convert a single c char to string in swift

Question

I am trying to user MailCore2 (Objective C) in my Swift project.

At the moment I try to retrieve all IMAP Folders from a server (so far that works) and to split the paths by the delimiter.

INBOX.Sent
INBOX.Drafts

to

INBOX
 > Sent
 > Drafts

The Class MCOIMAPFolder has the property delimiter which is a char. If I try to print this or use it to split the paths:

print("\(folder.delimiter)\n")
var components = folder.path.componentsSeparatedByString(String.init(folder.delimiter))
for component in components {
    print("\(component)\n")
}

it will print

46
INBOX.Sent

The closest I could find here was Converting a C char array to a String but this only seems to apply to char[] and not a single char.

So what am I missing?

The question you linked to doesn't have the [c] tag... Do you wonder why? — autistic
– autistic, Commented Aug 16, 2015 at 8:35
@Freenode-newbostonSebivor To be honest, I don't. :-/ Obviously I am blind for the obvious answer... — dasmaximum
– dasmaximum, Commented Aug 16, 2015 at 8:43
@MartinR This question is about interoperability between whichever ABI supports Swift, C, C++ and potentially a whole host of other programming languages... The question and answer for all of those languages is the same, so they should all be tagged too, right? — autistic
– autistic, Commented Aug 16, 2015 at 9:01
@Freenode-newbostonSebivor,MartinR I don't think we have to start this discussion again here. I removed the [c] tag as the issue targets Swift and not C. Thank you both for helping! — dasmaximum
– dasmaximum, Commented Aug 16, 2015 at 9:08

Martin R · Accepted Answer · 2015-08-16 08:47:48Z

6

The C type char is mapped to Swift as CChar, which is an alias for Int8. You can create a Swift string from a single C character with

let delim = String(UnicodeScalar(UInt8(bitPattern: folder.delimiter)))

This interprets the given char as a Unicode value in the range 0 ... 255 and converts it to a String.

answered Aug 16, 2015 at 8:47

Martin R

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1 Comment

dasmaximum Over a year ago

That did the trick, thank you! To my defense, this is not very obvious, is it? ;-)

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