I have a loop that identifies elements of a webpage via its HTML and extracts the sections I need. I'm wanting to build an array or (very) long string of the extracted text which can be used later.
The extraction uses TFHpple from GitHub. The problem seems to lie with the extracted text being a _CFNSString, and these don't allow me to transpose them into a NSString or NSMutuableArray.
The code I'm using is:
NSArray *webNodes = [webParser searchWithXPathQuery:tutorialsXpathQueryString];
NSString *extractedText = [[NSString alloc] init];
NSMutableArray *extractedArray = [[NSMutableArray alloc] initWithCapacity:0];
for (TFHppleElement *element in webNodes) {
Extraction *extraction = [[Extraction alloc] init];
[extractedArray addObject:extraction];
extraction.title = [[element firstChild] content];
extractedText = extraction.title;
NSLog(#"\n\nTitle: %#", extractedText);
}
The NSLog at this point shows me extractedText holds I'm after for each loop, breaking the code shows extractedText to be a _CFNSString.
If I try adding
text = [text StringByAppendingString extractedText];
(with 'text' being an NSString initialised before the loop) as the last step of the loop I get a null value. Its the same if I try adding text or extraction.title directly into an array.
I found this question Convert NSCFString to NSString but the conversion seems to be going the other way (NSString to CFNSString). When I added equivalent code I got bridging errors and the code doesn't run.
How can I collect the data within extraction.title to build a string or array that can be used later?
You said you only want a text.
Get it in one line of code for array:
NSArray *extractedArray = [webNodes valueForKeyPath:#"firstChild.content"];
For string:
NSString *extractedText = [webNodes valueForKeyPath:#"firstChild.content"] componentsJoinedByString:#" "];
Related
I need to pass this array to SOAP API as a parameter. The back-end guy is new to building APIs (C#/.NET) and I have never implemented this kind of API before. There are 4-5 SO question related to this. But none of them were the solution as per my query.
NSArray *arr = [NSArray arrayWithObjects:#"1",#"2", nil];
NSString *soapURL = #"http://tempuri.org/IService1/addRecord";
NSString *soapBody = [NSString stringWithFormat:#"<addRecord xmlns=\"http://tempuri.org/\">"
"<id>%#</id>"
"<title>%#</title>"
"<record>%#</record>"
"</addRecord> \n” ,#“1”,#“abc", arr ];
NSLog(#"%#",soapBody);
Error:
value in string The formatter threw an exception while trying to deserialize the message: Error in deserializing body of request message for operation 'addRecord'. End element 'record' from namespace 'http://tempuri.org/' expected. Found text '(
1,
2
)'.
One thing I came to know that I cannot pass array directly in to soapBody. What what is the alternative?
The API is working fine at the back-end.
some comments:
NSArray *arr = [NSArray arrayWithObjects:#"1",#"2", nil];
please write instead the modern form:
NSArray *arr = #[#"1",#"2"];
Also, your question is filled with wrong types of quotes (“1”). Make sure to use the regular quotes, i.e. ".
When you use "stringWithFormat" with %# and provide an array, you must understand what you are getting there. let's try:
NSArray *arr = #[#"1",#"2"];
NSString *str = [NSString stringWithFormat:#"<%#>", arr];
NSLog(#"%#", str);
The result is:
<(
1,
2
)>
It means that between your <record> and </record> you inserted two numbers separated by a comma and surrounded by parentheses, plus some \n.
Is this what your server is expecting?
So I am not solving your problem, but you must format your string the right way and verify it using your NSLog command. Hoping it is helping.
EDIT
If for example you need to provide the values of the array within <value>...</value> than you can do this:
NSArray *arr = #[#"1", #"2"];
NSMutableString *mStr = [NSMutableString string];
for (NSString *value in arr) {
[mStr appendFormat:#"<value>%#</value>", value];
}
NSLog(#"<record>%#</record>", mStr);
And the result will be
<record><value>1</value><value>2</value></record>
Finally I resolved this issue with this code:
NSString *soapBody = [NSString stringWithFormat:#"< addRecord xmlns=\"http://tempuri.org/\" xmlns:arr=\"http://schemas.microsoft.com/2003/10/Serialization/Arrays\" > \n"
"<ID>1</ID>\n"
"<title>ABC</title>\n"
"<record>\n"];
for (int i=0; i<arrRecord.count; i++) {
soapBody = [NSString stringWithFormat:#"%# <arr:int>%#</arr:int>\n",soapBody,arrRecord[i]];
}
soapBody = [NSString stringWithFormat:#"%# </record></addRecord> \n",soapBody];
I needed to define "arr" in the parent node and type of element(int) in the record array.
I need to pull out the excel file to interface that user can only read the information in file.
what is the solution to implement it?
The most easy way to solve this is first, convert the Excel file to CSV format, which stands for Comma Seperated Value. Meaning it's formatted like: cell 1,cell 2,cell 3. And a new line for each row.
The second is to read the file into a String which can be done in two ways, depending if you have it local or not. Let's say you have it on a server.
NSURL *url = [NSURL urlWithString:#"http://urltoyour.excel/file.csv"];
NSData *data = [NSData dataWithContentOfURL:url];
NSString *string = [NSString stringWithData:data];
Then you can easily convert this to arrays using
NSArray *lines = [string componentsSeparatedByCharactersInSet:[NSCharacterSet newlineCharacterSet]];
Now you have each excel line in that array. Now for each line you probably want the columns in an array too, you can do that using:
NSMutableArray *finalArray = [NSMutableArray new];
for (NSString *line in lines) {
NSArray *array = [line componentsSeperatedByString:#","];
[finalArray addObject:array];
}
Good luck and let me know if that works out for you!
