Data Types

The invoke method of the IDispatch class uses the VARIANT data type to pass properties and return values and method parameters. These variant types are mapped to JADE equivalents for the properties and methods of the generated ActiveX interface classes.

The following table lists the JADE primitive types that are used for each of the VARIANT types.

Variant Type	Description	C++ Type	JADE Primitive Type
VT_I2	2 byte integer	short	Integer
VT_I4	4 byte integer	long	Integer
VT_UI1	Unsigned char	unsigned char	Character
VT_UI2	Unsigned 2 byte integer	unsigned short	Integer
VT_UI4	Unsigned 4 byte integer	unsigned long	Integer
VT_INT	Machine integer	int	Integer
VT_UINT	Machine unsigned integer	unsigned int	Integer
VT_R4	4 byte real	float	Real
VT_R8	8 byte real	double	Real
VT_CY	Currency	CY (__int64)	Decimal
VT_18	8 byte integer	_int64	Decimal
VT_U18	Unsigned 8 byte integer	unsigned _int64	Decimal
VT_BOOL	Boolean	bool	Boolean
VT_ERROR	Error code	long	Integer
VT_DATE	Date	DATE	TimeStamp
VT_BSTR	Binary string	BSTR	String
VT_ARRAY	Safearray pointer	SAFEARRAY	Array
VT_VARIANT	Variant pointer	VARIANT	Any
VT_UNKNOWN	IUnknown pointer	IUnknown	IUnknown
VT_DISPATCH	IDispatch pointer	IDispatch	IDispatch
VT_Decimal	Decimal	No C++ equivalent	Decimal