我的屏幕保护程序正在停止屏幕挂起,但我不希望它

本文关键字:希望 挂起 屏幕 程序 屏幕保护 我的 | 更新日期: 2023-09-27 18:36:16

我在.Net 4.0中做了一个屏幕保护程序。它基本上只是移动图像中的位并使用 .在计时器上失效并重写 onPaint 事件。

到目前为止,它工作得很好 - 但是 - 我注意到它的一个问题。

它会阻止监视器在挂起超时后挂起。自从我安装它以来,我的显示器现在保持 24/7 全天候运行。

问题是,我没有做任何事情来专门停止节能功能 - 并且我已经确保我的计算机的节能设置已设置(它们是)。因此,我选择了另一个屏幕保护程序,以确保设置仍然有效。监视器在超时后挂起。

那么我需要做什么才能很好地使用电源管理?我在谷歌上搜索了这个答案,我找到的所有内容都是如何阻止电源管理,我没有明确阻止它!我只是想在需要的时候允许暂停。

我的屏幕保护程序正在停止屏幕挂起,但我不希望它

您是否不小心捕获了WM_SYSCOMMAND的0xF170(SC_MONITORPOWER)子命令?

我能够让我的程序"玩得很好"。我不知道为什么这有效,而原始代码没有,但这不仅有效 - 它实际上使程序更加"省电"友好,因为它通过在屏幕挂起后不进行计算来减少 CPU 周期。简而言之,我预览 WndProc 消息并查找监视器正在暂停的消息,一旦收到它,我就会停止重绘,直到它恢复(可以恢复并使屏幕保护程序仍然处于活动状态)。

代码更改:

    // Field Definitions
    /// <summary>
    /// Constants that relate to the WndProc messages we wish to intercept and evaluate.
    /// </summary>
    [System.Diagnostics.CodeAnalysis.SuppressMessage("StyleCop.CSharp.NamingRules", "SA1310:FieldNamesMustNotContainUnderscore", Justification = "Standard practice to use this naming style for Win32 API Constants.")]
    private const int WM_SYSCOMMAND = 0x0112, SC_MONITORPOWER = 0xF170;
    /// <summary>
    /// Gets or sets whether we are suspended. Should coincide with whether the display is turned on or not.
    /// </summary>
    private bool isSuspended = false;

    // New overridden method
    /// <summary>
    /// Intercepts WndProc messages. We are looking for the screen suspend activity. From it, we will return that we are able to suspend and we ourselves will suspend.
    /// </summary>
    /// <param name="m">Message to be checked.</param>
    protected override void WndProc(ref Message m)
    {
        if (m.Msg == WM_SYSCOMMAND)
        {
            // The 0x000F bits are used to indicate the specific state and must be ignored to see if this is a monitor power event.
            if ((m.WParam.ToInt32() & 0xFFF0) == SC_MONITORPOWER)
            {
                switch (m.WParam.ToInt32() & 0x000F)
                {
                    case -1:
                        // Display powering on - resume operation
#if DEBUG
                        System.Diagnostics.Debug.WriteLine("Display powered on.");
#endif
                        this.isSuspended = false;
                        break;
                    case 0:
                    case 1:
                    case 2:
                        // Display being powered off - suspend operation
#if DEBUG
                        System.Diagnostics.Debug.WriteLine("Display suspended");
#endif
                        this.isSuspended = true;
                        break;
                    default:
#if DEBUG
                        System.Diagnostics.Debug.WriteLine(string.Format("Unknown power state: {0}", (m.WParam.ToInt32() & 0x000F).ToString("0")));
#endif
                        // Assuming that unknown values mean to power off. This is a WAG.
                        this.isSuspended = true;
                        break;
                }
            }
        }
        base.WndProc(ref m);
    }

    // Change to my refreshing timer.
    /// <summary>
    /// Called when the refresh timer ticks. This invalidates the form, forcing it to be redrawn, which creates a framerate for us.
    /// </summary>
    /// <param name="sender">Who called this method.</param>
    /// <param name="e">Event Arguments.</param>
    private void RefreshTimer_Tick(object sender, EventArgs e)
    {
        if (this.isSuspended)
        {
            // Program is in suspended mode, so don't do anything this update.
            return;
        }
        // Program is not suspended, so invalidate the client area so it can be painted again.
        this.Invalidate();
    }

进行此更改会在调用挂起时停止所有重绘(并停止 GDI+ 计算),并且进行此更改后,屏幕保护程序将使用电源管理设置"行为"。