Question

我是iPhone开发的新手。我想像这样解析XML文件以获取属性值。

   <Root>
         <element att_1 ="value1" att_2 ="value2" />
         <element att_1 ="value1" att_2 ="value2" />
                             .
                             .
                             .

   <Root/>

通常是XML文件

   <element att="..."> content <element/>

我在didEndElement上使用它

   if([elementName isEqualToString:@"element"]){

   // Do something

   }

如何查看空标签？请告诉我。谢谢。

抱歉我的英语不好。

=============================================== ======================

现在我遇到了新问题。当我运行应用程序（模拟器）时它会卡住并在didStartElement中显示消息“Thread1：Stopped at breakpoint”。我想我做错了。

StudyList.xml

    <StudyList>
           <study description="20040311181130" modsInStudy="" pat_birth="19760822" pat_id="47-3450" pat_name="Ekachai Chaichanasiri" refPhy="" study_date="Sun Jan 11 00:03:00 ICT 2004"  study_id="696122224" study_iuid="1.2.392.200036.9123.100.200.20040311181130"/>
           <study description="XoranCAT Study" modsInStudy="" pat_birth="19821117" pat_id="63" pat_name="Wantana Areeprayolkij" refPhy="" study_date="Fri Jan 28 00:04:00 ICT 2005" study_id="" study_iuid="1.2.826.0.1.3680043.2.594.4041.16900.9840.32723.30648"/>
    </StudyList>

代表

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


    if ([elementName isEqualToString:@"StudyList"]) {
    //Initialize the array.
    appDelegate.studyList = [[NSMutableArray alloc] init];
    } else if ([elementName isEqualToString:@"study"]) {
    //Initialize the study.
    aStudy.patientBrith = [attributeDict objectForKey:@"pat_birth"] ;
    aStudy.patientID = [attributeDict objectForKey:@"pat_id"];
    aStudy.patientName = [attributeDict objectForKey:@"pat_name"];
    aStudy.studyDate = [attributeDict objectForKey:@"study_date"];


    NSLog(@"Patient name: %@",aStudy.patientName);
    NSLog(@"Patient ID: %@",aStudy.patientID);
    NSLog(@"Patient Birth: %@" ,aStudy.patientBrith);
    NSLog(@"Study Date: %@" ,aStudy.studyDate);

        }
    NSLog(@"Process Element");
    }
    -(void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{
    //Nothing to do because XML file dose not have text node

    }

    -(void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName  namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{

    //End if XML file nothing to do.
    if ([elementName isEqualToString:@"StudyList"]) {
    return;

    //Add study object in to array and release the object.

    if ([elementName isEqualToString:@""]||elementName == nil) {
        [appDelegate.studyList addObject:aStudy];
          }
        }
    }

NSLog（@“患者姓名：％@”，aStudy.patientName）;

NSLog（@“患者ID：％@”，aStudy.patientID）;

NSLog（@“患者出生：％@”，aStudy.patientBrith）;

NSLog（@“研究日期：％@”，aStudy.studyDate）;

***上面的输出为空。怎么了，请以正确的方式告诉我。

Answer 1

在此函数中保留字符串的值

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

- (void) parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName 检查

if ([retainedString isEqualToString:@"" ] || [retainString == nil)

然后该值为空。

如何在iPhone上检查带有空标签的end元素？

1 个答案: