我正在尝试使用touchXML库解析xml但没有得到结果，代码如下
NSError *error = nil;
CXMLDocument *xmlParser = [[CXMLDocument alloc] initWithXMLString:dataString options:0 error:&error];
NSArray *resultNodes = NULL;
resultNodes = [xmlParser nodesForXPath:@"//entry" error:&error];
for (CXMLElement *resultElement in resultNodes) {
NSMutableDictionary *blogItem = [[NSMutableDictionary alloc] init];
int counter;
for(counter = 0; counter < [resultElement childCount]; counter++) {
[blogItem setObject:[[resultElement childAtIndex:counter] stringValue] forKey:[[resultElement childAtIndex:counter] name]];
}
}
方法nodesForXPath：不返回任何离开带有0个对象的resultNodes数组的东西。我在dataString中获取了正确的xml，并且CXMLDocument也正在准备中。我试过调试它但是我没有看到接受resultNodes中的0个对象，NSError也没有任何内容（即没有错误发生）。我试图解析的xml文件如下所示。
<feed xmlns:s="http://syndication.nhschoices.nhs.uk/services" xmlns="http://www.w3.org/2005/Atom">
<title type="text">...</title>
<id>...</id>
<rights type="text">© Crown Copyright 2009</rights>
<updated>2012-04-27T11:33:02+01:00</updated>
<category term="Search"/>
<logo>...</logo>
<author>...</author>
<s:SearchCoords>174900,517900</s:SearchCoords>
<entry>
<id>
http://v1.syndication.nhschoices.nhs.uk/organisations/gppractices/32248
</id>
<title type="text">Sayer A</title>
<updated>2012-04-27T10:33:02Z</updated>
<link rel="self" title="Sayer A" href="http://v1.syndication.nhschoices.nhs.uk/organisations/gppractices/32248?apikey=YAHUGHET"/>
<link rel="alternate" title="Sayer A" href="http://www.nhs.uk/ServiceDirectories/Pages/GP.aspx?pid=15F37AEF-EC5B-4A90-9E72-269ADEB39629"/>
<content type="application/xml">
<s:organisationSummary>
<s:name>Sayer A</s:name>
<s:address>
<s:addressLine>The Richmond Green Medical Cen</s:addressLine>
<s:addressLine>19 The Green</s:addressLine>
<s:addressLine>Richmond</s:addressLine>
<s:addressLine>Surrey</s:addressLine>
<s:postcode>TW91PX</s:postcode>
</s:address>
<s:contact type="General">
<s:telephone>020 83327515</s:telephone>
</s:contact>
<s:geographicCoordinates>
<s:northing>174900</s:northing>
<s:easting>517800</s:easting>
<s:longitude>-0.305512266736965</s:longitude>
<s:latitude>51.4608026642546</s:latitude>
</s:geographicCoordinates>
<s:Distance>0.1</s:Distance>
</s:organisationSummary>
</content>
</entry>
<entry>
<id>
http://v1.syndication.nhschoices.nhs.uk/organisations/gppractices/33420
</id>
<title type="text">Griffiths W</title>
<updated>2012-04-27T10:33:02Z</updated>
<link rel="self" title="Griffiths W" href="http://v1.syndication.nhschoices.nhs.uk/organisations/gppractices/33420?apikey=YAHUGHET"/>
<link rel="alternate" title="Griffiths W" href="http://www.nhs.uk/ServiceDirectories/Pages/GP.aspx?pid=EEC98A8A-B888-4F44-A0B6-DC6ABCBF19CE"/>
<content type="application/xml">
<s:organisationSummary>
<s:name>Griffiths W</s:name>
<s:address>
<s:addressLine>Paradise Road Surgery</s:addressLine>
<s:addressLine>37 Paradise Road</s:addressLine>
<s:addressLine>Richmond</s:addressLine>
<s:addressLine>Surrey</s:addressLine>
<s:postcode>TW91SA</s:postcode>
</s:address>
<s:contact type="General">
<s:telephone>020 89402423</s:telephone>
</s:contact>
<s:geographicCoordinates>
<s:northing>174800</s:northing>
<s:easting>518100</s:easting>
<s:longitude>-0.301388352909701</s:longitude>
<s:latitude>51.4601120315006</s:latitude>
</s:geographicCoordinates>
<s:Distance>0.223606797749979</s:Distance>
</s:organisationSummary>
</content>
</entry>
<entry>
<id>
http://v1.syndication.nhschoices.nhs.uk/organisations/gppractices/33035
</id>
<title type="text">Dr Da Costa</title>
<updated>2012-04-27T10:33:02Z</updated>
<link rel="self" title="Dr Da Costa" href="http://v1.syndication.nhschoices.nhs.uk/organisations/gppractices/33035?apikey=YAHUGHET"/>
<link rel="alternate" title="Dr Da Costa" href="http://www.nhs.uk/ServiceDirectories/Pages/GP.aspx?pid=EDCE215D-6412-4AAB-AFC4-9F37888D413C"/>
<content type="application/xml">
<s:organisationSummary>
<s:name>Dr Da Costa</s:name>
<s:address>
<s:addressLine>The Vineyard Surgery</s:addressLine>
<s:addressLine>35 The Vineyard</s:addressLine>
<s:addressLine>Richmond</s:addressLine>
<s:addressLine>Surrey</s:addressLine>
<s:postcode>TW106PP</s:postcode>
</s:address>
<s:contact type="General">
