Vista - events, arguments, etc...

What is the method for a clicked item in a listview?
This is what I have $listview.add_click($functionnClick); BUT
function onClick($sender,$e) {Write-Host "click"};
$sender and $e seem to be NULL...???

I also tried to do this
$lvsi = New-Object windows.forms.listviewitem.listviewsubitem; BUT
that did not work?

Is there a good resource for dealing with events in PS?

Thanks
Chris



[reflection.assembly]::loadwithpartialname("system.windows.forms");

function onStart($sender,$e) {write-Host "service started"};
function onStop($sender,$e) {write-Host "service stopped"};
function onClick($sender,$e) {Write-Host "click"};

function onLoad($sender,$e) {$listbox.items.clear;get-wmiobject
win32_service |
%{$lv=$listview.items.add($_.name);$lv.subitems.add($_.state)} ;};

$window = New-Object windows.forms.form;
$window.Size = New-Object system.drawing.size @(220,600);
$window.Text = "Windows Services";
$window.FormBorderStyle = "FixedDialog";
$window.MaximizeBox= 0;
$button = new-Object windows.Forms.Button;$button.Text = "Start";
$button2 = new-Object windows.Forms.Button;$button2.Text =
"Stop";$button2.Left = 80;
$listview = New-Object windows.forms.listview;$listview.Top =
25;$listview.Height = 550;$listview.width = 210;$listview.view="Details"
$listview.MultiSelect=0;$listview.FullRowSelect =
1;$listview.Columns.Add("Name",125);$listview.Columns.Add("Status",60);
$lvi = New-Object windows.forms.listviewitem;

$button.add_click($functionnStart);
$button2.add_click($functionnStop);
$listview.add_click($functionnClick);
$window.controls.add($listview);
$window.Controls.Add($button);
$window.Controls.Add($button2);
$window.add_shown($functionnLoad);
$window.ShowDialog();

We special-case this pattern so you don't need to declare any parameters.
When a scriptblock is used as an EventHandler, the sender is available in
$this and the event args are available in $_. Also, unless you also need to
use your handler as something other than as an event handler, there is no
need to define it as a function. Simple assignment to a variable is
sufficient.

$myHandler = {Write-Host "click sender: $this eventArgs: '$_'"}
$listview.add_click( $myHandler );

And to answer your other question, listviewsubitem is a nested class so you
have to use the '+' instead of a dot in the typename. (This is an artifact
of the representation that System.Reflection uses to represent the type
name.) So

$o = new-object System.Windows.Forms.listviewitem+listviewsubitem

works properly.

--
Bruce Payette [MSFT]
Windows PowerShell Technical Lead
Microsoft Corporation
This posting is provided "AS IS" with no warranties, and confers no rights.

"fixitchris" <fixitchris@discussions.microsoft.com> wrote in message
news:36CE5D46-69DE-4309-8C9B-31A9A3EF8A87@microsoft.com...
> What is the method for a clicked item in a listview?
> This is what I have $listview.add_click($functionnClick); BUT
> function onClick($sender,$e) {Write-Host "click"};
> $sender and $e seem to be NULL...???
>
> I also tried to do this
> $lvsi = New-Object windows.forms.listviewitem.listviewsubitem; BUT
> that did not work?
>
> Is there a good resource for dealing with events in PS?
>
> Thanks
> Chris
>
>
>
> [reflection.assembly]::loadwithpartialname("system.windows.forms");
>
> function onStart($sender,$e) {write-Host "service started"};
> function onStop($sender,$e) {write-Host "service stopped"};
> function onClick($sender,$e) {Write-Host "click"};
>
> function onLoad($sender,$e) {$listbox.items.clear;get-wmiobject
> win32_service |
> %{$lv=$listview.items.add($_.name);$lv.subitems.add($_.state)} ;};
>
> $window = New-Object windows.forms.form;
> $window.Size = New-Object system.drawing.size @(220,600);
> $window.Text = "Windows Services";
> $window.FormBorderStyle = "FixedDialog";
> $window.MaximizeBox= 0;
> $button = new-Object windows.Forms.Button;$button.Text = "Start";
> $button2 = new-Object windows.Forms.Button;$button2.Text =
> "Stop";$button2.Left = 80;
> $listview = New-Object windows.forms.listview;$listview.Top =
> 25;$listview.Height = 550;$listview.width = 210;$listview.view="Details"
> $listview.MultiSelect=0;$listview.FullRowSelect =
> 1;$listview.Columns.Add("Name",125);$listview.Columns.Add("Status",60);
> $lvi = New-Object windows.forms.listviewitem;
>
> $button.add_click($functionnStart);
> $button2.add_click($functionnStop);
> $listview.add_click($functionnClick);
> $window.controls.add($listview);
> $window.Controls.Add($button);
> $window.Controls.Add($button2);
> $window.add_shown($functionnLoad);
> $window.ShowDialog();

Thanks. I am leaving work now. but I will look this over tonight... Is this
covered in your book?

Chris

I'm lost bruce....sometimes this works... most of the time it does not. I'm
not sure how to use the get_Item method either. i tried FOREACH through the
$this.items[], and just through $this ... I'm missing something. Thanks

$listview_handler= { $this.SelectedItems.item(0).text };

$listview.add_ItemSelectionChanged($listview_handler);



Exception getting "Item": "Exception calling "get_Item" with "1"
argument(s): "InvalidArgument=Valu
e of '0' is not valid for 'index'.

Parameter name: index""

At line:6 char:47

+ $listview_handler= { $this.SelectedItems.item( <<<< 0).text };

I guess I just needed to sleep on this...and I installed PS 1.0 as well.

$listview_handler = { if ($_.isselected -eq 1) {$lv =
$this.items[$_.itemindex]; Write-Host $lv.text } };
$listview.add_ItemSelectionChanged($listview_handler);