kmdf

I am quite new to driver development and trying to write a simple filter driver that will enable or disable a keyboard or mouse device. If I can make it work, I want to use it to disable the touchpad on my laptop when a mouse is plugged in. I realize there is probably software out there that does this already, but I am really interested in device drivers and want to learn how to do this myself. I am using the kbfiltr and moufiltr examples that ship with the WDK, installed as upper filter drivers. The kbfiltr example creates a pdo which can be enumerated and connected to by a usermode program.

My platform is x86 and x86-64, on Windows. The point of the interrupt priority system is to have the highest priority interrupt beat out the others. To enforce this, I'm guessing that Windows will disable all interrupts of lower level completely, until the ISR for the higher-level interrupt is complete. But if the CPU isn't listening to interrupts, what happens? Do they just silently disappear? Or are they queued in hardware, waiting for interrupts to become enabled again? If they are stored, where? Are there limitations to how many can queue up? What happens if too many interrupts go

I am trying to convert a C++ struct to C but keep getting "undeclared identifier"? Does C++ have a different syntax for referring to structs? struct KEY_STATE { bool kSHIFT; //if the shift key is pressed bool kCAPSLOCK; //if the caps lock key is pressed down bool kCTRL; //if the control key is pressed down bool kALT; //if the alt key is pressed down }; I am using a variable of type KEY_STATE inside another structure: typedef struct _DEVICE_EXTENSION { WDFDEVICE WdfDevice; KEY_STATE kState; } DEVICE_EXTENSION, *PDEVICE_EXTENSION; results in error C2061: syntax error : identifier 'KEY_STATE' ..