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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 |