I am doing the following:
NSData *htmlData = [[NSString stringWithString:sHTML] dataUsingEncoding:NSUTF8StringEncoding];
TFHpple * xpathParser = [[TFHpple alloc] initWithHTMLData:htmlData];
NSArray * elements = [xpathParser searchWithXPathQuery:#"//div[#id='column2']"];
if ([elements count] > 0)
{
TFHppleElement * element = [elements objectAtIndex:0];
NSString * sHTMLResult = [element content];
...
}
But, sHTMLResult (or, [element content]) is always empty. I have tried [element raw] but that gives me a string with <!CDATA tags and carriage returns like &13. In any case, the CDATA tags is what causes my html to be invalid when I use raw.
I have done a lot of google searches but they all seem to use [element content] so I am baffled as to what is wrong and why it does not work for me?
Related
I'm diving into iOS development and I have a custom URL scheme for my iPhone app that looks like myApp://?q=200. I have the following code to get the query parameter...
NSString *urlString = [url absoluteString];
NSString *query = [urlString stringByReplacingOccurrencesOfString:#"myApp://?q=" withString:#""];
...but I'd like to make it a bit more future-proof in the event that I add more parameters. How can I extract the "q" parameter in a safer way?
Thanks in advance for your wisdom!
You can split the query returned from the URL by & and = and put them in a dictionary.
NSURL *url = [NSURL URLWithString:#"myApp://?q=200"];
NSArray *query = [[url query] componentsSeparatedByString:#"&"];
NSMutableDictionary *parameters = [NSMutableDictionary dictionaryWithCapacity:[query count]];
for(NSString *parameter in query)
{
NSArray *kv = [parameter componentsSeparatedByString:#"="];
[parameters setObject:[kv count] > 1 ? [[kv objectAtIndex:1] stringByReplacingPercentEscapesUsingEncoding:NSISOLatin1StringEncoding] : [NSNull null]
forKey:[[kv objectAtIndex:0] stringByReplacingPercentEscapesUsingEncoding:NSISOLatin1StringEncoding]];
}
NSLog(#"Parameters: %#", parameters);
NSLog(#"q = %#", [parameters objectForKey:#"q"]);
In this example if there is no value for the parameter I just set it to NSNull. This means you would either need to check for NSNull or change the logic to skip keys with values or set them to an empty string.
This from the top of my head could work but doesnt yet include error checking the input
-(NSDictionary*) parameterDictionaryFromString: (NSURL*) url {
//input can be something like: "myApp://?q=one&q2=two&q3=three"
NSString *requestString = [url query];
//now we have q=one&q2=two&q3=three
NSArray *requests = [requestString componentsSeparatedByString: #"&"];
NSMutableDictionary *resultDictionary = [NSMutableDictionary dictionary];
for (NSString *singleParameter in requests) {
NSArray *keyValuePair = [singleParameter componentsSeparatedByString: #"="];
[resultDictionary setObject: [keyValuePair objectAtIndex: 1] forKey: [keyValuePair objectAtIndex: 0]];
}
NSURL *u = [NSURL URLWithString: #"myApp://something?q=1&check=yes"];
NSLog(#"paramStr = %#", [u parameterString]);
return [resultDictionary copy];
}
Break the Query String by Distinct Separator,
Assure Valued Content provided at index:1 (The right-hand side of the query string break)
In valued content then use downstream, or set to upstream variable.
//Your Example:
//#"myApp://?q=200"
//Break:
NSArray *queryParts = [urlString componentsSeparatedByString:#"?q="];
//Assure Content:
if ([[array objectAtIndex:1] length]>0) {
//Setter:
NSString *queryString = [array objectAtIndex:1];
//... Use away...
}
The key is to leverage the NSArray class over StringReplace.
This question is for manipulating NSString in xcode.
I have a XML text string that I get from the web that looks like this
<current temperature="73" day="Mon" humidity="59" windspeed="10"></current>
How can I get individual values from this string and put them in my NSString variables?
e.g.
NSString *tempStr = ??
