这个应用程序是在ios 5.0下开发的，运行良好，但在ios 4.3下崩溃

发布于 2024-12-19 21:00:24 字数 1549 浏览 1 评论 0原文

我在iOS 5.0下开发了一个iPhone应用程序，并且运行良好。但当涉及到 iOS 4.3（Base SDK = 最新的 iOS 5.0，编译器 = Apple LLVM 3.0，部署目标 = iOS 4.3）时，启动后就会崩溃。

崩溃点周围的输出如下所示：

2011-12-06 16:25:08.177 FMWei[466:c203] -[AVAudioSession setMode:error:]: unrecognized selector sent to instance 0x706a7f0
2011-12-06 16:25:08.181 FMWei[466:c203] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[AVAudioSession setMode:error:]: unrecognized selector sent to instance 0x706a7f0'

看起来 AVAudioSession 在我调用它时没有成员函数 setMode:error:。但奇怪的是，我没有调用名为 setMode:error: 的函数。关于音频处理的代码是：

audio_session = [[AVAudioSession sharedInstance] retain];
audio_session_err = nil;
[audio_session setCategory: AVAudioSessionCategoryPlayAndRecord error:&audio_session_err];
NSLog(@"!");

UInt32 audioRouteOverride = 1;
AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryDefaultToSpeaker,sizeof (audioRouteOverride),&audioRouteOverride);
UInt32 allowMixing = 1;
AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryMixWithOthers, sizeof(allowMixing), &allowMixing);    

if (audio_session_err) 
{
    NSLog(@"audioSession: %@ %d %@", [audio_session_err domain], [audio_session_err code], [audio_session_err description]);
}
else
{
    audio_session_err = nil;
    [audio_session setActive:YES error:&audio_session_err];
    if (!audio_session_err) NSLog(@"audio session is activated successfully");
}

请帮我弄清楚为什么它在 iOS 4.3 下崩溃并出现奇怪的错误。谢谢你！

原文

I developed an iPhone app under iOS 5.0, and it works fine. But when it comes to iOS 4.3(Base SDK = latest iOS 5.0, compiler = Apple LLVM 3.0, Deployment Target = iOS 4.3), it crashes after launching.

The output around crash point looks like:

2011-12-06 16:25:08.177 FMWei[466:c203] -[AVAudioSession setMode:error:]: unrecognized selector sent to instance 0x706a7f0
2011-12-06 16:25:08.181 FMWei[466:c203] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[AVAudioSession setMode:error:]: unrecognized selector sent to instance 0x706a7f0'

It looks like that AVAudioSession doesn't have a member function setMode:error: while I invoked it. But what's strange is that I didn't invoke a function whose name is setMode:error:. The code about audio processing is:

audio_session = [[AVAudioSession sharedInstance] retain];
audio_session_err = nil;
[audio_session setCategory: AVAudioSessionCategoryPlayAndRecord error:&audio_session_err];
NSLog(@"!");

UInt32 audioRouteOverride = 1;
AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryDefaultToSpeaker,sizeof (audioRouteOverride),&audioRouteOverride);
UInt32 allowMixing = 1;
AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryMixWithOthers, sizeof(allowMixing), &allowMixing);    

if (audio_session_err) 
{
    NSLog(@"audioSession: %@ %d %@", [audio_session_err domain], [audio_session_err code], [audio_session_err description]);
}
else
{
    audio_session_err = nil;
    [audio_session setActive:YES error:&audio_session_err];
    if (!audio_session_err) NSLog(@"audio session is activated successfully");
}

Please help me figure out why it crashes under iOS 4.3 with the strange error. Thank you!

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素年丶 2024-12-26 21:00:24

在运行时，会调用许多不在代码中的方法，但由于您进行的 API 调用而在幕后调用这些方法。

我不会关注正在调用的方法，而是关注它发送到的对象为何无法响应选择器。该对象可能被转换为错误的类型，因此没有继承正确的方法。（在您显示的代码片段中，您没有显式转换 AVAudioSession *audio_session。）另一个方向是检查您是否没有使用仅适用于 iOS 5 的其他 API 调用，这在后台正在调用此方法并因此产生错误。

