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hmm.. a quick solution for me would be to:

  if Wait(seconds) then do return end
  ShowFrame()
  ...

Injecting the 'return' does not seem very nice.
What you really need is exceptions ála Lua. Consider putting the whole thing into do-end and then breaking (but I think this isn't much different from the above): 

  do
    if Wait(seconds) then do break end
    ShowFrame()
    ...
  end
  -- break takes here
Could 'ShowFrame' itself (inside) check for the abort flag and pass through automatically if it's on? 

-ak


13.4.2004 kello 18:10, Matthew Harmon kirjoitti:

 Hey all:
I've implemented a simple slideshow engine in C and exposed control through Lua. So, C is "in charge", but the slideshow is described in Lua. Now, I want to let the user abort the rest of the slideshow via a keypress from the 
C side, but I'm not sure how to best handle this.

A script essentially looks like this:

function Slideshow()
  Initialize()
  DoSlideshow()
  Cleanup()
  end

function DoSlideshow()
  ShowFrame()
  Wait(seconds)
  ShowFrame()
  Wait(seconds)
  ...
  end
I figured I could just return from DoSlideshow() upon a user signal and then execute whatever cleanup code I need. But I'm not sure how best to do this. 

- Can I "inject" a return into the script via C? (dostring or something
similar)
- Or, do I have to abort my wait and then check a value like this:

  Wait(seconds)
  if (GetAbortFlag() == 1) then
    do return end
  ShowFrame()
  ...
That's a lot of code for the slideshow authors to have to include for each frame of the show and seems a little messy. (BTW: the slideshow is in a coroutine that yields upon calling Wait() so the game can continue looping.) 

Any ideas?