You should actually be able to set errno to 0 *before* the first call, and it
should never return failure unless there was actually a real problem with
permissions, etc.
-DS
> On Oct 13, 2016, at 3:46 PM, down to this <downtot...@gmail.com> wrote:
>
> Just wanted to follow up regarding this. As per the work-around the Douglas
> Scott suggested below, I've implemented this successfully in my app and it is
> working without issues.
>
> For those who are unaware (as I was), the 'errno' value can simply be set
> directly. By updating the "errno" value to 0 after a failed call, subsequent
> calls to 'MusicSequenceFileLoad' generate a successful response. Therefore,
> I've amended my code as follows:
>
> OSStatus statusOfInitialAttempt =
> CheckError(MusicSequenceFileLoad(self.masterMidiMusicSequence, (__bridge
> CFURLRef)midiFileURL, 0, 0), "MusicSequenceFileLoad");
> if (statusOfInitialAttempt == -1) {
> errno = 0;
>
> OSStatus statusOfSecondAttempt =
> CheckErrorAndReturnOnFailure(MusicSequenceFileLoad(self.masterMidiMusicSequence,
> (__bridge CFURLRef)midiFileURL, 0, 0), "MusicSequenceFileLoad");
>
> if (statusOfSecondAttempt == -1) {
> // Handle error case
> }
> }
> Thanks Douglas for your help with this!
>
> Best,
>
> Derek
>
>
> Date: Sun, 09 Oct 2016 22:15:03 -0700
> From: Douglas Scott <douglas_sc...@apple.com <mailto:douglas_sc...@apple.com>>
> To: Sven Thoennissen <bioch...@me.com <mailto:bioch...@me.com>>
> Cc: coreaudio-api@lists.apple.com <mailto:coreaudio-api@lists.apple.com>
> Subject: Re: MusicSequenceFileLoad Returns -1 on iOS10
> (AudioToolbox/MusicPlayer)
> Message-ID: <43be2217-7a15-4f03-9338-728acd0ff...@apple.com
> <mailto:43be2217-7a15-4f03-9338-728acd0ff...@apple.com>>
> Content-Type: text/plain; charset="utf-8"
>
> I cannot promise the specific release in which this will be fixed, but the
> problem is understood, and I can tell you that if you can force ‘errno’ to
> reset to 0, any following call to MusicSequenceFileLoadData() will succeed.
>
> -DS
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