当在Simulator/Xcode中录制音频时，Fresh SpeakHere示例应用程序有错误 [英] Fresh SpeakHere example app has error when recording audio in Simulator/Xcode
问题描述
我无法使用 SpeakHere 苹果提供的示例应用.当我从Xcode在Simulator中运行应用程序时，它正常启动，但是当我按下记录按钮时，出现错误线程1:EXC_BREAKPOINT(code = EXC_I386_BPT，子代码= 0x0)":
在发生上述错误之前，有关应用启动时缺少根视图控制器的日志消息已经存在，并且可能与我的问题无关.
我已经从链接的网站下载了SpeakHere示例项目(请参阅此问题的顶部)，在Xcode中打开了全新的下载文件，并直接启动了该应用程序.我没有修改任何设置，也没有任何代码行.我也在google和stackoverflow上搜索了此问题，但没有找到解决方案，尽管此问题必须非常笼统.
我使用Xcode版本4.5.2(4G2008a)和2009年底的Mac OS X 10.8上的MacBook Pro.
我也有一个朋友在他的计算机上尝试此操作，他也遇到了同样的问题.他具有相同的操作系统，并且他的XCode版本也为4.5.2.
我现在将尝试使用较旧的Xcode版本，但是现在我不希望下载几GB的数据来尝试在连接时尝试"n'error"方法.
任何帮助表示赞赏，包括诸如为Xcode版本为我工作..."之类的报告.谢谢！
之所以会出现此问题，是因为在方法AQRecorder::StartRecord(CFStringRef inRecordFile)中，函数CFURLCreateWithString()失败并返回了指向nil的指针.不会检测到此错误，稍后会在此nil指针上的代码调用CFRelease()上，这将导致EXC_BREAKPOINT.
方法CFURLCreateWithString()的目的基本上是将url字符串作为输入，并返回指向CFURL对象的指针作为输出.这里的问题是输入不是url字符串.相反，它只是本地文件系统上的路径，没有file:/等作为前缀.因此，此方法失败.
解决方案是删除对方法CFURLCreateWithString()的无效调用，而是调用相关方法CFURLCreateWithFileSystemPath()，该方法准备采用本地文件系统路径并将其转换为CFURL:
在方法AQRecorder::StartRecord(CFStringRef inRecordFile)中，替换或注释掉该行
url = CFURLCreateWithString(kCFAllocatorDefault, (CFStringRef)recordFile, NULL);
然后插入
url = CFURLCreateWithFileSystemPath(kCFAllocatorDefault, (CFStringRef)recordFile, kCFURLPOSIXPathStyle, false);
在其位置.
I can't record audio using the SpeakHere example app from apple. When I run the app in Simulator from within Xcode, it starts up normally, but when I press the record button, the error "Thread 1: EXC_BREAKPOINT (code=EXC_I386_BPT, subcode=0x0)" occurs:
The log message about the missing root view controller at app startup is already there BEFORE the above error occurs and it is probably not connected to my problem.
I have downloaded the SpeakHere example project from the linked website (see top of this question), opened the fresh download in Xcode and directly started the app. I did not modify any setting and not any line of code. I've also searched on google and stackoverflow for this problem and didn't find a solution, although this problem must be very general.
I use Xcode Version 4.5.2 (4G2008a) and a MacBook Pro from late 2009 with Mac OS X 10.8.
I've also had a friend try this on his computer and he has the very same problem. He has the same OS and his XCode version is also 4.5.2.
I would now try older Xcode versions, but right now I don't like to download a few gigabytes for a trial'n'error approach on my connection.
Any help appreciated, including reports like "works for me with Xcode version ...". Thanks!
The problem occurs because in the method AQRecorder::StartRecord(CFStringRef inRecordFile), the function CFURLCreateWithString() fails and returns a pointer to nil. This is not detected and later on the code calls CFRelease() on this nil pointer, which causes the EXC_BREAKPOINT.
The purpose of the method CFURLCreateWithString() basically is to take a url string as input and return a pointer to a CFURL object as output. The problem here is that the input is not a url string. Instead, it's simply a path on the local file system without file:/ or the like as prefix. For this reason, this method fails.
The solution is to remove the not-working call to the method CFURLCreateWithString() and instead call a related method, namely CFURLCreateWithFileSystemPath(), which is prepared to take a local file system path and convert it to a CFURL:
In the method AQRecorder::StartRecord(CFStringRef inRecordFile), replace or comment out the line
url = CFURLCreateWithString(kCFAllocatorDefault, (CFStringRef)recordFile, NULL);
and insert
url = CFURLCreateWithFileSystemPath(kCFAllocatorDefault, (CFStringRef)recordFile, kCFURLPOSIXPathStyle, false);
at its place.
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