[Lazarus] uniqueinstance

[Martin]

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 <mailinglists at collins-email.co.uk 
> <mailto:mailinglists at collins-email.co.uk>>:
>
>     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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