c# - 如何检测 Aero Peek 模式是否开启

Question

我正在尝试找出如何检测 Windows 桌面Aero Peek模式是否打开。特别是我需要检测我的窗口内容是否显示或绘制为具有透明背景的框架。我知道我可以从 Aero Peek 中排除我的窗口，但这不是我现在需要的。

TIA

Answer 1

这就是你所追求的吗？

    [DllImport("dwmapi.dll", PreserveSig = false)]
    public static extern bool DwmIsCompositionEnabled();

    public bool IsAeroActive()
    {
        // Check if Aero is enabled;
        if (DwmIsCompositionEnabled())
        {
            return true;
        }
        else
        {
            return false;
        }
    }

    private void button1_Click(object sender, EventArgs e)
    {
        bool aeroEnabled = IsAeroActive();

        if (aeroEnabled)
        {
            MessageBox.Show("Aero is enabled.");
        }
        else
        {
            MessageBox.Show("Aero is disabled.");
        }
    }

Answer 2

当用户通过将鼠标悬停在任务栏图标上来查看窗口时，您的桌面将进入此“ Aero Peek ”模式。如果显示“任务切换器”对象，您可以使用Windows 事件挂钩来跟踪，结合其上的 DWM 模式应该告诉您用户是否正在查看窗口。下面是我为测试这个想法而制作的应用程序（c++，如果将其转换为 c# 有问题，请告诉我）。

#include <stdio.h>
#include <tchar.h>
#include <windows.h>
#include <objbase.h>
#include <Oleacc.h>
#include <iostream>

#define THREAD_MESSAGE_EXIT     WM_USER + 2000

HWINEVENTHOOK eventHook;
HWND taskSwitcherHwnd = 0;

// process event
void CALLBACK HandleWinEvent(HWINEVENTHOOK hook, DWORD event, HWND hwnd, 
                             LONG idObject, LONG idChild, 
                             DWORD dwEventThread, DWORD dwmsEventTime)
{
    if (event == EVENT_OBJECT_SHOW) 
    {
        IAccessible* pAcc = NULL;
        VARIANT varChild;       
        HRESULT hr = AccessibleObjectFromEvent(hwnd, idObject, idChild, &pAcc, &varChild);  
        if (hr == S_OK && pAcc != NULL)
        {
            BSTR accName;
            pAcc->get_accName(varChild, &accName);
            if (wcscmp(accName, L"Task Switcher")==0)
            {
                std::cout << "Aero Peek on\n";
                taskSwitcherHwnd = hwnd;
            }
            SysFreeString(accName);
            pAcc->Release();
        }
    }
    else if (event == EVENT_OBJECT_HIDE && taskSwitcherHwnd!=0 && taskSwitcherHwnd==hwnd)
    {
        std::cout << "Aero Peek off\n";
        taskSwitcherHwnd = 0;
    }
}

// thread proc for messages processing
// needed for event's hook to work
DWORD WINAPI TreadProc(LPVOID n)
{
    std::cout << "InitializeEventHook\n";
    CoInitialize(NULL);
    eventHook = SetWinEventHook(
        EVENT_OBJECT_SHOW, EVENT_OBJECT_HIDE,   
        NULL, HandleWinEvent, 0, 0, 
        WINEVENT_OUTOFCONTEXT | WINEVENT_SKIPOWNPROCESS);   

    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0))
    {
        if (msg.message==THREAD_MESSAGE_EXIT) 
        {
            break;
        }
        else
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
    }

    std::cout << "ShutdownEventHook\n";
    UnhookWinEvent(eventHook);
    CoUninitialize();
    return 0;
}

int _tmain(int argc, _TCHAR* argv[])
{
    std::cout << "Detect Aero Peek\n";

    DWORD threadId;
    int value = 0;
    HANDLE hThread = CreateThread( NULL, 0, TreadProc, &value, 0, &threadId);

    char a;
    std::cin >> a;

    PostThreadMessage(threadId, THREAD_MESSAGE_EXIT, 0, 0);
    WaitForSingleObject(hThread, 10000);
    CloseHandle(hThread);

    return 0;
}

希望这会有所帮助，问候

Answer 3

如果您从 Windows 注册表中读取，您可以在其中找到 Aero Peek 的状态

\HKEY_CURRENT_USER\Software\Microsoft\Windows\DWM

是一个名为EnableAeroPeek的 DWORD 值，设置如下：

1 = 启用 0 = 禁用

只需比较 0 或 1 即可了解 AeroPeek 是否开启。

在 C# 中是这样的：

Using Microsoft.Win32;

...

RegistryKey AeroPeek = Registry.CurrentUser.OpenSubKey("SOFTWARE\\Microsoft\\Windows\\DWM", true);
       if ((int)AeroPeek.GetValue("EnableAeroPeek") == 1)
        {
            MessageBox.Show("Aero Peek is ON");
        }
        else MessageBox.Show("Aero Peek is OFF");

您还可以更改这些值，Aero Peek 状态将立即更改。