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iOS蓝牙retrievePeripherals导致EXC_BAD_ACCESS崩溃

[英]iOS Bluetooth retrievePeripherals causes EXC_BAD_ACCESS crash

我需要定期重新连接到外围设备,但尝试重新连接崩溃。

首先,我的中央设备扫描外围设备的UUID,然后进行连接,然后将外围设备.UUID存储到CFUUIDRef变量中,然后断开连接。 接下来,要重新连接,它会从变量中检索UUID,然后在执行retreivePeripherals时崩溃,并以“ EXC_BAD_ACCESS”崩溃,或者在随后进行后续的didRetrievePeripherals时崩溃。

也许我没有正确存储UUID,但没有看到该错误。 谢谢。

这是代码........

-(void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral
{
    ///////////////////////   C E N T R A L   C O N N E C T E D   P E R I P H E R A L   //////////////////////

    [self.centralManager   stopScan];
    // Make sure we get the discovery callbacks
    peripheral.delegate = pwr_tx_management;

    switch( PWR_TX_manager.present_operation )
    {
        case POLLING_FOR_GENERIC_DVINEWAVE_DEVICE:
            if( dbg_ev )        printf("1");        
            // Add new record for connection device to local system status database:
            update_device_record( &packed_ad_record    );       //      ==>  device_record_index
            // Store peripheral UUID for later, perioed re-connection for polling:
            area_device_status[ device_area ][ device_record_index ].peripheral_UUID = peripheral.UUID;
                                 // uses declaration:  CFUUIDRef            peripheral_UUID;

    // Disconnect:        !!!
        [self.centralManager   cancelPeripheralConnection:   peripheral];
        break;


        case OPERATION_SPECIFIC_POLLING:
                                        NSLog( @"(7) didConnectPeripheral   " );
            if( dbg_ev )        printf("2");        
            // Proceed with reading device's status and updating local database:
                [peripheral   discoverServices:nil];    // request service, characteristics, then request device send its packed status record

            break;
        default:
            break;
    }    
}





// Connects to device specificed by index next_dbase_record .
void connect_specific_device( void )
{
                                                        NSLog( @"(5) connect_specific_device    - next_dbase_record = %d", next_dbase_record );
    CFUUIDRef uuid = area_device_status[ device_area ][ next_dbase_record ].peripheral_UUID;

    if( uuid )
    {
        // Request call to didRetrievePeripherals() with CBPeripheral:
        [pwr_tx_management.centralManager retrievePeripherals:[NSArray arrayWithObject: (id)CFBridgingRelease(uuid)]];     <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< crashes here with:  Thread 1: EXC_BAD_ACCESS
    }
    else
    {
        NSLog( @"   - missing area_device_status[][].peripheral_UUID ");
    }

}



// Iniates connection to peripheral device specified before by retrievePeripherals.
- (void) centralManager:(CBCentralManager *)central didRetrievePeripherals:(CBPeripheral *)peripheral
{
    NSLog( @"(6) didRetrievePeripherals");
    [central   connectPeripheral:peripheral   options:nil];
}

首先,我要说的是我是用手机在汽车上写的,因此,请原谅我格式化不当。 我只想指出我所遇到的主要问题。 您没有采用正确的委托方法:

它是:

- (void) centralManager:(CBCentralManager *)central didRetrievePeripherals:(NSArray *) peripherals

不是这个:

- (void) centralManager:(CBCentralManager *)central didRetrievePeripherals:(CBPeripheral *)peripheral

我也看不到你为什么要cfbridgingrelease 只需将其作为@[(id)yourCfuuidref] 您没有创建该cfuuid。

解决方案是存储ASCII UUID,并使用retrieveConnectedPeripherals和retreivePeripherals。 存储指针可能失败,因为未保留数据。 我还实现了tdevoy的解决方案。 didRetrievePeripherals被调用,但是其外围设备列表为空,因此我在其中添加了retrieveConnectedPeripherals和didRetrieveConnectedPeripherals,它们被调用并列出了我成功连接到的外围设备。 (有关这些内容的Apple Prog。指南含糊不清,缺少示例代码。)

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