c++ - Win32::SetForegroundWindow() 一直不工作

Question

我正在开发一个消息传递工具。消息窗口是整个应用程序的一部分。当有消息传来时，我需要窗口转到前面。我正在使用这段代码:

    if( m_hwnd == NULL || !::IsWindow(m_hwnd) )
        return E_UNEXPECTED;

    if(::IsIconic(m_hwnd))
    {
        ::ShowWindowAsync( m_hwnd, SW_RESTORE );
    }
    ::SetWindowPos(m_hwnd, HWND_TOP, 0, 0, 0, 0, SWP_ASYNCWINDOWPOS | SWP_NOMOVE | SWP_NOSIZE | SWP_SHOWWINDOW);
    ::SetForegroundWindow(m_hwnd);
    if( pvbProcessed != NULL )
        *pvbProcessed = VARIANT_TRUE;

    return S_OK;

我什至尝试过 TOPMOST，但在某些情况下它仍然不起作用。我还尝试了::BringToFront()。

任何人都可以帮助或解释为什么它不起作用？这是已知的 Microsoft 限制吗？

Answer 1

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.

参见 SetForegroundWindow() docs了解更多详情。