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RSS 피드를 구문 분석하는 앱을 만들고 있습니다. 앱에는 피드의 요소에 대해 서로 다른 두 가지 유형의 피드가 있으므로 파싱하기 전에 각 피드의 요소 이름을 사용하는 NSXMLParser NSObject를 만들었습니다. 여기 내 코드입니다 :Iphone NSXMLParser NSCFString 메모리 누수
NewsFeedParser.h는
#import
@interface NewsFeedParser : NSObject {
NSInteger NewsSelectedCategory;
NSXMLParser *NSXMLNewsParser;
NSMutableArray *newsCategories;
NSMutableDictionary *NewsItem;
NSMutableString *NewsCurrentElement, *NewsCurrentElement1, *NewsCurrentElement2, *NewsCurrentElement3;
NSString *NewsItemType, *NewsElement1, *NewsElement2, *NewsElement3;
NSInteger NewsNumElements;
}
- (void) parseXMLFileAtURL:(NSString *)URL;
@property(nonatomic, retain) NSString *NewsItemType;
@property(nonatomic, retain) NSString *NewsElement1;
@property(nonatomic, retain) NSString *NewsElement2;
@property(nonatomic, retain) NSString *NewsElement3;
@property(nonatomic, retain) NSMutableArray *newsCategories;
@property(assign, nonatomic) NSInteger NewsNumElements;
@end
NewsFeedParser.m
#import "NewsFeedParser.h"
@implementation NewsFeedParser
@synthesize NewsItemType;
@synthesize NewsElement1;
@synthesize NewsElement2;
@synthesize NewsElement3;
@synthesize newsCategories;
@synthesize NewsNumElements;
- (void)parserDidStartDocument:(NSXMLParser *)parser{
}
- (void)parseXMLFileAtURL:(NSString *)URL
{
newsCategories = [[NSMutableArray alloc] init];
URL = [URL stringByReplacingOccurrencesOfString:@" " withString:@""];
URL = [URL stringByReplacingOccurrencesOfString:@"\n" withString:@""];
URL = [URL stringByReplacingOccurrencesOfString:@" " withString:@""];
//you must then convert the path to a proper NSURL or it won't work
NSURL *xmlURL = [NSURL URLWithString:URL];
// here, for some reason you have to use NSClassFromString when trying to alloc NSXMLParser, otherwise you will get an object not found error
// this may be necessary only for the toolchain
[[NSURLCache sharedURLCache] setMemoryCapacity:0];
[[NSURLCache sharedURLCache] setDiskCapacity:0];
NSXMLNewsParser = [[NSXMLParser alloc] initWithContentsOfURL:xmlURL];
// Set self as the delegate of the parser so that it will receive the parser delegate methods callbacks.
[NSXMLNewsParser setDelegate:self];
// Depending on the XML document you're parsing, you may want to enable these features of NSXMLParser.
[NSXMLNewsParser setShouldProcessNamespaces:NO];
[NSXMLNewsParser setShouldReportNamespacePrefixes:NO];
[NSXMLNewsParser setShouldResolveExternalEntities:NO];
[NSXMLNewsParser parse];
[NSXMLNewsParser release];
}
- (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError {
NSString * errorString = [NSString stringWithFormat:@"Unable to download story feed from web site (Error code %i)", [parseError code]];
NSLog(@"error parsing XML: %@", errorString);
UIAlertView * errorAlert = [[UIAlertView alloc] initWithTitle:@"Error loading content" message:errorString delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[errorAlert show];
[errorAlert release];
[errorString release];
}
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict{
NewsCurrentElement = [elementName copy];
if ([elementName isEqualToString:NewsItemType])
{
// clear out our story item caches...
NewsItem = [[NSMutableDictionary alloc] init];
NewsCurrentElement1 = [[NSMutableString alloc] init];
NewsCurrentElement2 = [[NSMutableString alloc] init];
if(NewsNumElements == 3)
{
NewsCurrentElement3 = [[NSMutableString alloc] init];
}
}
}
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{
if ([elementName isEqualToString:NewsItemType])
{
// save values to an item, then store that item into the array...
[NewsItem setObject:NewsCurrentElement1 forKey:NewsElement1];
[NewsItem setObject:NewsCurrentElement2 forKey:NewsElement2];
if(NewsNumElements == 3)
{
[NewsItem setObject:NewsCurrentElement3 forKey:NewsElement3];
}
[newsCategories addObject:[[NewsItem copy] autorelease]];
[NewsCurrentElement release];
[NewsCurrentElement1 release];
[NewsCurrentElement2 release];
if(NewsNumElements == 3)
{
[NewsCurrentElement3 release];
}
[NewsItem release];
}
}
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
//NSLog(@"found characters: %@", string);
// save the characters for the current item...
if ([NewsCurrentElement isEqualToString:NewsElement1]) {
[NewsCurrentElement1 appendString:string];
} else if ([NewsCurrentElement isEqualToString:NewsElement2]) {
[NewsCurrentElement2 appendString:string];
} else if (NewsNumElements == 3 && [NewsCurrentElement isEqualToString:NewsElement3])
{
[NewsCurrentElement3 appendString:string];
}
}
- (void)dealloc {
[super dealloc];
[newsCategories release];
[NewsItemType release];
[NewsElement1 release];
[NewsElement2 release];
[NewsElement3 release];
}
내가 클래스의 인스턴스를 만들 때 내가 너무 좋아한다 :
NewsFeedParser *categoriesParser = [[NewsFeedParser alloc] init];
if(newsCat == 0)
{
categoriesParser.NewsItemType = @"article";
categoriesParser.NewsElement1 = @"category";
categoriesParser.NewsElement2 = @"catid";
}
else
{
categoriesParser.NewsItemType = @"article";
categoriesParser.NewsElement1 = @"category";
categoriesParser.NewsElement2 = @"feedUrl";
}
[categoriesParser parseXMLFileAtURL:feedUrl];
newsCategories = [[NSMutableArray alloc] initWithArray:categoriesParser.newsCategories copyItems:YES];
[self.tableView reloadData];
[categoriesParser release];
하는 경우 누출 도구로 앱을 실행하면 누수가 NewsFeedParser.m의 [NSXMLNewsParser parse] 호출을 가리 킵니다.
http://img139.imageshack.us/img139/3997/leaks.png
이 누수가 어디에서 오는지 내가 알아낼 수 없습니다 내 인생 : 여기
는 NSCFStrings 누출로 누출 기기의 스크린 샷이다. 어떤 도움이라도 대단히 감사하겠습니다.