NSString *dayStr = ??
NSString *windspeedStr = ??
First, download and include RaptureXML within your project as described on the RaptureXML project site.
For parsing the single given line, use the following snippet - your input is passed as inXmlString;
//transform string into an XML DOM
RXMLElement *rootNode = [RXMLElement elementFromXMLString:inXmlString
withEncoding:NSUTF8StringEncoding];
if (rootNode == nil || ![rootNode isValid])
{
//do something, we failed!
}
else
{
NSString *temperature = [rootNode attribute:#"temperature"];
NSString *day = [rootNode attribute:#"day"];
NSString *windspeed = [rootNode attribute:#"windspeed"];
}
The basic idea is to use the NSString method componentsSeparatedByString: to parse out the data you want. You'll probably need to do a bit more work to get it exactly right for your scenario.
NSArray* paArray1= [pstrXMLString componentsSeparatedByString:#" "];
temlStr= [[[paArray1 objectAtIndex:1] componentsSeparatedByString:#"="] objectAtIndex:1];
dayStr= [[[paArray1 objectAtIndex:2] componentsSeparatedByString:#"="] objectAtIndex:1];
windspeedStr= [[[paArray1 objectAtIndex:3] componentsSeparatedByString:#"="] objectAtIndex:1];
the Code:
NSString *linkStr=#"http://www.voanews.com/content/obama_pledges_aid_to_drought_stricken_farmers/1484380.html";
NSData *data = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:linkStr]];
// Create parser
TFHpple *xpathParser = [[TFHpple alloc] initWithHTMLData:data];
//Get all the cells of the 2nd row of the 3rd table
NSArray *elements = [xpathParser searchWithXPathQuery:#"//p[#class='article_date']"];
// Access the first cell
if ([elements count] > 0)
{
TFHppleElement *element = [elements objectAtIndex:0];
// Get the text within the cell tag
NSString *content = [element content];
NSLog(#"VOA = %#",content); //Result : print NULL
}
[xpathParser release];
[data release];
but I use the XPath Helper query the "//p[#class='article_date']" ,it's ok, but in my code the content is null
Running your code example, if I change [element content] for [element text], my output is:
VOA = August 11, 2012
In its Github repo, they mention (at USAGE section):
[e text]; // The text inside the HTML element (the content of the
first text node)
And looking at the source code of the CONTENT method it uses objectForKey, where TFHppleContentKey = "nodeContent". See:
static NSString * const TFHppleNodeContentKey = #"nodeContent"
// Returns this tag's innerHTML content.
- (NSString *) content
{
return [node objectForKey:TFHppleNodeContentKey];
}
It seems that it's safe to use [element text] instead of [element content] in your example.
I hope it helps.
I have a data source with about 2000 lines that look like the following:
6712,Anaktuvuk Pass Airport,Anaktuvuk Pass,United States,AKP,PAKP,68.1336,-151.743,2103,-9,A
What I am interested in is the 6th section of this string so I want to turn it into an array, then i want to check the 6th section [5] for an occurrance of that string "PAKP"
Code:
NSBundle *bundle = [NSBundle mainBundle];
NSString *airportsPath = [bundle pathForResource:#"airports" ofType:#"dat"];
NSData *data = [NSData dataWithContentsOfFile:airportsPath];
NSString *dataString = [[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease];
NSArray *dataArray = [dataString componentsSeparatedByString:#"\n"];
NSRange locationOfAirport;
NSString *workingString = [[NSString alloc]initWithFormat:#""];
NSString *searchedAirport = [[NSString alloc]initWithFormat:#""];
NSString *airportData = [[NSString alloc]initWithFormat:#""];
int d;
for (d=0; d < [dataArray count]; d=d+1) {
workingString = [dataArray objectAtIndex:d];
testTextBox = workingString; //works correctly
NSArray *workingArray = [workingString componentsSeparatedByString:#","];
testTextBox2 = [workingArray objectAtIndex: 0]; //correctly displays the first section "6712"
testTextBox3 = [workingArray objectAtIndex:1] //throws exception index beyond bounds
locationOfAirport = [[workingArray objectAtIndex:5] rangeOfString:#"PAKP"];
}
the problem is that when the workingArray populates, it only populates with a single object (the first component of the string which is "6712". If i have it display the workingString, it correctly displays the entire string, but for some reason, it isn't correctly making the array using the commas.
i tried it without using the data file and it worked fine, so the problem comes from how I am importing the data.
ideas?
