获取经典蓝牙连接设备列表（无BLE）[EAAccessoryManager] [英] Get the list of classic bluetooth connected devices (no BLE) [EAAccessoryManager]

问题描述

我需要做一个能够判断我当前是否连接到经典蓝牙设备的应用程序（实际上，它将是蓝牙车载设备）。

I need to do an app which will be able to tell if I am currently connected to a classic Bluetooth device or not (actually, it will be a Bluetooth car device).

我的第一步是告诉当前连接的经典蓝牙设备是什么。我不能使用CoreBluetooth，因为它只适用于LE。我尝试使用外部附件框架。

My first step is to tell what are the current connected classic Bluetooth devices. I cannot use CoreBluetooth because it's only for LE. I try to use the External Accessory framework.

这是代码（一个按钮启动方法）：

Here is the code (a button starts the method):

- (IBAction)startMethodGetConnected:(id)sender {
     NSLog(@"button taped");
     // Get the number of accessories connected
     NSUInteger NumberOfAccessoriesConnected = [[EAAccessoryManager sharedAccessoryManager].connectedAccessories count];
     //Display the number 
     NSLog(@"number of accessories connected : %d", NumberOfAccessoriesConnected);
 }

我已经尝试将iPhone连接到蓝牙键盘并同时使用蓝牙耳机。在这两种情况下，控制台都会显示该数字为0.

I have tried when the iPhone was connected to a Bluetooth keyboard and also with a Bluetooth headset. In both cases, the console displays that the number is 0.

如何显示正确的数字？

推荐答案

你做不到。你可以做的是检查播放路线。问题是你的汽车免提将成为HeadsetBT。这是我在我的应用程序中使用的代码。

You cannot. What you can do is to check the playback route. The problem is that your cars handsfree will be a HeadsetBT. This is the code I use in my app.

// create and set up the audio session
AVAudioSession* audioSession = [AVAudioSession sharedInstance];
[audioSession setDelegate:self];
[audioSession setCategory: AVAudioSessionCategoryPlayAndRecord error: nil];
[audioSession setActive: YES error: nil];

// set up for bluetooth microphone input
UInt32 allowBluetoothInput = 1;
OSStatus stat = AudioSessionSetProperty (kAudioSessionProperty_OverrideCategoryEnableBluetoothInput,
                                         sizeof (allowBluetoothInput),
                                         &allowBluetoothInput
                                         );
NSLog(@"status = %x", stat);    // problem if this is not zero

// check the audio route
UInt32 size = sizeof(CFStringRef);
CFStringRef route;
OSStatus result = AudioSessionGetProperty(kAudioSessionProperty_AudioRoute, &size, &route);
NSLog(@"route = %@", route);
// if bluetooth headset connected, should be "HeadsetBT"
// if not connected, will be "ReceiverAndMicrophone"

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