tagVARIANT是一个结构体struct：
C++ Code： tagVARIANT
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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：
C++ Code：VARIANT
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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.
C++ Code： _variant_t类
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//////////////////////////////////////////////////////////////////////////////
// // Wrapper class for VARIANT // ////////////////////////////////////////////////////////////////////////////// /* * VARENUM usage key, * * * [V] - may appear in a VARIANT * * [T] - may appear in a TYPEDESC * * [P] - may appear in an OLE property set * * [S] - may appear in a Safe Array * * [C] - supported by class _variant_t * * * VT_EMPTY [V] [P] nothing * VT_NULL [V] [P] SQL style Null * VT_I2 [V][T][P][S][C] 2 byte signed int * VT_I4 [V][T][P][S][C] 4 byte signed int * VT_R4 [V][T][P][S][C] 4 byte real * VT_R8 [V][T][P][S][C] 8 byte real * VT_CY [V][T][P][S][C] currency * VT_DATE [V][T][P][S][C] date * VT_BSTR [V][T][P][S][C] OLE Automation string * VT_DISPATCH [V][T][P][S][C] IDispatch * * VT_ERROR [V][T] [S][C] SCODE * VT_BOOL [V][T][P][S][C] True=-1, False=0 * VT_VARIANT [V][T][P][S] VARIANT * * VT_UNKNOWN [V][T] [S][C] IUnknown * * VT_DECIMAL [V][T] [S][C] 16 byte fixed point * VT_I1 [T] signed char * VT_UI1 [V][T][P][S][C] unsigned char * VT_UI2 [T][P] unsigned short * VT_UI4 [T][P] unsigned short * VT_I8 [T][P] signed 64-bit int * VT_UI8 [T][P] unsigned 64-bit int * VT_INT [T] signed machine int * VT_UINT [T] unsigned machine int * VT_VOID [T] C style void * VT_HRESULT [T] Standard return type * VT_PTR [T] pointer type * VT_SAFEARRAY [T] (use VT_ARRAY in VARIANT) * VT_CARRAY [T] C style array * VT_USERDEFINED [T] user defined type * VT_LPSTR [T][P] null terminated string * VT_LPWSTR [T][P] wide null terminated string * VT_FILETIME [P] FILETIME * VT_BLOB [P] Length prefixed bytes * VT_STREAM [P] Name of the stream follows * VT_STORAGE [P] Name of the storage follows * VT_STREAMED_OBJECT [P] Stream contains an object * VT_STORED_OBJECT [P] Storage contains an object * VT_BLOB_OBJECT [P] Blob contains an object * VT_CF [P] Clipboard format * VT_CLSID [P] A Class ID * VT_VECTOR [P] simple counted array * VT_ARRAY [V] SAFEARRAY* * VT_BYREF [V] void* for local use */ class _variant_t : public ::tagVARIANT { public: // Constructors // _variant_t() throw(); _variant_t(const VARIANT& varSrc) throw(_com_error); _variant_t(const VARIANT* pSrc) throw(_com_error); _variant_t(const _variant_t& 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 _variant_t(long lSrc, VARTYPE vtSrc = VT_I4) throw(_com_error); // Creates a VT_I4, a VT_ERROR, or a VT_BOOL _variant_t(float fltSrc) throw(); // Creates a VT_R4 _variant_t(double dblSrc, VARTYPE vtSrc = VT_R8) throw(_com_error); // Creates a VT_R8, or a VT_DATE _variant_t(const CY& cySrc) throw(); // Creates a VT_CY _variant_t(const _bstr_t& bstrSrc) throw(_com_error); // Creates a VT_BSTR _variant_t(const wchar_t *pSrc) throw(_com_error); // Creates a VT_BSTR _variant_t(const char* pSrc) throw(_com_error); // Creates a VT_BSTR _variant_t(IDispatch* pSrc, bool fAddRef = true) throw(); // Creates a VT_DISPATCH _variant_t(bool bSrc) throw(); // Creates a VT_BOOL _variant_t(IUnknown* pSrc, bool fAddRef = true) throw(); // Creates a VT_UNKNOWN _variant_t(const DECIMAL& decSrc) throw(); // Creates a VT_DECIMAL _variant_t(BYTE bSrc) throw(); // Creates a VT_UI1 // Destructor // ~_variant_t() throw(_com_error); // Extractors // operator short() const throw(_com_error); // Extracts a short from a VT_I2 operator long() const throw(_com_error); // Extracts a long from a VT_I4 operator float() const throw(_com_error); // Extracts a float from a VT_R4 operator double() const throw(_com_error); // Extracts a double from a VT_R8 operator CY() const throw(_com_error); // Extracts a CY from a VT_CY operator _bstr_t() const throw(_com_error); // Extracts a _bstr_t from a VT_BSTR operator IDispatch*() const