I've looked around a bit and tried a few things, but none have really worked. What I'm trying to do is create a NSArray of NSStrings, with each array value corresponding to one line from the Rich Text File I'm referencing. At first I tried this:
NSArray* data = [[NSString stringWithContentsOfFile:#"relevantFile.rtf" encoding:4 error:nil] componentsSeparatedByCharactersInSet: [NSCharacterSet newlineCharacterSet]];
I've also tried this, because I found it in the iOS developer library:
NSArray* data = [[NSArray alloc] initWithContentsOfFile:#"relevantFile.rtf"];
However, neither of these has worked for me. A few lines later in the code, in order to diagnose errors, I have the following code:
for(int i = 0; i < [data count]; i++)
{
NSLog(#"%#", [data objectAtIndex: i]);
}
...for which NSLog is printing "(null)". I'm not entirely sure what I'm doing wrong here -- should I be using mutable strings or arrays, or is there some better way to go about this that I don't know about?
That first line you posted should do it. My guess would be that it's not finding the file. Not specifying an absolute path, the app will look in the current directory which is probably NOT where the file is.
If the file is a resource that is compiled into your app bundle, you can use the following code to obtain the path to it:
NSString* path = [[NSBundle mainBundle] pathForResource: #"relevantFile" ofType: #"rtf"]
NSArray* data = [[NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil] componentsSeparatedByCharactersInSet: [NSCharacterSet newlineCharacterSet]];
Related
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'm trying to retrieve content of a csv file to NSString. Thats what I do:
NSString *strBundle = [[NSBundle mainBundle] pathForResource:#"socs" ofType:#"csv"];
NSLog(#"bundle path: %#",strBundle);
NSString *file = [NSString stringWithContentsOfFile:strBundle
encoding:NSUTF8StringEncoding
error:nil];
if ([[NSFileManager defaultManager]fileExistsAtPath:strBundle]) {
NSLog(#"file is there!!!");
}else {
NSLog(#"no file");
}
NSLog(#"file: %#",file);
NSArray *allLines = [file componentsSeparatedByCharactersInSet:[NSCharacterSet newlineCharacterSet]];
NSLog(#"lines: %lu",(unsigned long)[allLines count]);
file manager shows that the file is there. When i try to log the NSString or number of files it says null. I even created NSData object with the content of exactly the same file and when I logged the NSData object, I clearly saw that there is some data. Then when I tried to create NSString with the content of NSData, I had the same result as before - null. Maybe the problem is somewhere in the formatting of the file?
Any help will be appreciated :)
I see 3 issues:
You are passing a nil argument to the error: parameter in your stringWithContentsOfFile: line. If there's a possibility something might go wrong (and apparently there is), you should pass a real argument there so you can figure out what went wrong.
You can use componentsSeparatedByCharactersInSet:[NSCharacterSet newlineCharacterSet], but that has a tendency to produce blank "components" between every line. Plain old #"\n" works better in virtually all cases I've run into.
You should be checking fileExistsAtPath before you try to load it into the NSString
If you were truly able to create an NSData object from the path it doesn't necessarily mean it's correct data. But let's say it is, if you were not able to convert it to a NSString then you need to check your encoding parameter.
I have a Text file and it has lot of lines How can i get last 'n' number of lines from the text file? and Can we give Numbers in the text file for each file How can we get it.
You could use NSFileHandle, seekToEndOfFile and then work backwards from the offsetInFile using seekToFileOffset: and readDataOfLength: scanning the data read each time for carriage returns and counting them until you get to the required number. As you go you can build up the text after each scan.
One way is putting \n to separate your different lines in the text file. Then
NSString* path = [[NSBundle mainBundle] pathForResource:#"filename"
ofType:#"txt"];
NSString* content = [NSString stringWithContentsOfFile:path
encoding:NSUTF8StringEncoding
error:NULL];
NSArray* lines = [content componentsSeparatedByString: #"\n"];
Then you can take the last few elements in the array.
Hope this helps..
Try to use this one:
NSString* textFile = [[NSBundle mainBundle]
pathForResource:#"fileName" ofType:#"txt"];
NSString* fileContents = [NSString stringWithContentsOfFile: textFile
encoding: NSUTF8StringEncoding error: nil];
Separate by new line
NSArray* allLinedStrings =
[fileContents componentsSeparatedByCharactersInSet:
[NSCharacterSet newlineCharacterSet]];
Here you can get your last 100 objects
NSString* oneLineStr;
for (int i = allLinedStrings.count - 100; i < allLinedStrings.count; i++)
{
oneLineStr = [allLinedStrings objectAtIndex: i];
NSLog#("New Line %#", oneLineStr);
}
Getting a warning saying that:
Collection expression type 'NSString *' may not respond to 'countByEnumeratingWithState:objects:count'
when trying to run the following code:
NSString *proper = [NSString stringWithContentsOfFile:#"usr/share/dict/propernames" encoding:NSUTF8StringEncoding error:NULL];
for (NSString *i in proper){
NSLog(#"Item>%#", i);
}
When I run the program I don't get any output from the NSLog statement. Anyone run into this?
The compiler warning is trying to tell you that you cannot iterate over an NSString using a for ... in ... loop. It is further trying to say than the reason for this is that an NSString is not a valid "Collection" type. Your valid "Collection" types are things like NSArray, NSSet, and NSDictionary.
So if your file is supposed to contain structured data, you should parse it into something more useful than a flat NSString. Something like this may give a better result:
NSString* temp = [NSString stringWithContentsOfFile:#"usr/share/dict/propernames" encoding:NSUTF8StringEncoding error:NULL];
NSArray* proper = [temp componentsSeparatedByString:#"\n"];
for (NSString* i in proper){
NSLog(#"Item>%#", i);
}
That will print each line in the file. This assumes, of course, that your input file has one entry per line. If it is structured some other way, then you will have to parse it differently.
After you load the file, split it into lines with componentsSeparatedByString: .
NSArray *lines = [proper componentsSeparatedByString:#"\n"]; // Use the correct line ending character here
for (NSString *i in lines) {
NSLog(#"item> %#", i);
}
This is a clear mistake u have here.
NSString* is a string object and is not a collection of characters as the string object known in C++ which is a character array.
for-in Loop need a collection to iterate within. like NSArray or NSSet.
I create a NSArray and write to a file: a.plist.
I use NSString: initWithContentsOfFile, and I can see the content in xml.
Then, I add a.plist to another project
and then I use NSString: initWithContentsOfFile to get the xml string.
filePath = [[NSBundle mainBundle] pathForResource:#"a" ofType:#"plist"];
NSString *plistStr = [[NSString alloc]initWithContentsOfFile:filePath];
However, it failed to recreate the xml string.
I user NSArray to test:
NSArray *plist2Array = [[NSArray alloc]initWithContentsOfFile:filePath];
But it successfully.
I think it may result from "Text Encoding" when I add it to another project.
The problem is I tried UTF8,UTF16 and so on.
I still can't find solution.
Hope for your help,thanks!
I find it!
rename the file: a.plist ->a.txt(or any else),
then in another project you can get the xml string.