I just discovered that the Qt development system seems to be in Raspbian by default. I've never delved much into Qt but it seems like a good area to explore -- especially as there might be apps using it in the new Gemini PDA (Debian Linux). Has anybody here played with it, as I seem to be having difficulty with the basics... (:-/) (My Pi is a few years old now, but it chugs away doing useful stuff, so I haven't updated yet. I assume newer Raspians have similar features.) I fired up QtCreator, and -- with some hassles setting up a configuration that worked -- created the default "Hello World" project, built it and was able to run it.. from QtCreator. There is an apparent executable generated, but if I try to run that (from a Terminal) nothing happens! No errors, it just returns. As most of the point of Qt is to build stand-alone apps, I'm a bit lost! Pointers from anyone who's been there would be appreciated. -- Pete --

Huh, I did what I should have done before I posted (:-)) and ran a web search. Sadly I'm now slightly more confused! As I said, the Qt dev package *came* with my Raspian. I can't remember the code name, but the date seems to be Aug 2015. I also forgot to mention that this is Qt4, not 5. All the posts on the web I've been able to find either talk about having to apt-get the package or even more often about cross-compiling from Ubuntu or somewhere. One post did give me the instructions I needed to keep it from itself wanting to cross-compile to a (non-existent) remote device, but my problem of not being able to run the result stand-alone is unchanged. -- Pete --

Qt on the Pi?

Feb 17, 2018 25 Replies

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Pete 8 years ago

If it means updating Raspbian itself, I'm not particularly interested. My Pi runs 24/7 without hiccups doing a few useful things for me (like feeding Radio Caroline to my audio system, and providing a 'reminder' app that's accessible from any of my machines and OSs), so I don't want to 'fix' anything. [htop tells me it's been up 112 days! The exclamation is the program's...]

I've instead just installed qtcreator on my Mint laptop. Not getting all that much further yet -- tells me I don't have a valid 'kit'. with no idea where to find such -- but I suppose I'll get there.

Yeah -- I absolutely refuse auto-updates. (Don't have Windows anywhere around, but I'll have to get used to Android when my Gemini PDA arrives!)

-- Pete --

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A. Dumas 8 years ago

Beauty is you can buy a new SD card (min. 8 GB) for peanuts and swap them to try out the newest Raspbian distribution. Or even buy a new Pi, perhaps a cheap Pi Zero to use as the radio and the one you have (Pi3?) as your dev test bed. If you don't already have a Pi3, then definitely worth it to buy one and use that for development. Massive speed difference. Just wait a week or so until the RPi foundation has celebrated their birthday, on the off-chance they will introduce new hardware which they tend to do around this time. I think a Pi4 is another year away, though.

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druck 8 years ago

Install the build-essential package, go to QtCreator's Tools->Options, make sure gcc is recognised in the compilers tabs, and in the kits tab create default base on gcc.

---druck

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Pete 8 years ago

Thanks, but I'm not sure where I'd find that. Anyway, I did a web search and found a post that said to install qt5-default. That worked, but qmake then failed, so I had to also grab qtdeclarative5-dev to fix that. I think it's working now... I do get pretty fed up with the lack of guidance from the source though. (Or maybe I don't know where to look.)

-- Pete --

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Pete 8 years ago

Swapping the SD removes the Pi's current uses, so that's what I don't want to do!

However a Pi 3 is definitely in my plans. That I haven't bought one yet is just inertia I'm afraid. (:-/)

-- Pete --

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A. Dumas 8 years ago

Only while testing the other setup. What, a couple of hours, a day? Swap it back in and you're right back where you left off.

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