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WORKING WITH COM IN POWERSHELL
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: http://blogs.msdn.com/powershell/arc hive/2006/07/24/Casting_a_scriptbloc k_to_an_arbitrary_delegate_signature .aspx Busy : False Name : Windows Internet Explorer HWND : 591430 FullName : C:\Program Files\Internet Explorer\i explore.exe Path : C:\Program Files\Internet Explorer\ Visible : True StatusBar : True StatusText : ToolBar : 1 MenuBar : True FullScreen : False ReadyState : 4 Offline : False Silent : False RegisterAsBrowser : False RegisterAsDropTarget : True TheaterMode : False AddressBar : True Resizable : True
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Once again, there are many tantalizing things to play with. For example, there are a couple properties that tell you the title of a window as well as the URL that is being viewed in it. Let s select just those properties.
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PS (15) > $shell.Windows() | >> select-object -first 1 locationname,locationurl | >> fl >> LocationName : Windows PowerShell : Casting a scriptblock t o an arbitrary delegate signature LocationURL : http://blogs.msdn.com/powershell/archive/200 6/07/24/Casting_a_scriptblock_to_an_arbitrar y_delegate_signature.aspx
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We can see that it s pointing at the PowerShell team blog (purely by accident of course). Now let s do something about all those extras that clutter up our browser windows. Let s get rid of the menu bar. First we ll examine its current state:
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PS (10) > $shell.Windows().Item(0).MenuBar True
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The browser window with the menu bar turned on is shown in figure 12.3. Let s turn it off by setting the MenuBar property to $false.
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PS (19) > $shell.Windows().Item(0).MenuBar = $false
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Figure 12.3 A browser window with the menu bar showing. Notice where the menu bar shows up, as we will hide it later on.
Figure 12.4 shows what the window looks like now. The menu bar is gone and we ve reclaimed that space to view our web pages. Here s another useful set of functions. There are three functions is this set. The first is Export-Window, which will grab all of the open window URLs and save then in a script that can be used later on to reopen the windows. We ll save them as a collection of hashtables where the title member of the hashtable contains the window title and the url member holds the URL for that location. The Export-Window function is shown in listing 12.1.
Listing 12.1 The Export-Window function
function Export-Window { param($file=(join-path (resolve-path ~) saved-urls.ps1)) $shellApp = new-object -com Shell.Application $shellApp.Windows() | % { @" @{ title='$($_.LocationName -replace "'","''")' url='$($_.LocationUrl -replace "'","''")' } "@
Default path
Get the windows
D Format hashtable E
Write file
} | out-file -width 10kb -filepath $file ` -encoding Unicode }
Figure 12.4 A browser window after running a PowerShell command to hide the menu bar. Compare this to the previous figure to verify that the menu bar is indeed gone.
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The default place where the data is saved is a file called saved-urls.ps1 B in our home directory. We ll use the Shell.Application object to obtain a list of the windows to save C. A here-string is used to format the information in PowerShell hash literal syntax D. Note that the -replace operator is used to handle embedded single quotes in the either the title or the URL. Finally the text is written out to the file in large blocks encoded as Unicode data E. The next function (see listing 12.2) will reload the saved window descriptions. There is almost nothing to this function it takes the path to the script created by Export-Window and simply executes it.
Listing 12.2 The Import-Window function
function Import-Window { param( $File=(join-path (resolve-path ~) saved-urls.ps1), [switch] $show ) & $file | foreach { if ($Show) { explorer $_.url } else { $_ } } }
The script uses the $show parameter to decide whether it should reopen the windows or simply emit the data. Opening and closing windows is all very nice, but what else can we open We ll look at that next. Example: Opening control panel items Here s one more example using the Shell.Application class: opening a control panel item. This saves us from having to navigate through all those tedious menus. As before, we need an instance of the Shell.Application object.
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