最后，如果您最近才将构建目标更改为包含 iOS 4.3，则可能只需要执行全新构建（Product > Clean），以便编译与 iOS 4.3 兼容的代码。

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神回复 2024-12-26 21:00:24

也许您可以尝试下面的代码片段，

[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:&sessionError];
NSError * audio_session_err = nil;
[audio_session setCategory: AVAudioSessionCategoryPlayAndRecord error:&audio_session_err];
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:&audio_session_err];
[[AVAudioSession sharedInstance] setDelegate:self];
NSLog(@"!");

UInt32 audioRouteOverride = 1;
AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryDefaultToSpeaker,sizeof (audioRouteOverride),&audioRouteOverride);
UInt32 allowMixing = 1;
AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryMixWithOthers, sizeof(allowMixing), &allowMixing);    

if (audio_session_err) {
  NSLog(@"audioSession: %@ %d %@", [audio_session_err domain], [audio_session_err code], [audio_session_err description]);
} else {
  audio_session_err = nil;
  [[AVAudioSession sharedInstance] setActive:YES error:&audio_session_err];
  if (!audio_session_err) NSLog(@"audio session is activated successfully");
}

我认为 audio_session = [[AVAudioSession sharedInstance] keep]; 默认情况下会调度方法 setMode: 。并且 setMode: 仅在 iOS 5.0 及更高版本中可用（请参阅 文档）。

或者您可以尝试注释掉代码：

UInt32 audioRouteOverride = 1;
AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryDefaultToSpeaker,sizeof (audioRouteOverride),&audioRouteOverride);
UInt32 allowMixing = 1;
AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryMixWithOthers, sizeof(allowMixing), &allowMixing);

默认情况下必须有一个方法调度 setMode: 。自己尝试一下。 :p

尝试在 gdb 中使用 info malloc 0x706a7f0 来获取选择器发送到的对象。请注意，0x706a7f0 是崩溃输出中显示的地址，与第一个代码片段中的地址相同。

另一个提示，您可以执行 make clean(Poduct->Clean) 并rebuild 它。

Maybe you can try the code snippet below

[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:&sessionError];
NSError * audio_session_err = nil;
[audio_session setCategory: AVAudioSessionCategoryPlayAndRecord error:&audio_session_err];
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:&audio_session_err];
[[AVAudioSession sharedInstance] setDelegate:self];
NSLog(@"!");

UInt32 audioRouteOverride = 1;
AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryDefaultToSpeaker,sizeof (audioRouteOverride),&audioRouteOverride);
UInt32 allowMixing = 1;
AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryMixWithOthers, sizeof(allowMixing), &allowMixing);    

if (audio_session_err) {
  NSLog(@"audioSession: %@ %d %@", [audio_session_err domain], [audio_session_err code], [audio_session_err description]);
} else {
  audio_session_err = nil;
  [[AVAudioSession sharedInstance] setActive:YES error:&audio_session_err];
  if (!audio_session_err) NSLog(@"audio session is activated successfully");
}

I think audio_session = [[AVAudioSession sharedInstance] retain]; dispatchs the method setMode: by default. And the setMode: is only available in iOS 5.0 and later(refer to the Doc).

Or you can try to comment out the code:

UInt32 audioRouteOverride = 1;
AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryDefaultToSpeaker,sizeof (audioRouteOverride),&audioRouteOverride);
UInt32 allowMixing = 1;
AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryMixWithOthers, sizeof(allowMixing), &allowMixing);

There must be a method dispatches the setMode: by default. Try yourself. :p

Try info malloc 0x706a7f0 in your gdb to get the object that the selector was sent to. Note, the 0x706a7f0 is the address that shown in your crash output as the one in your first code snippet.

And another tip, you might do make clean(Poduct->Clean) and rebuild it.

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む无字情书 2024-12-26 21:00:24

AVAudioSession 方法

- (BOOL)setMode:(NSString *)theMode error:(NSError **)outError

在文档中被标记为仅适用于 iOS 5 及更高版本。事实上鉴于最近在文档中添加了模式，看起来音频会话模式在 iOS 之前根本不可用5.

The AVAudioSession method

- (BOOL)setMode:(NSString *)theMode error:(NSError **)outError

Is marked in the documentation as being available only for iOS 5 and later. In fact given the recent addition of modes to the documentation, it looks like audio session modes are not available at all prior to iOS 5.

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