的NSXMLParser问题

Question

我一直在争夺这个问题了几天，觉得我已经找到了问题...

我使用的是ASIHTTPRequest方法连接到我的PHP脚本，从数据库中调用请求数据时，从那里我启动NSXMLParser委托一切似乎工作正常，我甚至可以NSLog结果，因为他们得到解析但是，似乎当我尝试将这些结果放入一个NSMutableArray结果似乎不想进入它..我保持空值..

我希望有人可以给我一个理由为什么或如果你能指出我终于解决这个问题，因为它成为一个真正的痛苦在后面..

这是我的分析过程

- (IBAction)setRequestString:(NSString *)string 
{ 
    //set up address 
    NSMutableString *databaseURL = [[NSMutableString alloc] initWithString:@"http://127.0.0.1:8888/CodeTest/"]; 
    [databaseURL appendString:string]; 
    //call delegates 
    NSURL *url = [NSURL URLWithString:databaseURL]; //LIVE mode 
    ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:url]; 
    [request setDelegate:self]; 
    [request startAsynchronous]; 
} 

- (void)requestFinished:(ASIHTTPRequest *)request 
{  
    NSString *responseString = [request responseString]; //Pass request text from server over to NSString 
    NSData *capturedResponseData = [responseString dataUsingEncoding:NSUTF8StringEncoding]; 
    NSLog(@"%@", responseString); 
    [self startTheParsingProcess:capturedResponseData]; 
} 

- (void)requestFailed:(ASIHTTPRequest *)request 
{ 
    NSError *error = [request error]; 
    NSLog(@"%@", error); 
} 





#pragma mark - Parsing lifecycle 
//--- Start parsing process using NSXMLParser ---------------->> 
- (void)startTheParsingProcess:(NSData *)parserData 
{ 
    NSXMLParser *parser = [[NSXMLParser alloc] initWithData:parserData]; //incoming parserDatapassed to NSXMLParser delegate which starts parsing process 

    [parser setDelegate:self]; 
    [parser parse]; //Starts the event-driven parsing operation. 
    [parser release]; 

    [self.tableView reloadData]; 

} 

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict 
{ 
    if ([elementName isEqual:@"item"]) { 
     // NSLog(@"Found title!"); 
     itemString = [[NSMutableString alloc] init]; 
    } 
} 

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string 
{ 
    [itemString appendString:string]; 
} 

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName 
{ 
    if ([elementName isEqual:@"item"]) { 
     //NSLog(@"ended title: %@", itemString); 
     [myDataArray addObject:itemString]; 
     NSLog(@"%@", itemString); 
     NSLog(@"%@", myDataArray); 

     //TODO: Test release on memory consumption etc 
     [itemString release]; 
     itemString = nil; 
    } 
} 
//--- Finish parsing process using NSXMLParser ---------------->> 

它打印此

2011-09-08 08:46:24.424 iCode[1209:207] <?xml version="1.0"?> 
<entries> 
     <item>Honda</item> 
     <item>Nissan</item> 
     <item>Mitsubishi</item> 
     <item>Toyota</item> 
     <item>Mazda</item> 
</entries> 
2011-09-08 08:46:24.426 iCode[1209:207] Honda 
2011-09-08 08:46:24.426 iCode[1209:207] (null) 
2011-09-08 08:46:24.427 iCode[1209:207] Nissan 
2011-09-08 08:46:24.427 iCode[1209:207] (null) 
2011-09-08 08:46:24.428 iCode[1209:207] Mitsubishi 
2011-09-08 08:46:24.428 iCode[1209:207] (null) 
2011-09-08 08:46:24.430 iCode[1209:207] Toyota 
2011-09-08 08:46:24.431 iCode[1209:207] (null) 
2011-09-08 08:46:24.431 iCode[1209:207] Mazda 
2011-09-08 08:46:24.432 iCode[1209:207] (null) 

Answer 1

你的myDataArray是nil，你只需要在startTheParsingProcess:之类的地方分配它。

例子：

- (void)startTheParsingProcess:(NSData *)parserData 
{ 
    //You could release and create a new array like this example 
    //or check if nil, and if nil create the array else remove all objects. 
    [myDataArray release]; 
    myDataArray = [[NSMutableArray alloc] init]; 

    NSXMLParser *parser = [[NSXMLParser alloc] initWithData:parserData]; //incoming parserDatapassed to NSXMLParser delegate which starts parsing process 

    [parser setDelegate:self]; 
    [parser parse]; //Starts the event-driven parsing operation. 
    [parser release]; 

    [self.tableView reloadData]; 
} 

Answer 2

我想你会发现，你的伊娃myDataArray为零。这是因为你从未初始化它。