[問題] 跳出cannot instantiate abstract class
請問我在CreateBulkPipe的return new CBulkPipe(xxx)跳出下面錯誤 請問有人知道是什
麼問題嗎 謝謝
error C2259: 'CBulkPipe' : cannot instantiate abstract class
如下圖,太多參數我就打xxxx
Cpipe.cpp:
CBulkPipe::CBulkPipe(xxxxx)
: CQueuedPipe(xxxx) // constructor for base class
{
DEBUGMSG( ZONE_PIPE && ZONE_VERBOSE, (TEXT("+CBulkPipe::CBulkPipe\n")) );
DEBUGCHK( !fIsLowSpeed ); // bulk pipe must be high speed
DEBUGMSG( ZONE_PIPE && ZONE_VERBOSE, (TEXT("-CBulkPipe::CBulkPipe\n")) );
}
CBulkPipe::~CBulkPipe( )
{
DEBUGMSG( ZONE_PIPE && ZONE_VERBOSE, (TEXT("+CBulkPipe::~CBulkPipe\n")) );
ClosePipe();
DEBUGMSG( ZONE_PIPE && ZONE_VERBOSE, (TEXT("-CBulkPipe::~CBulkPipe\n")) );
}
BOOL CBulkPipe::RemoveQHeadFromQueue()
{
ASSERT(m_pPipeQHead);
return (m_pCEhcd->AsyncDequeueQH( m_pPipeQHead )!=NULL);
}
BOOL CBulkPipe::InsertQHeadToQueue()
{
ASSERT(m_pPipeQHead);
return (m_pCEhcd->AsyncQueueQH( m_pPipeQHead )!=NULL);
}
CPipeAbs * CreateBulkPipe(xxxx)
{
return new
CBulkPipe(lpEndpointDescriptor,fIsLowSpeed,fIsHighSpeed,bDeviceAddress,bHubAddress,bHubPort,ttContext,(CEhcd
* const)pChcd);
//!!!!!這邊跳出錯誤 error C2259: 'CBulkPipe' : cannot instantiate
abstract class
}
----------------------------------------------------------------------------------------------------
class CPipeAbs { // Abstract Pipe class.
public:
CPipeAbs(UCHAR const
bEndpointAddress):m_bEndpointAddress(bEndpointAddress) {;};
virtual ~CPipeAbs() {;};
virtual HCD_REQUEST_STATUS OpenPipe( void ) = 0;
virtual HCD_REQUEST_STATUS ClosePipe( void ) = 0;
virtual HCD_REQUEST_STATUS IssueTransfer( xxx)=0;
virtual HCD_REQUEST_STATUS AbortTransfer( xxx ) = 0;
virtual HCD_REQUEST_STATUS IsPipeHalted( OUT LPBOOL const lpbHalted )=0;
virtual void ClearHaltedFlag( void )=0;
virtual void ResetEndPoint(void) = 0;
virtual void ChangeMaxPacketSize( IN const USHORT ) {ASSERT(FALSE);};
virtual BOOL SetReservedDeviceAddr(UCHAR bReservedDeviceAddr)=0;
virtual UCHAR GetReservedDeviceAddr()=0;
UCHAR const m_bEndpointAddress;
};
CPipeAbs * CreateBulkPipe(xxx);
CPipeAbs * CreateControlPipe(xxx);
CPipeAbs * CreateInterruptPipe(xxx);
CPipeAbs * CreateIsochronousPipe(xxx);}
----------------------------------------------------------------------------------------------------------
Cpipe.h:
class CBulkPipe : public CQueuedPipe
{
public:
CBulkPipe(xxxxx);
~CBulkPipe();
virtual PIPE_TYPE GetType () { return TYPE_BULK; };
HCD_REQUEST_STATUS OpenPipe( void );
HCD_REQUEST_STATUS ClosePipe( void );
protected :
virtual BOOL RemoveQHeadFromQueue();
virtual BOOL InsertQHeadToQueue() ;
private:
BOOL AreTransferParametersValid( const STransfer *pTransfer = NULL )
const;
};
--
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