Win32: Bring a window to top

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try this，it is said coming from M$

    HWND hCurWnd = ::GetForegroundWindow();
    DWORD dwMyID = ::GetCurrentThreadId();
    DWORD dwCurID = ::GetWindowThreadProcessId(hCurWnd, NULL);
    ::AttachThreadInput(dwCurID, dwMyID, TRUE);
    ::SetWindowPos(m_hWnd, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE);
    ::SetWindowPos(m_hWnd, HWND_NOTOPMOST, 0, 0, 0, 0, SWP_SHOWWINDOW | SWP_NOSIZE | SWP_NOMOVE);
    ::SetForegroundWindow(m_hWnd);
    ::SetFocus(m_hWnd);
    ::SetActiveWindow(m_hWnd);
    ::AttachThreadInput(dwCurID, dwMyID, FALSE);

In order to bring a window to top, you should get your window handle,thread handle, the windows thread handle who is in foreground

then we attach our thread to foreground window thread and get input by AttachThreadInput, then we set our window z order
to topmost and then restore its z order to normal, call SetForegroundWindow,SetFocus,SetActiveWindow to make sure our window is brought to top and is active and have focus

then deattach the input queue from the old foreground window thread, make our thread the only one who capture the input events

So why should We call AttachThreadInput, it is because

SetFocus sets the keyboard focus to the specified window. The window must be
attached to the calling thread’s message queue.

What does AttachThreadInput do?

The AttachThreadInput function can be used to allow a set of threads
to share the same input state. By sharing input state, the threads
share their concept of the active window. By doing this, one thread
can always activate another thread’s window. This function is also
useful for sharing focus state, mouse capture state, keyboard state,
and window Z-order state among windows created by different threads
whose input state is shared.

We use SetWindowPos to bring the windows to topmost and show the window if the window is hidding by using SWP_HIDEWINDOW

SetWindowPos function changes the size, position, and Z order of a
child, pop-up, or top-level window. These windows are ordered
according to their appearance on the screen. The topmost window
receives the highest rank and is the first window in the Z order

If your problem is your window is also minimized , you should add one line code to the end

ShowWindow(m_hWnd, SW_RESTORE);

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