i want to get data from xml parser ?
how can i get from xml parser ?
which methods for that and how can i get that ?
any example for that
http://codesofa.com/blog/archive/2008/07/23/make-nsxmlparser-your-friend.html
Have a look at this..
NSXMLParser calls your "delegate", which has to implement certain methods. When the parser calls your delegate, you grab the data at that time.
For my simple xml file, I just implement the main "Element" one, which only recognizes <place lat="number" lon="number"... , and starts like this...
- (void)parser:(NSXMLParser *)parser
didStartElement:(NSString *)elementName
namespaceURI:(NSString *)namespaceURI
qualifiedName:(NSString *)qName
attributes:(NSDictionary *)attributeDict
{
// we here recognize our one crucial element, "place", and its attributes.
if([elementName compare:#"place"] == 0)
{
OmWayPoint p = {0};
p.lat = [[attributeDict valueForKey:#"lat"] doubleValue];
p.lon = [[attributeDict valueForKey:#"lon"] doubleValue];
p.alt = [[attributeDict valueForKey:#"alt"] doubleValue];
int wpCount = [self addWayPoint:&p];
...
}
Related
I want to set string "EMPTY"for empty tag XML in NSXMLParse. Exm: my xml:
<STATE>0</STATE>
<MEMO/>
In above XML, MEMO tag is empty. I want to when NSXMLParse parse into tag, if it is empty,get string "EMPTY" in label. I used bellow code to parse xml:
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName attributes:(NSDictionary *)attributeDict
{
NSLog(#"Did start element");
if ( [elementName isEqualToString:#"FILENAME"])
{
XML_FIELD = FILENAME_CLOUD2;
NSLog(#"found rootElement");
return;
}
else if ( [elementName isEqualToString:#"MEMO"])
{
NSLog(#"found rootElement");
XML_FIELD = MEMO;
return;
}
}
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
{
NSLog(#"Did end element");
if ([elementName isEqualToString:#"FILENAME"])
{
NSLog(#"rootelement end");
}
[strMemoEmpty setString:#"EMPTY"];
XML_FIELD = UNIMPORTANT2;
}
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
//NSString *tagName = #"USER_NAME";
if (XML_FIELD == FILENAME_CLOUD2)
{
NSLog(#"Value %#",string);
[FileCompletedArray insertObject:string atIndex:0];
}
else if (XML_FIELD == MEMO)
{
NSLog(#"Value %#",string);
if (string != nil) {
[strMemoEmpty setString:#""];
[strMemoEmpty appendString: string];
NSLog(#"foundResults: %#",strMemoEmpty);
}
[MemoArray insertObject:string atIndex:0];
}
}
I used above code but it not check MEMO tag is empty. It missed when parse. Do you have any suggestions? Thanks in advance
The construction of your code is a bit strange and messy, you should reorganise so:
didStartElement creates new storage for the starting element and sets any flags
foundCharacters doesn't have logic, it just appends the received string to a mutable buffer (it could be called multiple times for the same tag)
didEndElement contains the logic (and checks the length of the found characters and substitutes your empty value if required)
The way you have it now means that partial data may be saved in foundCharacters and, because that method isn't called for empty tags, some of your logic is being set but never actually saved.
iam developing one application.In that iam using the xml parsing.That xml file contain the 4 category tags and other tags.From the xml file i want to get the data of category tag.At the time of getting the category data,every time i print the array of category values.That show correctly.But after completion of parsing, another tag data will be append to last category name.My parsing code is like below.
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
if(self.presentvalue)
{
[presentvalue appendString:string];
}
}
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
{
if(![elementName compare:#"category"])
{
[categories addObject:presentvalue];
NSLog(#"%#",presentvalue);
NSLog(#"Number of elements %#",categories);
}
}
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict
{
if([elementName isEqualToString:#"category"])
{
presentvalue=[NSMutableString string];
}
}
And my xml file content is like
<lesson>
<categories>
<category id="1">1</category>
<category id="2">2</category>
<category id="3">3</category>
</categories>
<references>
<reference id="1" type="youtube" categoryid="2" name="Boyles law">
<url><![CDATA[http://www.youtube.com/watch?v=J_I8Y-i4Axc]]>
</url>
</reference>
</references>
</lesson>
From this xml i got the array values like 1,2,3http://www.youtube.com/watch?v=J_I8Y-i4Axc.Like this i got the result.So please tell me how to get the category values without that extra data.
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict
{
if ([elementName isEqualToString:#"category"]) {
NSLog(#"Node is found correctly");
if(presentvalue == nil)
presentvalue = [NSMutableString string];
else
[presentvalue setString:#""];
}
else {
presentvalue = nil;
}
}
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
[presentvalue appendString:string];
if (presentvalue)
{
[self.tempArray addObject:presentvalue]; // add this line. create a tempArray containing all the strings.
presentvalue = nil;
}
}
this should help u in your parsing. hope it helps. happy coding :)
place check in your xml parsing code. that if the starting/ending element name is category. add objects to array else do nothing. just passout
I think this line look strange
if(![elementName compare:#"category"])
Shouldn't it be like this? (without !)
