QThread and QProcess problem

**marcel** · 31st July 2007, 21:53

Of who's update are you talking about? The list box?

I was thinking more like: you have a list of songs( QList, whatever). This should behave like an external model for the list box. That is when you add an item, you update the list, and as a result of this the widget will get updated also.

You should have a few functions for accessing the list's contents.
Reading and writing to the list should be guarded with a mutex.

You also could add a remove item function which you *call* from the thread when the current song ends. By call I mean emitting a signal from the thread.

But I guess there are other methods. You should choose the one that feels more scalable to you, since I assume your application is just at its beginning, and it will get more complex.

Regards

**codebehind** · 31st July 2007, 22:09

I was talking about the update of the main widget but i haven't thought about the signal and slot way of communication...
i haven't worked with that (excluding the tutor of course) so i'll try it... something new to experiment. it sounds interesting.

**marcel** · 31st July 2007, 22:11

This is the way it is recommended to be done in Qt4. Should work in 3 also.

BTW, why don't you switch to v4? It has a lot of new things...Can't even be compared to 3.

Regards

**codebehind** · 31st July 2007, 22:40

i really don't know. i haven't read the specification for the minimum HW that it works on??
i have a 900 MHz Duron and 512 MB RAM
at my job i have a 3GHz and 1GB RAM and working with vs2005 and it is slow!

**marcel** · 31st July 2007, 22:46

Originally Posted by codebehind

i really don't know. i haven't read the specification for the minimum HW that it works on??
i have a 900 MHz Duron and 512 MB RAM
at my job i have a 3GHz and 1GB RAM and working with vs2005 and it is slow!

Slow in what way? When you compile Qt4 apps? I think it can't get better than that.
My last Qt project( at work ), was taking about 15-20 minutes to compile, on a similar computer( 3ghz, 2gb mem). But it was pretty big.

Ultimately your application's requirements dictate the resources to use.
Qt4 is in many ways faster than 3.

Regards

**codebehind** · 31st July 2007, 23:04

slow in the way of working with it! a few open windows and let say two studios and explorer and IBrowser (Firefox), task manager and a DB Tool (AQT) and MicrosoftExchange... and it needs some time to change between app. That i mean for slow. compile time is fast in front of switching betwin app.

anyway i started to download Qt4, will see!