Is there a way to know if the windows screen display is updated/changed programatically

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We have a requirement to check any customer is using the application or it is in idle state.

On the client system our application will run in full screen mode. Based on the user activity the display will be updated.But the problem is I dont have any access to the source code of the application. So I am thinking if I can get any display update events from windows when the screen is updated. If I get screen update event then I can consider that some customer is using the application

I am thinking of other approach is to get the screenshots in different intervals and compare. If both the images are matched then assuming it to be in idle mode or else some user activity is going on.

If I can get display update events then that will be easy for me to handle.Please let me know if you have any other approaches

What I have tried:

Searched online and microsoft website but could find information

Posted 12-Jul-20 7:54am

Coder969

Updated 12-Jul-20 17:18pm

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Richard MacCutchan 13-Jul-20 4:02am

What exactly are you trying to measure? And if it is your application why do you not have access to the source code? And finally, how are you going to capture information from a client's computer unless you have complete access to it?

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Garth J Lancaster · Answer 1 · 2020-07-12T17:18:00

I'd start poking at things like this FreeRDP · GitHub[^] and see how they do it .. Obviously transmitting full screens could be problematic, so being able to identify differential areas could be a technique.

There used to be a lot of information and code for VNC as well, might be worth trawling the net for

You might end up writing the guts in C++ for instance, since iirc, it was easier to access the Win32 Screen/Desktop APIs, rather than using Interop/P-Invoke from C#