Are all these forms pre-created at app startup?
I hope not, as I have found the dynamic creation and disposal of forms to work
best for me.
If you're not sure if a form is in memory when you try to close it, just do
some checking first to make sure the form needs closing/freeing:
If Assigned(MyTargetForm) then
begin
MyTargetForm.Close;
MyTargetForm.Free;
end;
This way any additional calls you make to close the form won't get executed
because the form will have already been freed.
I hope I understood what you were asking...
Please let me know if this helps, or if not, what I misunderstood...
To: advanced_del...@yahoogroups.comfrom: jer...@ninprodata.comdate: Fri, 2 Jan
2009 17:54:24 -0800Subject: [advanced_delphi] managing multiple forms of mixed
types on close
I’ve been wrestling with this issue for a long time, each time I think I have
it fixed, it stays that way a little while, then someone figures out another
way to blow things up. Here’s the deal:
The app has a main form from which another form is shown non-modally. From
this 2nd form, yet a 3rd form can be shown, also non-modally. When the main
form is closed, there is a bit of code that runs through the open forms and
closes them. The 2nd form has a similar bit of code that cleans up any stray
3rd forms. The problem is, if a user closes the main form when the 2nd form
and its spawned 3rd form(s) are open, I’m closing the 3rd one(s) twice.
Now, I can probably figure out something to work around the problem in this
specific case, but I really think my model is faulty. I need a perfected
pattern, if you will. Has anyone solved this issue or found a pattern that
works? I’ve been experimenting with windows messaging lately, and that really
works well for what it does. And it sounds like it might be a good tool here,
but I haven’t figured out how to apply it yet.
Jeremy
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