I, I'm writing an application that has to read the content of txt.
this txt is such a property file with a list formatted in this way:
1|Chapter 1|30
2|Chapter AA|7
3|Story of the United States|13
........
keys are separated by "|".
I googled a lot hoping to find any "pragmatically solution" but nothing...
how can I read these informations and set many objects like:
for NSInterger *nChapter = the first element
for NSString *title = the second element
for NSInteger *nOfPages = the last element ?
NSString's - (NSArray *)componentsSeparatedByString:(NSString *)separator could be your best friend.
https://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSString_Class/Reference/NSString.html#//apple_ref/doc/uid/20000154-componentsSeparatedByString_
Only if you read NSString's class reference:
NSString *str = [NSString stringWithContentsOfFile:#"file.txt"];
NSArray *rows = [str componentsSeparatedByString:#"\n"];
for (NSString *row in rows)
{
NSArray *fields = [row componentsSeparatedByString:#"|"];
NSInteger nChapter = [[fields objectAtIndex:0] intValue];
NSString *title = [fields objectAtIndex:1];
// process them in here
}
Related
i have a string like 112.1 or 102.2 etc now i want to get the substring before dot and after the dot using objective c, means i want to get 2 substrings like this 112 and 1. please guide. Regards Saad.
Try the following:
NSArray *arrayWithTwoStrings = [yourString componentsSeparatedByString:#"."];
Using this method you'll get NSArray containing string components that were separated by "." string, that is "112" and "1" for "112.1" string. After that you can access them using array's objectAtIndex: method.
P.S. Note also that if you're going to use numeric values of those strings there might be better solution
NSString *str = yourstr;
NSArray *Array = [str componentsSeparatedByString:#"."];
NSString *t = [Array objectAtIndex:0];
NSString *t1 = [Array objectAtindex:1];
NSArray* components = [yourString componentsSeparatedByString:#"."];
All,
I have a dictionary with two keys and values. I need to extract bits and pieces from them and place them into seperate strings.
{
IP = "192.168.17.1";
desc = "VUWI-VUWI-ABC_Dry_Cleaning-R12-01";
}
That is what the dictionary looks like when I call description.
I want the new output to be like this:
NSString *IP = #"192.168.17.1";
NSString *desc = #"ABC Dry Cleaning"; //note: I need to get rid of the underscores
NSString *type = #"R";
NSString *num = #"12";
NSString *ident = #"01";
How would I achieve this?
I've read through the Apple developer docs on NSRegularExpression but I find it hard to understand. I'm sure once I get some help once here I can figure it out in the future, I just need to get started.
Thanks in advance.
Okay, so first, you have to get the object associated with each key:
NSString *ip = [dic objectForKey:#"IP"]; //Btw, you shouldn't start a variable's name with a capital letter.
NSString *tempDesc = [dic objectForKey:#"desc"];
Then, what I would do is split the string in tempDesc, based on the character -.
NSArray *tmpArray = [tempDesc componentsSeparatedByString:#"-"];
Then you just have to get the strings or substrings you're interested in, and reformat them as needed:
NSString *desc = [[tmpArray objectAtIndex:2] stringByReplacingOccurrencesOfString:#"_" withString:#" "];
NSString *type = [[tmpArray objectAtIndex:3] substringToIndex:1];
NSString *num = [[tmpArray objectAtIndex:3] substringFromIndex:1];
NSString *ident = [tmpArray objectAtIndex:4];
As you can see, this works perfectly without using NSRegularExpression.
Hi all i want extract the last part from string which is a four digit number '03276' i:e http://www.abc.com/news/read/welcome-new-gig/03276
how can i do that.
You can also use
NSString *sub = [#"http://www.abc.com/news/read/welcome-new-gig/03276" lastPathComponent];
If you know how many characters you need, you can do something like this:
NSString *string = #"http://www.abc.com/news/read/welcome-new-gig/03276";
NSString *subString = [string substringFromIndex:[string length] - 5];
If you just know that it's the part after the last slash, you can do this:
NSString *string = #"http://www.abc.com/news/read/welcome-new-gig/03276";
NSString *subString = [[string componentsSeparatedByString:#"/"] lastObject];
Since *nix uses the same path separators as URL's this will be valid as well.
[#"http://www.abc.com/news/read/welcome-new-gig/03276" lastPathComponent]
If you know the length of the number, and it's not gonna change, it can be as easy as:
NSString *result = [string substringFromIndex:[string length] - 4];
If the last part of the string is always the same length (5 characters) you could use this method to extract the last part:
- (NSString *)substringFromIndex:(NSUInteger)anIndex
Use the length of the string to determine the start index.