You code works. You should run it with the debugger to see what's happening. At a guess, your input data isn't what you think it is - possibly a different encoding, or different line endings.
See sample:
NSString *dataString = #"6712,Anaktuvuk Pass Airport,Anaktuvuk Pass,United States,AKP,PAKP,68.1336,-151.743,2103,-9,A";
NSArray *dataArray = [dataString componentsSeparatedByString:#"\n"];
for (NSString *workingString in dataArray) {
NSString *testTextBox = workingString; //works correctly
NSArray *workingArray = [workingString componentsSeparatedByString:#","];
NSString *testTextBox2 = [workingArray objectAtIndex: 0]; //correctly displays the first section "6712"
NSString *testTextBox3 = [workingArray objectAtIndex:1]; //throws exception index beyond bounds
NSRange locationOfAirport = [[workingArray objectAtIndex:5] rangeOfString:#"PAKP"];
}
there was a problem in the data where there were a few "\"s that caused the errors.
I have an string which is got from parsing an xml site.
http://www.arijasoft.com/givemesomthing.php?a=3434&b=435edsf&c=500
I want to have an NSString function that will be able to parse the value of c.
Is there a default function or do i have to write it manually.
You could use Regular expression via RegExKit Lite:
http://regexkit.sourceforge.net/RegexKitLite/
Or you could separate the string into components (which is less nice):
NSString *url=#"http://www.arijasoft.com/givemesomthing.php?a=3434&b=435edsf&c=500";
NSArray *comp1 = [url componentsSeparatedByString:#"?"];
NSString *query = [comp1 lastObject];
NSArray *queryElements = [query componentsSeparatedByString:#"&"];
for (NSString *element in queryElements) {
NSArray *keyVal = [element componentsSeparatedByString:#"="];
if (keyVal.count > 0) {
NSString *variableKey = [keyVal objectAtIndex:0];
NSString *value = (keyVal.count == 2) ? [keyVal lastObject] : nil;
}
}
I made a class that does this parsing for you using an NSScanner, as an answer to the same question a few days ago. You might find it useful.
You can easily use it like:
URLParser *parser = [[[URLParser alloc] initWithURLString:#"http://www.arijasoft.com/givemesomthing.php?a=3434&b=435edsf&c=500"] autorelease];
NSString *c = [parser valueForVariable:#"c"]; //c=500
Try the following:
NSURL *url = [NSURL URLWithString:#"http://www.arijasoft.com/givemesomthing.php?a=3434&b=435edsf&c=500"];
NSMutableString *parameterString = [NSMutableString stringWithFormat:#"{%#;}",[url parameterString]];
[parameterString replaceOccurrencesOfString:#"&" withString:#";"];
// Convert string into Dictionary
NSPropertyListFormat format;
NSString *error;
NSDictionary *paramDict = [NSPropertyListSerialization propertyListFromData:[parameterString dataUsingEncoding:NSUTF8StringEncoding] mutabilityOption: NSPropertyListImmutable format:&format errorDescription:&error];
// Now take the parameter you want
NSString *value = [paramDict valueForKey:#"c"];
Here is the native iOS approach using NSURLComponents and NSURLQueryItem classes:
NSString *theURLString = #"http://www.arijasoft.com/givemesomthing.php?a=3434&b=435edsf&c=500";
NSArray<NSURLQueryItem *> *theQueryItemsArray = [NSURLComponents componentsWithString:theURLString].queryItems;
for (NSURLQueryItem *theQueryItem in theQueryItemsArray)
{
NSLog(#"%# %#", theQueryItem.name, theQueryItem.value);
}