2015-09-29 10:35 GMT-03:00 Michael Van Canneyt <mich...@freepascal.org>:
> > > On Tue, 29 Sep 2015, Juha Manninen wrote: > > On Tue, Sep 29, 2015 at 2:50 PM, Michael Van Canneyt >> <mich...@freepascal.org> wrote: >> >>> I am not proposing to make a new class. >>> I want a property "SingeInstance" in CustApp which activates this >>> automatically. >>> >> >> I had the very same idea when this was discussed a long time ago in >> Lazarus list. >> Martin Friebe noted that every application would then depend on this >> single-instance IPC code. >> It was a valid point. There should not be such a dependency. >> > > For simpleIPC, yes. But the new implementation has no dependencies except > sysutils, classes. So the argument becomes void. > > That's why I was glad with Ondrej's implementation. > > >> The right way is to use a drag-and-drop LCL component like the one >> from Luiz Américo. >> > > That is IMHO a completely wrong implementation for 2 reasons: > > It can be used without the component. The component is just a convenience. See the examples > 1. Using a LCL component means that you must instantiate a form/datamodule > first. > By that time, a database connection may already have been made (just > to name something), which is exactly what you want to avoid. > > > The check for single instance should be done before the first form is > created. > It can be done > > 2. Then it is only available in visually designed applications. > Services, website servers and custom console apps are non-visual. > I am specificially thinking FastCGI processes. > > See above > All these have in common that they descend from TCustomApplication. > > And console apps without TCustomApplication? Luiz
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