NSMutableString 内存泄漏

发布于 2024-12-02 01:49:24 字数 1071 浏览 5 评论 0原文

我在代码中的仪器中遇到内存泄漏在此处输入图像描述

-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
       NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

     NSMutableString * res = [[[NSMutableString alloc] initWithBytes: [webData mutableBytes] length:[webData length] encoding:NSUTF8StringEncoding]autorelease];
     [webData release];
    [connection release];
        [res replaceOccurrencesOfString:@"&" withString:@"&amp;" options:NSCaseInsensitiveSearch range:(NSRange){0,[res length]}];
    [delegate getcat:res];

    [pool drain];
}



- (void)getcat:(NSString*)xml
{

if (xmlParser) {

    [xmlParser release];
}
Cid = [[NSMutableArray alloc] init];
Categories = [[NSMutableArray alloc] init];

NSData *data = [xml dataUsingEncoding:NSUTF8StringEncoding];
xmlParser = [[NSXMLParser alloc] initWithData:data];

[xmlParser setDelegate:self];

[xmlParser setShouldResolveExternalEntities:YES];
[xmlParser parse];
[xmlParser release];

}

这是管理内存的正确方法吗？

原文

I am getting memory leak in instruments in the code enter image description here

-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
       NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

     NSMutableString * res = [[[NSMutableString alloc] initWithBytes: [webData mutableBytes] length:[webData length] encoding:NSUTF8StringEncoding]autorelease];
     [webData release];
    [connection release];
        [res replaceOccurrencesOfString:@"&" withString:@"&" options:NSCaseInsensitiveSearch range:(NSRange){0,[res length]}];
    [delegate getcat:res];

    [pool drain];
}



- (void)getcat:(NSString*)xml
{

if (xmlParser) {

    [xmlParser release];
}
Cid = [[NSMutableArray alloc] init];
Categories = [[NSMutableArray alloc] init];

NSData *data = [xml dataUsingEncoding:NSUTF8StringEncoding];
xmlParser = [[NSXMLParser alloc] initWithData:data];

[xmlParser setDelegate:self];

[xmlParser setShouldResolveExternalEntities:YES];
[xmlParser parse];
[xmlParser release];

}

Is this the correct way to manage memory?

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忆依然 2024-12-09 01:49:24

与其设置一个自动释放池来实际释放字符串，为什么不自己释放它呢？如果委托保留了 getcat: 中的字符串，您可以简单地释放它：

- (void) connectionDidFinishLoading: (NSURLConnection *) connection
{
    // Omit the autorelease pool.

    NSMutableString * res = [[NSMutableString alloc] initWithBytes: [webData mutableBytes] length:[webData length] encoding:NSUTF8StringEncoding];
    [webData release];
    [connection release];
    [res replaceOccurrencesOfString:@"&" withString:@"&" options:NSCaseInsensitiveSearch range:NSMakeRange(0, res.length)];
    [delegate getcat:res];
    [res release];
}

看看 getcat:，我发现一个问题：

[xmlParser parse];
[xmlParser release];

通常，对象需要委托才能返回来自线程的结果。我假设 [xmlParser parse] 启动一个线程。您可能不应该在完成之前释放它，即您在 parserDidEndDocument: 中执行此操作。

然而，这并不能解释许多泄露的字符串。

Instead of setting up an autorelease pool, which will actually release the string, why don't you just release it yourself? If the delegate retains the string in getcat:, you can simply release it:

- (void) connectionDidFinishLoading: (NSURLConnection *) connection
{
    // Omit the autorelease pool.

    NSMutableString * res = [[NSMutableString alloc] initWithBytes: [webData mutableBytes] length:[webData length] encoding:NSUTF8StringEncoding];
    [webData release];
    [connection release];
    [res replaceOccurrencesOfString:@"&" withString:@"&" options:NSCaseInsensitiveSearch range:NSMakeRange(0, res.length)];
    [delegate getcat:res];
    [res release];
}

Taking a look at getcat:, I see a problem:

[xmlParser parse];
[xmlParser release];

Usually, objects need a delegate to return results from a thread. I assume that [xmlParser parse] starts a thread. You should probably not release it before it is finished, i.e. you do that in parserDidEndDocument:.

This does however not explain the many leaked strings.

回复收藏 0 原文

纸伞微斜 2024-12-09 01:49:24

我修复了这个问题

泄漏位于

(void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI QualifiedName:(NSString *)qName attribute:(NSDictionary *)attributeDict{
currentElement = [elementName copy];--->这一行总是泄漏，但泄漏仪器显示该行

}