How can this be done - powershell msgbox

Posted on 2014-02-27
Medium Priority
Last Modified: 2014-03-06
Alright, i know the following can be locally on my computer to display a message box
[system.windows.forms.messagebox]::Show("YOur system needs to be accesses for maintence please finish all your work")

Open in new window

but how the heck can i get it to show on remote computers? I know i can use the msg command that is built into windows but some systems don't have that function.

i'm guessing something along the lines of
$creds = get-credential
.... -computername testbox -credential $cred | [show.windows.form.messagebox]::Show("message here")

Open in new window

Question by:bbimis
  • 2
  • 2
LVL 72

Accepted Solution

Qlemo earned 1000 total points
ID: 39893444
Put all of the code to execute into a scriptblock, and run it with invoke-command:
invoke-command -computer testbox -script {<#code here>}

Open in new window

LVL 42

Assisted Solution

footech earned 1000 total points
ID: 39893558
I was thinking the same thing, but it looks like you run into an error since it's an interactive element.
There's probably some way to do this with Windows forms, I just don't know it yet.
One thing I found did work on Win7 system is to use a  combination of PowerShell Remoting and msg.exe.
$block = { msg console /time:15 "Message to user"}
Invoke-Command -ComputerName computername -ScriptBlock $block

Open in new window


Author Comment

ID: 39895632
well wouldn't msg /server:[computername] * "message here" do the same thing ?
that works on windows 7 machines if they have the built in msg

my goal is along these lines but i can't figure out how to get the code to work.
$computer = "testpc"
Send-NetMessage "testing" -Computername $computer -Seconds 30 -VerboseMsg -Wait

Function Send-NetMessage{
    Sends a message to network computers
    Allows the administrator to send a message via a pop-up textbox to multiple computers
    Send-NetMessage "This is a test of the emergency broadcast system.  This is only a test."
    Sends the message to all users on the local computer.
    Send-NetMessage "Updates start in 15 minutes.  Please log off." -Computername testbox01 -Seconds 30 -VerboseMsg -Wait
    Sends a message to all users on Testbox01 asking them to log off.  
    The popup will appear for 30 seconds and will write verbose messages to the console. 

    ".",$Env:Computername | Send-NetMessage "Fire in the hole!" -Verbose
    Pipes the computernames to Send-NetMessage and sends the message "Fire in the hole!" with verbose output
    VERBOSE: Sending the following message to computers with a 5 delay: Fire in the hole!
    VERBOSE: Processing .
    VERBOSE: Processing MyPC01
    VERBOSE: Message sent.
    Get-ADComputer -filter * | Send-NetMessage "Updates are being installed tonight. Please log off at EOD." -Seconds 60
    Queries Active Directory for all computers and then notifies all users on those computers of updates.  
    Notification stays for 60 seconds or until user clicks OK.
    Author: Rich Prescott  
    Blog: blog.richprescott.com
    Twitter: @Rich_Prescott

    Write-Verbose "Sending the following message to computers with a $Seconds second delay: $Message"
    ForEach ($Computer in $ComputerName)
        Write-Verbose "Processing $Computer"
        $cmd = "msg.exe $Session /Time:$($Seconds)"
        if ($Computername){$cmd += " /SERVER:$($Computer)"}
        if ($VerboseMsg){$cmd += " /V"}
        if ($Wait){$cmd += " /W"}
        $cmd += " $($Message)"

        Invoke-Expression $cmd
    Write-Verbose "Message sent."

Open in new window

LVL 42

Expert Comment

ID: 39895754
I believe it depends on whether you have the firewall configured to allow it (referring to whether msg /server would work or not).  It doesn't for me and I haven't tried to diagnose it.  If you have PS Remoting configured then the network communication happens over that so you don't have to worry about any additional firewall configuration.

That script is just a wrapper for msg.exe.

Author Closing Comment

ID: 39910318

Featured Post

Problems using Powershell and Active Directory?

Managing Active Directory does not always have to be complicated.  If you are spending more time trying instead of doing, then it's time to look at something else. For nearly 20 years, AD admins around the world have used one tool for day-to-day AD management: Hyena. Discover why

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Recently we ran in to an issue while running some SQL jobs where we were trying to process the cubes.  We got an error saying failure stating 'NT SERVICE\SQLSERVERAGENT does not have access to Analysis Services. So this is a way to automate that wit…
In this post we will be converting StringData saved within a text file into a hash table. This can be further used in a PowerShell script for replacing settings that are dynamic in nature from environment to environment.
Exchange organizations may use the Journaling Agent of the Transport Service to archive messages going through Exchange. However, if the Transport Service is integrated with some email content management application (such as an anti-spam), the admin…
Loops Section Overview

597 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question