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从任务计划程序运行的PowerShell脚本中的Msgbox无法正常工作

[英]Msgbox in PowerShell script run from task scheduler not working

I have a PowerShell script that creates a schedule task to launch the script. 我有一个PowerShell脚本,该脚本创建计划任务以启动脚本。 The idea is there are some task in the script that requires reboot. 这个想法是脚本中有一些任务需要重新启动。 At the end of the PowerShell a message box should prompt the user to let the user knows that all the tasks are completed. 在PowerShell的末尾,将出现一个消息框,提示用户让用户知道所有任务都已完成。 What am i doing wrong? 我究竟做错了什么?

Add-Type -AssemblyName PresentationFramework

TaskName = "Run Agents Install Script"
$TaskDescription = "Run Agents Install Script at logon"
$Action = New-ScheduledTaskAction -Execute 'Powershell.exe' `
  -Argument "-executionpolicy remotesigned -File $PSScriptRoot\AgentInstall.ps1"
$Trigger =  New-ScheduledTaskTrigger -AtLogOn

Register-ScheduledTask -Action $Action -Trigger $Trigger -TaskName $TaskName -Description $TaskDescription -User "System"


$MsgBoxInput =  [System.Windows.MessageBox]::Show('Installation completed successfully.','Agent Install','OK')
Switch  ($MsgBoxInput) {
    'OK' 
   {

$MsgBoxInput =  [System.Windows.MessageBox]::Show('WARNING! Please install Imprivata agent manually if applicable.','Agent Install','OK')
   }
}

One option is to use the Terminal Services API to send a message to the console. 一种选择是使用终端服务API将消息发送到控制台。 Unfortunately, it is native API, so you need to use .NET interop to call it, but in this case it isn't too tricky: 不幸的是,它是本机API,因此您需要使用.NET interop来调用它,但是在这种情况下,它并不是很棘手:

$typeDefinition = @"
using System;
using System.Runtime.InteropServices;

public class WTSMessage {
    [DllImport("wtsapi32.dll", SetLastError = true)]
    public static extern bool WTSSendMessage(
        IntPtr hServer,
        [MarshalAs(UnmanagedType.I4)] int SessionId,
        String pTitle,
        [MarshalAs(UnmanagedType.U4)] int TitleLength,
        String pMessage,
        [MarshalAs(UnmanagedType.U4)] int MessageLength,
        [MarshalAs(UnmanagedType.U4)] int Style,
        [MarshalAs(UnmanagedType.U4)] int Timeout,
        [MarshalAs(UnmanagedType.U4)] out int pResponse,
        bool bWait
     );

     static int response = 0;

     public static int SendMessage(int SessionID, String Title, String Message, int Timeout, int MessageBoxType) {
        WTSSendMessage(IntPtr.Zero, SessionID, Title, Title.Length, Message, Message.Length, MessageBoxType, Timeout, out response, true);

        return response;
     }

}
"@

Add-Type -TypeDefinition $typeDefinition

[WTSMessage]::SendMessage(1, "Message Title", "Message body", 30, 36)

This is essentially a thin wrapper to the WTSSendMessage function. 从本质上讲,这是WTSSendMessage函数的精简包装。

You will need to get the SessionID via some tool like query . 您将需要通过诸如query工具获取SessionID This script might help with that: Get-UserSession . 该脚本可能会帮助您: Get-UserSession

The TimeOut value here is 30, which means the pop-up will wait 30 seconds before returning with a value of '32000'. 这里的TimeOut值为30,这意味着弹出窗口将等待30秒,然后返回值32000。 Set to '0' to wait forever. 设置为“ 0”将永远等待。

The MessageBoxType is a combination of the values for uType here: MessageBox Function . MessageBoxType是此处uType的值的组合: MessageBox Function So the '36' in the example is a combination of the values for 'MB_YESNO' and 'MB_ICONQUESTION', so will show a message with a question mark icon and 'yes'/'no' buttons. 因此,示例中的“ 36”是“ MB_YESNO”和“ MB_ICONQUESTION”的值的组合,因此将显示带有问号图标和“是” /“否”按钮的消息。 Note that the documentation gives the values in hexadecimal, so you'll need to convert them. 请注意,文档以十六进制形式提供值,因此您需要对其进行转换。

I tested this as a scheduled task running as an admin and it was able to show a message on the desktop of a different logged on user. 我将其作为管理员运行的计划任务进行了测试,它能够在其他登录用户的桌面上显示一条消息。 hope it helps. 希望能帮助到你。

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