CFURLRef需要一个桥接施放的错误 [英] CFURLRef requires a bridged cast error
问题描述
我试图让要播放的声音，但是当我code：
I'm trying to get a sound to play but when I code:
AudioServicesCreateSystemSoundID ((CFURLRef) alertSound, &soundFileObject);
这引发以下错误：
it throws the following error:
Objective-C的指针类型'NSURL *'的演员到C指针类型CFURLRef（又名const的结构__CFURL *）需要一个桥接投误差
Cast of Objective-C pointer type 'NSURL *' to C pointer type 'CFURLRef' (aka 'const struct __CFURL *') requires a bridged cast error
我已经试过这两个以下两个建议的解决方案：
I have tried both of the two following suggested solutions:
AudioServicesCreateSystemSoundID ((__bridge CFURLRef) alertSound, &soundFileObject);
或
AudioServicesCreateSystemSoundID ((CFURLRef) CFBridgingRetain(alertSound), &soundFileObject);
但我仍然不能得到的声音播放。
But I still can't get the sound to play.
我想问题是：是桥接错误的声音不玩的原因，或者我应该寻找别的地方
I guess the question is: is the bridging error the cause of the sound not playing, or should I be looking else where?
我能得到声音使用SysSound样本code打，我使用的是iOS 6和X code ++ 4.5。
I can get the sound to play using the SysSound sample code and I'm using iOS 6 and Xcode 4.5.
感谢您的任何指针：）
推荐答案
演员阵容很可能不是声音不玩的原因：
The cast is probably not the reason the sound is not playing:
AudioServicesCreateSystemSoundID ((__bridge CFURLRef) alertSound, &soundFileObject);
是好的。
最有可能你的错误是在你还没有告诉我们code。一个常见的问题是在URL创建或无效的文件格式错误。
Most likely your error is in code that you have not shown us. A common problem is an error in the URL creation or an invalid file format.
修改您的code如下：
Modify your code as follows:
OSStatus status = AudioServicesCreateSystemSoundID((__bridge CFURLRef)alertSound, &soundFileObject);
NSLog(@"AudioServicesCreateSystemSoundID status = %ld", status);
和检查你会得到什么样的地位code; parmErr （-50）是比较常见的，通常意味着您的网址是零。
and check what status code you get; parmErr (-50) is relatively common and usually means your URL is nil.
哦，还有更多的思考，你不显示，你实际上是在播放声音。你知道， AudioServicesCreateSystemSoundID 实际上并没有播放声音。你需要调用：
Oh, and one more thought, you don't show where you're actually playing the sound. You do know that AudioServicesCreateSystemSoundID does not actually play the sound. You need to call:
AudioServicesPlaySystemSound(soundFileObject);
道歉，如果你已经知道了！
Apologies if you knew that already!
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