Driver files usually come in disks with any new hardware device or peripheral that you may purchase. However, if you wish to upgrade your device drivers in order to make your system function more efficiently, you will have to download those from the internet. Driver files are some of the most important files in your PC, besides the operating system.
These files should be updated at regular intervals in order to keep your PC running in a problem-free, efficient manner. Home Articles Different file types associated with drivers.
DLL files are executable files, meaning these can be called and run by a loader program, either belonging to the operating system itself, or a third party software utility. If the application is packaged in a setup. In order to allow code sharing between UWP device apps and printer extensions, this sample uses two projects: PrinterExtensionLibrary a C and ExtensionSample a printer extension that is dependent on the PrinterExtensionLibrary.
The code snippets shown in this topic are all taken from the PrinterExtensionSample solution. The code comments in the PrinterExtensionLibrary from the sample document also include code comments that indicate the underlying COM interface that a particular object corresponds to.
When you are developing a printer extension, there are six main areas of focus that you must be aware of. These focus areas are shown in the following list. Printer extensions are registered with the print system by specifying a set of registry keys or by specifying the application information in the PrinterExtensions section of the v4 manifest file.
There are specified GUIDs that support each of the different entry points for printer extensions. The following table shows the GUID values for the two entry points. Printer extensions that are installed outside of the printer driver need to be registered using the registry. This ensures that printer extensions can be installed regardless of the status of the spooler, or the v4 configuration module on the client machine.
Once the PrintNotify service starts, it will check for registry keys under the [OfflineRoot] path and process any pending registrations or unregistrations.
Once any pending registrations or unregistrations are completed, the registry keys are deleted in real time. Incomplete or malformed keys are not deleted. This registration is only necessary on first install. The following example shows the correct registry key format used for registering printer extensions.
Since printer extensions can run in both a user-launched context and an event-launched context, it is useful to be able to determine the context in which your printer extension is operating.
This can allow an app to, for example, not enumerate the status on all queues if it has been launched for a notification or print preferences. Microsoft recommends that printer extensions which are installed separately from the driver e.
Since printer extensions that are installed with the driver are installed to the DriverStore, these will not be launched outside the print preferences or printer notifications events.
Therefore specifying command line switches is unsupported in this case. For example, for a printer extension app with the name printerextension. At runtime, printer extensions must enable event triggering for the current PrinterDriverID. This is the PrinterDriverID that was passed to the app via the args[] array, and it allows the print system to provide an appropriate event context for handling reasons like print preferences or printer notifications.
The following code snippet illustrates this approach. If an app does not call EnableEvents within 5 seconds, Windows will timeout and launch a standard UI. In order to mitigate this, printer extensions should follow the latest performance best practices, including the following:. Delay as much of the app initialization as possible, until after you call EnableEvents. After this, prioritize UI responsiveness by using asynchronous methods and not blocking the UI thread during initialization.
Use ngen to generate a native image during installation. For more information, see Native Image Generator. Use performance measurement tools to find performance issues on loading.
For more information, see Windows Performance Analysis Tools. After an OnDriverEvent handler is registered and events are enabled, if the printer extension was launched to handle print preferences or printer notifications, then the handler will be invoked.
In the preceding code snippet, a method called OnDriverEvent was registered as the event handler. In the following code snippet, the PrinterExtensionEventArgs parameter is the object that enables the print preferences and printer notifications scenarios to be constructed. In order to prevent a bad user experience associated with crashing or slow printer extensions, Windows implements a timeout if EnableEvents is not called within a short amount of time after the app is launched.
To enable debugging, this timeout is disabled if there is a debugger attached to the PrintNotify service. In most cases, however, all the app-related code in which we're interested, runs during or after the OnDriverEvent callback.
Software that open drv file. Add comment. System file type. Dangerous and malicious file type. The drv file extension is traditionally used for for device drivers in Windows environment. A device driver, or software driver is a computer program allowing higher-level computer programs to interact with a device. A driver typically communicates with the device through the computer bus or communications subsystem to which the hardware is connected. When a calling program invokes a routine in the driver, the driver issues commands to the device.
Once the device sends data back to the driver, the driver may invoke routines in the original calling program. Drivers are hardware-dependent and operating-system-specific.
They usually provide the interrupt handling required for any necessary asynchronous time-dependent hardware interface. Microsoft Windows. Company or developer: Microsoft Corporation.
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