LC 8 Random crash with QT set the filename of player on OS X

Dar Scott dsc at swcp.com
Thu Jun 2 11:17:32 EDT 2016


I don't think I have a very good understanding of your "loop".  

You seem to have some sort of recursion that will cause your call stack to grow and grow.  it looks as though 1 calls 2 which calls 1 which calls 2 which calls 1 which calls 2 which calls....

At some point anything you do should cause a stack overflow.  This normally would create an error without a crash, but it might be that some operations assume space and will crash.  

If you don't intend the recursion, you might be able to break out the start-from-begining essentials of one command to be called by both commands.  

I'm just guessing here; I don't have a good understanding of what you are doing.  Since this runs fine on W10, I have a feeling that my guess is goofy.  

Dar


> On Jun 2, 2016, at 8:38 AM, Tiemo Hollmann TB <toolbook at kestner.de> wrote:
> 
> Hello,
> 
> OS X 10.11.5, LC 8.0, IDE. Same program runs fine on Windows 10
> 
> I have a pretty nasty issue, where I am right now a bit clueless, in which
> direction I have to search. I have set the dontuseQT of  player "myPlayer"
> to false because I am using old QT videos, which can't be played with AVF.
> 
> In a *videoPlay* handler I *set* the filename of player "myPlayer" to
> tVideoFile, which works fine in all situations and the video is played
> afterwords fine.
> 
> Now I have a pretty deep structure of handlers, as a kind of a loop with the
> modal userdialog and playing a video. The handler with the sheet/modal stack
> waits for some user interactions, calls the *videoPlay* handler and calls
> again the first handler, so that it starts from beginning. In the
> *videoPlay* handler randomly this error occurs, when setting the filename of
> the player object.
> 
> 
> 
> A simplified structure looks like this:
> 
> command1:
> 
> *modal* stack myDialog
> 
>                command2
> 
> 
> 
> command 2:
> 
>                *set* the filename of player -> error
> 
>                command1
> 
>                *modal*stack myDialog
> 
> 
> 
> 
> 
> I have already tried to set a *wait" with messages before the *set* the
> filename, but it still crashes randomly.
> 
> As far as I can see, there are two main differences between the handler,
> where the issue occurs and where not. 1. The deeper structure of handlers
> and 2. The modal stack in between this handler "loop".
> 
> 
> 
> My feeling is that the engine choks somewhere in the "loop", but with
> different handler calls with/without *send* / *dispatch* I would probably
> mess up the "loop" structure.
> 
> 
> 
> Any idea, where to start?
> 
> Thanks
> 
> Tiemo
> 
> 
> 
> 
> 
> 
> 
> 
> 
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