Advanced Windows PowerShell Scripting Video Training

Advanced Windows PowerShell Scripting Video Training
Advanced Windows PowerShell Scripting Video Training

Thursday, August 29, 2013

Getting information back from a Message Box with PowerShell

Sometimes I want a script to run automatically, but still prompt me before it takes an action.  A neat way of doing this is with a pop up message box.  Utilizing the MessageBox class from the .NET Framework, we can do just that.  For example, maybe I have a script that notifies me with the Dow Jones Industrial Average drops by 300 points in the current trading session.  Hey, that is a money making opportunity! 
1
2



3
4
5
6
[System.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms")
$Answer = [Windows.Forms.MessageBox]::Show("DJIA has dropped by 300 points today `n Do you want to `n go to your IRA?", "Trade Alert",
          [Windows.Forms.MessageBoxButtons]::YESNO,
          [Windows.Forms.MessageBoxIcon]::Information)

If ($Answer -eq "Yes")
{
    Write-Host "Do Something."
}
Essentially, line 1 gives us access to the Windows Forms objects.
Line 2 Saves the answer of our message box in a the variable $Answer.  To control the type of message box that we display, we have several options. 

The Windows.Forms.MessageBox class is overloaded.  That means that you can implement it in several different ways.  In this instance, we are using the Show method.  Take a look at the screen shot below of the many different versions of the Show method for this class:
image
What differentiates each call to the MessageBox class is the number of arguments and their data types that you pass to the class.  In this case, we passing the 7th item which is String, String, MessageBoxButtons, MessageBoxIcon.
Clicking on this item, we are taken to the MessageBox.Show Method (String, String, MessageBoxButtons, MessageBoxIcon) method on MSDN.  Here we can see that the first string is the message and the second is the caption on the message box window.
image
From here, if we click on System.Windows.Forms.MessageBoxButtons, we can see the types of buttons that we have access to.
image
In this example, we are using YesNo. Yes or No will be returned and stored in $Answer
We are also choosing an icon for this message box from MessageBoxIcon. Here are valid options are:
image
In the end, this is what you will see:
image
Either the string Yes or No will be returned when the appropriate button is clicked.

No comments: