tagVARIANT、VARIANT、_variant_t和COleVariant
tagVARIANT是一个结构体struct:
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struct tagVARIANT
{ union { struct __tagVARIANT { VARTYPE vt; WORD wReserved1; WORD wReserved2; WORD wReserved3; union { LONG lVal; BYTE bVal; SHORT iVal; FLOAT fltVal; DOUBLE dblVal; VARIANT_BOOL boolVal; _VARIANT_BOOL bool; SCODE scode; CY cyVal; DATE date; BSTR bstrVal; IUnknown __RPC_FAR *punkVal; IDispatch __RPC_FAR *pdispVal; SAFEARRAY __RPC_FAR *parray; BYTE __RPC_FAR *pbVal; SHORT __RPC_FAR *piVal; LONG __RPC_FAR *plVal; FLOAT __RPC_FAR *pfltVal; DOUBLE __RPC_FAR *pdblVal; VARIANT_BOOL __RPC_FAR *pboolVal; _VARIANT_BOOL __RPC_FAR *pbool; SCODE __RPC_FAR *pscode; CY __RPC_FAR *pcyVal; DATE __RPC_FAR *pdate; BSTR __RPC_FAR *pbstrVal; IUnknown __RPC_FAR *__RPC_FAR *ppunkVal; IDispatch __RPC_FAR *__RPC_FAR *ppdispVal; SAFEARRAY __RPC_FAR *__RPC_FAR *pparray; VARIANT __RPC_FAR *pvarVal; PVOID byref; CHAR cVal; USHORT uiVal; ULONG ulVal; INT intVal; UINT uintVal; DECIMAL __RPC_FAR *pdecVal; CHAR __RPC_FAR *pcVal; USHORT __RPC_FAR *puiVal; ULONG __RPC_FAR *pulVal; INT __RPC_FAR *pintVal; UINT __RPC_FAR *puintVal; struct __tagBRECORD { PVOID pvRecord; IRecordInfo __RPC_FAR *pRecInfo; } __VARIANT_NAME_4; } __VARIANT_NAME_3; } __VARIANT_NAME_2; DECIMAL decVal; } __VARIANT_NAME_1; }; |
VARIANT是tagVARIANT的别名:
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typedef /* [wire_marshal] */ struct tagVARIANT VARIANT;
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_variant_t 是VARIANT的包装管理类:
A _variant_t object encapsulates the VARIANT data type.
The class manages resource allocation and deallocation and makes function calls to VariantInit and VariantClear as appropriate.
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//////////////////////////////////////////////////////////////////////////////
// // Wrapper class for VARIANT // ////////////////////////////////////////////////////////////////////////////// /* class _variant_t : public ::tagVARIANT { _variant_t(const VARIANT& varSrc) throw(_com_error); _variant_t(VARIANT& varSrc, bool fCopy) throw(_com_error); // Attach VARIANT if !fCopy _variant_t(short sSrc, VARTYPE vtSrc = VT_I2) throw(_com_error); // Creates a VT_I2, or a VT_BOOL // Destructor // Extractors _variant_t& operator=(short sSrc) throw(_com_error); // Assign a VT_I2, or a VT_BOOL // Comparison operations bool operator!=(const VARIANT& varSrc) const throw(_com_error); // Low-level operations void Attach(VARIANT& varSrc) throw(_com_error); void ChangeType(VARTYPE vartype, const _variant_t* pSrc = NULL) throw(_com_error); void SetString(const char* pSrc) throw(_com_error); // used to set ANSI string |
COleVariant 也是对VARIANT的封装类:
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class COleVariant : public tagVARIANT
{ // Constructors public: COleVariant(); COleVariant(const VARIANT& varSrc); COleVariant(LPCTSTR lpszSrc); COleVariant(BYTE nSrc); COleVariant(float fltSrc); COleVariant(const CByteArray& arrSrc); COleVariant(LPCITEMIDLIST pidl); // Operations BOOL operator==(const VARIANT& varSrc) const; const COleVariant& operator=(const VARIANT& varSrc); const COleVariant& operator=(const LPCTSTR lpszSrc); const COleVariant& operator=(BYTE nSrc); const COleVariant& operator=(float fltSrc); const COleVariant& operator=(const CByteArray& arrSrc); void SetString(LPCTSTR lpszSrc, VARTYPE vtSrc); // used to set ANSI string operator LPVARIANT(); // Implementation |
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