Windows 7 Device Driver (Addison-Wesley Microsoft Technology Series)

“The bankruptcy on programming a KMDF motive force offers an outstanding instance for readers to work out a driving force being made.”

–Patrick Regan, community administrator, Pacific Coast Companies


The First Authoritative advisor to Writing powerful, High-Performance home windows 7 gadget Drivers


Windows 7 equipment driving force brings jointly all of the details skilled programmers have to construct quite trustworthy, high-performance home windows 7 drivers. across the world popular motive force improvement specialist Ronald D. Reeves indicates how one can utilize Microsoft’s robust new instruments and types; keep time and cash; and successfully bring good, powerful drivers.


Drawing on his unsurpassed adventure as either a driving force developer and teacher, Reeves demystifies Kernel and person Mode motive force improvement, home windows motive force beginning (WDF) structure, motive force debugging, and plenty of different key issues. all through, he offers top practices for all elements of the driving force improvement method, illuminating his insights with confirmed pattern code. find out how to

  • Use WDF to minimize improvement time, enhance method balance, and increase serviceability
  • Take complete good thing about either the consumer Mode motive force Framework (UMDF) and the Kernel Mode driving force Framework (KMDF)
  • Implement most sensible practices for designing, constructing, and debugging either consumer Mode and Kernel Mode Drivers
  • Manage I/O requests and queues, self-managed I/O, synchronization, locks, plug-and-play, strength administration, gadget enumeration, and more
  • Develop UMDF drivers with COM
  • Secure Kernel Mode Drivers with secure defaults, parameter validation, counted UNICODE strings, and secure equipment naming techniques
  • Program and troubleshoot WMI help in Kernel Mode Drivers
  • Utilize complex a number of I/O queuing techniques

Whether you’re developing home windows 7 drivers for laboratory gear, communications undefined, or the other equipment or know-how, this ebook might help you construct construction code extra quick and get to industry sooner!

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The driving force calls IUnknown::QueryInterface to request a brand new interface from an present WDF item. you may also obtain an Interface via a motive force technique. the 1st case is the best. for instance, whilst the UMDF run time calls a driver’s IDriverEntry::OnDeviceAdd technique, it passes a pointer to the gadget object’s IWDFDriver interface. Wow! book 118 bankruptcy five utilizing COM to improve UMDF Drivers the next instance exhibits this job: HRESULT CMyDriver::OnDeviceAdd( __in IWDFDriver *FxWdfDriver, __in IWDFDeviceInitialize *FxDeviceInit ) { // set up the motive force within the machine stack } you could then use FxWdfDriver to entry the equipment at the motive force object’s IWDFDriver interface. don't unlock FxWdfDriver while you're accomplished with it. The caller guarantees that the item is still legitimate throughout the scope of the strategy name. otherwise to create a WDF item is through calling the perfect UMDF item construction procedure. for instance, to create a request item, name the UMDF equipment object’s IWDFDevice::CreateRequest strategy. when you examine the UMDF reference within the home windows motive force equipment (WDK), you will discover syntax like that for IWDFDevice::CreateRequest: HRESULT CreateRequest( IN IUnknown* pCallbackInterface, IN IWdfObject* pParentObject, OUT IWDFIoRequest** ppRequest ); ppRequest is an OUT parameter that gives an tackle at which the CreateRequest technique can shop a pointer to the newly created request object’s IWDFObject interface. the subsequent process and pattern convey the way to deal with such parameters, by utilizing a decision to CreateRequest through the UMDF’s fx2_driver pattern for instance. we'd claim a variable, pWdfRequest, to carry a pointer to IWDFloRequest. Then we might cross a connection with pWdfRequest to CreateRequest as follows: IWDFIoRequest *pWdfRequest = NULL; … hr = m_FxDevice- >CreateRequest ( NULL, NULL, &pWdfRequest); whilst CreateRequest returns, pWdfRequest holds a pointer to an IWDFIoRequest interface. while the caller has entire with pWdfRequest, it may liberate the interface pointer via calling IUnknown::Release. Wow! book 5. 2 utilizing UMDF COM items 119 one other strategy is to name QueryInterface to request a brand new interface. gadgets can divulge a couple of interface. occasionally, you've gotten a pointer to at least one interface and want a pointer to a different interface at the comparable item. if so, name IUnknown::QueryInterface to request the specified pointer. cross QueryInterface the IID of the specified interface and the tackle of the interface pointer, and QueryInterface returns the asked pointer. while the caller is completed with the interface pointer, the caller should still liberate it. the next is an instance: VOID CMyDevice::StartTarget ( IWDFIoTarget * pTarget) { IWDFIoTargetStateManagement * pStateMgmt = NULL; HRESULT hrQI = pTarget->QueryInterface(IID_PPV_ARGS(&pStateMgmt)); … } this instance requests an IWDFIoTargetStateManagement interface pointer from the UMDF’s I/O aim item. It makes use of the IID_PPV_ARGS macro—declared in objbase.

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