Jim Schram <[EMAIL PROTECTED]> wrote:
> At 9:19 PM -0500 2000/03/13, Roger Chaplin wrote:
> >I'm still waiting to hear the officially legal, sanctioned, and
> >endorsed method of determining the current state of the backlight.
>
> As far as an officially documented and supported API is concerned, there currently
>isn't one. (Bummer, huh!)
>
> However...
>
> Boolean HwrBacklight(Boolean set, Boolean newState)
> HAL_CALL(sysTrapHwrBacklightV33);
>
> works in OS versions prior to 3.5 and remains implemented in 3.5 for backwards
>compatibility even though it has been deprecated. For OS 3.5 and later, this
>specialized trap has been generalized into the following selector-based API:
I found that, and have been using it. I just didn't want to be using
something that is going to disappear in some future version of the OS.
> Err HwrDisplayAttributes(Boolean set, HwrDisplayAttrType attr, void* dataP)
> HAL_CALL(sysTrapHwrDisplayAttributes);
>
> Just pass it the hwrDispBacklight attribute (the 19th enum in a private list of
>attributes) and a pointer to a UInt8 (a Boolean) in OS 3.5 and later. Currently both
>APIs call the same private implementation, though this will likely change in the near
>future as the HwrBacklight trap is about to
be re-purposed.
All right, now I have methods that work for OS <= 3.3, and for OS >=
3.5 (at least for the time being :-) Thank you.
--
Roger Chaplin
<[EMAIL PROTECTED]>
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