CComVariant Class

Articolo
04/24/2015

This class wraps the VARIANT type, providing a member indicating the type of data stored.

class CComVariant : public tagVARIANT

Members

Public Constructors

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

Public Methods

Name	Description
CComVariant::Attach	Attaches a VARIANT to the CComVariant object.
CComVariant::ChangeType	Converts the CComVariant object to a new type.
CComVariant::Clear	Clears the CComVariant object.
CComVariant::Copy	Copies a VARIANT to the CComVariant object.
CComVariant::CopyTo	Copies the contents of the CComVariant object.
CComVariant::Detach	Detaches the underlying VARIANT from the CComVariant object.
CComVariant::GetSize	Returns the size in number of bytes of the contents of the CComVariant object.
CComVariant::ReadFromStream	Loads a VARIANT from a stream.
CComVariant::SetByRef	Initializes the CComVariant object and sets the vt member to VT_BYREF.
CComVariant::WriteToStream	Saves the underlying VARIANT to a stream.

Public Operators

CComVariant::operator <	Indicates whether the CComVariant object is less than the specified VARIANT.
CComVariant::operator >	Indicates whether the CComVariant object is greater than the specified VARIANT.
operator !=	Indicates whether the CComVariant object does not equal the specified VARIANT.
operator =	Assigns a value to the CComVariant object.
operator ==	Indicates whether the CComVariant object equals the specified VARIANT.

Remarks

CComVariant wraps the VARIANT and VARIANTARG type, which consists of a union and a member indicating the type of the data stored in the union. VARIANTs are typically used in Automation.

CComVariant derives from the VARIANT type so it can be used wherever a VARIANT can be used. You can, for example, use the V_VT macro to extract the type of a CComVariant or you can access the vt member directly just as you can with a VARIANT.

Inheritance Hierarchy

tagVARIANT

CComVariant

Requirements

Header: atlcomcli.h

Condividi tramite