Sorry, that does not compile with Swift 3. First of all, the expression
"(count:BUFSIZE, repeatedValue:CChar(0))" must be written as
"(repeating:CChar(0), count:BUFSIZE)", Note that the order within the
expression is significant (don't ask me why, it just is. Ask the
language designers).
Second, print line causes the compiler to disgorge the following:
" error: 'fromCString' is unavailable: Please use
String.init?(validatingUTF8:) instead. Note that it no longer accepts
NULL as a valid input. Also consider using String(cString:), that will
attempt to repair ill-formed code units.
print(String.fromCString(buf)!, terminator:"")
^~~~~~~~~~~
Swift.String:4:24: note: 'fromCString' has been explicitly marked
unavailable here
public static func fromCString(_ cs: UnsafePointer<CChar>) ->
String?
"
I frankly don't know how to parse that compiler output, since it is NOT
like Swift 2.2, and is apparently trying to explain that in some
tortured form of syntax. I don't know how to map that response into
working code.
On 2016-05-28 18:54, TUNG CK wrote:
Same as Linux 2.2
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:"")
}
}
Ken Burgett via swift-users <swift-users@swift.org> 於 29 May 2016 2:05
AM 寫道：
Hi all,
I am trying to understand how Swift 3 File I/O works in a linux
environment. I put together a trivial test program using what I
can glean from the few examples I can find. See below.
===============================
import Glibc
import Foundation
let filename = Process.arguments[1]
let file_handle = fopen (filename, "r")
let BUFSIZE = 1024
var buf = [CChar](repeating:CChar(0), count:BUFSIZE)
while fgets(&buf, Int32(BUFSIZE), file_handle) != nil
{
print(buf)
}
exit(0)
===============================
The program runs, but produces a stream of integer arrays, each of
1024 bytes. I can see what appears to be ASCII character values in
the sample text, plus a lot of trailing zeros. I suspect I haven't
mapped the bytes in buf to Strings, so how should that be done?
--
Ken Burgett
Principal Software Engineer
Email: k...@iotone.io
Office: 530.693.4449
Mobile: 831.332.6846
URL: www.iotone.co
<main.swift>
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--
Ken Burgett
Principal Software Engineer
Email: k...@iotone.io
Office: 530.693.4449
Mobile: 831.332.6846
URL: www.iotone.co
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