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1. USB BLOCK 1.7.1 REGISTRATION CODE HOW TO
2. USB BLOCK 1.7.1 REGISTRATION CODE DRIVER
3. USB BLOCK 1.7.1 REGISTRATION CODE SOFTWARE
4. USB BLOCK 1.7.1 REGISTRATION CODE CODE
5. USB BLOCK 1.7.1 REGISTRATION CODE WINDOWS

USB BLOCK 1.7.1 REGISTRATION CODE DRIVER

To register the event callbacks, the client driver first specifies pointers to its implementations of the EvtDriverXxx routines in certain WDF structures. Registers certain event callback routines with the framework.

USB BLOCK 1.7.1 REGISTRATION CODE SOFTWARE

For example, in the template code, the client driver allocates resources required for WPP software tracing by calling the WPP_INIT_TRACING macro. In the DriverEntry routine, the driver performs these tasks:Īllocates global resources that are required during the lifetime of the driver. The RegistryPath parameter represents the driver-specific path in the registry. The DriverEntry routine has two parameters: a pointer to the DRIVER_OBJECT structure that is allocated by Windows, and a registry path for the driver. TraceEvents(TRACE_LEVEL_INFORMATION, TRACE_DRIVER, "%!FUNC! Exit") TraceEvents(TRACE_LEVEL_ERROR, TRACE_DRIVER, "WdfDriverCreate failed %!STATUS!", status)

the framework driver object is deleted during driver unload.Īttributes.EvtCleanupCallback = MyUSBDriver_EvtDriverContextCleanup Register a cleanup callback so that we can call WPP_CLEANUP when TraceEvents(TRACE_LEVEL_INFORMATION, TRACE_DRIVER, "%!FUNC! Entry") WPP_INIT_TRACING( DriverObject, RegistryPath )

USB BLOCK 1.7.1 REGISTRATION CODE CODE

The following code example shows the DriverEntry routine generated by the template. The routine performs the driver's initialization tasks and specifies the driver's event callback routines to the framework.

USB BLOCK 1.7.1 REGISTRATION CODE WINDOWS

Because Windows looks for the routine by name, every driver must implement a routine named DriverEntry. It then calls your driver's entry point routine, DriverEntry, and passes a pointer to the structure. Shortly after your driver is loaded, Windows allocates a DRIVER_OBJECT structure that represents your driver. For more information, see Locking Pageable Code or Data. The PAGE section indicates that the code does not have to remain in physical memory all the time it can be written to the page file when it is not in use. The INIT section indicates that the executable code for DriverEntry is pageable and discarded as soon as the driver returns from its DriverEntry. Notice that DriverEntry is marked as INIT, whereas the event callback routines are marked as PAGE. #pragma alloc_text (PAGE, MyUSBDriver_EvtDriverContextCleanup) #pragma alloc_text (PAGE, MyUSBDriver_EvtDeviceAdd) The implementation file, Driver.c, contains the following block of code that uses alloc_text pragma to specify whether the DriverEntry function and event callback routines are in pageable memory. DRIVER_INITIALIZE DriverEntry ĮVT_WDF_DRIVER_DEVICE_ADD MyUSBDriver_EvtDeviceAdd ĮVT_WDF_OBJECT_CONTEXT_CLEANUP MyUSBDriver_EvtDriverContextCleanup For more information about role types, see Declaring Functions by Using Function Role Types for KMDF Drivers. Role types help Static Driver Verifier (SDV) analyze a driver's source code. All of these routines are implemented by the driver. The next block in Driver.h provides function role type declarations for the DriverEntry routine, and EvtDriverDeviceAdd and EvtCleanupCallback event callback routines. Those header files are generated by the template and are discussed later in this topic. Wdfusb.h includes declarations and definitions of structures and methods that are required to communicate with the USB I/O target objects provided by the framework.ĭevice.h, Queue.h, and Trace.h are not included in the WDK. Usb.h and Usbdlib.h include declarations and definitions of structures and routines that are required by a client driver for a USB device. The header file includes various declarations and definitions of methods and structures that you need to compile a KMDF driver. Ntddk.h and Wdf.h header files are always included for KMDF driver development. Driver.hīefore discussing the details of the template code, let's look at some declarations in the header file (Driver.h) that are relevant to KMDF driver development.ĭriver.h, contains these files, included in the Windows Driver Kit (WDK). The complete source code for the driver object is in Driver.h and Driver.c. The driver object represents the instance of the client driver after Windows loads the driver in memory.

USB BLOCK 1.7.1 REGISTRATION CODE HOW TO

These sections provide information about the template code.įor instructions on generating the KMDF template code, see How to write your first USB client driver (KMDF). The code examples are generated by the USB user mode driver template included with Microsoft Visual Studio 2019.

In this topic, you'll learn about the source code for a KMDF-based USB client driver.