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如何在C#中调用Windows中的屏幕保护程序?

screensaver managed windows .net c#

Ron Klein Noa Kuperberg · 技术社区 · 16 年前

我知道它可以使用纯C++代码完成(然后在C中的包是非常简单的),如建议的那样。 here

尽管如此,出于好奇,我想知道这样的任务是否可以通过使用点网框架(2版和以上)的纯托管代码来完成,不需要P/INKEKE,也不需要访问C++端(这反过来又可以很容易地使用Windows API)。

5 回复 | 直到 6 年前

Matt Brindley 16 年前

我有一个想法,我不确定这会持续多久,所以我想你需要研究一下,但希望这足以让你开始。

屏幕保护程序只是一个可执行文件,注册表将此可执行文件的位置存储在 HKCU\Control Panel\Desktop\SCRNSAVE.EXE

在我的Vista副本上,这对我很有用:

RegistryKey screenSaverKey = Registry.CurrentUser.OpenSubKey(@"Control Panel\Desktop");
if (screenSaverKey != null)
{
    string screenSaverFilePath = screenSaverKey.GetValue("SCRNSAVE.EXE", string.Empty).ToString();
    if (!string.IsNullOrEmpty(screenSaverFilePath) && File.Exists(screenSaverFilePath))
    {
        Process screenSaverProcess = Process.Start(new ProcessStartInfo(screenSaverFilePath, "/s"));  // "/s" for full-screen mode
        screenSaverProcess.WaitForExit();  // Wait for the screensaver to be dismissed by the user
    }
}

Charlie Salts 16 年前

我认为拥有一个.Net库函数来实现这一点是不太可能的——我不知道有这样的函数。快速搜索返回此代码项目 tutorial

P/invoke的存在使您能够访问特定于操作系统的功能,例如屏幕保护程序。

Community CDub 8 年前

我不确定您是否可以使用完全托管的代码来实现这一点。

Launch System Screensaver from C# Windows Form

Eric Ouellet 9 年前

正在处理任何版本的windows。。。

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace HQ.Util.Unmanaged
{
    public class ScreenSaverHelper
    {
        [DllImport("User32.dll")]
        public static extern int SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);

        [DllImport("user32.dll", EntryPoint = "GetDesktopWindow")]
        private static extern IntPtr GetDesktopWindow();

        // Signatures for unmanaged calls
        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        private static extern bool SystemParametersInfo(int uAction, int uParam, ref int lpvParam, int flags);

        // Constants
        private const int SPI_GETSCREENSAVERACTIVE = 16;
        private const int SPI_SETSCREENSAVERACTIVE = 17;
        private const int SPI_GETSCREENSAVERTIMEOUT = 14;
        private const int SPI_SETSCREENSAVERTIMEOUT = 15;
        private const int SPI_GETSCREENSAVERRUNNING = 114;
        private const int SPIF_SENDWININICHANGE = 2;

        private const uint DESKTOP_WRITEOBJECTS = 0x0080;
        private const uint DESKTOP_READOBJECTS = 0x0001;
        private const int WM_CLOSE = 16;

        public const uint WM_SYSCOMMAND = 0x112;
        public const uint SC_SCREENSAVE = 0xF140;
        public enum SpecialHandles
        {
            HWND_DESKTOP = 0x0,
            HWND_BROADCAST = 0xFFFF
        }
        public static void TurnScreenSaver(bool turnOn = true)
        {
            // Does not work on Windows 7
            // int nullVar = 0;
            // SystemParametersInfo(SPI_SETSCREENSAVERACTIVE, 1, ref nullVar, SPIF_SENDWININICHANGE);

            // Does not work on Windows 7, can't broadcast. Also not needed.
            // SendMessage(new IntPtr((int) SpecialHandles.HWND_BROADCAST), WM_SYSCOMMAND, SC_SCREENSAVE, 0);

            SendMessage(GetDesktopWindow(), WM_SYSCOMMAND, (IntPtr)SC_SCREENSAVE, (IntPtr)0);
        }
    }
}