我正在寻找在屏幕保护程序变为活动或不活动时发生的事件。我想收到通知。我不想使用任何计时器。
我不想对它进行民意调查。我不想使用：SystemParametersInfo（SPI_GETSCREENSAVERRUNNING，0，ref isRunning，0）;
我试过没有成功，我从未收到过SC_SCREENSAVE ......
// ************************************************************************
public MainWindow()
{
InitializeComponent();
}
// ************************************************************************
protected override void OnSourceInitialized(EventArgs e)
{
base.OnSourceInitialized(e);
IntPtr mainWindowPtr = new WindowInteropHelper(this).Handle;
HwndSource mainWindowSrc = HwndSource.FromHwnd(mainWindowPtr);
if (mainWindowSrc != null)
{
mainWindowSrc.AddHook(WndProc);
}
//HwndSource source = PresentationSource.FromVisual(this) as HwndSource;
//source.AddHook(WndProc);
}
// ************************************************************************
private const Int32 WM_SYSCOMMAND = 0x112;
private const int SC_SCREENSAVE = 0xF140;
private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
if (msg == WM_SYSCOMMAND)
{
Debug.Print("SysCommand : " + wParam);
if (wParam.ToInt32() == SC_SCREENSAVE)
{
Debug.Print(DateTime.Now.ToString());
}
}
return IntPtr.Zero;
}
任何人都有任何其他想法或者确实知道我的代码有什么问题???
答案 0 :(得分：3)
if (wParam.ToInt32() == SC_SCREENSAVE)
这不正确。这是WM_SYSCOMMAND message中的一个奇怪的怪癖，肯定可以追溯到一个早已不复存在的时代，他们不得不挤压640千字节的GUI操作系统。命令值中的低4位用于内部目的。在比较之前，你必须将它们掩盖掉。修正：
if ((wParam.ToInt32() & 0xfff0) == SC_SCREENSAVE)
您可能已经通过使用正确的Debug语句格式化自己想出了这一点：）
Debug.Print("SysCommand : 0x{0:X}", wParam);
答案 1 :(得分：0)
汉斯的答案在Windows 7上通常被定时器激活时似乎不适用于我（至少当你的帐户是域的一部分并且策略使屏幕保护程序参数为readonly时）。
使用SystemParametersInfo与SPI_GETSCREENSAVERRUNNING工作正常，但它需要一个计时器（轮询），这是我的观点：可怕的设计糟糕的代码...但到目前为止，这是我发现的唯一方法。 .. :-(
我留下了我的代码作为参考。它包括我的许多测试。 还有更多，但只是删除你不需要的东西。 你可以在那里咨询HotKey优秀课程（我找不到我的初始资料，但这个完全相同）：https://github.com/shellscape/Lumen/blob/master/Application/HotkeyHandler.cs
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Interop;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Windows.Threading;
using HQ.Util.General;
using HQ.Util.Unmanaged;
using HQ.Wpf.Util;
using Microsoft.Win32;
using SpreadsheetGear;
namespace MonitorMe
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public enum HookType : int
{
WH_JOURNALRECORD = 0,
WH_JOURNALPLAYBACK = 1,
WH_KEYBOARD = 2,
WH_GETMESSAGE = 3,
WH_CALLWNDPROC = 4,
WH_CBT = 5,
WH_SYSMSGFILTER = 6,
WH_MOUSE = 7,
WH_HARDWARE = 8,
WH_DEBUG = 9,
WH_SHELL = 10,
WH_FOREGROUNDIDLE = 11,
WH_CALLWNDPROCRET = 12,
WH_KEYBOARD_LL = 13,
WH_MOUSE_LL = 14
}
delegate IntPtr HookProc(int code, IntPtr wParam, IntPtr lParam);
private HotKeyHandeler _hotKeyHandler = null;
private Timer _timerToMonitorScreenSaver = null;
// ************************************************************************
public MainWindow()
{
InitializeComponent();
SystemEvents.SessionSwitch += SystemEvents_SessionSwitch;
Monitor.Instance.Add(SessionSwitchReason.SessionLogon);
_timerToMonitorScreenSaver = new Timer(TimerCallbackMonitorScreenSaver, this, 3000, 3000);
}
private void TimerCallbackMonitorScreenSaver(object state)
{
int active = 1;
SystemParametersInfo(SPI_GETSCREENSAVERRUNNING, 0, ref active, 0);
if (active == 1)
{
Debug.Print("Timer detected Screen Saver activated on: " + DateTime.Now.ToString());
}
}
[DllImport("user32.dll", SetLastError = true)]
static extern IntPtr SetWindowsHookEx(HookType hookType, HookProc lpfn, IntPtr hMod, uint dwThreadId);
[DllImport("user32.dll")]
static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode, IntPtr wParam, IntPtr lParam);
[DllImport("kernel32", SetLastError = true, CharSet = CharSet.Unicode)]
static extern IntPtr LoadLibrary(string lpFileName);
// Signatures for unmanaged calls
[DllImport("user32.dll", CharSet = CharSet.Auto)]
private static extern bool SystemParametersInfo(
int uAction, int uParam, ref int lpvParam,
int flags);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
private static extern bool SystemParametersInfo(
int uAction, int uParam, ref bool lpvParam,
