Question

在我的项目中，我需要一个应用程序锁（与windows lock相同）。如果应用程序空闲一段时间，应该锁定应用程序，即应用程序的登录窗口将出现。如何在WPF C＃应用程序中执行此操作？

Answer 1

您可以使用这些功能

查看此代码，您必须在表单中添加一个计时器，并设置this.timer1.Enabled = true;

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace WindowsFormsApplication9
{
  internal struct LASTINPUTINFO
  {
    public uint cbSize;    
    public uint dwTime;
  }

  public partial class Form1 : Form
  {

    [DllImport("User32.dll")]
    public static extern bool LockWorkStation();
    [DllImport("User32.dll")]
    private static extern bool GetLastInputInfo(ref LASTINPUTINFO Dummy);
    [DllImport("Kernel32.dll")]
    private static extern uint GetLastError();

public static uint GetIdleTime()
{
  LASTINPUTINFO LastUserAction = new LASTINPUTINFO();
  LastUserAction.cbSize = (uint)System.Runtime.InteropServices.Marshal.SizeOf(LastUserAction);
  GetLastInputInfo(ref LastUserAction);
  return ((uint)Environment.TickCount - LastUserAction.dwTime);
}

public static long GetTickCount()
{
  return Environment.TickCount;
}

public static long GetLastInputTime()
{
  LASTINPUTINFO LastUserAction = new LASTINPUTINFO();
  LastUserAction.cbSize = (uint)System.Runtime.InteropServices.Marshal.SizeOf(LastUserAction);
  if (!GetLastInputInfo(ref LastUserAction))
  {
    throw new Exception(GetLastError().ToString());
  }

  return LastUserAction.dwTime;
}

    public Form1()
    {
      InitializeComponent();
    }

    private void timer1_Tick(object sender, EventArgs e)
    {
      if (GetIdleTime() > 10000)  //10 secs, Time to wait before locking
        LockWorkStation();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
      timer1.Start();
    }
  }
}

Answer 2

IMO接受的答案不如这种方法好：

http://www.codeproject.com/Articles/30345/Application-Idle

CodeProject文章使用Windows消息导致组件认为应用程序不空闲，例如

public enum ActivityMessages : int
{
    /// <summary>
    /// Cursor moved while within the nonclient area.
    /// </summary>
    WM_NCMOUSEMOVE = 0x00A0,
    /// <summary>
    /// Mouse left button pressed while the cursor was within the nonclient area.
    /// </summary>
    WM_NCLBUTTONDOWN = 0x00A1,
    /// <summary>
    /// Mouse left button released while the cursor was within the nonclient area.
    /// </summary>
    WM_NCLBUTTONUP = 0x00A2,
    /// <summary>

Answer 3

设置加载超时，每次“活动”动作发生时（您需要连接它们），将计时器重置为开始。

检查应用程序是否在一段时间内处于空闲状态并将其锁定

3 个答案: