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CComVariant::CComVariant

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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