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variant-t-variant-t.md

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description title ms.date f1_keywords helpviewer_keywords ms.assetid
Learn more about: _variant_t::_variant_t
_variant_t::_variant_t
11/04/2016
_variant_t::_variant_t
_variant_t class [C++], constructor
_variant_t method [C++]
a50e5b33-d4c6-4a26-8e7e-a0a25fd9895b

_variant_t::_variant_t

Microsoft Specific

Constructs a _variant_t object.

Syntax

_variant_t( ) throw( );

_variant_t(
   const VARIANT& varSrc
);

_variant_t(
   const VARIANT* pVarSrc
);

_variant_t(
   const _variant_t& var_t_Src
);

_variant_t(
   VARIANT& varSrc,
   bool fCopy
);

_variant_t(
   short sSrc,
   VARTYPE vtSrc = VT_I2
);

_variant_t(
   long lSrc,
   VARTYPE vtSrc = VT_I4
);

_variant_t(
   float fltSrc
) throw( );

_variant_t(
   double dblSrc,
   VARTYPE vtSrc = VT_R8
);

_variant_t(
   const CY& cySrc
) throw( );

_variant_t(
   const _bstr_t& bstrSrc
);

_variant_t(
   const wchar_t *wstrSrc
);

_variant_t(
   const char* strSrc
);

_variant_t(
   IDispatch* pDispSrc,
   bool fAddRef = true
) throw( );

_variant_t(
   bool bSrc
) throw( );

_variant_t(
   IUnknown* pIUknownSrc,
   bool fAddRef = true
) throw( );

_variant_t(
   const DECIMAL& decSrc
) throw( );

_variant_t(
   BYTE bSrc
) throw( );

variant_t(
   char cSrc
) throw();

_variant_t(
   unsigned short usSrc
) throw();

_variant_t(
   unsigned long ulSrc
) throw();

_variant_t(
   int iSrc
) throw();

_variant_t(
   unsigned int uiSrc
) throw();

_variant_t(
   __int64 i8Src
) throw();

_variant_t(
   unsigned __int64 ui8Src
) throw();

Parameters

varSrc
A VARIANT object to be copied into the new _variant_t object.

pVarSrc
Pointer to a VARIANT object to be copied into the new _variant_t object.

var_t_Src
A _variant_t object to be copied into the new _variant_t object.

fCopy
If false, the supplied VARIANT object is attached to the new _variant_t object without making a new copy by VariantCopy.

ISrc, sSrc
An integer value to be copied into the new _variant_t object.

vtSrc
The VARTYPE for the new _variant_t object.

fltSrc, dblSrc
A numerical value to be copied into the new _variant_t object.

cySrc
A CY object to be copied into the new _variant_t object.

bstrSrc
A _bstr_t object to be copied into the new _variant_t object.

strSrc, wstrSrc
A string to be copied into the new _variant_t object.

bSrc
A bool value to be copied into the new _variant_t object.

pIUknownSrc
COM interface pointer to a VT_UNKNOWN object to be encapsulated into the new _variant_t object.

pDispSrc
COM interface pointer to a VT_DISPATCH object to be encapsulated into the new _variant_t object.

decSrc
A DECIMAL value to be copied into the new _variant_t object.

bSrc
A BYTE value to be copied into the new _variant_t object.

cSrc
A char value to be copied into the new _variant_t object.

usSrc
A unsigned short value to be copied into the new _variant_t object.

ulSrc
A unsigned long value to be copied into the new _variant_t object.

iSrc
An int value to be copied into the new _variant_t object.

uiSrc
An unsigned int value to be copied into the new _variant_t object.

i8Src
An __int64 value to be copied into the new _variant_t object.

ui8Src
An unsigned __int64 value to be copied into the new _variant_t object.

Remarks

  • _variant_t() Constructs an empty _variant_t object, VT_EMPTY.

  • _variant_t( VARIANT& varSrc ) Constructs a _variant_t object from a copy of the VARIANT object. The variant type is retained.

  • _variant_t( VARIANT* pVarSrc ) Constructs a _variant_t object from a copy of the VARIANT object. The variant type is retained.

  • _variant_t( _variant_t& var_t_Src ) Constructs a _variant_t object from another _variant_t object. The variant type is retained.

  • _variant_t( VARIANT& varSrc, bool fCopy ) Constructs a _variant_t object from an existing VARIANT object. If fCopy is false, the VARIANT object is attached to the new object without making a copy.

  • _variant_t( short sSrc, VARTYPE vtSrc = VT_I2 ) Constructs a _variant_t object of type VT_I2 or VT_BOOL from a short integer value. Any other VARTYPE results in an E_INVALIDARG error.

  • _variant_t( long lSrc, VARTYPE vtSrc = VT_I4 ) Constructs a _variant_t object of type VT_I4, VT_BOOL, or VT_ERROR from a long integer value. Any other VARTYPE results in an E_INVALIDARG error.

  • _variant_t( float fltSrc ) Constructs a _variant_t object of type VT_R4 from a float numerical value.

  • _variant_t( double dblSrc, VARTYPE vtSrc = VT_R8 ) Constructs a _variant_t object of type VT_R8 or VT_DATE from a double numerical value. Any other VARTYPE results in an E_INVALIDARG error.

  • _variant_t( CY& cySrc ) Constructs a _variant_t object of type VT_CY from a CY object.

  • *_variant_t( _bstr_t& bstrSrc )* Constructs a _variant_t object of type VT_BSTR from a _bstr_t object. A new BSTR is allocated.

  • _variant_t( wchar_t* wstrSrc ) Constructs a _variant_t object of type VT_BSTR from a Unicode string. A new BSTR is allocated.

  • _variant_t( char* strSrc ) Constructs a _variant_t object of type VT_BSTR from a string. A new BSTR is allocated.

  • _variant_t( bool bSrc ) Constructs a _variant_t object of type VT_BOOL from a bool value.

  • _variant_t( IUnknown* pIUknownSrc, bool fAddRef = true ) Constructs a _variant_t object of type VT_UNKNOWN from a COM interface pointer. If fAddRef is true, then AddRef is called on the supplied interface pointer to match the call to Release that will occur when the _variant_t object is destroyed. It is up to you to call Release on the supplied interface pointer. If fAddRef is false, this constructor takes ownership of the supplied interface pointer; don't call Release on the supplied interface pointer.

  • _variant_t( IDispatch* pDispSrc, bool fAddRef = true ) Constructs a _variant_t object of type VT_DISPATCH from a COM interface pointer. If fAddRef is true, then AddRef is called on the supplied interface pointer to match the call to Release that will occur when the _variant_t object is destroyed. It's up to you to call Release on the supplied interface pointer. If fAddRef is false, this constructor takes ownership of the supplied interface pointer; don't call Release on the supplied interface pointer.

  • _variant_t( DECIMAL& decSrc ) Constructs a _variant_t object of type VT_DECIMAL from a DECIMAL value.

  • _variant_t( BYTE bSrc ) Constructs a _variant_t object of type VT_UI1 from a BYTE value.

END Microsoft Specific

See also

_variant_t Class