Check for the property PriorInstanceRunning in FormDestroy Luiz
2015-05-23 7:12 GMT-03:00 Martin <[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 > > -- > _______________________________________________ > Lazarus mailing list > [email protected] > http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus >
-- _______________________________________________ Lazarus mailing list [email protected] http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
