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Hi I have a csv file and I would like to parse the information there on an array so I can use it on a map. Heres is what I have from the parsing part:

NSString *filepath = [[NSBundle mainBundle] pathForResource:@"Geolocalizadas" ofType:@"csv"];
NSString *content =  [NSString stringWithContentsOfFile:filepath  encoding:NSUTF8StringEncoding error:nil];
NSLog(@"array: %@", content);
NSArray *arrayfarm = [content componentsSeparatedByString:@"\n"];
for (NSString *item in arrayfarm) {
    NSArray *itemArray = [item componentsSeparatedByString:@","];
    // log first item
    NSLog(@"%@",[itemArray objectAtIndex:0]);
}

I use the nslog onthe content and array and always get (null)

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If "content" is null/empty then your file access is mucked up. Make use of "error" to find out what may be going wrong. –  Hot Licks May 31 '13 at 1:08
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2 Answers

up vote 2 down vote

I see two potential problems with your program.

  1. 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.

  2. You're using @"\r" to separate strings in the file. That's weird on a Mac (which I guess you're using since this question is about an Objective-C program), though I guess possible. You might want that to be @"\n". Or @"\r\n", I guess, if it's a DOS format file.

I made just a change for #2 above and ran your program with a test file and it seems to work fine - meaning your problem is likely with #1. It can't find the file, can't open it because of a permissions problem, or something along those lines.

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Yeah, 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. –  Hot Licks May 31 '13 at 1:07
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up vote 0 down vote

You have to pass the full path of the file to NSString stringWithContentsOfFile:encoding:error:, not just a filename.

Where is this CSV file? Is it in the app bundle? The Documents folder? Create the full path based on its location.

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the CSV file is on the supporting files I modify the code but still cant get it working –  darkjuso May 30 '13 at 23:17
 
Try getting rid of the inDirectory: part of the pathForResource: call. Most likely the file is in the root of the resource bundle. –  rmaddy May 30 '13 at 23:42
 
try that but still shows as null, aslo try a txt file but it couldn't find it –  darkjuso May 31 '13 at 0:08
 
What does "pathForResource" return? –  Hot Licks May 31 '13 at 1:31
 
(Are you sure your file is in the bundle? Find the emulator storage in Finder and see if the file is there.) –  Hot Licks May 31 '13 at 1:32
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