>Do you have a timer in your app?

Yes, there's a timer running at the global level to monitor user

activity and shut down the application if it remains idle for a long

period of time. The timer code does not interact with the object

directly, though it will trigger a routine that closes the window

that contains the object if a shutdown proces is started. But the

error did not occur within such a shutdown process.

There's no DOEVENTS in the loop I described, so I would expect that

the FOR .. ENDFOR loop would complete a full iteration before being

interrupted by anything ultimately triggered by the timer.

I do know that VFP sometimes only appears to "become aware" of states

that have changed during a loop when execution gets to the "bottom"

of the loop.

I don't think there's any code within the loop that could remove rows

from the array--I'm aware that's a big no-no, but I will double

check it tomorrow at work.

>Or a bindevent() that may have stopped execution between those lines of code?

No, no bindevents().

Thanks.

Ken

>On March 1, 2017 4:33:22 PM EST, Ken Dibble <krdibble@stny.rr.com> wrote:

> >

> >>Never seen something like this, but if you are distributing an exe,

> >then

> >>you should md5 it so you can detect any change comparing with a saved

> >md5.

> >>

> >>This way I've found viruses that changed parts of the code and

> >antiviruses

> >>have cleaned them up, but leaving the exes in a different state than

> >the

> >>original, sometimes even unrunnable.

> >

> >That's a really good idea.

> >

> >As it turns out, I'm embarrassed to say, the line of code reported in

> >the trace does exist, in a virtually identical list control subclass

> >on the same form (one overlays the other exactly). I wasn't paying

> >attention to the name of the control in which the error occurred.

> >

> >There are actually 10 columns in the array in this method.

> >

> >So what actually happened is that somehow, between:

> >

> >FOR m.x = 1 TO ALEN(THISFORM.oMail.aSortList,1)

> >

> >and

> >

> >thekey = THISFORM.oMail.aSortList(m.x,10)

> >

> >somehow the length of the array got truncated.

> >

> >Now, there is NO other code between those two lines, so

> >ALEN(THISFORM.oMail.aSortList,1) would have had to return an

> >impossible result for the next line to fail.

> >

> >I have seen this on a few occasions when iterating arrays, but I

> >remain mystified as to how it could happen.

> >

> >Ken

> >

> >

>--

>Sent from my Android device with K-9 Mail. Please excuse my brevity.

>

[excessive quoting removed by server]

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