Smalltalk - [VW 7.1] Callbacks

Author

[VW 7.1] Callbacks

stalk

2005-06-03, 3:58 am

Can I register with a DLL for callbacks?

For instance, a DLL provides a service to clients that want to know when a
file arrives in an archive. Can I use the DLL from within VW to register
interest and receive notification?

Reinout Heeck

2005-06-03, 9:08 am

stalk wrote:
> Can I register with a DLL for callbacks?
>
> For instance, a DLL provides a service to clients that want to know when a
> file arrives in an archive. Can I use the DLL from within VW to register
> interest and receive notification?
>
>

Yes.
In your docs in the DLLandCConnectGuide.pdf chapter 4 is devoted to
'Calling Smalltalk from C' this includes setting up callbacks.

It is all pretty straightforward:

Declare it:
1) In DLLCC declare the signature of the registered user function
2) declare the signature of the C callback registration function.

Use it:
3) pass a Smalltalk block to that registration function.
4) do stuff so it gets called....

And yes, you can put a 'self halt' in the registered callback :-)))

R
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