throw(_com_error); // Extracts a IDispatch* from a VT_DISPATCH operator bool() const throw(_com_error); // Extracts a bool from a VT_BOOL operator IUnknown*() const throw(_com_error); // Extracts a IUnknown* from a VT_UNKNOWN operator DECIMAL() const throw(_com_error); // Extracts a DECIMAL from a VT_DECIMAL operator BYTE() const throw(_com_error); // Extracts a BTYE (unsigned char) from a VT_UI1 // Assignment operations // _variant_t& operator=(const VARIANT& varSrc) throw(_com_error); _variant_t& operator=(const VARIANT* pSrc) throw(_com_error); _variant_t& operator=(const _variant_t& varSrc) throw(_com_error); _variant_t& operator=(short sSrc) throw(_com_error); // Assign a VT_I2, or a VT_BOOL _variant_t& operator=(long lSrc) throw(_com_error); // Assign a VT_I4, a VT_ERROR or a VT_BOOL _variant_t& operator=(float fltSrc) throw(_com_error); // Assign a VT_R4 _variant_t& operator=(double dblSrc) throw(_com_error); // Assign a VT_R8, or a VT_DATE _variant_t& operator=(const CY& cySrc) throw(_com_error); // Assign a VT_CY _variant_t& operator=(const _bstr_t& bstrSrc) throw(_com_error); // Assign a VT_BSTR _variant_t& operator=(const wchar_t* pSrc) throw(_com_error); // Assign a VT_BSTR _variant_t& operator=(const char* pSrc) throw(_com_error); // Assign a VT_BSTR _variant_t& operator=(IDispatch* pSrc) throw(_com_error); // Assign a VT_DISPATCH _variant_t& operator=(bool bSrc) throw(_com_error); // Assign a VT_BOOL _variant_t& operator=(IUnknown* pSrc) throw(_com_error); // Assign a VT_UNKNOWN _variant_t& operator=(const DECIMAL& decSrc) throw(_com_error); // Assign a VT_DECIMAL _variant_t& operator=(BYTE bSrc) throw(_com_error); // Assign a VT_UI1 // Comparison operations // bool operator==(const VARIANT& varSrc) const throw(_com_error); bool operator==(const VARIANT* pSrc) const throw(_com_error); bool operator!=(const VARIANT& varSrc) const throw(_com_error); bool operator!=(const VARIANT* pSrc) const throw(_com_error); // Low-level operations // void Clear() throw(_com_error); void Attach(VARIANT& varSrc) throw(_com_error); VARIANT Detach() 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：
C++ Code：COleVariant类
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class COleVariant : public tagVARIANT
{ // Constructors public: COleVariant(); COleVariant(const VARIANT& varSrc); COleVariant(LPCVARIANT pSrc); COleVariant(const COleVariant& varSrc); COleVariant(LPCTSTR lpszSrc); COleVariant(LPCTSTR lpszSrc, VARTYPE vtSrc); // used to set to ANSI string COleVariant(CString& strSrc); COleVariant(BYTE nSrc); COleVariant(short nSrc, VARTYPE vtSrc = VT_I2); COleVariant(long lSrc, VARTYPE vtSrc = VT_I4); COleVariant(const COleCurrency& curSrc); COleVariant(float fltSrc); COleVariant(double dblSrc); COleVariant(const COleDateTime& timeSrc); COleVariant(const CByteArray& arrSrc); COleVariant(const CLongBinary& lbSrc); COleVariant(LPCITEMIDLIST pidl); // Operations public: void Clear(); void ChangeType(VARTYPE vartype, LPVARIANT pSrc = NULL); void Attach(VARIANT& varSrc); VARIANT Detach(); BOOL operator==(const VARIANT& varSrc) const; BOOL operator==(LPCVARIANT pSrc) const; const COleVariant& operator=(const VARIANT& varSrc); const COleVariant& operator=(LPCVARIANT pSrc); const COleVariant& operator=(const COleVariant& varSrc); const COleVariant& operator=(const LPCTSTR lpszSrc); const COleVariant& operator=(const CString& strSrc); const COleVariant& operator=(BYTE nSrc); const COleVariant& operator=(short nSrc); const COleVariant& operator=(long lSrc); const COleVariant& operator=(const COleCurrency& curSrc); const COleVariant& operator=(float fltSrc); const COleVariant& operator=(double dblSrc); const COleVariant& operator=(const COleDateTime& dateSrc); const COleVariant& operator=(const CByteArray& arrSrc); const COleVariant& operator=(const CLongBinary& lbSrc); void SetString(LPCTSTR lpszSrc, VARTYPE vtSrc); // used to set ANSI string operator LPVARIANT(); operator LPCVARIANT() const; // Implementation public: ~COleVariant(); void _ClearCompat(); }; |