Question

有没有办法在c＃中检测请求前景窗口？我尝试做的是当用户将焦点切换到另一个窗口时暂停进程（而不是进行检测的进程），然后在切换回来时恢复进程。

我设法检测用户何时切换焦点，但由于该过程暂停，我不知道如何检测他们是否尝试切换回来。

编辑：我编写了进程1，它是执行检测和暂停的进程

过程2是我检测用户是否关注它的外部过程（来自过程1）。如果用户从进程2切换他们的焦点，则暂停进程2.当他们切换回来时，恢复它（从进程1）。我不知道的是，如果进程2被暂停，如何检测用户是否会切换回来。

Answer 1

根据受监控的应用程序框架，您可以使用UI自动化获取焦点更改事件，例如（从MSDN复制）：

`AutomationFocusChangedEventHandler focusHandler = null;

/// <summary>
/// Create an event handler and register it.
/// </summary>
public void SubscribeToFocusChange()
{
    focusHandler = new AutomationFocusChangedEventHandler(OnFocusChange);
    Automation.AddAutomationFocusChangedEventHandler(focusHandler);
}

/// <summary>
/// Handle the event.
/// </summary>
/// <param name="src">Object that raised the event.</param>
/// <param name="e">Event arguments.</param>
private void OnFocusChange(object src, AutomationFocusChangedEventArgs e)
{
    // TODO Add event handling code.
    // The arguments tell you which elements have lost and received focus.
    System.Windows.Automation.AutomationElement element = src as System.Windows.Automation.AutomationElement;
    if(element.Current.ProcessId == "MontioredApplicationProcessId")
    {
        //Monitored application has focus!
    }
    else
        //Monitored application does not have focus
}

/// <summary>
/// Cancel subscription to the event.
/// </summary>
public void UnsubscribeFocusChange()
{
    if (focusHandler != null)
    {
        Automation.RemoveAutomationFocusChangedEventHandler(focusHandler);
    }
}`

检测前景暂停窗口的请求

1 个答案: