Scenario. I want to make UWP(8.1/10) library (somekind of remote diagnostic of app) which works with my server. Is it possible to keep tcp/ip connection in background as long as possible?
I know about two things:
Run while minimized
Run background tasks indefinitely
But if I want to insert my library into some app and then upload it in Store, it won't work, am I right?
However, developers writing UWP apps for personal use (that is, side
loaded apps that won't be published in the Microsoft Store), or
developers writing Enterprise UWP apps, may want to use all resources
available on the device without any background or extended execution
throttling. Line of business and personal UWP applications can use
APIs in the Windows Creators Update (version 1703) to turn off
throttling. Be aware that you can't put an app into the Microsoft
Store if it uses these APIs.
Also I have read about ExtendedExecutionSession when app minimized from these questions:
Run Background Task Indefinitely in UWP
extendedExecutionSession : Can we run UWP like Desktop app without
Suspending?
But I'm still confused. So, can I make library for UWP(8.1/10) with long-running background tcp/ip connection and insert into app which will be uploaded in Windows Store?
i have a project this year wherein i need to connect windows phone to pc through a wifi connection and perform basic synchronization operation. . .
being new to this application development i have no idea where to start
the problem i am facing is
which protocol and service should i use .
i just want to know a basic code to establish connectivity between emulator and computer and transfer a simple message or something else...
i searched many sites but couldn't find a simple connectivity code.
i am using Microsoft Visual Studio 2010 Express for windows phone
But there are several ways to pull data from within an application to the phone:
Webservices, you create a web service and your application calls the webservice (sample)
Socket based (for example UDP)
If you want to do something without your app running (not being visible to the user) then you might have a look at background tasks. A sample is here. Though you're limited in what can be done in a background task, refer to Microsoft's documentation.
On other windows operating systems, I could create a Windows Service that listens to TCP/IP for any communication (like a PBX for example) through sockets.
But, how would i handle this in Windows 8? Applications can't run there all the time and when Windows 8 Metro starts up, applications for the normal desktop aren't running.
I need this service to start up all the time in any situation as soon as the computer starts up...
I also need http://pcapdotnet.codeplex.com an open source project to analyze the network...
What's the best future proof practice in an enterprise environment?
I don't have any Windows 8 experience on me yet.
Try this: If you make your windows service depend on something like the computer browser or could be the workstation service. The net connection should be up then.
You have to code this dependency in (no sample on hand).
In a situation where you have the UI frontend built using the new Metro style of apps for windows 8, and would like it to communicate with a .NET application running on the desktop on the same local machine (e.g. a windows service app).
What forms of interprocess communication are available between the metro app and the desktop app?
Thanks to Pavel Minaev of the Visual Studio team, who has provided some initial info here in a comment, quoted:
According to Martyn Lovell, there isn't any deliberate mechanism for
that, and some that could be used for it are intentionally restricted.
Named pipes aren't there, for example, nor are memory mapped files.
There are sockets (including server sockets), but when connecting to
localhost, you can only connect to the same app. You could use normal
files in one of the shared "known folders" (Documents, Pictures etc),
but that is a fairly crude hack that necessitates polling and is
visible to the user. -- Pavel Minaev commenting on this issue
So failing normal approaches I was thinking of using web services or reading/writing to a database in order to get some form of communication happening, both of which seem like overkill when the processes are running on the same machine.
Is what I'm attempting here making sense? I can see a need for a metro app to be the frontend UI for an existing service which is running on the desktop. Or is it better to just use WPF for the frontend UI running on the desktop (i.e. a non-metro app).
I'm porting my existing project to Win8 right now. It consists of windows service and tray application which are talking to each other via NamedPipes WCF. As you may already know Metro doesn't support named pipes. I ended up using TcpBinding for full duplex connection.
This post describes what functionality is supported.
Sample of my WCF server that Metro client can consume is here.
Also keep in mind that you can't use synchronous WCF in Metro. You'll have to use Task-based wrapper which is only asynchronous.
And thank you for you question. I was good starting point for me :)
There were a number of questions like this at the end of a //build/ session I attended. Aleš Holeček, the exec who did one of the big picture sessions, came up out of the audience to handle them. Even if you're not a C++ developer, download that session and watch the Q & A. http://channel9.msdn.com/Events/BUILD/BUILD2011/TOOL-789C
Metro apps can't count on desktop apps or services being installed on the machine. And desktop apps can't count on Metro apps running since they can be suspended any time. You need to start thinking differently. Listen to Aleš on this one.
