问以编程方式禁用ScreenSaver

EN

Protected Sub SomeProcedure()
    If NativeMethods.GetScreenSaverActiveState() Then
        NativeMethods.TerminateScreenSaver()
        Me.Activate()
    End If
End Sub

Imports System.Runtime.InteropServices
Imports System.Security.Permissions

Friend Class NativeMethods
    Public Shared Sub TerminateScreenSaver()
        Try
            TerminateScreenSaverCore()
        Catch wex As Win32Exception
            MessageBox.Show(wex.Message)
        End Try
    End Sub

    Public Shared Function GetScreenSaverActiveState() As Boolean
        Dim scState As IntPtr = IntPtr.Zero
        SystemParametersInfo(SPI_GETSCREENSAVERRUNNING, 0UI, scState, 0UI)
        Return scState <> IntPtr.Zero
    End Function

    <UIPermission(SecurityAction.Demand, Action:=SecurityAction.Demand, Window:=UIPermissionWindow.AllWindows)>
    Private Shared Sub TerminateScreenSaverCore()
        Call New SecurityPermission(SecurityPermissionFlag.UnmanagedCode).Demand()

        Dim hDesktop As IntPtr = OpenDesktop("Screen-saver", 0, False,
            DesktopAccessRights.DESKTOP_READOBJECTS Or DesktopAccessRights.DESKTOP_WRITEOBJECTS)

        If hDesktop <> IntPtr.Zero Then
            If Not EnumDesktopWindows(hDesktop,
            Function(hWnd, lp)
                If IsWindowVisible(hWnd) Then CloseWindow(hWnd)
                Return True
            End Function, IntPtr.Zero) Then
                If Not CloseDesktop(hDesktop) Then
                    CloseWindow(GetForegroundWindow())
                End If
            End If
        End If
    End Sub

    Private Shared Sub CloseWindow(hWnd As IntPtr)
        PostMessage(hWnd, WM_CLOSE, IntPtr.Zero, IntPtr.Zero)
    End Sub

    Private Const WM_CLOSE As Integer = &H10
    Private Const SPI_GETSCREENSAVERRUNNING As UInteger = &H72

    Public Enum DesktopAccessRights As Long
        DESKTOP_CREATEMENU = &H4L
        DESKTOP_CREATEWINDOW = &H2L
        DESKTOP_ENUMERATE = &H40L
        DESKTOP_HOOKCONTROL = &H8L
        DESKTOP_JOURNALPLAYBACK = &H20L
        DESKTOP_JOURNALRECORD = &H10L
        DESKTOP_READOBJECTS = &H1L
        DESKTOP_SWITCHDESKTOP = &H100L
        DESKTOP_WRITEOBJECTS = &H80L
    End Enum

    Private Delegate Function EnumWindowsProc(hDesktop As IntPtr, lParam As IntPtr) As Boolean

    <DllImport("user32.dll", CharSet:=CharSet.Unicode, SetLastError:=True)>
    Private Shared Function OpenDesktop(
        lpszDesktop As String,
        dwFlags As UInteger,
        <[In], MarshalAs(UnmanagedType.Bool)> fInherit As Boolean,
        dwDesiredAccess As DesktopAccessRights) As IntPtr
    End Function

    <DllImport("user32.dll", CharSet:=CharSet.Unicode, SetLastError:=True)>
    Private Shared Function CloseDesktop(hDesktop As IntPtr) As Boolean
    End Function

    <DllImport("user32.dll", CharSet:=CharSet.Unicode, SetLastError:=True)>
    Private Shared Function EnumDesktopWindows(
        hDesktop As IntPtr,
        callback As EnumWindowsProc,
        lParam As IntPtr) As Boolean
    End Function

    <DllImport("user32.dll", CharSet:=CharSet.Unicode, SetLastError:=True)>
    Public Shared Function GetForegroundWindow() As IntPtr
    End Function

    <DllImport("user32.dll", CharSet:=CharSet.Unicode, SetLastError:=True)>
    Private Shared Function IsWindowVisible(hWnd As IntPtr) As <MarshalAs(UnmanagedType.Bool)> Boolean
    End Function

    <DllImport("user32.dll", CharSet:=CharSet.Unicode, SetLastError:=True)>
    Private Shared Function PostMessage(hWnd As IntPtr, msg As UInteger, wParam As IntPtr, lParam As IntPtr) As Boolean
    End Function

