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POWhat does this error even mean?
 

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  1. POWhat does this error even mean?
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    <p>I got this error, and as I program xcode only at my house, I have no resources to quickly ask even the most simple 10 second questions. So this is one that came up today, I am using the AudioSessionAddPropertyListener function, and I get this warning:</p> <p>passing 'CFTypeRef' (aka 'const void <em>) to parameter of type 'void</em>' discards Qualifiers</p> <p>from this line of code.</p> <pre><code>// Registers the audio route change listener callback function // An instance of the audio player/manager is passed to the listener AudioSessionAddPropertyListener ( kAudioSessionProperty_AudioRouteChange, audioRouteChangeListenerCallback, CFBridgingRetain(self) ); </code></pre> <p>then definition of the AudioSessionAddPropertyListener is </p> <pre><code>AudioSessionAddPropertyListener( AudioSessionPropertyID inID, AudioSessionPropertyListener inProc, void *inClientData) </code></pre> <p>and I see the *inClientData variable appears to be of type void (Or maybe not)</p> <p>So what exactly might be the problem here, Mostly I would like to know what to look for when trouble shooting. I don't know what I don't know.</p> <p>thanks</p> <p>Steve </p> <p>I'm not at 50 yet so I can't comment:</p> <p>I looked at the definition of CFBridgingRetain it takes ID, and returns CFTypeRef</p> <pre><code>NS_INLINE CF_RETURNS_RETAINED CFTypeRef CFBridgingRetain(id X) { return (__bridge_retained CFTypeRef)X; } </code></pre> <p>Now the definition of CFTypeRef is void /* Base "type" of all "CF objects", and polymorphic functions on them */ typedef const void * CFTypeRef;</p> <p>so in order to drop the warning I did this, cast the output of the function as (void *)</p> <pre><code>AudioSessionAddPropertyListener ( kAudioSessionProperty_AudioRouteChange, audioRouteChangeListenerCallback, (void *) CFBridgingRetain(self) ); </code></pre> <p>Does anyone see an issue with this?</p>
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    1. PTQuestion
    1. USSESPROUL
    1. USSESPROUL
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      1. LTLinked
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    1. COcheck this topic [sending CFTypeRef (aka const void*) to parameter of type 'void *' discards qualifiers][1] [1]: http://stackoverflow.com/questions/17038376/sending-cftyperef-aka-const-void-to-parameter-of-type-void-discards-quali
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      1. POWhat does this error even mean?
      1. USByteArtisan
    2. COI think you omitted `*` when you quoted the above message. It's important.
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      1. POWhat does this error even mean?
      1. USHot Licks
    3. COThanks for all the help! I'll check this out.
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      1. POWhat does this error even mean?
      1. USSESPROUL
 

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