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Tip of the Day
Home » Tip Bank » C++
Language: C++
Expertise: Beginner
May 2, 1999

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IRQ7 handler

Question:
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.

Answer:
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.

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