_com_ptr_t::_com_ptr_t

Microsoft Specific

Constructs a _com_ptr_t object.

Syntax

// Default constructor.
// Constructs a NULL smart pointer.
_com_ptr_t() throw();

// Constructs a NULL smart pointer. The NULL argument must be zero.
_com_ptr_t(
   int null
);

// Constructs a smart pointer as a copy of another instance of the
// same smart pointer. AddRef is called to increment the reference
// count for the encapsulated interface pointer.
_com_ptr_t(
   const _com_ptr_t& cp
) throw();

// Move constructor (Visual Studio 2015 Update 3 and later)
_com_ptr_t(_com_ptr_t&& cp) throw();

// Constructs a smart pointer from a raw interface pointer of this
// smart pointer's type. If fAddRef is true, AddRef is called
// to increment the reference count for the encapsulated
// interface pointer. If fAddRef is false, this constructor
// takes ownership of the raw interface pointer without calling AddRef.
_com_ptr_t(
   Interface* pInterface,
   bool fAddRef
) throw();

// Construct pointer for a _variant_t object.
// Constructs a smart pointer from a _variant_t object. The
// encapsulated VARIANT must be of type VT_DISPATCH or VT_UNKNOWN, or
// it can be converted into one of these two types. If QueryInterface
// fails with an E_NOINTERFACE error, a NULL smart pointer is
// constructed.
_com_ptr_t(
   const _variant_t& varSrc
);

// Constructs a smart pointer given the CLSID of a coclass. This
// function calls CoCreateInstance, by the member function
//  CreateInstance, to create a new COM object and then queries for
// this smart pointer's interface type. If QueryInterface fails with
// an E_NOINTERFACE error, a NULL smart pointer is constructed.
explicit _com_ptr_t(
   const CLSID& clsid, 
   IUnknown* pOuter = NULL, 
   DWORD dwClsContext = CLSCTX_ALL
);

// Calls CoCreateClass with provided CLSID retrieved from string.
explicit _com_ptr_t(
   LPCWSTR str, 
   IUnknown* pOuter = NULL, 
   DWORD dwClsContext = CLSCTX_ALL
);

// Constructs a smart pointer given a multibyte character string that
// holds either a CLSID (starting with "{") or a ProgID. This function
// calls CoCreateInstance, by the member function CreateInstance, to
// create a new COM object and then queries for this smart pointer's
// interface type. If QueryInterface fails with an E_NOINTERFACE error,
// a NULL smart pointer is constructed.
explicit _com_ptr_t(
   LPCSTR str,
   IUnknown* pOuter = NULL,
   DWORD dwClsContext = CLSCTX_ALL
);

// Saves the interface.
template<> 
_com_ptr_t(
   Interface* pInterface
) throw();

// Make sure correct ctor is called
template<> 
_com_ptr_t(
   LPSTR str
);

// Make sure correct ctor is called
template<> 
_com_ptr_t(
   LPWSTR str
);

// Constructs a smart pointer from a different smart pointer type or
// from a different raw interface pointer. QueryInterface is called to
// find an interface pointer of this smart pointer's type. If
// QueryInterface fails with an E_NOINTERFACE error, a NULL smart
// pointer is constructed.
template<typename _OtherIID> 
_com_ptr_t(
   const _com_ptr_t<_OtherIID>& p
);

// Constructs a smart-pointer from any IUnknown-based interface pointer.
template<typename _InterfaceType>
_com_ptr_t(
   _InterfaceType* p
);

// Disable conversion using _com_ptr_t* specialization of
// template<typename _InterfaceType> _com_ptr_t(_InterfaceType* p)
template<> 
explicit _com_ptr_t(
   _com_ptr_t* p
);

Parameters

pInterface
A raw interface pointer.

fAddRef
If TRUE, AddRef is called to increment the reference count of the encapsulated interface pointer.

cp
A _com_ptr_t object.

p
A raw interface pointer, its type being different from the smart pointer type of this _com_ptr_t object.

varSrc
A _variant_t object.

clsid
The CLSID of a coclass.

dwClsContext
Context for running executable code.

lpcStr
A multibyte string that holds either a CLSID (starting with "{") or a ProgID.

pOuter
The outer unknown for aggregation.

See also

_com_ptr_t Class