IPhone開發中，用libxml2解析xml字串

首先添加libxml2.dylib到工程中，再匯入標頭檔，#include <libxml/xmlreader.h>

再加入如下代碼：

-(NSMutableArray*)parser:(NSString*)xmlStr{
    //解析xml
    NSData *xmlData = [xmlStr dataUsingEncoding:NSUTF8StringEncoding];
xmlTextReaderPtr reader = xmlReaderForMemory([xmlData bytes], 
                                                 [xmlData length], 
                                                 NULL, nil, 
                                                 (XML_PARSE_NOBLANKS | XML_PARSE_NOCDATA | XML_PARSE_NOERROR | XML_PARSE_NOWARNING));
if (!reader) {
NSLog(@"Failed to load xmlreader");
return;
}
NSString *currentTagName = nil;
NSDictionary *currentPerson = nil;
NSString *currentTagValue = nil;
NSMutableArray *advertiseMArray = [NSMutableArray array];
char* temp;
while (true) {
if (!xmlTextReaderRead(reader)) break;
switch (xmlTextReaderNodeType(reader)) {
case XML_READER_TYPE_ELEMENT:
// starting an element
temp =  (char*)xmlTextReaderConstName(reader);
currentTagName = [NSString stringWithCString:temp 
                                                    encoding:NSUTF8StringEncoding];
if ([currentTagName isEqualToString:@"元素資訊"]) {
currentPerson = [NSMutableDictionary dictionary];
[advertiseMArray addObject:currentPerson];
                }
                
continue;
case XML_READER_TYPE_TEXT:
//The current tag has a text value, stick it into the current 
temp = (char*)xmlTextReaderConstValue(reader);
currentTagValue = [NSString stringWithCString:temp 
                                                     encoding:NSUTF8StringEncoding];
                
                if (!currentPerson) return;
                
                [currentPerson setValue:currentTagValue forKey:currentTagName];
                currentTagValue = nil;
currentTagName = nil;                              
                
            default: continue;
}
}
    

    // NSLog(@"%@:%s Final data: %@", [self class], _cmd, advertiseMArray );
    
    return advertiseMArray;
}

這裡返回的是一個mutableArray類型的。