c# - How can I undo SetWindowDisplayAffinity method?

Question

I have a C# application that prevents screen capturing, but I want to disable "black screen".

Here is my code:

[DllImport("user32.dll")]
public static extern uint SetWindowDisplayAffinity(IntPtr hWnd, uint dwAffinity);

protected override void OnLoad(EventArgs e)
{
    base.OnLoad(e);
    SetWindowDisplayAffinity(this.Handle, WDA_MONITOR);
}

In which way I can disable it?

question from:https://stackoverflow.com/questions/65899149/how-can-i-undo-setwindowdisplayaffinity-method

Answer 1

Using SetWindowDisplayAffinity, to exclude a window from capture, pass WDA_EXCLUDEFROMCAPTURE or WDA_MONITOR as parameter and to undo (include in capture), pass WDA_NONE:

[DllImport("user32.dll")]
static extern uint SetWindowDisplayAffinity(IntPtr hWnd, uint dwAffinity);
const uint WDA_NONE = 0x00000000;
const uint WDA_MONITOR = 0x00000001;
const uint WDA_EXCLUDEFROMCAPTURE = 0x00000011;

private void includeButton_Click(object sender, EventArgs e)
{
    SetWindowDisplayAffinity(this.Handle, WDA_NONE);
}

private void excludeButton_Click(object sender, EventArgs e)
{
    SetWindowDisplayAffinity(this.Handle, WDA_MONITOR);
}

Window included in capture:

Window expluded from capture: