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Asked: 2026-05-28T06:38:19+00:00

I would like to write some C++ program that can detect the presence of

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I would like to write some C++ program that can detect the presence of an USB expansion card, or an SD card reader without it necessarily having anything plugged in to it. Is this possible? In Linux?

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  1. Editorial Team

    if you know the exact vendor id and/or product id you could search for it, like this:

    for (bus = busses; bus; bus = bus->next)
for (dev = bus->devices; dev; dev = dev->next)
  if ((dev->descriptor.idVendor == vendor) && (dev->descriptor.idProduct == product))
    return dev;

    libusb tutorial

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