Question

我正在开发一个iOS应用，该应用通过OBD2适配器在iOS设备和车辆之间建立通信。为此，我使用了一个库-LTSupportAutomotive。沟通良好。当适配器从车辆上断开连接并因此中断连接时，就会出现问题。有一阵子我崩溃了。我有一个Crashlytics崩溃报告，错误是EXC_BAD_ACCESS KERN_INVALID_ADDRESS 0x00000008ba9ae0a0。从我阅读的内容来看，这意味着有一个指向无效内存的指针。我真的不明白为什么会发生这种情况以及如何进行解决。崩溃是通过库中的以下方法发生的：

-(void)centralManager:(CBCentralManager *)central didDisconnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error
{
    LOG( @"Did disconnect %@: %@", peripheral, error );
    if ( peripheral == _adapter )
    {
        [_inputStream close];
        [_outputStream close];
    }
}

有一条连接中断的通知。当我处理它时，我将变量指向具有以上方法的类（LTBTLESerialTransporter）的对象nil。这应调用其dealloc方法，其中应调用方法disconnect：

-(void)disconnect
{
    [self stopUpdatingSignalStrength];

    [_inputStream close];
    [_outputStream close];

    if ( _adapter )
    {
        [_manager cancelPeripheralConnection:_adapter];
    }

    [_possibleAdapters enumerateObjectsUsingBlock:^(CBPeripheral * _Nonnull peripheral, NSUInteger idx, BOOL * _Nonnull stop) {
        [_manager cancelPeripheralConnection:peripheral];
    }];
}

崩溃报告如下：

崩溃：LTBTLESerialTransporter

0 libobjc.A.dylib 0x1d35a3bf0 objc_retain + 16

1 LTSupportAutomotive 0x100d58040-[LTBTLEWriteCharacteristicStream close] + 80

2 LTSupportAutomotive 0x100d56c04-[LTBTLESerialTransporter centralManager：didDisconnectPeripheral：error：] + 264

3 CoreBluetooth 0x1d9e423ec-[CBCentralManager handlePeripheralDisconnectionCompleted：] + 232

4 CoreBluetooth 0x1d9e431e8-[CBCentralManager handleMsg：args：] + 620

5 CoreBluetooth 0x1d9e51430 __30- [CBXpcConnection _handleMsg：] _ block_invoke + 60

6 libdispatch.dylib 0x1d3df0a38 _dispatch_call_block_and_release + 24

7 libdispatch.dylib 0x1d3df17d4 _dispatch_client_callout + 16

8 libdispatch.dylib 0x1d3d9a320 _dispatch_lane_serial_drain $ VARIANT $ mp + 592

9 libdispatch.dylib 0x1d3d9ae70 _dispatch_lane_invoke $ VARIANT $ mp + 480

10 libdispatch.dylib 0x1d3d9a1ec _dispatch_lane_serial_drain $ VARIANT $ mp + 284

11 libdispatch.dylib 0x1d3d9ae3c _dispatch_lane_invoke $ VARIANT $ mp + 428

12 libdispatch.dylib 0x1d3da34a8 _dispatch_workloop_worker_thread + 596

13 libsystem_pthread.dylib 0x1d3fd1114 _pthread_wqthread + 304

14 libsystem_pthread.dylib 0x1d3fd3cd4 start_wqthread + 4

与BLE设备断开连接时，EXC_BAD_ACCESS KERN_INVALID_ADDRESS崩溃

0 个答案: