CComObjectStack Class

 

The latest version of this topic can be found at CComObjectStack Class.

This class creates a temporary COM object and provides it with a skeletal implementation of IUnknown.

Syntax

template <class  Base>  
class CComObjectStack
 : public Base

Parameters

Base
Your class, derived from CComObjectRoot or CComObjectRootEx, as well as from any other interface you want to support on the object.

Members

Public Constructors

Name	Description
CComObjectStack::CComObjectStack	The constructor.
CComObjectStack::~CComObjectStack	The destructor.

Public Methods

Name	Description
CComObjectStack::AddRef	Returns zero. In debug mode, calls _ASSERTE.
CComObjectStack::QueryInterface	Returns E_NOINTERFACE. In debug mode, calls _ASSERTE.
CComObjectStack::Release	Returns zero. In debug mode, calls _ASSERTE. ~

Public Data Members

Name	Description
CComObjectStack::m_hResFinalConstruct	Contains the HRESULT returned during construction of the CComObjectStack object.

Remarks

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<CMyClass2> Tempobj;
   //...
}

The temporary object Tempobj is pushed onto the stack and automatically disappears when the function finishes.

Inheritance Hierarchy

Base

CComObjectStack

Requirements

Header: atlcom.h

CComObjectStack::AddRef

Returns zero.

STDMETHOD_(ULONG, AddRef)();

Return Value

Returns zero.

Remarks

In debug mode, calls _ASSERTE.

CComObjectStack::CComObjectStack

The constructor.

CComObjectStack(void* = NULL);

Remarks

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::~CComObjectStack

The destructor.

CComObjectStack();

Remarks

Frees all allocated resources and calls FinalRelease.

CComObjectStack::m_hResFinalConstruct

Contains the HRESULT returned from calling FinalConstruct during construction of the CComObjectStack object.

HRESULT m_hResFinalConstruct;

CComObjectStack::QueryInterface

Returns E_NOINTERFACE.

HRESULT QueryInterface(REFIID, void**);

Return Value

Returns E_NOINTERFACE.

Remarks

In debug mode, calls _ASSERTE.

CComObjectStack::Release

Returns zero.

STDMETHOD_(ULONG, Release)();

Return Value

Returns zero.

Remarks

In debug mode, calls _ASSERTE.

See Also

CComAggObject Class
CComObject Class
CComObjectGlobal Class
Class Overview