無法使用NSXmlParser獲取數據

Question

我正在使用NSXmlParser從XML獲取數據。在解析器委託方法我：

- (void)resetPassCallback: (NSData*) data{ 
     NSLog(@"start parsing the data"); 
     NSXMLParser *nsXmlParser = [[NSXMLParser alloc] initWithData:data]; 
     [nsXmlParser setDelegate:self]; 
     BOOL success = [nsXmlParser parse]; 
     if (success) { 
      NSLog(@"No errors %@", xmlArray); 
     } else { 
      NSLog(@"Error parsing document!"); 
     } 
} 

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *) namespaceURI qualifiedName:(NSString *)qualifiedName attributes: (NSDictionary *)attributeDict 
{ 
     element = elementName; 
     if([elementName isEqualToString:@"User"]) 
     { 
     XmlDict = [[NSMutableDictionary alloc]init]; 
     userId =[[NSMutableString alloc]init]; 
     screenName =[[NSMutableString alloc]init]; 
     xmlArray = [[NSMutableArray alloc]init]; 
} 

}

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string { 
    NSLog(@"foundCharacters ::::: %@ :::: ", string); 
    [xmlArray addObject:string]; 
} 

雖然我能夠分析數據，我沒有得到完整的數據。在控制檯上，日誌顯示：

foundCharacters ::::: 200 :::: 
foundCharacters ::::: f1f47453-04d7-20c8-a9e1-406fdc89a2da :::: 
foundCharacters ::::: test :::: 
foundCharacters ::::: 62e2092a-eb6e-44ad-7a7b-3deb976569c1 :::: 
foundCharacters ::::: Thomas :::: 
xmlArray contents : (
"62e2092a-eb6e-44ad-7a7b-3deb976569c1", 
Thomas 
) 

正如你可以看到，爲什麼我沒有得到在xmlArray「測試」和其他值。

Answer 1

我希望Array的代碼在每次NSXMLParser時都會重新發起。

您需要在調用NSXMLParser delegates 之前初始化陣列。

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *) namespaceURI qualifiedName:(NSString *)qualifiedName attributes: (NSDictionary *)attributeDict 
{ 
    //Don't initialise your NSArray here 
    } 
} 

-(void) parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{ 
    NSLog(@"foundCharacters ::::: %@ :::: ", string); 
    [xmlArray addObject:string]; 
} 

Answer 2

使用xmlArray = [[NSMutableArray alloc]init];在

- (void)resetPassCallback: (NSData*) data{ 
    NSLog(@"start parsing the data"); 
    xmlArray = [[NSMutableArray alloc]init]; 
    NSXMLParser *nsXmlParser = [[NSXMLParser alloc] initWithData:data]; 
    [nsXmlParser setDelegate:self]; 
    BOOL success = [nsXmlParser parse]; 
    if (success) { 
     NSLog(@"No errors %@", xmlArray); 
    } else { 
     NSLog(@"Error parsing document!"); 
    } 
} 

不

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *) namespaceURI qualifiedName:(NSString *)qualifiedName attributes: (NSDictionary *)attributeDict 
{ 

} 

Answer 3

爲什麼使用mutableArray。簡單地嘗試這個

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string { 

     if(!currentElementValue) 
       currentElementValue = [[NSMutableString alloc] initWithString:string]; 
     else 
       [currentElementValue appendString:string]; 

     NSLog(@"Processing Value: %@", currentElementValue); 

}