从 Windows 服务启用/禁用 Aero

发布于 2024-07-08 01:03:40 字数 1949 浏览 9 评论 0原文

我有一些代码可以在 Vista 中启用/禁用 Windows Aero 服务，并且我想在 Windows 服务中运行它。该代码在独立应用程序中运行，但是当我从服务运行它时，什么也没有发生。不会引发任何错误或异常。

我意识到在服务中运行代码与在应用程序中运行代码的范围不同，但在这种情况下，我如何从服务中启用/禁用 Aero？这可能吗？

这是我正在使用的代码：

public static readonly uint DWM_EC_DISABLECOMPOSITION = 0;
public static readonly uint DWM_EC_ENABLECOMPOSITION = 1;

[DllImport("dwmapi.dll", EntryPoint="DwmEnableComposition")]
protected static extern uint Win32DwmEnableComposition(uint uCompositionAction);

public static bool EnableAero() 
{
    Win32DwmEnableComposition(DWM_EC_ENABLECOMPOSITION);
}

编辑：

事实证明，DwmEnableComposition 调用返回 HRESULT 0x80070018 或 ERROR_BAD_LENGTH。似乎是一个奇怪的错误，因为代码在不作为服务运行时可以工作。

我还尝试将整个内容更改为以下代码，但得到了相同的结果。它设置了窗口站和桌面，看起来是正确的，但是调用 DwmEnableComposition 会导致相同的错误。为简洁起见，我没有包含 PInvoke 声明。

    protected override void OnStop()
    {
        IntPtr winStation = OpenWindowStation("winsta0", true, 0x10000000 /* GENERIC_ALL */);
        if (winStation == null || winStation.ToInt32() == 0)
        {
            String err = new Win32Exception(Marshal.GetLastWin32Error()).Message;
        }

        if (!SetProcessWindowStation(winStation))
        {
            String err = new Win32Exception(Marshal.GetLastWin32Error()).Message;
        }

        uint thread = GetCurrentThreadId();

        IntPtr hdesk = OpenInputDesktop(0, false, 0x10000000 /* GENERIC_ALL */);
        if (hdesk == null || hdesk.ToInt32() == 0)
        {
            String err = new Win32Exception(Marshal.GetLastWin32Error()).Message;
        }

        if (!SetThreadDesktop(hdesk))
        {
            String err = new Win32Exception(Marshal.GetLastWin32Error()).Message;
        }

        uint result = Win32DwmEnableComposition(DWM_EC_DISABLECOMPOSITION);
        if (result != 0)
        {
            String err = new Win32Exception(Marshal.GetLastWin32Error()).Message;
        }
    }

原文

I have some code to enable/disable the Windows Aero service in Vista, and I would like to run it in a Windows Service. The code works in a standalone application, but when I run it from a Service, nothing happens. No errors or exceptions are thrown.

I realise that running code in a service is a different scope than running code in an application, but in this case, how would I enable/disable Aero from the service? Is this even possible?

Here is the code I am working with:

public static readonly uint DWM_EC_DISABLECOMPOSITION = 0;
public static readonly uint DWM_EC_ENABLECOMPOSITION = 1;

[DllImport("dwmapi.dll", EntryPoint="DwmEnableComposition")]
protected static extern uint Win32DwmEnableComposition(uint uCompositionAction);

public static bool EnableAero() 
{
    Win32DwmEnableComposition(DWM_EC_ENABLECOMPOSITION);
}

Edit:

It turns out that the DwmEnableComposition call is returning HRESULT 0x80070018, or ERROR_BAD_LENGTH. Seems like a strange error, since the code works when not running as a service.

I also tried changing the entire thing to the following code, but got the same result. It sets the window station and desktop, and it seems to be correct, but the call to DwmEnableComposition results in the same error. I've not included the PInvoke declarations for brevity.

    protected override void OnStop()
    {
        IntPtr winStation = OpenWindowStation("winsta0", true, 0x10000000 /* GENERIC_ALL */);
        if (winStation == null || winStation.ToInt32() == 0)
        {
            String err = new Win32Exception(Marshal.GetLastWin32Error()).Message;
        }

        if (!SetProcessWindowStation(winStation))
        {
            String err = new Win32Exception(Marshal.GetLastWin32Error()).Message;
        }

        uint thread = GetCurrentThreadId();

        IntPtr hdesk = OpenInputDesktop(0, false, 0x10000000 /* GENERIC_ALL */);
        if (hdesk == null || hdesk.ToInt32() == 0)
        {
            String err = new Win32Exception(Marshal.GetLastWin32Error()).Message;
        }

        if (!SetThreadDesktop(hdesk))
        {
            String err = new Win32Exception(Marshal.GetLastWin32Error()).Message;
        }

        uint result = Win32DwmEnableComposition(DWM_EC_DISABLECOMPOSITION);
        if (result != 0)
        {
            String err = new Win32Exception(Marshal.GetLastWin32Error()).Message;
        }
    }

分享到QQ

分享到微博