Okay, I'm trying to implement fast switching on my app, and if I don't have to execute any background code / save any user data, do I really even need to do anything ? Or do I just upgd to iPhone SDK 4.0, click compile, and deploy?
Is there any way to simulate an out of memory exception, make the OS purge the application to test how it's being relaunched?
Thanks,
Teja.
If all you want is fast-user switching, I found that recompiling with the iOS4 SDK is sufficient in order to make your app 'fast-switch ready.' You just need to make sure your app can deal with memory warnings and being able to restore any data you had to release as a result of a memory warning.
The easiest way to simulate a memory warning is through the iPhone simulator, under Hardware -> Simulate Memory Warning. Personally, I used the Mac OSX Keyboard preferences to set a hot-key for that menu item so I can quickly simulate memory warnings on my app.
Related
My app is having tearing problems when I scroll fast horizontally. Normally I'd just enable vsync, but I don't know how to do that in Qt. The tearing is occurring on my dev PC which runs Linux with a X-server, but it will also need to work well on the target system which is either Android or Linux+EGLFS.
One google result was from the Qt4 era and said that the tearing will be gone in Qt 5. But apparently it isn't.
Many google results are about env vars for embedded linux systems, such as QT_QPA_EGLFS_FORCEVSYNC, but I'd prefer the solution to work for my dev PC as well.
One google result said that vsync being enabled/disabled depends on the renderloop in use. I don't override the renderloop, so, since I'm on linux, I think I'm using the threaded renderloop.
Here's a bugreport about nvidia binary drivers causing this.
https://bugreports.qt.io/browse/QTBUG-45480
I too am using those drivers, so this may be it - just a driver bug. If so, at least it's unlikely to happen on my target hardware (I still haven't tested there), so that's good.
We've created a Windows 10 application that runs on tablets in Windows 10 kiosk mode. It works just fine, however, the wifi connection gets lost sometimes since the locations are very remote. We tried fixing the issue from the networking side, but when the devices lose and regain internet access the application will still hang as if it doesn't have internet access displaying a blank page. Where these devices are used, they are bolted into the wall to prevent theft. Which means if we want to reboot its very time consuming as we have to unscrew the cases off the wall and then open the cases to gain access to the power button, and the only way to get the application to run successfully again is to do a reboot on the device.
It was suggested that we have a way to perform a reboot from the application, however, every code example I've tried doesn't work in Windows 10 UWP. Here is the most common one I've found:
System.Diagnostics.Process.Start("restart", "/r");
I have access to the namespace
System.Diagnostics
but the Process class does not exist. Anyone have suggestions on rebooting via code on Win 10 UWP? Or a better solution to our issue? Thanks in advance.
It's also worth mentioning I tried execute a Powershell command too and the dll I need to reference for the Powershell class is not compatible with UWP.
What you require is not possible with the APIs available to UWP apps. This was a security decision. An app distributed through the store shouldn't be able to do things like restart machines.
Based on your scenario though you shouldn't need to go through the store. This means that you could PInvoke native code to do whatever you want. This would still need to be initiated on the actual device.
Yes you can do that!
You should add IoT System Administration in App capability declarations:
<Capabilities><iot:Capability Name="systemManagement"/></Capabilities>
and also You need to have "Windows IoT Extension for UWP" added to your project
using this for Shutdown
Windows.System.ShutdownManager.BeginShutdown(Windows.System.ShutdownKind.Shutdown, TimeSpan.FromSeconds(1)); //Delay is not relevant to shutdown
or for Restart
Windows.System.ShutdownManager.BeginShutdown(Windows.System.ShutdownKind.Restart, TimeSpan.FromSeconds(1)); //Delay before restart after shutdown
You can get more information in this Link
I'll start with a little background. A small project of mine has been to try to use my Android tablet as an external monitor for my laptop using a VNC client (vnc4server). There are two main options for doing this that I have seen. The simplest is to use xrandr and widen the screen, creating a section just for the tablet. However, this can cause some graphics issues if I understand correctly, although it has the benefit of permitting windows to cross displays. The other option is to run a separate desktop session for the VNC server.
