIB********************************
self.locationManager = [[[CLLocationManager alloc] init]autorelease];
// Detecting the user device
NSString *currentDevice = [[UIDevice currentDevice] model];
// if its iPhone then locate the current lattitude and longitude
if([currentDevice isEqualToString:@"iPhone"] || [currentDevice isEqualToString:@"iPhone 3G"] || [currentDevice isEqualToString:@"iPhone 3G S"]){
DLog(@"I have identified the device as an iPhone");
if(locationManager.locationServicesEnabled == YES){
DLog(@"ok now the location manager gets the property");
locationManager.delegate = self;
// This is the most important property to set for the manager. It ultimately determines how the manager will
// attempt to acquire location and thus, the amount of power that will be consumed.
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
// Once configured, the location manager must be "started".
[locationManager startUpdatingLocation] ;
}else {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Oops!"
message:@"Please enable location servies"
delegate:nil
cancelButtonTitle:@"OK"
otherButtonTitles:nil];
[alert show];
[alert release];
}
}
//if its iPod then fetch the city based restaurants
else if([currentDevice isEqualToString:@"iPod touch"] || [currentDevice isEqualToString:@"iPod touch 2G"]){
}
else if([currentDevice isEqualToString:@"iPhone Simulator"]){
//TechZen says: there appears to be some code missing here, not sure if its relevant
}
//didupdatetolocationメソッド
- (void)locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *)newLocation
fromLocation:(CLLocation *)oldLocation {
// store the location as the "best effort"
DLog(@"Lat = %g Long = %g",newLocation.coordinate.latitude,newLocation.coordinate.longitude);
NSDate *eventDate = newLocation.timestamp;
NSTimeInterval howRecent = [eventDate timeIntervalSinceNow];
DLog(@"NSTIME INTERVAL = %i",howRecent);
//Is the event recent and accurate enough ?
if (abs(howRecent) < SECS_OLD_MAX) {
self.lat = [NSString stringWithFormat:@"%g",newLocation.coordinate.latitude];
self.lon = [NSString stringWithFormat:@"%g",newLocation.coordinate.longitude];
[[NSUserDefaults standardUserDefaults] setObject:lat forKey:@"LATITUDE"];
[[NSUserDefaults standardUserDefaults] setObject:lon forKey:@"LONGITUDE"];
DLog(@"inside Lat = %g Long = %g",newLocation.coordinate.latitude,newLocation.coordinate.longitude);
self.startingPoint = newLocation;
[locationManager stopUpdatingLocation];
**EDIT********************************REMOVED BY HIB******************************
self.locationManager = nil;
[locationManager release];
**EDIT********************************REMOVED BY HIB******************************
**ADDED BY HIB********************************************
locationManager.delegate = nil;
**ADDED BY HIB********************************************
@try {
//passing the parameter for more condition
self.lat = [NSString stringWithFormat:@"%g",startingPoint.coordinate.latitude];
self.lon = [NSString stringWithFormat:@"%g", startingPoint.coordinate.longitude];
NSString *string2 = [[NSString alloc] initWithFormat:@"%@/Service.asmx/someMethod?lat1=%g&lon1=%g&recordSize=0"
,[[NSUserDefaults standardUserDefaults] stringForKey:@"textEntry_key"],startingPoint.coordinate.latitude,startingPoint.coordinate.longitude];
NSURL *url = [[NSURL alloc] initWithString:string2];
[string2 release];
NSMutableURLRequest* request2=[NSMutableURLRequest requestWithURL:url];
[request2 setHTTPMethod:@"GET"];
[request2 setTimeoutInterval:25.0];
[[NSURLCache sharedURLCache] setMemoryCapacity:0];
[[NSURLCache sharedURLCache] setDiskCapacity:0];
NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:request2 delegate:self];
if (theConnection) {
receivedData = [[NSMutableData data]retain];
} else {
// inform the user that the download could not be made
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Sorry !"
message:@"The server is not avaialable \n Please try againa later"
delegate:nil
cancelButtonTitle:@"OK"
otherButtonTitles:nil];
[alert show];
[spinner stopAnimating];
}
[url release];
}
@catch (NSException * e) {
}
@finally {
}
}
}
//およびデリゲートメソッド
#pragma mark -
#pragma mark connection methods
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
// this method is called when the server has determined that it
// has enough information to create the NSURLResponse
// it can be called multiple times, for example in the case of a
// redirect, so each time we reset the data.
// receivedData is declared as a method instance elsewhere
**************************************the zombie is here *********************************
[receivedData setLength:0];
*****************************************************************************************
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
// append the new data to the receivedData
// receivedData is declared as a method instance elsewhere
[receivedData appendData:data];
}
- (void)connection:(NSURLConnection *)connection
didFailWithError:(NSError *)error
{
[spinner stopAnimating];
// release the connection, and the data object
[connection release];
// receivedData is declared as a method instance elsewhere
[receivedData release];
// inform the user
DLog(@"Connection failed! Error - %@ %@",
[error localizedDescription],
[[error userInfo] objectForKey:NSErrorFailingURLStringKey]);
// alert the user in the inter face.
UIAlertView* alert = [[UIAlertView alloc]initWithTitle:@"Sorry !"
message:@"The server is not available.\n Please try again later."
delegate:nil
cancelButtonTitle:@"OK"
otherButtonTitles:nil];
[alert show];
[alert release];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
// do something with the data
// receivedData is declared as a method instance elsewhere
DLog(@"Succeeded! Received %d bytes of data",[receivedData length]);
[spinner stopAnimating];
// release the connection, and the data object
if(receivedData == nil)
{
UIAlertView* alert = [[UIAlertView alloc]initWithTitle:@"Sorry !"
message:@"The server is not available.\n Please try again later or select city."
delegate:nil
cancelButtonTitle:@"OK"
otherButtonTitles:nil];
[alert show];
[alert release];
[spinner stopAnimating];
}
else
{
//just parse and use the data
}
[connection release];
[receivedData release];
}
助けてください 。ハマった。