Question

我在MSDN上关注这些示例代码，以防止Windows 7关闭，直到用户确认：

    private static int WM_QUERYENDSESSION = 0x11;
    private static bool systemShutdown = false;
    protected override void WndProc(ref System.Windows.Forms.Message m)
    {
        if (m.Msg == WM_QUERYENDSESSION)
        {
            MessageBox.Show("queryendsession: this is a logoff, shutdown, or reboot");
            systemShutdown = true;
        }

        // If this is WM_QUERYENDSESSION, the closing event should be
        // raised in the base WndProc.
        base.WndProc(ref m);

    } //WndProc 

    private void Form1_FormClosing(System.Object sender, System.ComponentModel.CancelEventArgs e)
    {
        if (systemShutdown)
        // Reset the variable because the user might cancel the 
        // shutdown.
        {
            systemShutdown = false;
            if (DialogResult.Yes == MessageBox.Show("My application",
                "Do you want to save your work before logging off?",
                MessageBoxButtons.YesNo))
            {
                e.Cancel = true;
            }
            else
            {
                e.Cancel = false;
            }
        }
    }

但我遇到的问题是在一台PC上，即使＆＃34; queryendsession：这是注销，关机或重启＆＃34;显示（因此收到WM_QUERYENDSESSION），Windows 7不会等待用户快速确认和关闭。在其他PC上，这些代码运行良好。所以我想知道发生了什么。非常感谢你。

顺便说一句：我试图在Form1_FormClosing中直接发送e.Cancel = false但没有任何事情发生。系统停机，没有等待。

Answer 1

这就是我上一次想要阻止Windows关闭的方式：

Public Form1()
{
    InitializeComponent();

    SystemEvents.SessionEnding += SessionEndingEvtHandler;          
}

private void SessionEndingEvtHandler(object sender, SessionEndingEventArgs e)
{
    e.Cancel = true;
}

返回FALSE到WM_QUERYENDSESSION无法阻止Windows7关闭

1 个答案: