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我正在通过 NSXMLParser 进行 XML 解析。但是当谈到 NSXMLParser 的 didendElement 时，它有时会崩溃并有时会给出结果。我不明白我哪里出错了？

 arr3=[[NSMutableArray alloc] init];
    drr3=[[NSMutableDictionary alloc]init];

    NSURL *urlString2= [NSString stringWithFormat:@"http://www.XXX.YYY/services/SService.svc/Get"];
  currentURL=@"1";
/// calling the service url and getting the repsnse in array (arr3)

if([arr3 count]==0)
{
 currentURL=@"2";
    //calling another service url and storing in arr3.
}

    - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict {
    if(currentURL==@"1")
{
        if([elementName isEqualToString:@"PWList"])
        {
            arr3=[[NSMutableArray alloc] init];
            drr3=[[NSMutableDictionary alloc] init];

        }
        if([elementName isEqualToString:@"Name"])
        { 

            drr3=[[NSMutableDictionary alloc] init];        
        }
        srr3=[[NSMutableString alloc] init]; 

}
if(currentURL==@"2")
{
      if([elementName isEqualToString:@"WeeksList"])
          {
              arr3=[[NSMutableArray alloc] init];


          }
          if([elementName isEqualToString:@"Person"])
          {

              drr3=[[NSMutableDictionary alloc]init];
          }

          srr3=[[NSMutableString alloc] init];
    }
}
    - (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName {
if(curentURL==@"1")
{

   //some code 
     if([elementName isEqualToString:@"PWList"])
        {

            [drr3 release],drr3=nil;
        }
}
if(curentURL==@"2")
{     
if([elementName isEqualToString:@"Code"])
            {

                [drr3 setObject:srr3 forKey:@"Code"]; //crashes at this line
                [srr3 release],srr3=nil;
                return;
            }
    }
}

当涉及到[drr3 setObject:srr3 forKey:@"Code"];给我错误“__NSDictionaryM setObject:forKey:]: message sent to deallocated instance".

有时我确实得到了结果。

我能做些什么来摆脱这个错误？

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