if([elementName compare:#"category"])
edited
Try replacing this to the didEndElement
if([elementName isEqualToString:#"category"])
{
[categories addObject:presentvalue];
presentValue = [NSMutableString string];
NSLog(#"%#",presentvalue);
NSLog(#"Number of elements %#",categories);
}
How can I such type of Response of XML, using NSXMLParser, I am confused about two "clicks", it will hit, so how to manage flow and save data with one object, help me out,
</campaign_summary_response>
<summary> <clicks>6</clicks>
<conversions>1</conversions>
<conversion_rate>0.1666666666666666666666666667</conversion_rate>
<revenue>22.26555000000000</revenue>
<revenue_converted>22.26555000000000</revenue_converted>
<currency_symbol>$</currency_symbol>
<currency_symbol_converted>$</currency_symbol_converted>
</summary>
<campaigns>
<campaign> <offer_id>100</offer_id>
<offer_name>$100 Wendy's Gift Card + Free Frosty</offer_name>
<campaign_id>1781</campaign_id> <vertical_name>Free Stuff</vertical_name>
<price_format>CPA</price_format>
<price>0.0000</price>
<impressions>0</impressions>
<clicks>6</clicks>
<conversions>1</conversions>
<conversion_rate>0.1666666666666666666</conversion_rate>
<revenue>15.0000</revenue>
<revenue_converted>22.26555000000000</revenue_converted>
<epc>2.50000000000000000000000</epc>
<currency_symbol>€</currency_symbol>
<currency_symbol_converted>$</currency_symbol_converted>
</campaign> </campaigns>
</campaign_summary_response>
How do I code following delegate method
- (void)parser:(NSXMLParser *)parser
didEndElement:(NSString *)elementName
namespaceURI:(NSString *)namespaceURI
qualifiedName:(NSString *)qName {
So that i can save all values in one object and show on display.
In didStartElement method.
if([elementName isEqualToString:#"summary"]) summary = YES;
if([elementName isEqualToString:#"campaign"]) campaign = YES;
In didEndElement method.
if(summary) {
if([elementName isEqualToString:#"revenue"]) // revenue in summary
if([elementName isEqualToString:#"summary"]) summary = NO;
}
if(campaign) {
if([elementName isEqualToString:#"revenue"]) // revenue in campaign
if([elementName isEqualToString:#"campaign"]) campaign = NO;
}
I am using NSXMLParser to parse this XML: http://itunes.apple.com/gb/rss/topsongs/limit=50/explicit=true/xml. I am trying to parse an element called "im:image". My problem is that there are three elements with the name "im:image". How can I only parse the data from the second "im:image", or how can I add each single one to an array?
This is probably not the best way to do it, but when something like this happened to me I simply created a NSInteger named counter. Then in didStartElement I did this: (I was looking for the second element in my case)
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName
namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName
attributes:(NSDictionary *)attributeDict {
if([elementName isEqualToString:#"yweather:forecast"])
{
int code = [[attributeDict objectForKey:#"code"] intValue];
if (counter == 0) {
}
if (counter == 1) {
conditionCode = code;
}
counter ++;
}
}
In the didStartElement method of your custom delegate, check attributes and ensure that it has height set to 60 (each of the 'same' XML elements has a different height attribute). The attributes is an NSDictionary with keys for name of the attributes and values for values of the attributes. Here is an example of roughly how you would do it:
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName attributes:(NSDictionary *)attributeDict {
if ([[attributeDict objectForKey:#"height"] isEqualToString:#"60"]) {
NSLog(#"store");
}
}
I am new to iphone development.I am parsing an XML page and displaying the content in a tableview.In some block in the XML page , the child element is missing , i want to add a value o in my array, when the child element is not fond in the particular block.My XML file is like
<entry>
<id>xxx </id>
<title>xxxxx</title>
<gd:ratings numRaters="2"/>
</entry> ..................................>first block
<entry>
<id>xxx </id>
<title>xxxxx</title>
</entry> ....................................>Second block
<entry>
<id>xxx </id>
<title>xxxxx</title>
<gd:ratings numRaters="2"/>
</entry> .....................................>Third block
I am parsing the gd:ratings tag and display its attribute numRates value in a tableview. I am having an mutable array which stores the value of numRates.I have to add object "O" in the array when the second block is parsed because it doesnot contain gd:ratings tag.Since the value is present in a attribute tag, for retrieving the content and adding it to the mutable array is done in NSXML parser DidStartElement method.
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict{
currentElement = [elementName copy];
if ([elementName isEqualToString:#"entry"]) {
entry = [[NSMutableDictionary alloc] init];
currentTitle = [[NSMutableString alloc] init];
currentDate = [[NSMutableString alloc] init];
NSLog(#"inside image1 ");
}else if([elementName isEqualToString:#"media:thumbnail"])
{ currentImage = [[NSMutableString alloc] init];
if(myUrl == nil){
myUrl = [NSString stringWithString:[attributeDict objectForKey:#"url"]];
}
[currentImage appendString:myUrl];
[stories1 addObject:currentImage];
myUrl=nil;
} else if([elementName isEqualToString:#"gd:rating"])
{
currentRating=[[NSMutableString alloc]init];
myRatings=[NSString stringWithString:[attributeDict objectForKey:#"numRaters"]];
[currentRating appendString:myRatings];
[stories2 addObject:currentRating];
}
}
Since there are 25 blocks of entry tags and in that 10 block doesnot have gd rating element .So the array stories2 array has only 15 values.So i cannot display it in the tableview in order.Is there any way out to retrieve the attribute tag in "found characters" method . Please help me out.Thanks.
You can use the didEndElement method: when the outer element ended, check if the child element was added to the array.
You could use an iVar BOOL entryHasRating and do the following:
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict{
currentElement = [elementName copy];
if ([elementName isEqualToString:#"entry"]) {
entryHasRating = NO;
...
} else if ([elementName isEqualToString:#"gd:rating"]){
entryHasRating = YES;
...
}
}
Then when an element ends:
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName {
if ([elementName isEqualToString:#"entry"]&& !entryHasRating) {
[stories2 addObject:#"No Rating"];
entryHasRating = YES;
}
...
}
If you know all of the data fields that you'll be expecting, you could build a dictionary with placeholders for all of your expected values before you parse the XML; as you parse the XML just replace the placeholders with real values.