所以我上课了:
DataFetcher.h
#import <Foundation/Foundation.h>
@interface DataFetcher : NSObject
{
NSURLConnection *networkConnection;
NSMutableData *recievedData;
BOOL isFetchingFinished;
}
@property (nonatomic, retain) NSMutableData *recievedData;
@property (nonatomic, retain) NSURLConnection *networkConnection;
- (void)fetchDataWithRequest:(NSMutableURLRequest *)request;
DataFetcher.m:
#import "DataFetcher.h"
@implementation DataFetcher
@synthesize recievedData;
@synthesize networkConnection;
- (id)init
{
self = [super init];
if (self) {
NSMutableData *data = [[NSMutableData alloc] initWithLength:0];
self.recievedData = data;
[data release];
}
return self;
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
NSLog(@"Connection Error:%@\n Failure Reason:%@", [error localizedDescription], [error localizedFailureReason]);
[networkConnection release];
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
[self.recievedData appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
[networkConnection release];
NSLog(@"%@", self.recievedData.length);
[self processData];
}
- (void)fetchDataWithRequest:(NSMutableURLRequest *)request
{
NSURLConnection *aConnection = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:NO];
self.networkConnection = aConnection;
[aConnection release];
[self.networkConnection start];
if( !self.networkConnection )
{
NSLog(@"Connection failed! recieved nil at alloc point");
}
}
- (void)dealloc
{
[super dealloc];
[recievedData release];
}
@end
通常它会因为 EXC_BAD_ACCESS 而崩溃(NSZombie 不会检测到任何东西)。我注意到,如果您打开to just ,它不会崩溃connectionDidFinishLoading
,并且看起来那里有一些数据。我得到同样的东西- 如果我只是 print ,没关系,但如果我打印(例如,任何 ivar 都可以),它会因相同的信号而崩溃。self.recievedData.length
self.recievedData
self.networkConnection
self.networkConnection
self.networkConnection.retainCount
我似乎无法理解问题出在哪里,我已经安静地寻找了一段时间,我将不胜感激 :)
Tnx!
哦,我用这段代码调用它:
DataFetcher *fetcher = [[DataFetcher alloc] init];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:@"http://www.google.com"]];
[fetcher fetchDataWithRequest:request];
[fetcher release];
[request release];