How check if Screen recorder run in wpf?

Question

How check if Screen recorder run in wpf?

linky 21

Hi I have media element in my program and I do not want the user record the Content. So I need to Block every Screen recorder in Windows, Linux and Mac.

First: I wanted to use Process.GetProcess to Block all of that program and Create Black list, But there is so many of them and the name process of some of them different in each OS.

Second: I decided to Create White list and only let use Use program I want, otherwise my app is stop working until user close all program. But in this solution can not be filtered properly because C# can not get the Owner of process.

Now I think all of the Screen Recorder with All screen records, with any feature, probably have a fixed central structure and use a registry, especially in operating systems.

I wanted to know what this registry is and how to check it with c#? Also, if my solution is wrong, how can I recognize and close the screen records? Even if the user has programmed his own screen recorder?

Answer accepted by question author

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Answer 1

Castorix31 91,416

You can use SetWindowDisplayAffinity

I did a test on my OS (Windows 10 1909) and it worked

Declarations :

[DllImport("User32.dll", SetLastError = true)]  
private static extern bool SetWindowDisplayAffinity(IntPtr hWnd, uint dwAffinity);  

public const int WDA_NONE   = 0x00000000;  
public const int WDA_MONITOR = 0x00000001;  
public const int WDA_EXCLUDEFROMCAPTURE = 0x00000011;

Vardan Balyan 10 Reputation points

2023-05-26T12:42:33.9266667+00:00
Hi i have a WPF application based on .NET 6 and i want to disable the screen capture for my app and found this above code but this code is not working in my project. If i debug my code by getting the last error from Marshal.GetLastWin32Error() then it returns value 87 (ERROR_INVALID_PARAMETER).

Here is my code for reference :

[DllImport("User32.dll", SetLastError = true)] private static extern bool SetWindowDisplayAffinity(IntPtr hWnd, uint dwAffinity); public const int WDA_NONE = 0x00000000; public const int WDA_MONITOR = 0x00000001; public const int WDA_EXCLUDEFROMCAPTURE = 0x00000011; private void Window_Loaded(object sender, RoutedEventArgs e) { SetWindowDisplayAffinity(new WindowInteropHelper(this).Handle, WDA_MONITOR); var res = Marshal.GetLastWin32Error(); }

What am i doing wrong here? Or am i missing something important?

Thanks

Answer 2

linky 21

Thank you. I will try and tell you the result here.

Answer 3

linky 21

Your code worked on my OS. my OS is win 10 and the according to MSDN this code worked for win 7 and higher Version. but are this code worked on Linux and Mac to?

Answer 4

linky 21

sorry for another post in row.
I took a few more tests and found that despite the video not being recorded, the audio was still being recorded. What solution would you suggest for this too?
Or I want stop playing the media element after recorder open. But how can I do it?

simonberrurier-7045 41 Reputation points

2020-11-10T09:50:27.087+00:00

Blocking audio seems impossible, because there are a lot of methods to record audio (like wasapi)
linky 21 Reputation points

2020-11-10T12:43:21.833+00:00

OK if impossible blocking audio because of something like WASAPI. Then The user can still be stopped from recording. All I have to do is run a recorder every time I tell Media Element to stop playing. It can still be stopped user. we only need stop media element from working.
So how can add the condition to this code and stop my program working after user run recorder?

https://stackoverflow.com/questions/56712964/how-to-use-setwindowdisplayaffinity

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How check if Screen recorder run in wpf?

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