TInt machineId;
HAL::Get(HALData::EMachineUid, machineId);

Knowing machineId you can determin OS version:

enum TMachineID
{
// S60 1st Edition (0.9) Symbian v.6.1
ENokia7650 = 0x101F4FC3
,ENokiaNGage = 0x101F8C19
,ENokiaNGageQD = 0x101FB2B1

// S60 1st Edition, FP1 (1.2) Symbian v.6.1
,ENokia3650 = 0x101F466A
,ENokia3660 = ENokia3650
,ESendoX = 0X101FA031
,ESiemensSX1 = 0x101F9071

// S60 2nd Edition Symbian v.7.0s
,ENokia6600 = 0x101FB3DD

// S60 2nd Edition, FP1 Symbian v.7.0s
,ENokia3230 = 0x10200F97
,ENokia6260 = 0x101FB3F4
,ENokia6620 = 0x101F3EE3
,ENokia6670 = 0x101FB3F3
,ENokia7610 = 0x101FB3F3

// S60 2nd Edition, FP2 Symbian v.8.0a
,ENokia6630 = 0x101FBB55
,ENokia6680 = 0x10200f99
,ENokia6681 = 0x10200F9C
,ENokia6682 = 0x10200F9B

// S60 2nd Edition, FP3 Symbian v.8.1a
,ENokiaN70 = 0x10200F9A
,ENokiaN90 = 0x10200F98

// S60 3rd Edition Symbian v.9.1
,ENokia3250 = 0x200005F8
,ENokiaE60 = 0x20001856
,ENokiaE61 = 0x20001858
,ENokiaE70 = 0x20001857
,ENokiaN71 = 0x200005FF
,ENokiaN73 = 0x200005FB
,ENokiaN80 = 0x200005F9
,ENokiaN91 = 0x200005FC
,ENokiaN92 = 0x200005FA
};

在3rd之前的版本：

TBool GetBluetoothOn()  // BTONOFF
{
 // Create and initialise an RHostResolver
 RHostResolver hr;
 TInt res = false;
 TBool ret;

 RSocketServ socketServer;
 User::LeaveIfError(socketServer.Connect());        
 CleanupClosePushL(socketServer);

 TProtocolDesc pInfo;
 //_LIT(KL2Cap, "BTLinkManager");
 User::LeaveIfError(socketServer.FindProtocol(_L("BTLinkManager"),pInfo));

 res =  hr.Open(socketServer, KBTAddrFamily, pInfo.iProtocol);

 if (KErrNone != res) {
  // if not success, this means bluetooth is not on
  ret = EFalse;
 }

 else
 {
  ret = ETrue; // Bluetooth is already ON
  hr.Close();
 }

 CleanupStack::PopAndDestroy(1); 

 return ret;
}

 

或者

 

RSharedDataClient sd;
sd.Connect(0);
sd.Assign( TUid::Uid( 0x10005952 ) );

 

在3rd里可以这样做：

 

CRepository* cr = CRepository::NewLC( KCRUidBluetoothPowerState );
TInt value;
cr->Get( KBTPowerState, value );
if(value==EBTPowerOn)
    aPower=1;
CleanupStack::PopAndDestroy( cr );

 

 

 

1. 弹出用户确认对话框的方式

头文件中：

RNotifier iNotifier;
 TBTDeviceResponseParamsPckg iNotifierResult;
 TPckgBuf<TBool> pckg;

 

CPP中：

User::LeaveIfError( iNotifier.Connect() );
iNotifier.StartNotifierAndGetResponse(  iStatus,
      KPowerModeSettingNotifierUid,
      pckg,
      iNotifierResult );

 iState = EOpeningBT; 
 SetActive();

 

2.不经过用户确认，自动打开蓝牙

 

对SDK 1.2中的bteng.llib进行reverse engineering，然后使用其中的CBTMCMSettings类

 // turn on Bluetooth in case it was off

CBTMCMSettings settings= CBTMCMSettings::NewL( (MBTMCMSettingsCB*)NULL );  
settings->SetPowerStateL(ETrue,EFalse ); // on, off is (EFalse,EFalse)

 

在3rd中，还有一种办法，理论上也可以开启蓝牙，但由于权限不够，在真机上没有测试成功。

CRepository* cr = CRepository::NewLC( KCRUidBluetoothPowerState );
TInt err = cr->Set(KBTPowerState,EBTPowerOn);

此时在真机上err的值为-46表示没有权限。