Swift 2.2 Linux - open file for reading

Question

(editied to show Swift 1 and Swift 2 code)

I'm trying to read a small text file using Swift 2.2 on Linux (December 22 snapshot).
Mint 14.04 and Ubuntu 15.10 produce identical results.
If there is any way to read from a text file, please answer.

Swift 2 source:

let text = String.stringWithContentsOfFile(path, encoding: NSUTF8StringEncoding, error: nil) print(text)

error:

prefix.swift:18:13: error: type 'String' has no member 'stringWithContentsOfFile' let text = String.stringWithContentsOfFile(path, encoding: NSUTF8StringEncoding, error: nil) ^~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~

Swift 1 source:

import Foundation let text = NSString(contentsOfFile: "foo.txt", encoding: NSASCIIStringEncoding, error: nil) print(text)

error:

prefix.swift:14:12: error: argument labels '(contentsOfFile:, encoding:, error:)' do not match any available overloads let text = NSString(contentsOfFile: "foo.txt", encoding: NSASCIIStringEncoding, error: nil) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ prefix.swift:14:12: note: overloads for 'NSString' exist with these partially matching parameter lists: (charactersNoCopy: UnsafeMutablePointer<unichar>, length: Int, freeWhenDone: Bool), (format: String, locale: AnyObject?, arguments: CVaListPointer), (bytes: UnsafePointer<Void>, length: Int, encoding: UInt) var text = NSString(contentsOfFile: "foo.txt", encoding: NSASCIIStringEncoding, error: nil) ^

Mr Beardsley · Accepted Answer · 2015-12-15 18:25:18Z

2

NSString is not fully implemented yet for the cross platform version of the Foundation framework. You can track the status of the various parts of Foundation here: Foundation Status

answered Dec 15, 2015 at 18:25

Mr Beardsley

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3 Comments

Chris Koknat Over a year ago

Is it possible to read a file into a string with the current code?

Mr Beardsley Over a year ago

NSData is listed as mostly implemented. You could try NSData(contentsOfFile: String), but then you'd still need NSString to get the bytes of the NSData object into a string.

Chris Koknat Over a year ago

I tried using NSData. Same problem - contentsOfFile is not implemented

CK TUNG · Accepted Answer · 2016-04-13 09:00:38Z

It is also possible to use Glibc function like this

import Glibc let path = "./sample.txt" let BUFSIZE = 1024 let fp = fopen(path, "r") if fp != nil { var buf = [CChar](count:BUFSIZE, repeatedValue:CChar(0)) while fgets(&buf, Int32(BUFSIZE), fp) != nil { print(String.fromCString(buf)!, terminator:"") } }

user5958256 · Accepted Answer · 2016-04-09 08:26:07Z

0

try this in Linux Swift 2.2 (January 11, 2016 snapshot with Foundation module) https://swift.org/download/#older-snapshots

import Foundation ... let path = "./sample.txt" if let text = try? NSString(contentsOfFile: path as String, encoding: NSUTF8StringEncoding).bridge() { // use .bridge() to convert to String, see https://github.com/apple/swift-corelibs-foundation/blob/master/Docs/Issues.md#known-issues print(text) }

edited Apr 9, 2016 at 8:26

answered Mar 30, 2016 at 15:38

user5958256

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3 Comments

Chris Koknat Over a year ago

It looks like Swift 2.2 does not include Foundation, but it will appear in Swift 3.0. The following page shows how to compile a pre-release, which involves building Swift from source. github.com/apple/swift-corelibs-foundation/blob/master/Docs/…

Chris Koknat Over a year ago

I installed the latest snapshot, and still see the same error. swift-2.2.1-SNAPSHOT-2016-03-28-a-ubuntu14.04/usr/bin/swift

user5958256 Over a year ago

swift 2.2 Linux January 11, 2016 snapshot has Foundation module

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