I'm trying to find out how to detect if windows desktop Aero Peek mode is on. In particular I'm need to detect if my window content is shown or drawn as a frame with transparent background. I know I can exclude my window from Aero Peek, but this not what I need at this moment.
TIA
Is this what you are after?
[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.");
}
}
your desktop would go into this " Aero Peek " mode when user is peeking windows by hovering mouse over taskbar icons. You can use windows event hook to trace if " Task Switcher " object is shown, combined with DWM mode on it should tell you if user is peeking a window. Below is an application I made to test this idea (c++, let me know if there are problems converting it to c#).
#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;
}
hope this helps, regards
If you read from windows Registry, there you can find the status of Aero Peek
\\HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\DWM
Is a DWORD value named EnableAeroPeek which is set as following:
1 = Enabled 0 = disabled
Just compare to 0 or 1 to find out if AeroPeek is on.
In C# something like this:
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");
You can also change those values and instantly Aero Peek status will change.
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