<s:telephone>020 89480404</s:telephone>
</s:contact>
<s:geographicCoordinates>
<s:northing>174600</s:northing>
<s:easting>518100</s:easting>
<s:longitude>-0.301044685875553</s:longitude>
<s:latitude>51.4581333717098</s:latitude>
</s:geographicCoordinates>
<s:Distance>0.360555127546399</s:Distance>
</s:organisationSummary>
</content>
</entry>
答案 0 :(得分：1)
看看这个，我能够解析类似的回复：
- (void)viewDidLoad
{
[super viewDidLoad];
self.rqst=[[WebRqst alloc] init];
[self.rqst startLoading:[NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"PASS UR URL"]]
vCtr:self];
}
**// a method to grab the attributes.**
- (void)parseAttributesForElement:(CXMLElement*)element andDictionary:(NSMutableDictionary*)dictionary {
NSString *strName,*strValue;
NSArray *arAttributes = [(CXMLElement*)element attributes];
for (int i=0; i<arAttributes.count; i++) {
strName = [[arAttributes objectAtIndex:i] name];
strValue = [[arAttributes objectAtIndex:i] stringValue];
if(strName && strValue && [strName length]>0 && [strValue length]>0) {
[dictionary setValue:strValue forKey:strName];
}
}
}
**// a method to parse the node & store in dictionary**
- (void)parseThisNode:(CXMLNode*)node storeInDictionary:(NSMutableDictionary*)dOfNode {
NSString *strName = [node name];
NSString *strValue = [node stringValue];
if(strName && [strName length]>0 && ![strName isEqualToString:@"text"]) {
NSMutableDictionary *dOfAttributes = [NSMutableDictionary dictionary];
// if node has value
if(strValue && [strValue length]>0) {
[dOfAttributes setValue:strValue forKey:@"value"];
}
// if node has attributes
if([node isKindOfClass:[CXMLElement class]] && [(CXMLElement*)node attributes].count>0) {
[self parseAttributesForElement:(CXMLElement*)node andDictionary:dOfAttributes];
}
// if node has childs
NSArray *arChildern = [node children];
if(arChildern.count>0) {
NSMutableDictionary *dOfTAG=[NSMutableDictionary dictionary];
for (CXMLNode *nodeChildChild in arChildern) {
// recursive call of a function
[self parseThisNode:nodeChildChild storeInDictionary:dOfTAG];
}
if([[dOfTAG allKeys] count]>0) [dOfAttributes setValue:dOfTAG forKey:@"child"];
}
id valueFK = [dOfNode valueForKey:strName];
// verify if same node is repeated, add it to array (e.g. link tag is repeated )
if([valueFK isKindOfClass:[NSMutableArray class]]) {
NSMutableArray *ar=(NSMutableArray*)valueFK;
[ar addObject:dOfAttributes];
[dOfNode setValue:ar forKey:strName];
} else if([valueFK isKindOfClass:[NSMutableDictionary class]]) {
NSMutableArray *ar=[NSMutableArray arrayWithObjects:valueFK,dOfAttributes, nil];
[dOfNode setValue:ar forKey:strName];
} else {
[dOfNode setValue:dOfAttributes forKey:strName];
}
}
}
**// pass the data to this method & it will return a dictionary**
- (NSDictionary *)startParsingUsingData:(NSData *) data {
// create a mutable-empty dictionary wich will hold the data
NSMutableDictionary *dictionaryParsed = [NSMutableDictionary dictionary];
// verify - do we have proper data for parsing or not
if(data && [data length]>0) {
// load a data into XML Document
CXMLDocument *doc = [[CXMLDocument alloc] initWithData:data options:0 error:nil];
// grab all the tags of XML
NSArray *nodes = [doc nodesForXPath:@"*" error:nil];
// start a loop to goThrough each tag of xml
for (CXMLNode *nodeFeed in nodes) {
// verify that you reached to desired tag or not
if([[nodeFeed name] isEqualToString:@"feed"]) {
// just write this code to get data parsed & stored in our dictionary
[self parseThisNode:nodeFeed storeInDictionary:dictionaryParsed];
// grab the childrens of tag ( as per requirement )
dictionaryParsed=[[dictionaryParsed valueForKey:@"feed"] valueForKey:@"child"];
}
}
}
// return the dictionary.
if([[dictionaryParsed allKeys]count]>0) {
return [NSDictionary dictionaryWithDictionary:dictionaryParsed];
} else {
return nil;
}
}
// It's my delegate method where I am getting my NSData
- (void)webRequestReceivedData:(NSData *)data {
if(data && [data length]>0) {
NSLog(@"Details are as follows\n%@",
[self startParsingUsingData:data]); //This is the method required which will parse the data
}
}
希望，现在您将能够解析数据。
答案 1 :(得分：1)
我从未使用过touchXML，但可能需要设置命名空间，例如：Getting the value of an Element in Cocoa using TouchXML