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You can only instantiate NET classes via New-Object and the notation in square brackets when the corresponding software component (assembly), where they are located, has been loaded into memory Some assemblies are loaded automatically by WPS In other cases, you have to request loading of the assembly via the class SystemRe ectionAssembly Therefore, to display a dialog window, you rst have to load System WindowsFormsdll Because this assembly is located in the so-called Global Assembly Cache (GAC) of NET, you do not have to indicate a path:
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[SystemRe ectionAssembly]::LoadWithPartialName ("SystemWindowsForms") [SystemWindowsFormsMessageBox]::Show("Text","Heading", [SystemWindowsFormsMessageBoxCases]::OK) 8 USING CLASS LIBRARIES
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TIP Instead of the notation with square brackets, you can also use the integrated WPS type [Type], which creates a NET type object based on a string Therefore, you can write the preceding example in the following way:
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([Type] "SystemRe ectionAssembly")::LoadWithPartialName ("SystemWindowsForms") $msg = [Type] "SystemWindowsFormsMessageBox" $msg::Show("test")
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8
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Object Analysis
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With the help of the commandlet Get-Member, which has previously been used in this book to analyze pipeline contents, you can also analyze the content of a variable containing an object instance You have to keep in mind, however, that the object has to be sent either in a pipeline to Get-Member (that is, $Variable | Get-Member) or that you have to use the parameter name InputObject (Get-Member InputObject $Variable) Not only for Get-Member, but for most of the commandlets, it does not matter whether there are a number of objects in the pipeline or just a single object
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Enumerations
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When using some NET classes (for example, FileSystemRights), you must combine different ags with a binary or operation If you repeat the name of the listing in which the ag is de ned with each ag, you re really overworking your ngertips WPS can pick the respective ag values in the enumeration out of a string with comma separators and link them with a binary or So, instead of
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$Rights= [SystemSecurityAccessControlFileSystemRights]:: Read ` -bor [SystemSecurityAccessControlFileSystemRights]:: ReadExtendedProperties ` -bor [SystemSecurityAccessControlFileSystemRights]:: ReadProperties ` -bor [SystemSecurityAccessControlFileSystemRights]:: ReadPermissions
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you can use the following abbreviation:
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$Rights = [SystemSecurityAccessControlFileSystemRights] "ReadData, ReadExtendedProperties, ReadProperties, ReadPermissions"
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This section examines the basic mechanisms for accessing COM objects
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Create an Instance
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The commandlet New-Object is also used for instantiating classes de ned within the Component Object Model (see Figure 82) In this case, the name of the COM class has to be preceded by the parameter comobject (short, -com) The programmatic identi er (ProgID) has to be indicated as Name The COM class must be listed in the registry of the local system New-Object complies with CreateObject() in Visual Basic/VBScript Listing 81 shows the call of the method GetTempName() from the COM class ScriptingFileSystemObject This method creates a name for a temporary le Listing 81 comps1
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$fso = new-object -com "scripting lesystemobject" $fsoGetTempName()
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8 USING CLASS LIBRARIES
With Listing 82, you open Internet Explorer with a speci c website Listing 82 Creating an Instance of a COM Class
$ie = new-object -com "InternetExplorerApplication" $ieNavigate("http://wwwwindows-scriptingcom") $ievisible = $true
NOTE You do not have to load COM components (COM components are not called assemblies) because the COM infrastructure automatically loads the appropriate DLLs based on the data stored in the registry when the COM component was installed So, you can access all public classes in all installed COM components
8
Using Class Libraries
Figure 82 Instantiation of a COM object in WPS
Get an Existing Instance
A direct equivalent for GetObject() from VB/VBScript to activate an existing object is not available in WPS However, you can load the assembly for Visual Basic NET and use the method GetObject(), which is available there for compatibility reasons Listing 83 shows a document in Microsoft Word on the screen and writes some text in the document: Listing 83 Getting an Existing Instance of a COM Class
$doc = [microsoftvisualbasicinteraction]:: GetObject("C:\temp\documentdoc") $docapplicationvisible = $true $docapplicationselectiontypetext("You successfully created an instance of Word!")