Getting bundle identifier in Swift

Question

I'm trying to get bundleID using app's directory and I'm getting an error: EXC_BAD_ACCESS(code=1, address=0xd8)

application.directory! is a String

let startCString = (application.directory! as NSString).UTF8String //Type: UnsafePointer<Int8>
let convertedCString = UnsafePointer<UInt8>(startCString) //CFURLCreateFromFileRepresentation needs <UInt8> pointer
let length = application.directory!.lengthOfBytesUsingEncoding(NSUTF8StringEncoding)
let dir = CFURLCreateFromFileSystemRepresentation(kCFAllocatorDefault, convertedCString, length, false)
let bundle = CFBundleCreate(kCFAllocatorDefault, dir)
let result = CFBundleGetIdentifier(bundle)

and I get this error on the result line.

What am I doing wrong here?

Answer 1

One potential problem with your code is that the pointer obtained in

let startCString = (application.directory! as NSString).UTF8String //Type: UnsafePointer<Int8>

is valid only as long as the temporary NSString exists. But that conversion to a C string can be done "automatically" by the compiler (compare String value to UnsafePointer<UInt8> function parameter behavior), so a working version should be

let dir = CFURLCreateFromFileSystemRepresentation(kCFAllocatorDefault, path, Int(strlen(path)), false)
let bundle = CFBundleCreate(kCFAllocatorDefault, dir)
let result = CFBundleGetIdentifier(bundle)

But you can simply create a NSBundle from a given path and obtain its identifier:

let ident = NSBundle(path: path)!.bundleIdentifier!

Full example with added error checking:

let path = "/Applications/TextEdit.app"

if let bundle = NSBundle(path: path) {
    if let ident = bundle.bundleIdentifier {
        print(ident) // com.apple.TextEdit
    } else {
        print("bundle has no identifier")
    }
} else {
    print("bundle not found")
}