I have a .NET 3.5 WPF application on Windows 7 64bit. I am experiencing odd system freeze issue that happens when dragging and moving the main application window. Basically the entire system freezes (UI) and the application stops rendering.
Bringing up the task manager (CTRL+ALT+DEL) unfreezes both system and the application.
The application itself is a trading application that processes a large amount of messages in background threads.
Has anyone experienced this type of issues ? Especially the oddity of task manager unlocking the freeze. What could be the reason for this strange behavior?
I am almost certain it has something to do with dispatching certain actions to the UI thread.
Found some old post on StackOverflow that may help, It is said it may be due to font cache.
"I had the same problem. It was a corrupt font cache!!
See http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/7cc032c1-5f4d-4518-adc6-f53afd051e6b for a solution.
"
WPF Application Hang
Here are the steps that were asked to take.
In Win 7
1. Run services.msc
2. Stop Windows Presentation Foundation Font Cache 3.0.0.0 service
3. Delete FontCache3.0.0.0.dat
in XP:
%systemdrive%\Documents and Settings\LocalService\Local Settings\Application Data
in Vista: %windir%\ServiceProfiles\LocalService\AppData\Local
4. Restart the machine
What I do know is you can do the following.
The Windows operating system has a font cache file that is located here: C:\Windows\System32\FNTCACHE.DAT
Delete this file, and restart your system.
The issue was WCF service deadlocking. Issue similar to this
In the service that processed messages incoming messages had to be added on the UI thread to the collection the following way.
Action action = new Action(() =>
{
lock (_messagesLock)
{
_messages.Remove(message);
}
});
_dispatcher.Invoke(DispatcherPriority.Normal, action);
Changing
_dispatcher.Invoke(DispatcherPriority.Normal, action);
To
_dispatcher.BeginInvoke(DispatcherPriority.Normal, action);
Solved the issue.
Since WPF uses DirectX you should also make sure that DirectX and your video drivers are up to date and working correctly. A faulty video card or video driver could cause problems for WPF that might not manifest in other Win32 apps.
If you are using VS2010 and running the WPF app in Win 7 64 bit the answer to your issue may be this one:
Improving Performance by Changing the Visual Experience
You might have a problem with Hardware Acceleration in VS2010. I had an issue with rendering applications built using WPF because of this.
Give it a try: http://blogs.msdn.com/b/zainnab/archive/2010/06/22/improving-performance-by-changing-the-visual-experience-vstipenv0017.aspx
And if that doesn't fix your issue, go to your video card settings (nvidia or amd) and do a "reset settings". Then try again.
Related
I'm trying to convert an Android app to Windows 10 UWP. On android its easy: when boot completed, app service is started. It connects to controller over internet, fetches system state and all data (temp sensors, pumps, valves, etc) and keeps everything in memory. Foreground app can get data as soon as service gets them and display values, charts realtime. After closing foreground app, service keeps working, I still have all system state and I can play alarm sound if needed.
Is it possible to do [almost] same functionality on Windows 10 uwp?
I cannot find a way to start service with windows. Service started with foreground app is stopped when foreground app is closed. SocketBackgroundTask keeps connection perfect, but system state is lost with service.
Should I save system state to file and analyze all data after each renew? Data flow varies from once in 10 minutes to ~10 per second.
Or should I forget Windows 10 as limited platform?
I am designing a similar piece of sensor control software, and I have found UWP/Win10 to be limiting. We ultimately resorted to using Assigned Access to keep the app permanently in the foreground.
Assigned Access
Assigned access assigns an app to an account. So when Mr. Bob logs in, the app starts full-screen, and it cannot be closed, and if it crashes, it is restarted.
Note that the only way to access other parts of the system is to hit ALT-CTRL-DEL and log in as a different user. That might be bad for some, but if you have critical process monitoring going on, then it's probably a good thing that the user can't mess about with the system or quit the app.
It's also quite simple to implement, you only need to add a declaration to the app manifest, and you need Win10 Pro or Higher.
Windows IoT
You could also look at Windows 10 IoT, when you deploy an app to it, it does pretty much the same thing. However the range of hardware is quite limited, and many of them aren't fully functional yet - RPi suffers from SDcards being inherently unreliable, and lack of graphics acceleration. Dragonboard lacks driver support for resolutions other than 720p, etc. https://developer.qualcomm.com/forum/qdn-forums/hardware/iot-development-platform/29652
Extended Execution
In addition we have experimented with using extended execution, which lets the app run in minimised state, potentially indefinitely. I have mixed feelings about it. Although the app will keep running most of the time, but if the OS is struggling for resources, the app will get suspended and won't be restarted until the user switches back to it.
I'm currently running VS2013 Update 3, I'm building an app and i;m trying to mimic the Rate My App that shows up rate message dialog in b/w specified intervals.
My problem is that i've made a setting using ApplicationData.current.loclasettings and it is an integer.
and i want to see the settings number being updated every time i close and run the app to ensure the logic is perfect.
but i'm unable to do it. Every time i deploy the app from vs it replace the original app and thus erasing all the settings that have been previously saved.
