How to use the IVirtualDesktopManager interface in C++/Win32

Question

I need to search for maximized windows from Win32 (by using EnumWindows) but I also want to filter for windows which are on the current virtual desktop. On MSDN, I

Answer 1

IVirtualDesktopManager is a COM interface. You need to instantiate the COM object that implements the interface.

Based on code from this blog, you can use IServiceProvider to access IVirtualDesktopManager (and IVirtualDesktopManagerInternal, which has much more functionality than IVirtualDesktopManager has), eg:

IServiceProvider* pServiceProvider = NULL;
HRESULT hr = ::CoCreateInstance(
    CLSID_ImmersiveShell, NULL, CLSCTX_LOCAL_SERVER,
    __uuidof(IServiceProvider), (PVOID*)&pServiceProvider);

if (SUCCEEDED(hr))
{
    IVirtualDesktopManager *pDesktopManager = NULL;
    hr = pServiceProvider->QueryService(__uuidof(IVirtualDesktopManager), &pDesktopManager);

    if (SUCCEEDED(hr))
    {
        BOOL bIsOnCurrentDesktop = FALSE;
        hr = pDesktopManager->IsWindowOnCurrentVirtualDesktop(hWnd, &bIsOnCurrentDesktop);

        if (SUCCEEDED(hr))
        {
            // use bIsOnCurrentDesktop as needed...
        }

        pDesktopManager->Release();
    }

    pServiceProvider->Release();
}