bluetoothadvertiser.cpp

来自「series60 应用程序开发的源代码 series60 应用程序开发的源代码」· C++ 代码 · 共 212 行

/**
*
* @brief Definition of CBluetoothAdvertiser
*
* Copyright (c) EMCC Software Ltd 2003
* @version 1.0
*/

#include <bt_sock.h>
#include "BluetoothAdvertiser.h"
#include "BluetoothDefinitions.h"


// Constants
const TUint KStateFullyUnused = 0xFF;
const TUint KStateFullyUsed   = 0x00;

/**
* Constructor.
* Private constructor.
* @see NewL
* @see NewLC
* @param none
* @return none
**/
CBluetoothAdvertiser::CBluetoothAdvertiser()
: iRecord(0),
  iIsConnected(EFalse)
{
}

/**
* Destructor.
* Stop Advertising and cleanup sessions to Service Discovery Database
* @param none
* @return none
**/
CBluetoothAdvertiser::~CBluetoothAdvertiser()
{
    if (IsAdvertising())
    {
        TRAPD(err,StopAdvertisingL());
    }

    iSdpDatabase.Close();
    iSdpSession.Close();
}

/**
* Factory Constructor.
* Only available way to construct class.
* This function can leave L
* @param none
* @return new instance of the CBluetoothAdvertiser
*/
CBluetoothAdvertiser* CBluetoothAdvertiser::NewL()
{
    CBluetoothAdvertiser* self = CBluetoothAdvertiser::NewLC();
    CleanupStack::Pop(self);
    return self;
}
/**
* Factory Constructor.
* Only available way to construct class.
* This function can leave L.
* @param none
* @return new instance of the CBluetoothAdvertiser, this is also left on the cleanup stack C
*/
CBluetoothAdvertiser* CBluetoothAdvertiser::NewLC()
{
    CBluetoothAdvertiser* self = new (ELeave) CBluetoothAdvertiser();
    CleanupStack::PushL(self);
    self->ConstructL();
    return self;
}

/**
* Second Stage Constructor.
* This function can leave L
* @param none
* @see NewL
* @see NewLC
* @param none
* @return none
*/
void CBluetoothAdvertiser::ConstructL()
{
}

/**
* Connect Method
* If not presently connected open a session on the Service Discovery Database
**/
void CBluetoothAdvertiser::ConnectL()
{
    if (!iIsConnected)
    {
        User::LeaveIfError(iSdpSession.Connect());
        User::LeaveIfError(iSdpDatabase.Open(iSdpSession));
        iIsConnected = ETrue;
    }
}

/**
* Start Advertising.
* Create Service Record, add attributes, and enter into the Service Discovery Database
* @param aPort the port number to advertise
* @return none
**/
void CBluetoothAdvertiser::StartAdvertisingL(TInt aPort)
{
    if (IsAdvertising())
    {
        // could be advertising on a different port
        StopAdvertisingL();
    }
    if (! iIsConnected)
    {
        ConnectL();
    }

    iSdpDatabase.CreateServiceRecordL(KServiceClass, iRecord);

    // add a Protocol to the record
    CSdpAttrValueDES* vProtocolDescriptor = CSdpAttrValueDES::NewDESL(NULL);
    CleanupStack::PushL(vProtocolDescriptor);

    BuildProtocolDescriptionL(vProtocolDescriptor,aPort);

    iSdpDatabase.UpdateAttributeL(iRecord, KSdpAttrIdProtocolDescriptorList, *vProtocolDescriptor);

    CleanupStack::PopAndDestroy(vProtocolDescriptor);

    // Add a name to the record
    iSdpDatabase.UpdateAttributeL(iRecord,
                                  KSdpAttrIdBasePrimaryLanguage+KSdpAttrIdOffsetServiceName,
                                  KServiceName);

    // Add a description to the record
    iSdpDatabase.UpdateAttributeL(iRecord,
                                  KSdpAttrIdBasePrimaryLanguage+KSdpAttrIdOffsetServiceDescription,
                                  KServiceDescription);
}

/**
* Update Availability.
* Toggle function for the availability of Bluetooth Service
* @param aIsAvailable a boolean representing the availablity of the service
* @return none
**/
void CBluetoothAdvertiser::UpdateAvailabilityL(TBool aIsAvailable)
{
    TUint state;
    if (aIsAvailable)
    {
        state = KStateFullyUnused;
    }
    else
    {
        state = KStateFullyUsed;    // Fully used -> can't connect
    }

    // Update the availibility attribute field
    iSdpDatabase.UpdateAttributeL(iRecord, KSdpAttrIdServiceAvailability, state);

    // Mark the record as changed - by increasing its state number (version)
    iSdpDatabase.UpdateAttributeL(iRecord, KSdpAttrIdServiceRecordState, ++iRecordState);
}

/**
* Stop Advertising.
* Used when a connection is made (to avoid multiple connections) or when closing down advertiser
* @param none
* @return none
**/
void CBluetoothAdvertiser::StopAdvertisingL()
{
    if (IsAdvertising())
    {
        iSdpDatabase.DeleteRecordL(iRecord);
        iRecord = 0;
    }
}


/**
* Build Protocol Description.
* Builds the Data Element Sequence for the KSdpAttrIdProtocolDescriptorList attribute of Bluetooth Service record
* @param aProtocolDescriptor a pointer to the protocol descriptor to be populated with data
* @param aPort the port number to advertise
* @return none
**/
void CBluetoothAdvertiser::BuildProtocolDescriptionL(CSdpAttrValueDES* aProtocolDescriptor, TInt aPort)
{
    TBuf8<1> channel;
    channel.Append((TChar)aPort);

    aProtocolDescriptor
    ->StartListL()    // List of protocols required for this method
        ->BuildDESL()
        ->StartListL()    // Details of lowest level protocol
            ->BuildUUIDL(KL2CAP)
        ->EndListL()

        ->BuildDESL()
        ->StartListL()
            ->BuildUUIDL(KRFCOMM)
            ->BuildUintL(channel)
        ->EndListL()
    ->EndListL();
}