int flags);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
private static extern int PostMessage(IntPtr hWnd,
int wMsg, int wParam, int lParam);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
private static extern IntPtr OpenDesktop(
string hDesktop, int Flags, bool Inherit,
uint DesiredAccess);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
private static extern bool CloseDesktop(
IntPtr hDesktop);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
private static extern bool EnumDesktopWindows(
IntPtr hDesktop, EnumDesktopWindowsProc callback,
IntPtr lParam);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
private static extern bool IsWindowVisible(
IntPtr hWnd);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern IntPtr GetForegroundWindow();
// Callbacks
private delegate bool EnumDesktopWindowsProc(
IntPtr hDesktop, IntPtr lParam);
// 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;
[DllImport("User32.dll")]
public static extern int SendMessage
(IntPtr hWnd,
uint Msg,
uint wParam,
uint lParam);
public enum SpecialHandles
{
HWND_DESKTOP = 0x0,
HWND_BROADCAST = 0xFFFF
}
// Registers a hot key with Windows.
[DllImport("user32.dll")]
private static extern bool RegisterHotKey(IntPtr hWnd, int id, uint fsModifiers, uint vk);
// Unregisters the hot key with Windows.
[DllImport("user32.dll")]
private static extern bool UnregisterHotKey(IntPtr hWnd, int id);
private IntPtr _hHook;
// ************************************************************************
void _hotKeyHandler_HotKeyPressed(object sender, HotKeyEventArgs e)
{
ActivateScreenSaver();
}
// ************************************************************************
private IntPtr MessageHookProc(int code, IntPtr wParam, IntPtr lParam)
{
if (code == WM_SYSCOMMAND)
{
Debug.Print("SysCommand : " + wParam);
if ((wParam.ToInt32() & 0xfff0) == SC_SCREENSAVE)
{
Debug.Print("MessageHookProc" + DateTime.Now.ToString());
}
}
return CallNextHookEx(_hHook, code, wParam, lParam);
}
// ************************************************************************
private const Int32 WM_SYSCOMMAND = 0x0112;
private const int SC_SCREENSAVE = 0xF140;
private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
if (msg == WM_SYSCOMMAND)
{
Debug.Print("SysCommand : " + wParam);
if ((wParam.ToInt32() & 0xfff0) == SC_SCREENSAVE)
{
// Works fine in almost all cases. I already did some code in the past which activate the screen saver
// but I never receive any WM_SYSCOMMAND for that code, I do not have source code for it anymore).
Debug.Print("WndProc" + DateTime.Now.ToString());
}
}
return IntPtr.Zero;
}
// ************************************************************************
void SystemEvents_SessionSwitch(object sender, SessionSwitchEventArgs e)
{
Monitor.Instance.Add(e.Reason);
}
// ************************************************************************
private void CmdExportToExcel_Click(object sender, RoutedEventArgs e)
{
ExportToExcel();
}
// ************************************************************************
private void ExportToExcel()
{
IWorkbook wb = Factory.GetWorkbook();
IWorksheet workSheet = wb.Worksheets[0];
int col = 1;
for (int dayIndex = -30; dayIndex <= 0; dayIndex++)
{
DateTime day = DateTime.Today + new TimeSpan(dayIndex, 0, 0, 0);
Debug.Print(day.ToString("yyyy-MM-dd"));
workSheet.Cells[0, col].Value = day.DayOfWeek.ToString();
workSheet.Cells[1, col].Value = day;
DayMonitor dayMonitor = Monitor.Instance.DayMonitors.FirstOrDefault(dm => dm.Day == day);
if (dayMonitor != null)
{
workSheet.Cells[2, col].Value = "Last - First";
workSheet.Cells[2, col + 1].Value = dayMonitor.TotalHours;
workSheet.Cells[3, col].Value = "Has estimated time (7h00 or 18h00)";
workSheet.Cells[3, col + 1].Value = dayMonitor.HasSomeEstimatedHours;
int row = 5;
foreach (var state in dayMonitor.SessionLockStateChanges)
{
workSheet.Cells[row, col].Value = state.SessionSwitchReason.ToString();
