Question about launching application itself in a separate thread

[David De Weerdt]

Hi,

First of all, i've posted a similar problem to the fox-mailing list
about a week ago (so before I knew of the existance of TnFOX, now I've
ported to TnFOX but ran into related problems)

I'm wondering how I can accomplish the following:
I want to use COM to start the GUI from a client process. So I have a
COM-server process running that has a launch command which is called
by the COM-client.

this launch command on the server basically looks like:

int launch(int argc, char** argv) {
        FX::FXProcess myprocess(argc, argv);
        FX::TnFXApp application("foo", "bar");
        application.init(argc, argv);
        MyThread primaryLoop(&application);
        return application.run(primaryLoop);
}

but of course this does not return until the application ends. What I
want is that the primaryLoop starts (and thus starts the GUI), the GUI
is kept running and that this launch function still returns.
In the past I did this with putting the application.run method in an
FXThread, but I can not do this in TnFOX anymore.

I think it is trivial what i want to do, but i cannot see how to do it :-)

Thanks for any help,
David De Weerdt


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[Niall Douglas]

On 8 May 2006 at 11:15, David De Weerdt wrote:

> I'm wondering how I can accomplish the following:
> I want to use COM to start the GUI from a client process. So I have a
> COM-server process running that has a launch command which is called
> by the COM-client.
>
> this launch command on the server basically looks like:
>
> int launch(int argc, char** argv) {
>         FX::FXProcess myprocess(argc, argv);
>         FX::TnFXApp application("foo", "bar");
>         application.init(argc, argv);
>         MyThread primaryLoop(&application);
>         return application.run(primaryLoop);
> }
>
> but of course this does not return until the application ends. What I
> want is that the primaryLoop starts (and thus starts the GUI), the GUI
> is kept running and that this launch function still returns.
> In the past I did this with putting the application.run method in an
> FXThread, but I can not do this in TnFOX anymore.
>
> I think it is trivial what i want to do, but i cannot see how to do it :-)

What you could do, and I stress this will only work on Windows, is
run the message pump for MyThread and just not bother for the main
thread.

Therefore, you'd do everything you're doing except that instead of
return application.run(primaryLoop), you'd invoke
primaryLoop.start(true). This will cause launch() to return
immediately, which means FXProcess will get destroyed along with
TnFXApp.

Therefore you need to move those into static FXAutoPtr's so they
persist as long as TnFOX code is running. You should then at some
point before program termination but after the TnFOX code has
finished destroy the TnFXApp and the FXProcess.

If you want some hints on how to do this, look at the code in
Python/converters.cxx which has to temporarily instantiate a
FXProcess when TnFOX is loaded into python as a module and then
correctly deinitialise stuff when it gets kicked out of python. It
uses FXPtrHold rather than FXAutoPtr, but the process is very
similar.

Hope this helps.

Cheers,
Niall





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