WDK Mini Filter Example
README.md
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1 Minispy File System Minifilter Driver
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4 The Minispy sample is a tool to monitor and log any I/O and transaction activity that occurs in the system. Minispy is implemented as a minifilter.
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6 ## Universal Windows Driver Compliant
7 This sample builds a Universal Windows Driver. It uses only APIs and DDIs that are included in OneCoreUAP.
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9 Design and Operation
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12 Minispy consists of both user-mode and kernel-mode components. The kernel-mode component registers callback functions that correspond to various I/O and transaction operations with the filter manager. These callback functions help Minispy record any I/O and transaction activity occurring in the system. When a user can request the recorded information, the recorded information is passed to the user-mode component, which can either output it on screen or log it to a file on disk.
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14 To observe I/O activity on a device, you must explicitly attach Minispy to that device by using the Minispy user-mode component. Similarly, you can request Minispy to stop logging data for a particular device.
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16 For more information on file system minifilter design, start with the [File System Minifilter Drivers](http://msdn.microsoft.com/en-us/library/windows/hardware/ff540402) section in the Installable File Systems Design Guide.
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