Returning True in Window.CancelClose not working

General
1

Normally returning true in Window.CancelClose should stop the window from closing, and also stop the App from quitting.

I have a project here in which I’m returning True in this event, and it’s not stopping anything. The app just quits every time, no matter what I return here.

Under what circumstance would this happen? I’ve looked around for other calls to close or quit, and can’t find any. What’s going on?

Thanks.

2

My guess is it’s not really returning True where you think it is. Did you try setting a breakpoint to make sure?

3

Yes, I set a breakpoint, and it was returning True where it should, at the end of that event.

I didn’t trust that and just commented it all out and wrote RETURN TRUE at the top of the event. Same result.

4

Hmmm… Did you trace past that to make sure some super class isn’t overriding the result?

5

I did, and didn’t see anything suspect. The Window IS indeed one of my own classes. Implicit Instance is OFF.

6

Could it be a silent crash ?

7

Is a silent crash traceable somehow?

My Window class does have code in its CancelClose event, which calls a shadowed CancelClose event as follows:

me.IsClosing = not RaiseEvent CancelClose( appQuitting )

I set this flag IsClosing in order to suppress the Activate event from firing during close (the event fires on Mac during the close sequence when the user closes a modal dialog in the window)

8

Is it illegal to shadow the CancelClose event? (I hope what I’m asking is clear?)

9

OH, DUH!!! Gosh, how embarrassing.

I forgot to return a value in the class’s CancelClose event!

return not  me.IsClosing

So in my class I need

  me.IsClosing = not RaiseEvent CancelClose( appQuitting )
  return not me.IsClosing

This is one of those times I wish the IDE would tell me when I haven’t returned a value.

Thank you Kem for the winning clue. It was staring me in the face and I just didn’t see it.

10

We’ve all been there.