Creating substrings from text file - objective-c

Question

I have a text file that contains two lines of numbers, all I want to do is turn each line into a string, then add it into an array (called fields). My problem arrises when trying to find the EOF character. I can read from the file with no problem: I turn it's content into a NSString, then pass to this method.
-(void)parseString:(NSString *)inputString{
NSLog(#"[parseString] *inputString: %#", inputString);
//the end of the previous line, this is also the start of the next lien
int endOfPreviousLine = 0;
//count of how many characters we've gone through
int charCount = 0;
//while we havent gone through every character
while(charCount <= [inputString length]){
NSLog(#"[parseString] while loop count %i", charCount);
//if its an end of line character or end of file
if([inputString characterAtIndex:charCount] == '\n' || [inputString characterAtIndex:charCount] == '\0'){
//add a substring into the array
[fields addObject:[inputString substringWithRange:NSMakeRange(endOfPreviousLine, charCount)]];
NSLog(#"[parseString] string added into array: %#", [inputString substringWithRange:NSMakeRange(endOfPreviousLine, charCount)]);
//set the endOfPreviousLine to the current char count, this is where the next string will start from
endOfPreviousLine = charCount+1;
}
charCount++;
}
NSLog(#"[parseString] exited while. endOfPrevious: %i, charCount: %i", endOfPreviousLine, charCount);
}
The contents of my text file look like this:
123
456
I can get the first string (123) no problem. The call would be:
[fields addObject:[inputString substringWithRange:NSMakeRange(0, 3)]];
Next, I make the call for the second String:
[fields addObject:[inputString substringWithRange:NSMakeRange(4, 7)]];
But I get an error, and I think it is because my index is out of bounds. Since the index starts from 0, there is no index 7 (well I think its supposed to be the EOF character), and I get an error.
To sum everything up: I don't know how to deal with an index of 7 when there are only 6 characters + the EOF character.
Thanks.

Answer 1

You can use componentsSeparatedByCharactersInSet: to get the effect that you are looking for:
-(NSArray*)parseString:(NSString *)inputString {
return [inputString componentsSeparatedByCharactersInSet:[NSCharacterSet newlineCharacterSet]];
}

Answer 2

Short answer is to use [inputString componentsSeparatedByString:#"\n"] and get the array of numbers.
Example:
Use the following code to get the lines in an array
NSString *path = [[NSBundle bundleForClass:[self class]] pathForResource:#"aaa" ofType:#"txt"];
NSString *str = [[NSString alloc] initWithContentsOfFile: path];
NSArray *lines = [str componentsSeparatedByString:#"\n"];
NSLog(#"str = %#", str);
NSLog(#"lines = %#", lines);
The above code assumes that you have a file called "aaa.txt" in your resources which is plain text file.