workSheet.Cells[row, col + 1].Value = state.DateTime;
row++;
}
}
workSheet.Cells[1, col].ColumnWidth = 18;
workSheet.Cells[1, col + 1].ColumnWidth = 18;
col += 2;
}
if (wb != null)
{
if (FileAssociation.IsFileAssociationExistsForExtensionWithDot(".xlsx"))
{
string path = TempFolderAutoClean.GetTempFileName("xlsx", "Export ");
wb.SaveAs(path, FileFormat.OpenXMLWorkbook);
Process p = new Process();
p.StartInfo.UseShellExecute = true;
p.StartInfo.FileName = path;
p.Start();
}
else
{
SaveFileDialog saveFileDialog = new SaveFileDialog();
saveFileDialog.InitialDirectory = Environment.CurrentDirectory;
saveFileDialog.Filter = "Excel file (*.xlsx)|*.xlsx";
saveFileDialog.DefaultExt = ".xlsx";
if (saveFileDialog.ShowDialog(Application.Current.MainWindow) == true)
{
string path = saveFileDialog.FileName;
wb.SaveAs(path, FileFormat.OpenXMLWorkbook);
}
}
}
}
// ************************************************************************
private void PrintOnExecuted(object sender, ExecutedRoutedEventArgs e)
{
ExportToExcel();
}
// ************************************************************************
private void ExitOnExecuted(object sender, ExecutedRoutedEventArgs e)
{
this.Close();
}
// ************************************************************************
private void PrintOnCanExecute(object sender, CanExecuteRoutedEventArgs e)
{
e.CanExecute = true;
e.ContinueRouting = false;
}
// ************************************************************************
private void ExitOnCanExecute(object sender, CanExecuteRoutedEventArgs e)
{
e.CanExecute = true;
e.ContinueRouting = false;
}
// ************************************************************************
private void CmdLaunchScreenSaver_Click(object sender, RoutedEventArgs e)
{
ActivateScreenSaver();
}
// ************************************************************************
private void ActivateScreenSaver()
{
// Next won't work in a secured Screen Saver by Account Policy (ex: by a domain policy)
//int nullVar = 0;
//SystemParametersInfo(SPI_SETSCREENSAVERACTIVE, 1, ref nullVar, SPIF_SENDWININICHANGE);
// This works fine all the time... and also send appropriate message to every top level window
SendMessage(new IntPtr((int)SpecialHandles.HWND_BROADCAST), WM_SYSCOMMAND, SC_SCREENSAVE, 0);
}
// ************************************************************************
private void MainWindow_OnInitialized(object sender, EventArgs e)
{
int error;
IntPtr hMod = LoadLibrary("user32.dll"); // Hans Passant info in stackOverflow
_hHook = SetWindowsHookEx(HookType.WH_GETMESSAGE, MessageHookProc, IntPtr.Zero, (uint)Thread.CurrentThread.ManagedThreadId);
error = Marshal.GetLastWin32Error(); // Error 87
_hHook = SetWindowsHookEx(HookType.WH_GETMESSAGE, MessageHookProc, hMod, (uint)Thread.CurrentThread.ManagedThreadId);
error = Marshal.GetLastWin32Error(); // Error 87
_hHook = SetWindowsHookEx(HookType.WH_GETMESSAGE, MessageHookProc, hMod, 0);
error = Marshal.GetLastWin32Error(); // Work fine, got a hook, but never receive the WM_SYSCOMMAND:SC_SCREENSAVE
}
// ************************************************************************
private void MainWindow_OnLoaded(object sender, RoutedEventArgs e)
{
}
// ************************************************************************
protected override void OnSourceInitialized(EventArgs e)
{
base.OnSourceInitialized(e);
// Method 1
//IntPtr mainWindowPtr = new WindowInteropHelper(this).Handle;
//HwndSource mainWindowSrc = HwndSource.FromHwnd(mainWindowPtr);
//if (mainWindowSrc != null)
//{
// mainWindowSrc.AddHook(WndProc);
//}
// Method 2
HwndSource source = PresentationSource.FromVisual(this) as HwndSource;
source.AddHook(WndProc);
_hotKeyHandler = new HotKeyHandeler(this);
_hotKeyHandler.HotKeyPressed += _hotKeyHandler_HotKeyPressed;
// _hotKeyHandler.RegisterHotKey(0, Key.NumPad0);
this.Visibility = Visibility.Hidden;
}
// ************************************************************************
}
}