Win32 ::SetForegroundWindow() not working all the time

In the official document of Win32 API, there are remarks:

Remarks The system restricts which processes can set the foreground window. A process can set the foreground window only if one of the following conditions is true:

• The process is the foreground process.
• The process was started by the foreground process.
• The process received the last input event.
• There is no foreground process.
• The process is being debugged.
• The foreground process is not a Modern Application or the Start Screen.
• The foreground is not locked (see LockSetForegroundWindow).
• The foreground lock time-out has expired (see SPI_GETFOREGROUNDLOCKTIMEOUT in SystemParametersInfo).
• No menus are active.

But there is a trick to force a window to foreground:

The trick is to make windows ‘think’ that our process and the target window (hwnd) are related by attaching the threads (using AttachThreadInput API) and using an alternative API: BringWindowToTop.

void CommonHelpers::forceForegroundWindow(HWND hwnd) {
    DWORD windowThreadProcessId = GetWindowThreadProcessId(GetForegroundWindow(),LPDWORD(0));
    DWORD currentThreadId = GetCurrentThreadId();
    DWORD CONST_SW_SHOW = 5;
    AttachThreadInput(windowThreadProcessId, currentThreadId, true);
    BringWindowToTop(hwnd);
    ShowWindow(hwnd, CONST_SW_SHOW);
    AttachThreadInput(windowThreadProcessId,currentThreadId, false);
}

The original answer is here

P.S: I also dont think you should bring your message app to top if some message is coming up, but still ... this is the solution that working for my Qt App on Windows 10

The system restricts which processes can set the foreground window. A process can set the foreground window only if one of the following conditions is true:

• The process is the foreground process.
• The process was started by the foreground process.
• The process received the last input event.
• There is no foreground process.
• The foreground process is being debugged.
• The foreground is not locked (see LockSetForegroundWindow).
• The foreground lock time-out has expired (see SPI_GETFOREGROUNDLOCKTIMEOUT in SystemParametersInfo).
• No menus are active.

See the SetForegroundWindow() docs for more details.