How to convert URL into Unmanaged<CFURL> using Swift?

Question

In Swift I am trying to create an AUSamplerBankPresetData object which requires an Unmanaged<CFURL> object.

How do I convert a URL object into Unmanaged<CFURL> in swift?

rpecka · Accepted Answer · 2021-10-13 23:23:20Z

7

You first need to convert your URL into a CFURL. This can be done with an unconditional cast so:

let cfurl = url as CFURL

Then, to create an unmanaged reference to that CFURL you'll need to use one of the functions outlined here to create an Unmanaged object. Make sure you choose the right one for your application. The example below will increment the reference count, so you will need to make sure that it is decremented later.

var um = Unmanaged<CFURL>.passRetained(cfurl)

edited Oct 13, 2021 at 23:23

answered Apr 19, 2019 at 16:20

rpecka

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1 Comment

Martin R Over a year ago

Note that passRetained() increases the refcount, so this must be balanced eventually to avoid a memory leak.

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