I've tried to use attach a process but it doesnt work on windowsphones.
Well after a bit of research and going through the documentation it is clear that there is no way you can attach a process to the app that is already running on the phone.
At least for me there was no other way because Microsoft kept the USB debugging thing a little bit undocumented or not documented at all.
So, who ever are looking forward to first launch the app on a connected windows phone and then start the the connect to a process and select the appropriate device for communication , story it is not possible, at least the build that i;m using doesn't support. may there might be a better solution in the future.
I'm working on a metro app and am having trouble finding how not to show the application.
We recently deployed tablets to our field reps, and need to add gps tracking. GPS is much easier to deal with in the metro libs (it's like 4 lines of code vs. unmanaged) so we're hoping to be able to push a metro app instead of spending time coding a winforms/wpf desktop app (the tablets are full version windows, so it's an option if we can't hide a metro app. I feel like it should be possible though as the start screen tiles update automatically without opening the main program).
In WPF, it's fairly simple to make a window invisible. I'm creating the metro app in wpf, but it uses different libs than desktop and I may just not know how to do it.
In desktop programs, it's fairly simple. You do something along the lines of:
<Page
x:Class = xxxxxxxx
..
Visibility="Hidden">
Unfortunately, with metro, the only options I have are collapsed and visible. Collapsed doesn't seem to have any effect, unless it's just because it's not deployed and visual studio shows it anyway...
So basically I'm trying to figure out if there's a way to start the program minimized or hidden so that it doesn't interrupt the field reps every time it takes their location.
If you really want to make a metro app and want it to run "minimised" you will need to look at background task. To start the background task the user would still need to start the app at least once, futhermore background task have limitation how how often and how long they can run. Also there is a lot of constraint on deploying a windows store app if you cannot publish it in the store.
If your goal is to just have access to GPS through C# apis, the GPS is actually one of the winRT api you can use from the desktop, you can find a tutorial on how to access winRT api from the desktop here
Here is the complete list of winRT api accessible from the desktop (You can find Geoposition class among them).
Have you looked into creating a background task that transmits GPS? The background task can run without the app running.
I am not entirely certain you can voluntarily minimize a Windows Store App on a user's behalf. I see nothing in IntelliSense about it, nor have I found anything online or see any app do it.
However, be aware that deploying the app without using the Windows Store -- sideloading -- requires Windows 8 Enterprise edition computers joined to the domain OR Windows 8 Pro with a sideloading key ($30 per key, purchased in packs of at least 100.) Perhaps a WPF app with unmanaged code is worth the money and effort.
I am currently developing a stopwatch and timer app in C#/XAML for Windows Phone 8. While using my app on my phone, I found that it randomly closed out/crashed and that too at different points of use (i.e. I wasn't doing the same thing each time it closed out). While debugging, I found that my app closed out with the following error code in my output window:
"The program '[1100] TaskHost.exe' has exited with code -2147220717 (0x80040313)."
I am very confused as to why this is happening. I tried creating an entirely new solution and moving my code over and I've still been getting the same issue. I have tried using the app on multiple different devices, and the same thing happens (even in the Emulator). Sometimes the app crashes after 5 minutes of use, sometimes it crashes after 30 minutes of use, it's very unpredictable which makes it very hard to find the root of the problem. My app uses the XNA Framework to play an audio sound and the Coding4Fun Toolkit for a TimeSpanPicker control, and besides that there isn't much else that's particularly notable about my app. I have tried removing the playing of the audio file and removing references to the XNA Framework, and the problem persists.
Any ideas on what the problem could be?
Thanks in advance!
That what David said +
are you sure that the phone is not running out of memory?
Edit try a windows phone analysis(Alt +F1 | Debug->Start windows phone application analysis)
If you're using XNA framework in WP project you can get a crash when updating the UI thread.
You might need to run it through a Dispatcher?
Dispatcher.BeginInvoke(() => {
// Call your update UI methods here..
});
You might also find this post helpful:
http://social.msdn.microsoft.com/Forums/wpapps/en-US/c2751845-cb70-4301-aa1a-796fa1bb8e8c/the-program-241435222-taskhostexe-managed-has-exited-with-code-0-0x0
I'm developing an application that will be executed in a ThinClient with Windows Embedded 2009. It's written in C# 3.5. But, when I played for the first time with the ThinClient, I noticed that it has a lot of features disabled.
For example, there is no MyPc, or I can't have access to it.
So, my app needs to run when the client is turned on, but I can't find a service manager in embedded 2009.
Is there a way to make my app run every time the client is turned on?, I thought about a service, with automatic start. Can this be done like a windows service with no problems?
And another thing. My app also has to shut down the client. I've found a way to make it, but, I'd like to know if is different in Wndows Embedded.
Btw, the device has no hard disk.
Any other suggestion, will be very appreciated.
Have a nice day.
In the older Embedded there is a "startup"-folder (located on the flash-card containing the win-image)