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1. Marine aquarium screensaver hdmi problem serial#
2. Marine aquarium screensaver hdmi problem windows 10#

Public Shared Function GetForegroundWindow() As IntPtr Private Shared Function EnumDesktopWindows( Private Shared Function CloseDesktop(hDesktop As IntPtr) As Boolean Private Delegate Function EnumWindowsProc(hDesktop As IntPtr, lParam As IntPtr) As BooleanĭwDesiredAccess As DesktopAccessRights) As IntPtr Private Const SPI_GETSCREENSAVERRUNNING As UInteger = &H72 PostMessage(hWnd, WM_CLOSE, IntPtr.Zero, IntPtr.Zero) Private Shared Sub CloseWindow(hWnd As IntPtr) If IsWindowVisible(hWnd) Then CloseWindow(hWnd) Private Shared Sub TerminateScreenSaverCore()Ĭall New SecurityPermission(SecurityPermissionFlag.UnmanagedCode).Demand()ĭim hDesktop As IntPtr = OpenDesktop("Screen-saver", 0, False,ĭesktopAccessRights.DESKTOP_READOBJECTS Or DesktopAccessRights.DESKTOP_WRITEOBJECTS) SystemParametersInfo(SPI_GETSCREENSAVERRUNNING, 0UI, scState, 0UI) Public Shared Function GetScreenSaverActiveState() As Boolean NativeMethods class and helper methods: Imports If NativeMethods.GetScreenSaverActiveState() Then

Remove it if your code runs on a different Thread. Me.Activate() is not strictly required and can be used from the UI Tread only. ► Assuming this procedure is run in the UI Thread. If you have set Prefer 32-bit in your Project's Build option, you need to NOTE: your app is meant to run as a 64bit process.

Marine aquarium screensaver hdmi problem windows 10#

It's been tested in both Windows 10 (19H2) and Windows 7 SP1.

Marine aquarium screensaver hdmi problem serial#

If you have a procedure that receives a Command through a serial port or something similar, verify whether this procedure is run in a Thread other than the UI Thread, in case you need to access the UI in this occasion.Īdd this code to the procedure: it checks whether a ScreenSaver is active and tries to close it. Some more possibly interesting info related to ScreenSaver here: In case it fails, we can try to close the Desktop, calling CloseDesktop(). ( The ScreenSaver Window should the be Foreground Window anyway). Here, I'm using EnumDesktopWindows to find the ScreenSaver. You can use the SystemParametersInfo function, passing SPI_GETSCREENSAVERRUNNING to determine whether a ScreenSaver is currently active, then call OpenDesktop() get the handle of the Desktop (using its name), find the ScreenSaver Window (the ScreenSaver is a standard executable) and post a WM_CLOSE message to close it. You need to get the handle to this Desktop to actively interact with it or its Windows. You're probably not able to have a positive result using SendInput() or other functions because a ScreenSaver runs in special Desktop, named (guess what) Screen-saver.