Share via

Mapping Visual Basic to Automation

  • Article

Visual Basic provides full support for Automation. The following table lists how Visual Basic statements translate into OLE APIs.

Visual Basic statement

OLE APIs

CreateObject (ProgID)

CLSIDFromProgID

CoCreateInstance

QueryInterface to get IDispatch interface.

GetObject (filename, ProgID)

CLSIDFromProgID

CoCreateInstance

QueryInterface for IPersistFile interface.

Load on IPersistFile interface.

QueryInterface to get IDispatch interface.

GetObject (filename)

CreateBindCtx creates the bind context for the subsequent functions.

MkParseDisplayName returns a moniker handle for BindMoniker.

BindMoniker returns a pointer to the IDispatch interface.

Release on moniker handle.

Release on context.

GetObject (ProgID)

CLSIDFromProgID

GetActiveObject on class ID.

QueryInterface to get IDispatch interface.

Dim x As New interface

Find CLSID for interface.

CoCreateInstance

QueryInterface