//VARIANT类型是一种复合数据类型；
//以下是VARIANT变量类型所支持的所有的数据类型；
LONGLONG llval; // VT_I8.
LONG lVal; // VT_I4.
BYTE bVal; // VT_UI1.------Unsigned 1-byte character is stored in bVal;
SHORT iVal; // VT_I2.
FLOAT fltVal; // VT_R4.
DOUBLE dblVal; // VT_R8.
VARIANT_BOOL boolVal; // VT_BOOL.
_VARIANT_BOOL bool;
SCODE scode; // VT_ERROR.
CY cyVal; // VT_CY.------A currency value was specified;
DATE date; // VT_DATE.
BSTR bstrVal; // VT_BSTR.------a string was passed;this pointer must be obtained and freed by the BSTR functions
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;
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.------A 1-byte character value is stored in cVal
USHORT uiVal; // VT_UI2.
ULONG ulVal; // VT_UI4.
ULONGLONG ullVal; // VT_UI8.
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;
//A BSTR (Basic string or binary string) is a string data type that is used by COM, Automation, and Interop functions.
