How to track WinRT applications (in Win32 it was simple)?

Question

In "old" times I created simple tool for Windows users, which tracks what they were doing in the front of computer (where simple activity monitor). I was using Win32 api and functions like GetForegroundWindow, GetWindowThreadProcessId, etc.

Yesterday I installed new Windows 8 and tired to run my program. I got 50% success: for "classic" desktop it works like always:). For Metro UI I just got one application: WWAHost :( without any details.

So my question is: is there a any way for tracking active application in Metro UI? Thanks for help

UPDATE: I'm trying to access Metro UI app from Win32, I know that accessing Metro app from another Metro app is impossible

Answer 1

You see, in WinRT, your application is the top-most application. And when your app is not the top-most application then your threads are suspended and the kernel will not schedule any more operations for your app. End of story.

This means what you are wanting to accomplish cannot be done in WinRT. You are thinking more like a resident app or a service with access to the desktop. Those apps have two advantages. 1) they are always running. And, 2) they have the API to do what you are wanting.

WinRT intentionally puts apps in a sandbox so that the user's experience, performance and battery life are protected. Your scenario and scores more like yours underscore the continuing need for desktop apps. (as long as there is a continuing need for those types of apps ;)).

Sorry, if this is bad news.

As for enumerating other apps. This is also not possible. You cannot know if another app is installed or if it is running. You can call out to another app through protocol activation or file activation or (in a sense) through the share contract. But you are unaware if they get the message and if the user has it installed in the first place. And this is by design.

It is worth mentioning that you can pinvoke to Win32 APIs in your WinRT application. It causes lots of problems and can create a headache to get certified into the store. But even then, not all APIs are open to you. And you will find this particular use case is a non-starter.