xml解析期間的內存泄漏問題？

Question

我得到了內存泄漏的奇怪問題，

現在我的代碼，

-(NSMutableDictionary *)getParsedWallpaperData{ 
NSMutableDictionary *dataDictionary = [NSMutableDictionary dictionary]; 

NSData *xmlData = [NSData dataWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"Wallpaper" ofType:@"xml"]]; 
TBXML *tbXml = [[TBXML alloc] initWithXMLData:xmlData error:nil]; 

//TBXML *tbXml = [[TBXML tbxmlWithXMLData:xmlData error:nil] autorelease]; 

@synchronized(self){ 
    TBXMLElement *rootXMLElement = tbXml.rootXMLElement; 

    if(rootXMLElement) 
    { 
     TBXMLElement *paging = [TBXML childElementNamed:kPaging parentElement:rootXMLElement]; 
     NSMutableDictionary *pagingData = [[NSMutableDictionary alloc] init]; 
     if(paging){ 
      TBXMLElement *totalPages = [TBXML childElementNamed:kTotalPages parentElement:paging]; 
      NSString *totalPagesString = [TBXML textForElement:totalPages]; 
      [pagingData setObject:totalPagesString forKey:@"TotalPages"]; 

      TBXMLElement *currentPage = [TBXML childElementNamed:kCurrentPage parentElement:paging]; 
      NSString *currentPageString = [TBXML textForElement:currentPage]; 
      [pagingData setObject:currentPageString forKey:@"CurrentPage"]; 

      TBXMLElement *prevPage = [TBXML childElementNamed:kPerviousPage parentElement:paging]; 
      NSString *prevPageString = [TBXML textForElement:prevPage]; 
      [pagingData setObject:prevPageString forKey:@"PreviousPage"]; 

      TBXMLElement *nextPage = [TBXML childElementNamed:kNextPage parentElement:paging]; 
      NSString *nextPageString = [TBXML textForElement:nextPage]; 
      [pagingData setObject:nextPageString forKey:@"NextPage"]; 
     } 
     [dataDictionary setObject:pagingData forKey:@"PagingInfo"]; 
     [pagingData release]; 
     pagingData = nil; 

     TBXMLElement *totalItems = [TBXML childElementNamed:kTotalItems parentElement:rootXMLElement]; 
     NSString *totalItemsString = [TBXML textForElement:totalItems]; 
     [dataDictionary setObject:totalItemsString forKey:@"TotalItems"]; 

     NSMutableArray *itemArray = [[NSMutableArray alloc] initWithCapacity:[totalItemsString intValue]]; 

     TBXMLElement *items = [TBXML childElementNamed:kItems parentElement:rootXMLElement]; 
     if(items){ 
      TBXMLElement *item = [TBXML childElementNamed:kItem parentElement:items]; 
      while (item) { 
       NSMutableDictionary *itemInfoDict = [[NSMutableDictionary alloc] init]; 
       TBXMLElement *title = [TBXML childElementNamed:kTitle parentElement:item]; 
       NSString *titleString = [TBXML textForElement:title]; 
       [itemInfoDict setObject:titleString forKey:@"Title"]; 

       TBXMLElement *image1 = [TBXML childElementNamed:kImage1 parentElement:item]; 
       NSString *image1String = [TBXML textForElement:image1]; 
       [itemInfoDict setObject:image1String forKey:@"Image1"]; 

       TBXMLElement *image2 = [TBXML childElementNamed:kImage2 parentElement:item]; 
       NSString *image2String = [TBXML textForElement:image2]; 
       [itemInfoDict setObject:image2String forKey:@"Image2"]; 

       TBXMLElement *image3 = [TBXML childElementNamed:kImage3 parentElement:item]; 
       NSString *image3String = [TBXML textForElement:image3]; 
       [itemInfoDict setObject:image3String forKey:@"Image3"]; 

       TBXMLElement *thumbnail = [TBXML childElementNamed:kThumbnail parentElement:item]; 
       NSString *thumbnailString = [TBXML textForElement:thumbnail]; 
       [itemInfoDict setObject:thumbnailString forKey:@"Thumbnail"]; 

       [itemArray addObject:itemInfoDict]; 
       [itemInfoDict release]; 
       itemInfoDict = nil; 
       item = item -> nextSibling; 
      } 
     } 
     [dataDictionary setObject:itemArray forKey:@"ImagesInfo"]; 
     [itemArray release]; 
     itemArray = nil; 
    } 
} 

[tbXml release]; 
tbXml = nil; 
return dataDictionary; 
} 

我發現內存泄漏只TBXML * TBXML = [[TBXML頁頭] initWithXMLData：XMLDATA錯誤：零]在這一行上，即使我手動釋放tbXml對象，

請給我建議y發生這種情況？

感謝，

Answer 1

那麼，如果它的根元素有展示爲漏水，我想知道，如果像childElementNamed的訪問者的一個原因造成的（通過返回的東西，就像一個的NSString但實際上也已經優化了存儲回根元素的指針）。你可以看看childElementNamed的執行情況嗎？一種相對較快的方式來更改您的代碼，以確保它不是將您要存儲在dataDictionary那裏的任何NSString結果用[NSString stringWithFormat:@"%@", [TBXML textForElement:fooTitle]]調用打包。

此外，如果TBXML正在創建大量的自動釋放對象，則可以將此函數包裝在一個@nsautoreleasepool宏中。

作爲最終建議，如果可以的話，您應該看看ARC（即，如果您正在部署到iOS 4+）。

Answer 2

在你的函數的頂部添加此行：

NSAutoreleasePool *Pool=[[NSAutoreleasePool alloc]init]; 

，並在你的函數的底部之前加入這一行「return」語句：

[Pool drain]; 

也許這將幫助你。