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CComVariant::CComVariant

  • Articolo

Each constructor handles the safe initialization of the CComVariant object by calling the VariantInit Win32 function or by setting the object's value and type according to the parameters passed.

CComVariant( ) throw(); 
CComVariant( 
   const CComVariant& varSrc  
); 
CComVariant( 
   const VARIANT& varSrc  
); 
CComVariant( 
   LPCOLESTR lpszSrc  
); 
CComVariant( 
   LPCSTR lpszSrc  
); 
CComVariant( 
   bool bSrc  
); 
CComVariant( 
   BYTE nSrc  
) throw(); 
CComVariant( 
   int nSrc, 
   VARTYPE vtSrc = VT_I4 
) throw(); 
CComVariant( 
   unsigned int nSrc, 
   VARTYPE vtSrc = VT_UI4 
) throw(); 
CComVariant( 
   short nSrc  
) throw(); 
CComVariant( 
   unsigned short nSrc  
) throw(); 
CComVariant( 
   long nSrc, 
   VARTYPE vtSrc = VT_I4  
) throw(); 
CComVariant( 
   unsigned long nSrc  
) throw(); 
CComVariant( 
   LONGLONG nSrc 
) throw(); 
CComVariant( 
   ULONGLONG nSrc 
) throw(); 
CComVariant( 
   float fltSrc  
) throw(); 
CComVariant( 
   double dblSrc, 
   VARTYPE vtSrc = VT_R8  
) throw(); 
CComVariant( 
   CY cySrc  
) throw(); 
CComVariant( 
   IDispatch* pSrc  
) throw(); 
CComVariant( 
   IUnknown* pSrc  
) throw(); 
CComVariant( 
   const SAFEARRAY *pSrc  
); 
CComVariant( 
   char cSrc  
) throw(); 
CComVariant( 
   const CComBSTR& bstrSrc  
);

Parameters

  • varSrc
    [in] The CComVariant or VARIANT used to initialize the CComVariant object. The contents of the source variant are copied to the destination without conversion.

  • lpszSrc
    [in] The character string used to initialize the CComVariant object. You can pass a zero-terminated wide (Unicode) character string to the LPCOLESTR version of the constructor or an ANSI string to the LPCSTR version. In either case the string is converted to a Unicode BSTR allocated using SysAllocString. The type of the CComVariant object will be VT_BSTR.

  • bSrc
    [in] The bool used to initialize the CComVariant object. The bool argument is converted to a VARIANT_BOOL before being stored. The type of the CComVariant object will be VT_BOOL.

  • nSrc
    [in] The int, BYTE, short, long, LONGLONG, ULONGLONG, unsigned short, unsigned long, or unsigned int used to initialize the CComVariant object. The type of the CComVariant object will be VT_I4, VT_UI1, VT_I2, VT_I4, VT_I8, VT_UI8, VT_UI2, VT_UI4, or VT_UI4, respectively.

  • vtSrc
    [in] The type of the variant. When the first parameter is int, valid types are VT_I4 and VT_INT. When the first parameter is long, valid types are VT_I4 and VT_ERROR. When the first parameter is double, valid types are VT_R8 and VT_DATE. When the first parameter is unsigned int, valid types are VT_UI4 and VT_UINT.

  • fltSrc
    [in] The float used to initialize the CComVariant object. The type of the CComVariant object will be VT_R4.

  • dblSrc
    [in] The double used to initialize the CComVariant object. The type of the CComVariant object will be VT_R8.

  • cySrc
    [in] The CY used to initialize the CComVariant object. The type of the CComVariant object will be VT_CY.

  • pSrc
    [in] The IDispatch or IUnknown pointer used to initialize the CComVariant object. AddRef will be called on the interface pointer. The type of the CComVariant object will be VT_DISPATCH or VT_UNKNOWN, respectively.

    Or, the SAFERRAY pointer used to initialize the CComVariant object. A copy of the SAFEARRAY is stored in the CComVariant object. The type of the CComVariant object will be a combination of the original type of the SAFEARRAY and VT_ARRAY.

  • cSrc
    [in] The char used to initialize the CComVariant object. The type of the CComVariant object will be VT_I1.

  • bstrSrc
    [in] The BSTR used to initialize the CComVariant object. The type of the CComVariant object will be VT_BSTR.

Remarks

The destructor manages cleanup by calling CComVariant::Clear.

Requirements

Header: atlcomcli.h

See Also

Reference

CComVariant Class