    <DllImport("user32.dll", CharSet:=CharSet.Auto, SetLastError:=True)>
    Private Shared Function SystemParametersInfo(uiAction As UInteger, uiParam As UInteger, ByRef pvParam As IntPtr, fWinIni As UInteger) As Boolean
    End Function
End Class

using System.Runtime.InteropServices;
using System.Security.Permissions;

internal static class NativeMethods
{
    public static void TerminateScreenSaver()
    {
        try {
            TerminateScreenSaverCore();
        }
        catch(Win32Exception wex){
            MessageBox.Show(wex.Message);
        }
    }

    public static bool GetScreenSaverActiveState()
    {
        var scState = IntPtr.Zero;
        SystemParametersInfo(SPI_GETSCREENSAVERRUNNING, 0U, ref scState, 0U);
        return scState != IntPtr.Zero;
    }

    [UIPermission(SecurityAction.Demand, Action = SecurityAction.Demand, Window = UIPermissionWindow.AllWindows)]
    private static void TerminateScreenSaverCore()
    {
        new SecurityPermission(SecurityPermissionFlag.UnmanagedCode).Demand();

        IntPtr hDesktop = OpenDesktop("Screen-saver", 0, false, 
            DesktopAccessRights.DESKTOP_READOBJECTS | DesktopAccessRights.DESKTOP_WRITEOBJECTS);
        if (hDesktop != IntPtr.Zero) {
            if (!EnumDesktopWindows(hDesktop, (hWnd, lp)=> {
                if (IsWindowVisible(hWnd)) CloseWindow(hWnd);
                return true;
            }, IntPtr.Zero) || !CloseDesktop(hDesktop)) {
                CloseWindow(GetForegroundWindow());
            }
        }
    }

    private static void CloseWindow(IntPtr hWnd)
    {
        PostMessage(hWnd, WM_CLOSE, IntPtr.Zero, IntPtr.Zero);
    }

    private const uint SPI_GETSCREENSAVERRUNNING = 0x0072;
    private const int WM_CLOSE = 0x0010;

    public enum DesktopAccessRights : long
    {
        DESKTOP_CREATEMENU = 0x0004L,        // Required to create a menu on the desktop.
        DESKTOP_CREATEWINDOW = 0x0002L,      // Required to create a window on the desktop.
        DESKTOP_ENUMERATE = 0x0040L,         // Required for the desktop to be enumerated.
        DESKTOP_HOOKCONTROL = 0x0008L,       // Required to establish any of the window hooks.
        DESKTOP_JOURNALPLAYBACK = 0x0020L,   // Required to perform journal playback on a desktop.
        DESKTOP_JOURNALRECORD = 0x0010L,     // Required to perform journal recording on a desktop.
        DESKTOP_READOBJECTS = 0x0001L,       // Required to read objects on the desktop.
        DESKTOP_SWITCHDESKTOP = 0x0100L,     // Required to activate the desktop using the SwitchDesktop function.
        DESKTOP_WRITEOBJECTS = 0x0080L       // Required to write objects on the desktop.
    }

    private delegate bool EnumWindowsProc(IntPtr hDesktop, IntPtr lParam);

    [DllImport("user32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
    private static extern IntPtr OpenDesktop(
        string lpszDesktop, 
        uint dwFlags, 
        [In, MarshalAs(UnmanagedType.Bool)]bool fInherit, 
        DesktopAccessRights dwDesiredAccess);

    [DllImport("user32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
    private static extern bool CloseDesktop(IntPtr hDesktop);

    [DllImport("user32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
    private static extern bool EnumDesktopWindows(IntPtr hDesktop, EnumWindowsProc callback, IntPtr lParam);

    [DllImport("user32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
    private static extern bool IsWindowVisible(IntPtr hWnd);

    [DllImport("user32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
    public static extern IntPtr GetForegroundWindow();

    [DllImport("user32.dll", CharSet = CharSet.Unicode, SetLastError = true)]

    [DllImport("user32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
    private static extern bool PostMessage(IntPtr hWnd, uint msg, IntPtr wParam, IntPtr lParam);

    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    private static extern bool SystemParametersInfo(uint uiAction, uint uiParam, ref IntPtr pvParam, uint fWinIni);
}