How can I handle in Windows an IRQ7 interrupt, generated by my own measurement device connected to parallel port? It was easy in DOS. Any generic code would be appreciated.
Yes, it was much easier in DOS. You could just point the desired interrupt vector to your own interrupt handler. Under Win32, however, you cannot even invoke an interrupt from application code–it will cause an exception fault.
Under Win32, any code that must either invoke or handle interrupts must be implemented as a device driver.
These same limitations did not exist in older 16-bit Windows, but were still more difficult than it was under DOS.