connectionDidFinishLoading中的连接释放方法会导致错误

问题描述：

测试请求并在官方Apple开发人员网站中获取响应示例。connectionDidFinishLoading中的连接释放方法会导致错误

https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/URLLoadingSystem/Tasks/UsingNSURLConnection.html

使用[连接释放]方法connectionDidFinishLoading，导致错误：应该已经失效 - EXC_BAD_ACCESS

如果我评论线[连接释放]的方法;一切似乎工作，但恐怕有内存泄漏发生，因为不存在的连接释放。

什么可能导致或我该如何避免此问题？

@imlementation test 
NSMutableData *dataStore=nil;

//example usage: 
//[self registerToServer:@"http://testserver.com/registeruser.ashx" withUserName:@"john doe" withPassword:@"123456"]; 

-(void)registerToServer:(NSString*)urlstr withUserName:(NSString*) 
ausername withPassword:(NSString*)apassword 
{ 
    NSURL *url=[NSURL URLWithString:urlstr]; 
    NSMutableURLRequest *request=[NSMutableURLRequest requestWithURL:url cachePolicy:NSURLCacheStorageNotAllowed timeoutInterval:3.0f]; 
[request setHTTPMethod:@"POST"]; 
[request setValue:ausername forHTTPHeaderField:@"pass"]; 
[request setValue:apassword forHTTPHeaderField:@"username"]; 
NSURLConnection *connection=[NSURLConnection connectionWithRequest:request delegate:self]; 
[connection start]; 

if(connection) 
    dataStore=[[NSMutableData data]retain]; 
}

- （无效）连接：（NSURLConnection的*）连接didReceiveData：（NSData的*）数据 { [数据存储区appendData：数据]; }

- (void) connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response { 
[dataStore setLength:0];} 

-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error 
{ 
NSLog(@"connection failed:%@ %@", 
     [error localizedDescription], 
     [[error userInfo]objectForKey:NSURLErrorFailingURLStringErrorKey]); 

[connection release]; 
[dataStore release]; 
} 

-(void)connectionDidFinishLoading:(NSURLConnection *)connection 
    { 
    //[connection release]; //WELL... I CANT COMMENT OUT THIS LINE! 
    NSString *res=[[NSString alloc]initWithData:dataStore encoding:NSUTF8StringEncoding]; 

    NSLog(@"%@",res); 
[dataStore release]; 
    }

你如何创建'NSURLConnection'实例？ –

用NSURLConnection实例创建更新的问题。使用简单的CustomNSObject的单例实例。谢谢。 –

答

您使用工厂方法创建连接。如果您使用alloc/init，new，copy或retain，则应使用release。在这种情况下，系统将负责为您释放物体。

更好的是，使用ARC。

connectionDidFinishLoading中的连接释放方法会导致错误

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