IDispatch Data Types and Structures [Automation]

The IDispatch interface uses the following data types and structures. For more information on the implementation of the IDispatch interface see Dispatch Interface and API Functions.

Name	Purpose
BSTR	A pointer to a wide character string.
CALLCONV	Identifies the calling convention used by a member function.
CURRENCY	Provides a precise data type of monetary data.
DECIMAL	Provides a decimal data type.
DISPID	Identifies a method, property, or argument to Invoke.
DISPPARAMS	Contains arguments passed to a method or property.
EXCEPINFO	Describes an error that occurred during Invoke.
INTERFACEDATA	Describes the members of an interface.
LCID	Provides locale information for international string comparisons and localized member names.
METHODDATA	Describes a method or property.
PARAMDATA	Describes a parameter to a method.
VARIANT	When a variant refers to another variant by using the VT_VARIANT | VT_BYREF vartype, the variant being referred to cannot also be of type VT_VARIANT | VT_BYREF.
VARIANTARG	Describes arguments that may be passed within DISPPARAMS.
VARTYPE	Identifies the available variant types.
VARENUM	Used in VARIANT, TYPEDESC, and OLE (ActiveX) property sets.