[英]Memory leak while parsing XML using TouchXML
我正在使用TouchXML解析XML。 当我在“配置文件”模式下运行相同的文件时。 我可以看到内存泄漏。 如何解决此问题?
-(NSMutableArray *) grabXML:(NSData *)xmlData andQuery:(NSString *)query {
NSMutableArray *blogEntries = [[[NSMutableArray alloc] init] autorelease];
CXMLDocument *rssParser = [[[CXMLDocument alloc] initWithData:xmlData options:0 error:nil] autorelease];
NSArray *resultNodes = [rssParser nodesForXPath:query error:nil];
for (CXMLElement *resultElement in resultNodes) {
NSMutableDictionary *blogItem = [[NSMutableDictionary alloc] init];
int counter;
for(counter = 0; counter < [resultElement childCount]; counter++) {
[blogItem setObject:[[resultElement childAtIndex:counter] stringValue] forKey:[[resultElement childAtIndex:counter] name]];
}
for( int i = 0; i < [[resultElement attributes] count]; i++) {
CXMLNode *node = [[resultElement attributes] objectAtIndex:i];
[blogItem setObject:[[resultElement attributeForName:[node name]] stringValue] forKey:[node name]];
}
[blogEntries addObject:[blogItem copy]];
[blogItem release];
}
return [blogEntries copy];
}
我以下面提到的格式调用上述方法。
NSMutableArray *arr = [[self grabXML:responseData andQuery:@"//wsCheneliereResult"] autorelease];
[blogEntries addObject:[blogItem copy]];
这是您的错误:您无需复制blogItem
, addObject:
实际上将retain
其参数,以便您可以安全地调用[blogItem release];
之后。
而且,您很可能也不应该return [blogEntries copy]
,而仅返回blogEntries
:这是一种常见的编程习惯,即名称不包含“ copy”或“ create”的方法返回自动释放的值,例如您不需要释放当您完成对它们的操作时。
综上所述,我将选择:
-(NSMutableArray *) grabXML:(NSData *)xmlData andQuery:(NSString *)query {
NSMutableArray *blogEntries = [[[NSMutableArray alloc] init] autorelease];
CXMLDocument *rssParser = [[[CXMLDocument alloc] initWithData:xmlData options:0 error:nil] autorelease];
NSArray *resultNodes = [rssParser nodesForXPath:query error:nil];
for (CXMLElement *resultElement in resultNodes) {
NSMutableDictionary *blogItem = [[NSMutableDictionary alloc] init];
int counter;
for(counter = 0; counter < [resultElement childCount]; counter++) {
[blogItem setObject:[[resultElement childAtIndex:counter] stringValue] forKey:[[resultElement childAtIndex:counter] name]];
}
for( int i = 0; i < [[resultElement attributes] count]; i++) {
CXMLNode *node = [[resultElement attributes] objectAtIndex:i];
[blogItem setObject:[[resultElement attributeForName:[node name]] stringValue] forKey:[node name]];
}
[blogEntries addObject:blogItem];
[blogItem release];
}
return blogEntries;
}
和
NSMutableArray *arr = [self grabXML:responseData andQuery:@"//wsCheneliereResult"];
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.