Take note that with Windows 8.1 Update, communication between Windows Store apps and desktop components written in C# for .NET 4.5+ is now officially supported for side-loaded applications in Enterprise scenarios:
Brokered Windows Runtime Components for side-loaded Windows Store apps
To quote:
Recognizing that critical business functions and rules are embodied in existing software assets and that enterprises have a wide variety of scenarios for which the new application style will be highly productive, the Windows 8.1 Update includes a new feature called Brokered Windows Runtime Components for side-loaded applications. We use the term IPC (inter-process communication) to describe the ability to run existing desktop software assets in one process (desktop component) while interacting with this code in a Windows Store app. This is a familiar model to enterprise developers as data base applications and applications utilizing NT Services in Windows share a similar multi-process architecture.
Although implementing this approach is a bit on the complicated side initially, it allows for deep integration across Windows Store and desktop components. Just keep in mind that for the time being, it won't pass public Windows Store certification.
There is an article on InfoQ about how to build loosely coupled Metro apps with protocol handlers. This is something which has been supported by Windows for a long time and one could foresee an desktop application register itself as a protocol handler and maybe the metro application can communicate through this mechanism.
I have no idea if this is possible, but it might be interesting to check out.
Christophe Nasarre has blogged about a rather hacky way to do it using local files. The result is communication between desktop app/windows store app (referred to as DA/WSA in the blog), without having to switch between the UI of the two apps. He also blogged about another less hacky technique involving protocol handlers.
Note that having a WSA which communicates with a DA is explicitly forbidden by the store App certification requirements
Windows Store apps must not communicate with local desktop applications or services via local mechanisms, including via files and registry keys.
... but it restricts "local mechanisms" only. So I guess one can build a web service for routing the communications.
If you think that you can make an additional manual cmd operation,
you can try :
X:/> CheckNetIsolation.exe LoopbackExempt –a –n=<packageID>;
CheckNetIsolation.exe is included in winRT install, so there is nothing extra to be installed.
I tried it: it works, even after package updating.
As shown on: http://msdn.microsoft.com/en-us/library/windows/apps/Hh780593.aspx
Here it is explained how to find out the packageID for your app: http://social.msdn.microsoft.com/Forums/windowsdesktop/en-US/82bad7d4-d52b-4731-a396-13ab9004c1cc/how-to-get-the-appid-of-a-metro-style-app-
It is possible to communicate on the same machine from Metro app to desktop app using local service.
I've implemented some time ago simple "proof of concept", how to bypass the WinRT sandbox using local service. It still needs some kind of "social engineering" or direct guide for installing the service, but anyway, it is possible.
I'm not sure though about the certification rules about "local service" communication when adding such app to Windows Store.
Sample here
By design Metro application cannot access underlying PC directly, only using WinRT API and available capabilities. But when you create back-end service for accessing the PC and all data there, it's basically no longer running in sandbox.
The only "problem" is that user must manually install this back-end service, but that won't be a problem using some "social engineering":
User downloads "PC browser" Metro app, user can browse all pictures, music and videos, using WinRT API, but the app also shows message at the bottom:
"Download our PC browser powerpack and browse your entire PC, for FREE"
User is redirected to web page, from where user can download classic desktop installer containing "PC browser" back-end service for accessing files on users entire PC. Once this desktop service is installed, the Metro app can detect it and use it for browsing the entire PC. User is happy, but the WinRT sandbox is compromised.
Of course this won't work on Windows 8 ARM tablets. Using this workaround it could be even possible to build Metro app clients for classic desktop apps like antiviruses, torrent/P2P clients, etc.
Maybe I missed the point but when activating the Private networks capability I can connect to a local running (http) server using the local IP address (not localhost). This enables my scenario where a winrt app communicates with a wpf desktop app
I have to make an application that make pc-phone and pc - pc call with asp.net. However examples I see on the web are generally made as windows application.
Can anyone give me refference, examples, documents about voip and asp.net?
You can't make a VoIP call with a pure ASP.NET application. The problem is HTTP is a stateless protocol that drops connections as soon as data transfer has occurred. VoIP is a real time application where you need to have a constant connection between the various parties (client-pbx-destination, usually).
As a result, you would need to extend your ASP.NET application with either a ClickOnce .NET Windows Forms Application or other component that runs a local application on the user's machine.