I am working with very large JSON files, so I do not want to read the entire file and then iterate and parse each data entry.
Instead, I would like to iterate on the JSON file itself (for example: line-by-line/one object at a time).
I thought about holding the next line location as part of the current line data, so the JSON is a semi linked list, but I did not manage to extract a specific line from the JSON file.
Am I missing an easier way to achieve that? Is it even possible to extract and parse a specific line from a JSON file?
Thanks a lot!
JSON is not a line oriented format, so the idea of parsing "line by line" doesn't really make sense.
That said, there is at least one event-driven JSON parser for iOS that I know of, https://github.com/stig/json-framework. The built-in parser NSJSONSerialization only works on entire files.
Related
if you take this basic comma separated input:
replace,something,incsvfile
Can you use xslt to convert the file i.e. make each value a row for example or replace the word 'replace' with 'replaced'.
Can you point me to a reference link that may help me to learn how to do this please?
The reason for the question is I'm working with an application that can output csv files, and you can apply xslt (2.0) to the output but I dont know how to convert csv into another csv output to post process it and I cannot work out how to do this.
Any help would be appreciated.
I am currently trying to build an iOS game that match word with its definition for myself and my classmates.
I'm having a hard time thinking how do I go about converting a list of words with their definitions in a .docx files into something(JSON, XML, ...) that I can then read it into an Array or Dictionary.
Most of the words in the .docx have the following format:
" Word (): Definition. "
This would be easier with excel. Excel already has the function to export to xml, and should make your life a lot easier, instead of getting all the words out of docx and then converting them to either JSON or XML.
http://www.excel-easy.com/examples/xml.html
I am working with a huge JSON object and i need to extract a single parameter from it.
Is there a way to query the JSON object for the parameter?
You need a streaming JSON parser for that, i.e. a parser that produces events to which you listen as it goes through the JSON input, as opposed to document-based parsers, such as NSJSONSerialization of iOS 5+.
One of such parsers is YAJL: although it is a C library, you can use it from Objective C as well: all you need to do is defining a yajl_callbacks, put pointers to the handlers for the type of the item that you wish to extract, call the parser, and let the parser do the rest.
I've unicode character text for indian language(telugu) like this
పురాణాలు
I'm getting the above text from database to an xml file format. I'm reading the xml file and
when i am printing the text it is showing as పురాణాలు
Is there any way print the text as it is without any encoded character type &#...?
How are you parsing the XML? A proper XML parser should decode the numeric references.
I'm guessing that you are attempting to hand parse an XML document instead of relying on NSXMLParser. If so, you really should use an XML parser. Bad Guess on my part, it's likely that the entities are being double encoded.
To answer your question directly, Objective C HTML escape/unescape shows how to decode entities with a quick and dirty method.
I'm trying to figure out how to read in the contents of an XLS document and I'm able to get the bytes just fine, but I don't have any clue where to go from here. Trying [[NSString alloc] initWithBytes:data.bytes length:data.length encoding:NSUTF8StringEncoding] and [NSString stringWithUTF8String:data.bytes] both don't get me anywhere (null). What are you supposed to do to read in the contents of an XLS file?
Trying to combine two answer.
"There is no innate ability to read Excel data into a Foundation container, like an NSArray or NSDictionary. You could, however, convert the file (with Excel) to a comma-separated-value (CSV) file and then parse each line's cells on the iPhone using the NSString instance method -componentsSeparatedByString:."
"A comma-separated values (CSV) file stores tabular data (numbers and text) in plain-text form. Plain text means that the file is a sequence of characters, with no data that has to be interpreted instead, as binary numbers. A CSV file consists of any number of records, separated by line breaks of some kind; each record consists of fields, separated by some other character or string, most commonly a literal TAB or comma. Usually, all records have an identical sequence of fields"
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How to read cell data from an Excel document with objective-c
objective-c loading data from excel
Even though saving your Excel file to CSV is the easier answer, sometimes that's not really what you're looking for, so I created QZXLSReader. It's a drag-and-drop solution so it's a lot easier to use. I don't think it's as feature complete, but it worked for me.
It's basically a library that can open XLS files and parse them into Obj-C classes. Once you have the classes, it's very easy to send them to Core Data or a dictionary or what have you.
I hope it helps!