printing barcode vb.net CHapTER 17 Managing Devices and Services in C#.NET

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686 CHapTER 17 Managing Devices and Services
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during Windows Setup so that they can be available for device installs when the user first logs on to the system . Beginning with Windows 7, however, the number of in-box device drivers has been reduced considerably because of the inclusion of Windows Update in the default device path . For more information about this change, see the section titled Enhancements to the Device Installation Experience in Windows 7 later in this chapter . Third-party driver packages can be staged in two ways:
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When the device is connected, by using vendor-supplied media and the Add New Hardware Wizard . (The Add New Hardware Wizard is for devices not recognized by PnP .) When the device is disconnected, by using staging tools such as PnPutil .exe or DrvLoad .exe . In addition, many device vendors are likely to provide .exe files that will stage drivers to the driver store .
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You can also stage driver packages on Windows 7 by using the Microsoft Deployment Toolkit 2010 (MDT 2010) . Using MDT 2010, an administrator can stage new drivers with simple drag-and-drop operations . In addition, you can group drivers so that they can be targeted to specific makes and models of computers that require them . For more information on MDT 2010, see Part II, Deployment . Finally, you can stage driver packages by using Windows Automated Installation Kit 2 .0 (Windows AIK 2 .0) to embed them in deployment images . For more information on Windows AIK 2 .0, see Part II .
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There is no hard-coded limit on the size to which the driver store can grow as new
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driver packages are staged. The driver store uses index files that are updated during stages to minimize the performance impact on installation time as the driver store grows in size.
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DRIVER STaGING aND INSTaLLaTION pROCESS
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The driver staging and installation process alternates between user mode and kernel mode as follows:
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The files in the driver package are copied to a temporary secure location within the user profile as Configuration Management Interface (CMI) objects . The driver store then validates trust for the driver package under the LocalSystem context . If verification succeeds, the driver package is copied from the temporary location to the driver store under the LocalSystem context . After the driver package has been added to the store, its INF file is parsed to determine the names and locations of the required driver files . This information is added to the index files for the store . The driver package in the temporary location is then deleted . In addition, during the staging process, a system restore point is created to allow for quick rollback to an earlier state in case installing the driver destabilizes the system .
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Understanding Device Installation and Management CHapTER 17
(You can use Group Policy to disable the creation of automatic restore points when drivers are updated or installed . See the section titled Managing Device Installation Behavior later in this chapter for more information .)
If the driver package needs updating later (for example, if a new version of the driver is released on Windows Update), this is initiated under the User context but takes place under the System context . (This step is optional .) When the PnP service detects the presence of the device, the driver is installed from the driver store under the LocalSystem context . Installation takes place silently and transparently from the user s perspective because no additional prompts for files are needed . Note that a Found New Hardware message balloon may appear above the notification area as the device is being installed, and a second balloon notifies the user after the device is installed . However, you can use Group Policy to disable these notifications . See the section titled Managing Device Installation Behavior later in this chapter for more information .
If the vendor-supplied driver requires the installation of support software (for example, a control center for a display driver) in addition to the core device driver, a Finish Install page is displayed and runs under the User context (requires local administrative privileges or elevation) to allow the user to install the required support software for the device . (This step is optional .)
For more information about driver staging, see the section titled Managing Driver Packages later in this chapter .
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