print() behavior difference, working as designed.


(Dru Satori) #1

( Oops, hit wrong button )

While working on making some adjustments to code that has been developed for OSX/iOS that would allow it to be portable to Linux, we are seeing a behavior that is causing some confusion. I’m not sure it is a bug, it may well be working as designed.

At issue the following code: (where value is an UnsafeMutablePointer<void> containing a pointer to a MacOSRomanStringEncoding of the string ‘hello’)

let data : NSData = NSData.init(bytes:value, length:len)
    let s : String = String.init(data:data,
      encoding:NSMacOSRomanStringEncoding)!
    print("Value: \(s)")

On OSX, this results in a print of:

Value: hello

While on Linux it results in a print of:

Value: (Foundation.NSData, 30)

Is this an intentional design change, or is our simple test case written wrong, or something equally stupid?

···

On 12/17/15, 10:27 AM, "swift-users-bounces@swift.org on behalf of Dru Satori via swift-users" <swift-users-bounces@swift.org on behalf of swift-users@swift.org> wrote:

While working on making some adjustments to code that has been developed for OSX/iOS that would allow it to be portable to Linux, we are seeing a behavior that is causing some confusion. I’m not sure it is a bug, it may well be working as designed.

At issue the following code: (where value is an UnsafeMutablePointer<void> containing a pointer to a MacOSRomanStringEncoding of the string ‘hello’)

let data : NSData = NSData.init(bytes:value, length:len)
  let s : String = String.init(data:data,
    encoding:NSMacOSRomanStringEncoding)!
  print("Value: \(s)")

On OSX, this results in a print of:

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