Release 10.1A: OpenEdge Development:
Programming Interfaces

Alternate COM data type names

Documentation on COM objects generally specifies COM data type names similar to those shown in Table A–1 and Table A–2. However, some documentation and some COM object viewers might use an alternative nomenclature. Table A–3 shows the most common alternates.

Table A–3: Alternative COM data type names

Alternative name	Common name
VT_ARRAY	Array
VT_BOOL	Boolean
VT_BSTR	String
VT_BYREF	Pointer
VT_BYREF + VT_VARIANT	Variant Pointer
VT_CY	Currency
VT_DATE	Date
VT_DISPATCH	Object (COM)
VT_ERROR	Error Code
VT_I1	Byte
VT_I2	Integer (2-byte integer)
VT_I4	Long (4-byte integer)
VT_PTR	Pointer
VT_PTR + VT_VARIANT	Variant Pointer
VT_R4	Single (Float)
VT_R8	Double
VT_UI1	Unsigned Byte
VT_UI2	Unsigned Short (2-byte integer)
VT_UI4	Unsigned Long (4-byte integer)
VT_UNKNOWN	Object (Base)
VT_VARIANT	Variant (<anytype>)