template <class Base>
class CComObjectStack : public Base
Parameters
Base Your class, typically derived from CComObjectRoot or CComObjectRootEx, as well as from any other interface you want to support on the object.
CComObjectStack is used to create a temporary COM object and provide the object a skeletal implementation of IUnknown. Typically, the object is used as a local variable within one function (that is, pushed onto the stack). Since the object is destroyed when the function finishes, reference counting is not performed to increase efficiency.
The following example shows how to create a COM object used inside a function:
void MyFunc ( ) { CComObjectStack<CMyObject> Tempobj; ... }
The temporary object Tempobj is pushed onto the stack and automatically disappears when the function finishes.
#include <atlcom.h>
See Also CComObjectGlobal, CComAggObject, CComObject,
Methods | |
AddRef | Returns zero. In debug mode, calls _ASSERTE. |
CComObjectStack | Constructor. |
QueryInterface | Returns E_NOINTERFACE. In debug mode, calls _ASSERTE. |
Release | Returns zero. In debug mode, calls _ASSERTE. |
Data Members | |
m_hResFinalConstruct | Contains the HRESULT returned during construction of the CComObjectStack object. |
ULONG AddRef( );
Return Value
Returns zero.
Remarks
Returns zero. In debug mode, calls _ASSERTE.
CComObjectStack Overview | Class Members
CComObjectStack( );
Remarks
The constructor. Calls FinalConstruct and then sets m_hResFinalConstruct to the HRESULT returned by FinalConstruct. If you have not derived your base class from CComObjectRoot, you must supply your own FinalConstruct method. The destructor calls FinalRelease.
CComObjectStack Overview | Class Members
See Also CComObjectRootEx::FinalConstruct
HRESULT QueryInterface( REFIID iid, void** ppvObject ) ;
Return Value
Returns E_NOINTERFACE.
Parameters
iid [in] The IID of the interface being requested.
ppvObject [out] A pointer to the interface pointer identified by iid, or NULL if the interface is not found.
Remarks
Returns E_NOINTERFACE. In debug mode, calls _ASSERTE.
CComObjectStack Overview | Class Members
ULONG Release( );
Return Value
Returns zero.
Remarks
Returns zero. In debug mode, calls _ASSERTE.
CComObjectStack Overview | Class Members
HRESULT m_hResFinalConstruct;
Remarks
Contains the HRESULT returned from calling FinalConstruct during construction of the CComObjectStack object.
CComObjectStack Overview | Class Members
See Also CComObjectStack::CComObjectStack, CComObjectRootEx::FinalConstruct