CSV file to string

Asked Aug 15 '17 at 02:38

Active Aug 15 '17 at 02:43

Viewed 27 times

I am trying to turn a CSV file into a string to parse it and am getting very confused by the errors. The code I am using is this:

let filename = Bundle.main.path(forResource: "BaseballSimStats", ofType: "CSV")
var text = String()
do {
    text = try String(contentsOfFile: filename!, encoding: String.Encoding.utf8)
} catch {
     print("File Read Error for file \(filename!)")
}
print(text)

I am getting an error saying that the execution was interrupted because a bad instruction and that it was unexpectedly found nil while unwrapping an Optional value. This made sense because I am using filename! but when I change it to a ? I get the following error:

Playground execution failed: error: MyPlayground.playground:1:47: error: value of optional type 'String?' not unwrapped; did you mean to use '!' or '?'?
text = try String(contentsOfFile: filename?, encoding: String.Encoding.utf8)
                                          ^
                                  (        )!

This is telling me to fix it by adding the !, but I get the previous error when I do that. What am I doing wrong? Thanks in advance!

edited Aug 15 '17 at 02:43

rmaddy

314,917
42
532
579

asked Aug 15 '17 at 02:38

StefWG

`filename` is `nil` which means you have no such file in your app's bundle. – rmaddy Aug 15 '17 at 02:43
other than that it is fine? because there is a file called `BaseballSimStats.csv` in the bundle – StefWG Aug 15 '17 at 02:46
`BaseballSimStats.csv` is not the same as `BaseballSimStats.CSV`. Case matters. And you should safely unwrap `filename`. Avoid using `!`. – rmaddy Aug 15 '17 at 02:49
But when I don't use it, it tells me to use it. – StefWG Aug 15 '17 at 02:53
That's why you need to safely unwrap it. Read the duplicate and its answers I linked. And read all about optionals in the Swift book. – rmaddy Aug 15 '17 at 02:54
I'm understanding the mistake, `filename` is returning nil. Any ideas why? – StefWG Aug 15 '17 at 03:01
I told you why in my very first comment. – rmaddy Aug 15 '17 at 03:02
Would it make a difference if it is in a playground inside my file? – StefWG Aug 15 '17 at 03:04
You should use `Bundle.main.url(forResource: ..., withExtension: ...)` – Eric Aya Aug 15 '17 at 12:07

CSV file to string

0 Answers0