Brilliant, thanks very much. Feel a bit silly now as should have seen that!
Checked for the property on formdestroy only at first, which worked.
Then realised I had a massive memory leak so checked for the property in
the formcreate as well and everything works, no leaks.
Thank you for writing that component Luiz, really helpful ;-)
Best regards,
Martin Collins
On 23/05/15 11:27, luiz americo pereira camara wrote:
Check for the property PriorInstanceRunning in FormDestroy
Luiz
2015-05-23 7:12 GMT-03:00 Martin <[email protected]
<mailto:[email protected]>>:
Hi,
Just need a little advice on placement of code please, thanks in
advance.
I wanted my app to have only one instance, so found uniqueinstance
- http://wiki.lazarus.freepascal.org/UniqueInstance (it has the
ability to pass the command line parameters from the second to the
first instance which is something I want but haven't got round to
testing yet!)
There's no problem with uniqueinstance, from reading the source I
think that it's terminating the second instance before the onshow
event of the main form so I'm guessing that the formcreate and
formdestroy events of the main form from the second instance still
occur and that's where I think my problem is.
I am using the formcreate event to parse the command line
arguments to the constructor of my main class, which amongst other
things unzips files to the /tmp directory. I then use the
formdestroy to clean up, deleting the files in the /tmp directory.
If I start a second instance with the same command line parameters
as the first, uniqueinstance terminates the second instance and no
second form is seen on screen. However, all the files are deleted
from /tmp (formdestroy) so they are no longer available to the
first instance so it fails. (I know in a real life situation it
would be unlikely that the second instance would be trying to open
the same files as the first, but not impossible.)
So either I use some form of file locking or keep uniqueinstance
and move my code. I just wanted some advice please, as to where
people on the list would suggest I put the code to parse the
command line parameters to the constructor of my main class and/or
clean up code. I was looking at some of the application events in
the myapp.lpr file but I am not sure if that is the right place?
Any help gratefully received.
Thanks,
Martin Collins
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