I have chosen to go the route of a second desktop as the session can live and die without significantly affecting my main session and can in theory be tailored specifically to the tablet. A little tool called x2vnc allows me to connect to the VNC server in a similar manner to the more popular Synergy and use it like a n external monitor. I also have the nice little benefit of being able to easily and cleanly switch from landscape to portrait using xrandr.
This brings me to my current issue. So far, I have only been able to reliably use plain x-windows. Although this is entirely functional, I would prefer something more complete. Although xstartup examples have been posted for a variety of window managers, none of these seem to run properly. I suspect all of these are for headless systems. Gnome/Unity are each unforgivably slow and seem to conflict with my existing session. I also feel that these are a little too cluttered for my ten inch tablet. On the other hand, Xmonad simply crashes as soon as I try to open a second window in addition to not updating the graphics properly.
I would like to know anything that will lead me in the direction of a better stable desktop environment. This includes configuration tips and alternate window managers.
I am currently running Ubuntu 12.04 with gnome-xmonad (recently Unity). My xstartup is plain x-window-manager. I have tried any readily available examples for gnome and xmonad that I have been able to find.
I'm looking for a really really small linux distribution or process of making my own that's sole purpose is to get an air application to launch full screen and stay there; Essentially I'm building a home kitchen computer that runs entirely as an AIR app.
I have looked into using windows xp; and windows xp embedded but they pose so many issues I figured I'd try modern linux.
I have also seen TinyCore Linux which looks interestingly small but not sure what issues that poses in regards to running AIR and "hardware" accelerated display. I've also thought about stripping down an Ubuntu installation but I'm sure somebody must have done this already; google is just failing me right now...
I'm also interested in running an "embedded" version of say android and running the air app on some arm-based hardware again; with just the AIR runtimes only - although this is less preferred as it's more complex.
I'm also hooking this up to a touch screen monitor (not yet arrived) so I'll need to hunt down or write some drivers for translating the touch events into something AIR can understand... (this was my main intention for using windows in that all the drivers will just work).
What I'm after
Minified Linux kernel with JUST the drivers for the box I need
X Display with accelerated graphics support (Doesn't have to be X if AIR can run on a frame buffer?)
Running a Full screen AIR application (simple enough)
Ability to write back to the filesystem (enough support for AIR)
SSH Access for remote control
Samba for updating the filesystem (easier to maintain the system)
Touch screen support (3M Ex III I think...)
Audio support
Don't need
Don't need any window manager or any other GUI tools unless required by AIR
Don't need any toolbars or file managers or anything; The AIR app is the "OS"
Don't need any package managers or repos
Don't need multi user or logging in; everything can just run as an unprivileged account
Don't need to
I don't mind hand crafting the filesystem and configs if that makes it easier; I'm mainly looking for a "filesystem" that is as tiny as possible that I can just plop my AIR app into and write some scripts to get it to start when the X server starts
Thanks,
Chris
Try an embedded Linux build system such as Buildroot. It can build an entire system from source, and be very lightweight. The basic system is less than 1 MB in size.
Ended up going with Tiny Core. Very tiny and quick to boot up. You can also write extensions for it and you don't have a persistent drive which allows you to just switch the thing off without worry that it's going to break something -- exactly what you need in a kitchen :-D.
My current plan is to:
Just set up a working version using Ubuntu as this is mostly supported by Adobe
Slowly strip it back and try and get as little things to start as possible on boot
Try building my own distro/package from source and selecting only the packages I need
Compile my own kernel with nearly everything turned off and just leave on the things I need
I'm working on a Direct3D application and I sometimes need to terminate the application forcefully via the debugger. After the application has been terminated in this way a couple of times, Direct3D reports an "Out of video memory" error when attempting to create a new device. Presently I am working around this by switching my display resolution to 800x600 and back to previous resolution in the hope of "resetting" video memory. It works 99% of the time. But it would be nice to have a simple utility -- a command line app, perhaps -- to quickly reset my graphics card and Direct3D stack by releasing video memory explicitly.
How can I free video memory and other resources left behind by a forcefully terminated Direct3D application?
This is a driver bug. The driver should release the memory when the process exits. If it isn't doing so then you need to update your driver. If that still doesn't work you need to send a repro case to the IHV that made your card.