_variant_t::_variant_t

The latest version of this topic can be found at _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; do not 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 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; do not 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

通过

_variant_t::_variant_t

Syntax

Parameters

Remarks

See Also

其他资源