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(NSZombie不会检测到任何内容)而崩溃。
我注意到,如果您将connectionDidFinishLoading
self.recievedData.length
打开到self.recievedData
,它就不会崩溃,看起来有一些数据存在。我得到self.networkConnection
的同样的事情 - 如果我只打印self.networkConnection
,那就没关系,但是如果我打印self.networkConnection.retainCount
(例如,任何ivar都可以工作)它会崩溃信号点。
我似乎无法掌握问题所在,并且我一直在寻找它安静一段时间,我会很感激一些帮助:)
TNX!
哦,我用这个代码叫它:
DataFetcher *fetcher = [[DataFetcher alloc] init];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:@"http://www.google.com"]];
[fetcher fetchDataWithRequest:request];
[fetcher release];
[request release];
答案 0 :(得分:0)
NSLog(@"%@", self.recievedData.length);
这里%@格式说明符意味着您将记录objective-c对象,而您实际传递普通整数 - 这会使您的应用程序崩溃。将您的日志更改为
NSLog(@"%d", self.recievedData.length);