DoEvents

[Tyrone W. Lee]

Is there a way to perform a DoEvents call in PB? I am using PB2.0
and I need to return control to the system while a routine is running.


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Explorations v3.0 RPG Development System
http://www.explore-rpg.com

[Sven Blumenstein]

You should use the search engine of this Forum.
You'll find a lot of examples for DoEvents

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[Tom Hanlin]

If you're thinking of a VB-style DoEvents, that's not something you can mimic
readily. VB's design is inside-out with respect to what VB is actually doing.
Essentially, a VB DoEvents is releasing control back to VB's hidden message
loop. In PowerBASIC, you have direct control over the message loop (if any),
so there is no point in a "DoEvents" as such. You just need to break up your
processing during the message loop so as to avoid taking up too much time in
any one cycle.

If your program does not include a message loop, perhaps the Windows API call
Yield is what you want. See your WINAPI.INC include file.

I suspect Sven has 32-bit PB/DLL in mind, which is a somewhat different animal.


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Tom Hanlin
PowerBASIC Staff

[Sven Blumenstein]

>I suspect Sven has 32-bit PB/DLL in mind, which is a somewhat different animal.

Oh, didn't see the "PB 2.0".


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[Wayne Diamond]

SUB DoEvents
    STATIC Msg AS tagMsg
    IF PeekMessage(Msg, %NULL, 0, 0, %PM_REMOVE) THEN
        TranslateMessage Msg
        DispatchMessage Msg
    END IF
END SUB

One of the many snippets in my pbfuncs directory , not sure who wrote that one though


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[John Kovacich]

Would a simple SLEEP 0 perform the trick?

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Thanks,

John Kovacich

[Tom Hanlin]

Wayne, doing a bare message loop in a SUB like that can have assorted
undesireable side-effects -- don't, unless you're sure you know what
you're up to! I'd use LOCAL instead of STATIC there, BTW.

John, good idea, but SLEEP is only available in the 32-bit world.

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Tom Hanlin
PowerBASIC Staff