I have an iPad app that links to an SQL database to retrieve information in the following way:
NSString *strGetCodeUrl = [NSString stringWithFormat:#"%#", #"http://website/getdevicecode.php?device=" , deviceName];
NSArray *deviceArray = [[NSMutableArray alloc] initWithContentsOfURL:[NSURL URLWithString:strGetCodeUrl]];
This works when there is a device that matches and it retrieves the required information. However if there is not a match it returns
("")
The array however appears to have one record. Ideally I would like to stop this from happening and for the array to be empty if there is no match. Alternatively (although not very tidy) I could check the length of the entry at index 0 but I am struggling with this method.
NSString *deviceCode = [deviceArray objectAtIndex:0];
if ( [deviceCode length] == 0)
{
device does not exist
}
Any advice gratefully received.
What about this:
NSString *deviceCode = [deviceArray objectAtIndex:0];
if ([deviceCode isEqualToString:#""])
{
device does not exist
}
I don't think you can tell the init method to leave out empty strings...
However, you can do this:
NSString *strGetCodeUrl = [NSString stringWithFormat:#"%#", #"http://website/getdevicecode.php?device=" , deviceName];
NSArray *deviceArray = [[NSMutableArray alloc] initWithContentsOfURL:[NSURL URLWithString:strGetCodeUrl]];
[deviceArray removeObject:#""];
Which also isn't as tidy as perhaps you were hoping for, but it will remove all empty strings. But at least its just 1 line of code as opposed to about 3 for the if
Per the documentation:
Removes all occurrences in the array of a given object.
This is my first question to Stack Overflow. I have been using this site for a while and have used it's resources to figure out answers to my programming questions but I'm afraid I can't find the answer I'm looking for this time.
I've created these five strings:
//List five items from the book and turn them into strings
//1 Josh the Trucker
NSString *stringJosh = #"Josh the Trucker";
//2 The Witch from the Remote Town
NSString *stringWitch = #"The Witch from the Remote Town";
//3 Accepting the curse rules "Willingly and Knowingly"
NSString *stringRules = #"Accepting the curse rules, --Willingly and Knowingly--";
//4 Josh's time left to live--Five Days Alive Permitted
NSString *stringFiveDays = #"Josh's time left to live--Five Days Alive Permitted";
//5 The Fire Demon Elelmental
NSString *stringDemon = #"The Fire Demon Elelmental";
Then, I've put them in an array:
//Create an array of five items from the book
NSArray *itemsArray = [[NSArray alloc] initWithObjects:
stringJosh,
stringWitch,
stringRules,
stringFiveDays,
stringDemon,
nil];
Then, I created this mutable string where I need to loop through the array and append the items to a UIlabel.
NSMutableString *itemsString = [[NSMutableString alloc] initWithString:
#"itemsArray"];
Here's the loop, which displays the items in the console log.
for (int i=0; i<5; i++)
{
NSLog(#"Book Item %d=%#", i, itemsArray[i]);
}
My question is, how do I append these items into the UIlabel?
These functions are in my appledelegate.
In my viewDidAppear function (flipsideViewController) I have:
label8.text =""----thats where the looped info needs to go.
How do I do this?
I feel I need to put them together and append where the NSLog should be...but how do I transfer that info to the textlabel?
I hope I explained myself.
We haven't done ANY append examples, I guess this is where I need to get answers from the "wild"
This is the wildest coding environment I know so I'm hoping I can find some direction here.
Thanks for taking a look!
Once you have all your strings that you want to concatenate in NSArray you can combine them with single call (with whatever separator you want):
NSString *combinedString = [itemsArray componentsJoinedByString:#" "];
If you need more complex logic you can use NSMutableString to create result you want while iterating array, i.e.:
NSMutableString *combinedString = [NSMutableString string];
[itemsArray enumerateObjectsUsingBlock:^(NSString *obj, NSUInteger idx, BOOL *stop) {
[combinedString appendFormat:#"Book Item %d=%# ", idx, obj];
}];
Note also that it is better to iterate through collections using fast enumeration or block enumeration rather than using plain index-based for loop.
NSMutableString *labelText = [NSMutableString string];
int i = 0;
for (NSString *item in itemsArray)
[labelText appendFormat:#"Book Item %d=%#\n", i++, item];
label8.text = labelText;
DO this
UILabel *mainlabel;
mainlabel.text = [origText stringByAppendingString:get];
Add your text to mainlabel.. orig text is mutable string or else in forloop just append array object at index text to label.put above line of code in forloop
I can't seem to append a string from arrayOne into arrayTwo. It's a very simple problem and I have Googled around and have tried different examples that I found below. Does anyone see the obvious issue here?
[_arrayTwo addObject:arrayOne[i]]; // int i
[_arrayTwo addObject:[arrayOne objectAtIndex:i]]; // int i
[_arrayTwo addObject:#"Test"]; // I can't even add a literal string
NSString *tempString = [arrayOne objectAtIndex:i];
[arrayTwo addObject:tempString];
NSLog Output:
NSLog(#"%#", _imageArray); // Result is "(null)"
Additional Notes:
arrayOne is healthy (contains NSString values)
Both arrays are NSMutableArray (declared as properties in the .h)
I believe _imageArray is nil
Try adding in
_imageArray = [[NSMutableArray alloc] init];
In your init method call.