在包含AudioToolbox框架的objective-C iOS项目中找不到AudioServices.h [英] AudioServices.h not found in objective-C iOS project that includes AudioToolbox framework

问题描述

根据Apple文档，AudioServices.h应该是AudioToolbox框架的一部分。

According to the apple documentation, AudioServices.h should be part of the AudioToolbox framework.

即使我已经将AudioToolbox框架添加到我的Xcode项目中，当我#import AudioServices我收到错误：找不到AudioServices.h文件。

Even though I have added the AudioToolbox framework to my Xcode project, when I #import AudioServices I get the error: AudioServices.h file not found.

无论我输入
#importAudioServices.h，都会发生这种情况

This happens whether I type #import "AudioServices.h"

或
#importAudioToolbox / AudioServices.h
。

or #import "AudioToolbox/AudioServices.h" .

以防万一，我尝试删除然后重新添加AudioToolbox框架，这没有任何效果。 AudioServices文件可能会以某种方式被破坏吗？ （如果有，有谁知道我可以在哪里下载另一个副本？）

Just in case, I tried removing and then re-adding the AudioToolbox framework, which had no effect. Could the AudioServices file be corrupted somehow? (If so, does anyone know where I could download another copy?)

我正在使用XCode 4.2，但是当我转换一些旧的开源代码时，项目是设置为XCode 3.2兼容。这可能是问题吗？

I am using XCode 4.2, but as I am converting some old open source code, the project is set to be XCode 3.2-compatible. Could this be the issue?

我确定我错过了一些简单的事情。我对编程很陌生......任何帮助都很感激！

I'm sure I'm missing something simple. I am totally new to programming... any help appreciated!

-----编辑（见下面的评论）-----

-----EDIT (see my comment below)-----

，这两个函数有问题：

extern OSStatus
AudioSessionInitialize( CFRunLoopRef                        inRunLoop, 
                        CFStringRef                         inRunLoopMode, 
                        AudioSessionInterruptionListener    inInterruptionListener, 
                        void                                *inClientData)              

extern OSStatus
AudioSessionAddPropertyListener(    AudioSessionPropertyID              inID,
                                    AudioSessionPropertyListener        inProc,
                                    void                                *inClientData)

在SpeakHereController.mm中（来自示例Apple代码） ），我试图转换为ARC以使其合作b etter与我项目中的其他文件：

in SpeakHereController.mm (from sample Apple code), which I am trying to convert to ARC to get it to cooperate better with the other files in my project:

- (void)awakeFromNib
{       

// Allocate our singleton instance for the recorder & player object
recorder = new AQRecorder();
player = new AQPlayer();


OSStatus error = AudioSessionInitialize(NULL, NULL, interruptionListener, self);
if (error) printf("ERROR INITIALIZING AUDIO SESSION! %ld\n", error);
else 
{
    UInt32 category = kAudioSessionCategory_PlayAndRecord;  
    error = AudioSessionSetProperty(kAudioSessionProperty_AudioCategory, sizeof(category), &category);
    if (error) printf("couldn't set audio category!");

    error = AudioSessionAddPropertyListener(kAudioSessionProperty_AudioRouteChange, propListener, self);
    if (error) printf("ERROR ADDING AUDIO SESSION PROP LISTENER! %ld\n", error);
    UInt32 inputAvailable = 0;
    UInt32 size = sizeof(inputAvailable);

    // we do not want to allow recording if input is not available
    error = AudioSessionGetProperty(kAudioSessionProperty_AudioInputAvailable, &size, &inputAvailable);
    if (error) printf("ERROR GETTING INPUT AVAILABILITY! %ld\n", error);
    btn_record.enabled = (inputAvailable) ? YES : NO;

    // we also need to listen to see if input availability changes
    error = AudioSessionAddPropertyListener(kAudioSessionProperty_AudioInputAvailable, propListener, self);
    if (error) printf("ERROR ADDING AUDIO SESSION PROP LISTENER! %ld\n", error);

    error = AudioSessionSetActive(true); 
    if (error) printf("AudioSessionSetActive (true) failed");
}

推荐答案

问题在于系统当您使用ARC时，无法自动将 self 强制转换为void *。在AudioSessionInitialize函数（和其他）的最后一个参数中使用Self。

The problem is that the system can't cast self to void * automatically when you're using ARC. Self is used in the last parameter of AudioSessionInitialize function (and others).

您需要告诉ARC如何通过手动将其转换为void来控制内存的所有权*使用__bridge。这表示不要更改内存的所有权。

You need to tell ARC how the ownership of the memory is controlled by manually casting it to void * using __bridge. This says 'Don't change ownership of the memory'.

因此，在调用AudioSession函数时，将self更改为（__bridge void *）self。

So change self to (__bridge void *)self in the calls to the AudioSession functions.

例如

OSStatus error = AudioSessionInitialize(NULL, NULL, interruptionListener, (__bridge void*)self);

这篇关于在包含AudioToolbox框架的objective-C iOS项目中找不到AudioServices.h的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！