Something like this:
NSString *inputStr = #"http://www.abc.com/news/read/welcome-new-gig/03276";
NSString *newStr = [inputStr substringFromIndex:[inputStr length]-5];
NSLog(#"These are the last five characters of the string: %#", newStr);
(Code not tested)
NSString *str = #"http://www.abc.com/news/read/welcome-new-gig/03276";
NSArray *arr = [str componentSeparatedBy:#"gig/"];
NSString *strSubStringDigNum = [arr objectAtIndex:1];
strSubStringDigNum will have the value 03276
Try this:
NSString *myUrl = #"http://www.abc.com/news/read/welcome-new-gig/03276";
NSString *number = [[myUrl componentsSeparatedByString:#"/"] objectAtIndex: 5];
i have to create an 2images and 3 labels by using code (cgrectmake)and i am having X location, y location, width and height all are stored in arrays(which i have retrieved from the web services)how can i create the image and labels can any one help me
You can join the elements of an array together with the NSString componentsJoinedByString class method:
NSString myString = [myNSArray componentsJoinedByString:#"x"];
where x is the characters you'd like to appear between each array element.
Edited to add
So in your newly-added code if these are the label values:
lbl = #"zero"
lbl1 = #"one"
lbl2 = #"two"
and you want to join them together with a space character then if you did this:
NSString *temp = [labelArray componentsJoinedByString:#" "];
NSLog(#"temp = %#", temp);
then this is what would be logged:
zero one two
Edited to further add
If you are instead trying to join the label values together to make xml elements then you might do something like this:
NSString *joinedElements = [labelArray componentsJoinedByString:#"</label><label>"];
NSString *temp = [NSString stringWithFormat:#"<label>%#</label>", joinedElements];
NSLog(#"temp = %#", temp);
then this is what would be logged:
<label>zero</label><label>one</label><label>two</label>
may be this is usefull to you.
NSString *str;
str = [arrayName objectAtIndex:i(Index NO)];
OK by this easily you can access object from the array. any type of object u can fetch this way only reception object type are change in left side.
Best of Luck.
Most objects have a -description method which returns a string representation of the object:
- (NSString *)description;
For example:
NSArray *array = [NSArray arrayWithObjects:#"The", #"quick", #"brown", #"fox", nil];
NSLog(#"%#", array); // prints the contents of the array out to the console.
NSString *arrayDescription = [array description]; // a string
It would help to know what you want to do with the string (how will you use the string). Also, what kind of objects do you have in the array?
In that case, Matthew's answer is one possibility. Another might be to use an NSMutableString and append the individual items, if you need control over how the string is created:
NSMutableString *string = [NSMutableString string];
if ([array count] >= 3) {
[string appendString:[array objectAtIndex:0]];
[string appendFormat:#"blah some filler text %#", [array objectAtIndex:1]];
[string appendString:[array objectAtIndex:2]];
}
i have the text in a string as shown below
011597464952,01521545545,454545474,454545444|Hello this is were the message is.
Basically i would like each of the numbers in different strings to the message eg
NSString *Number1 = 011597464952
NSString *Number2 = 01521545545
etc
etc
NSString *Message = Hello this is were the message is.
i would like to have that split out from one string that contains it all
I would use -[NSString componentsSeparatedByString]:
NSString *str = #"011597464952,01521545545,454545474,454545444|Hello this is were the message is.";
NSArray *firstSplit = [str componentsSeparatedByString:#"|"];
NSAssert(firstSplit.count == 2, #"Oops! Parsed string had more than one |, no message or no numbers.");
NSString *msg = [firstSplit lastObject];
NSArray *numbers = [[firstSplit objectAtIndex:0] componentsSepratedByString:#","];
// print out the numbers (as strings)
for(NSString *currentNumberString in numbers) {
NSLog(#"Number: %#", currentNumberString);
}
Look at NSString componentsSeparatedByString or one of the similar APIs.
If this is a known fixed set of results, you can then take the resulting array and use it something like:
NSString *number1 = [array objectAtIndex:0];
NSString *number2 = [array objectAtIndex:1];
...
If it is variable, look at the NSArray APIs and the objectEnumerator option.
NSMutableArray *strings = [[#"011597464952,01521545545,454545474,454545444|Hello this is were the message is." componentsSeparatedByCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:#",|"]] mutableCopy];
NString *message = [[strings lastObject] copy];
[strings removeLastObject];
// strings now contains just the number strings
// do what you need to do strings and message
....
[strings release];
[message release];
does objective-c have strtok()?
The strtok function splits a string into substrings based on a set of delimiters.
Each subsequent call gives the next substring.
substr = strtok(original, ",|");
while (substr!=NULL)
{
output[i++]=substr;
substr=strtok(NULL, ",|")
}
Here's a handy function I use:
///Return an ARRAY containing the exploded chunk of strings
///#author: khayrattee
///#uri: http://7php.com
+(NSArray*)explodeString:(NSString*)stringToBeExploded WithDelimiter:(NSString*)delimiter
{
return [stringToBeExploded componentsSeparatedByString: delimiter];
}