常用的tagVARIANT结构【整理】

 　　VARIANT数据结构包含两个域(如果不考虑保留的域)。vt域描述了第二个域的数据类型。为了使多种类型能够在第二个域中出现，我们定义了一个联合结构。所以，第二个域的名称随着vt域中输入值的不同而改变。用于指定vt域值情况的常量在联合的定义中以每一行的注释形式给出。

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typedef struct tagVARIANT VARIANT; typedef struct tagVARIANT VARIANTARG; struct tagVARIANT {       union {           struct __tagVARIANT {               VARTYPE vt;               WORD    wReserved1;               WORD    wReserved2;               WORD    wReserved3;               union {                   ULONGLONG     ullVal;       /* VT_UI8               */                   LONGLONG      llVal;        /* VT_I8                */                   LONG          lVal;         /* VT_I4                */                   BYTE          bVal;         /* VT_UI1               */                   SHORT         iVal;         /* VT_I2                */                   FLOAT         fltVal;       /* VT_R4                */                   DOUBLE        dblVal;       /* VT_R8                */                   VARIANT_BOOL  boolVal;      /* VT_BOOL              */                   _VARIANT_BOOL bool;         /* (obsolete)           */                   SCODE         scode;        /* VT_ERROR             */                   CY            cyVal;        /* VT_CY                */                   DATE          date;         /* VT_DATE              */                   BSTR          bstrVal;      /* VT_BSTR              */                   IUnknown *    punkVal;      /* VT_UNKNOWN           */                   IDispatch *   pdispVal;     /* VT_DISPATCH          */                   SAFEARRAY *   parray;       /* VT_ARRAY             */                   BYTE *        pbVal;        /* VT_BYREF|VT_UI1      */                   SHORT *       piVal;        /* VT_BYREF|VT_I2       */                   LONG *        plVal;        /* VT_BYREF|VT_I4       */                   LONGLONG *    pllVal;       /* VT_BYREF|VT_I8       */                   FLOAT *       pfltVal;      /* VT_BYREF|VT_R4       */                   DOUBLE *      pdblVal;      /* VT_BYREF|VT_R8       */                   VARIANT_BOOL *pboolVal;     /* VT_BYREF|VT_BOOL     */                   _VARIANT_BOOL *pbool;       /* (obsolete)           */                   SCODE *       pscode;       /* VT_BYREF|VT_ERROR    */                   CY *          pcyVal;       /* VT_BYREF|VT_CY       */                   DATE *        pdate;        /* VT_BYREF|VT_DATE     */                   BSTR *        pbstrVal;     /* VT_BYREF|VT_BSTR     */                   IUnknown **   ppunkVal;     /* VT_BYREF|VT_UNKNOWN  */                   IDispatch **  ppdispVal;    /* VT_BYREF|VT_DISPATCH */                   SAFEARRAY **  pparray;      /* VT_BYREF|VT_ARRAY    */                   VARIANT *     pvarVal;      /* VT_BYREF|VT_VARIANT  */                   PVOID         byref;        /* Generic ByRef        */                   CHAR          cVal;         /* VT_I1                */                   USHORT        uiVal;        /* VT_UI2               */                   ULONG         ulVal;        /* VT_UI4               */                   INT           intVal;       /* VT_INT               */                   UINT          uintVal;      /* VT_UINT              */                   DECIMAL *     pdecVal;      /* VT_BYREF|VT_DECIMAL  */                   CHAR *        pcVal;        /* VT_BYREF|VT_I1       */                   USHORT *      puiVal;       /* VT_BYREF|VT_UI2      */                   ULONG *       pulVal;       /* VT_BYREF|VT_UI4      */                   ULONGLONG *   pullVal;      /* VT_BYREF|VT_UI8      */                   INT *         pintVal;      /* VT_BYREF|VT_INT      */                   UINT *        puintVal;     /* VT_BYREF|VT_UINT     */                   struct __tagBRECORD {                       PVOID         pvRecord;                       IRecordInfo * pRecInfo;                   } __VARIANT_NAME_4;         /* VT_RECORD            */               } __VARIANT_NAME_3;           } __VARIANT_NAME_2;              DECIMAL decVal;       } __VARIANT_NAME_1;   };