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Ideas for on your own in VB.NET
Ideas for on your own Data Matrix 2d Barcode Creator In Visual Basic .NET Using Barcode creator for .NET Control to generate, create Data Matrix image in .NET framework applications. www.OnBarcode.comData Matrix ECC200 Reader In VB.NET Using Barcode recognizer for VS .NET Control to read, scan read, scan image in .NET framework applications. www.OnBarcode.comseen this technique, but you ll need to reverse it a bit and query the OS class first, then query the BIOS second). Query a list of hotfixes using WMI. (Hint: Microsoft formally refers to these as quick fix engineering). Is the list different from that returned by the Get-Hotfix cmdlet Display a list of services, including their current status, their start mode, and the account they use to log on. Can you find a class that will display a list of installed software products Do you consider the resulting list to be complete ANSI/AIM Code 39 Drawer In VB.NET Using Barcode generation for .NET framework Control to generate, create Code-39 image in Visual Studio .NET applications. www.OnBarcode.comGenerating 2D Barcode In VB.NET Using Barcode creation for VS .NET Control to generate, create Matrix 2D Barcode image in VS .NET applications. www.OnBarcode.com11.9 Ideas for on your own
Paint Data Matrix 2d Barcode In Visual Basic .NET Using Barcode creation for Visual Studio .NET Control to generate, create Data Matrix 2d barcode image in .NET framework applications. www.OnBarcode.comPainting EAN13 In VB.NET Using Barcode maker for .NET framework Control to generate, create EAN-13 Supplement 5 image in .NET framework applications. www.OnBarcode.comThink about some of the things you might want to query from WMI, and see if you can find the classes and properties that expose that information. For example, you might want to find the service pack version of a computer: a service pack modifies the operating system, so you might start your search in a class that has something to do with the operating system (and you ve seen that class name in this chapter). Always try piping the object to Gm or Format-List * to see a full set of properties, or use a WMI explorer tool to review the full set of class properties. Drawing UCC - 12 In Visual Basic .NET Using Barcode encoder for VS .NET Control to generate, create Universal Product Code version A image in Visual Studio .NET applications. www.OnBarcode.comEncoding ISSN In Visual Basic .NET Using Barcode printer for Visual Studio .NET Control to generate, create International Standard Serial Number image in VS .NET applications. www.OnBarcode.comMultitasking with background jobs
Creating Data Matrix ECC200 In Objective-C Using Barcode generator for iPad Control to generate, create ECC200 image in iPad applications. www.OnBarcode.comCreate Data Matrix 2d Barcode In None Using Barcode printer for Microsoft Excel Control to generate, create DataMatrix image in Microsoft Excel applications. www.OnBarcode.comEveryone s always telling you to multitask, right Why shouldn t PowerShell help you out with that by doing more than one thing at a time It turns out that PowerShell can do exactly that, especially for longer-running tasks that might involve multiple target computers. Make sure you ve read chapters 10 and 11 before you dive into this chapter, because we re going to take those remoting and WMI concepts a bit further. Generate PDF 417 In None Using Barcode generator for Software Control to generate, create PDF-417 2d barcode image in Software applications. www.OnBarcode.comCreate Quick Response Code In VS .NET Using Barcode encoder for VS .NET Control to generate, create Quick Response Code image in VS .NET applications. www.OnBarcode.com12.1 Making PowerShell do multiple things at the same time
Barcode Generator In Objective-C Using Barcode drawer for iPhone Control to generate, create Barcode image in iPhone applications. www.OnBarcode.comUPC Symbol Generation In None Using Barcode creation for Office Word Control to generate, create UPC Code image in Word applications. www.OnBarcode.comYou should think of PowerShell as a single-threaded application, meaning that it can only do one thing at once. You type a command, you hit Return, and the shell waits while that command executes. You can t start running a second command until the first finishes. With its background jobs functionality, however, PowerShell has the ability to move a command onto a separate background thread (actually a separate, background PowerShell process). That enables the command to run in the background, while you continue using the shell for something else. You have to make that decision before running the command; after you press Return, you can t decide to move a long-running command into the background. After commands are in the background, PowerShell provides mechanisms to check on their status, retrieve any results, and so forth. Encode USS Code 128 In None Using Barcode printer for Office Excel Control to generate, create USS Code 128 image in Excel applications. www.OnBarcode.comEncoding Data Matrix 2d Barcode In Java Using Barcode generation for BIRT reports Control to generate, create Data Matrix 2d barcode image in BIRT applications. www.OnBarcode.com12.2 Synchronous versus asynchronous
Recognize PDF-417 2d Barcode In None Using Barcode decoder for Software Control to read, scan read, scan image in Software applications. www.OnBarcode.comScanning Barcode In Java Using Barcode scanner for Java Control to read, scan read, scan image in Java applications. www.OnBarcode.comLet s get a few bits of terminology out of the way first. PowerShell runs normal commands synchronously, meaning you hit Return and then wait for the command to GS1 128 Encoder In Java Using Barcode printer for Android Control to generate, create UCC - 12 image in Android applications. www.OnBarcode.comMake Barcode In VS .NET Using Barcode generation for Reporting Service Control to generate, create Barcode image in Reporting Service applications. www.OnBarcode.comCreating a local job
complete. Moving a job into the background allows it to run asynchronously, meaning that you can continue using the shell for other tasks while the command completes. There are a few important differences between running commands in these two ways: When you run a command synchronously, you can respond to input requests. When running commands in the background, there s no opportunity to see input requests in fact, they ll stop the command from running. Synchronous commands produce error messages when something goes wrong. Background commands produce errors, but you won t see them immediately. You ll have to make arrangements to capture them, if necessary. ( 22 discusses that.) If you omit a required parameter on a synchronous command, PowerShell can prompt you for the missing information. On a background command, it can t, so the command will simply fail. The results of a synchronous command start displaying as soon as results become available. With a background command, you wait until the command finishes running and then retrieve the cached results. I typically run commands synchronously to test them out and get them working properly, and only run them in the background after I know they re fully debugged and working as I expect them to. That way, I can ensure that the commands will run without problems, and that they will have the best chance of completing in the background. PowerShell refers to background commands as jobs, and there are several ways to create jobs, along with several commands to manage them.
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