Events with powershell

Does powershell know how to deal with events?

For e.g.:

I create a windows form with a button, how do i know that the button was
pressed in power shell?

Roy wrote:
> Does powershell know how to deal with events?
>
> For e.g.:
>
> I create a windows form with a button, how do i know that the button was
> pressed in power shell?

It /should/ be something like this:

Create a function with the right signature:

function onPress($sender,$e) { ... }

then:

$button = new-object Windows.Forms.Button
$button.add_Click(onPress)


But I don't have PowerShell here, so somebody correct me if I'm wrong. :-)

add_click takes a scriptblock

so
$button.add_click({write-host "it was clicked" })

or i suppose in your example

$button.add_click({onPress})

klumsy@xtra.co.nz wrote:
> add_click takes a scriptblock
>
> so
> $button.add_click({write-host "it was clicked" })
>
> or i suppose in your example
>
> $button.add_click({onPress})

Given that scriptblocks are basically inline functions, it's a shame
they can't be used interchangeably.

Functions and scriptblocks can be used interchangably but not quite the way
you expect. If you have a function onClick, then you can bind it to an event
handler by doing

$button.add_Click($functionnClick)

You can't simply say onClick because that looks like a command invocation
rather than getting a reference to the function itself. (In fact if you just
specify the name of the command by itself, you'll get an error. You have to
enclose a command invocation in parens to invoke it. This is one area where
we require you to be explicit about your intent.)

-bruce

--
Bruce Payette [MSFT]
Windows PowerShell Technical Lead
Microsoft Corporation
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"Adam Milazzo" <adamm@san.rr.com> wrote in message
news:u3T6PkTBHHA.204@TK2MSFTNGP04.phx.gbl...
> klumsy@xtra.co.nz wrote:
>> add_click takes a scriptblock
>>
>> so
>> $button.add_click({write-host "it was clicked" })
>>
>> or i suppose in your example
>>
>> $button.add_click({onPress})
>
> Given that scriptblocks are basically inline functions, it's a shame they
> can't be used interchangeably.

Cool stuff!

function onClick($sender,$e) {write-Host $textbox.text};

[reflection.assembly]::loadwithpartialname("system.windows.forms");
$window = New-Object windows.forms.form;
$window.Size = New-Object system.drawing.size @(200,200);
$textbox = new-Object windows.Forms.TextBox;
$button = new-Object windows.Forms.Button;
$button.add_click($functionnClick);
$button.Left = 100;
$window.Controls.add($textbox);
$window.Controls.Add($button);
$window.ShowDialog();