AVAudioPlayer 在调试模式下抛出断点

每次我加载这个应用程序，它都会停止，就好像我在这一行上设置了一个断点:

self.audioPlayer =
[[[AVAudioPlayer alloc] initWithData:[dataPersister loadData:self.fileName]
error:&outError] autorelease];

上面没有断点，这条线附近也没有。只有在调试模式下运行应用程序时才会出现这种情况，而且在断点之后没有崩溃。当我点击“继续程序执行”时，应用程序工作正常。

这是用 initWithData调用的 loadData 方法:

-(NSData*)loadData:(NSString*)fileName
{
NSString *dataPath = [self.path stringByAppendingPathComponent:fileName];
dataPath = [dataPath stringByStandardizingPath];
NSData *data = [[[NSData alloc] initWithContentsOfFile:dataPath]autorelease ];
return data;
}

LoadData 函数似乎工作正常。请求的 mp3文件在断点之后加载并播放，没有任何问题。

你知道我哪里做错了吗？

编辑: 当它停在断点时，我回溯了一下，输出如下:

(lldb) bt
* thread #1: tid = 0x1c03, 0x30df1724 libc++abi.dylib`__cxa_throw, stop reason = breakpoint 1.2
frame #0: 0x30df1724 libc++abi.dylib`__cxa_throw
frame #1: 0x36403a24 AudioToolbox`ID3ParserHandle::ID3ParserHandle(void*, long (*)(void*, unsigned long, unsigned long, unsigned long, void**, unsigned long*)) + 452
frame #2: 0x36403b0e AudioToolbox`ID3ParserOpen + 142
frame #3: 0x3635bd16 AudioToolbox`MPEGAudioFile::ParseID3Tags() + 58
frame #4: 0x3635b9aa AudioToolbox`MPEGAudioFile::ParseAudioFile() + 26
frame #5: 0x3631723e AudioToolbox`AudioFileObject::DoOpenWithCallbacks(void*, long (*)(void*, long long, unsigned long, void*, unsigned long*), long (*)(void*, long long, unsigned long, void const*, unsigned long*), long long (*)(void*), long (*)(void*, long long)) + 166
frame #6: 0x36316480 AudioToolbox`AudioFileOpenWithCallbacks + 612
frame #7: 0x31f4c1ec AVFoundation`-[AVAudioPlayer initWithData:error:] + 120

“ Solutions”: 结果是，如果我对所有异常禁用异常断点，并且只对 Objective-C 异常使用断点，那么问题就会消失。但这并不能解决 AVAudioPlayer 的分配引发 C + + 异常的问题。

12016

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AVAudioPlayer and AVAudioRecorder both will throw exceptions, several of them. These are handled internally by the players but if you have a breakpoint for "All Breakpoints" (i.e. Exception: All, Break: On Throw) you will catch these exceptions. If you continue execution on these, the app will continue to run normally and not crash at all.

~~The only solution I've come up with so far is to click on the breakpoint bar in the Breakpoint Navigator, disabling this particular breakpoint, and running with it disabled.~~

~~When/if the app ever crashes with a thrown exception, I cmd-6, enable that breakpoint, and rerun and do whatever I did when it crashed.~~

Edit: setting to "Objective-C exceptions" is obviously how to do it. See above answer!

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最佳答案

Add your exception breakpoint and edit the exception type from "All" to "Objective-C exceptions"

Some classes in AudioToolbox throw regular C++ exceptions. You can filter them off this way.

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The backtrace helped a lot, thanks!. We'd started running into the same issue recently. It turns out the mp3 files it was throwing on did not have a valid ID3 tag and running them through an app such as Tagr fixed them right up!

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Try setting the AVAudioPlayer as a class Variable!

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Here's a screenshot showing how I fixed this error. I'm not sure if this is the same way that the answers above are talking about, but I assume its similar.

Go to the Breakpoint navigator in Xcode.
Control-click on the 'All Exceptions' line.
Select the 'Edit Breakpoint...' option.
Change the Exception from All to Objective-C.

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In Xcode 9.2 you can disable specific exceptions after you've seen them. Open breakpoints menu and click to disable (faded arrow)