qt usb interface

[anan1975]

hi,
I m new to qt Please suggest i want to make a application like switch on and off an led on usb port Please suggest the software and hardware.
Thanking you
Anand

[kuzulis]

In general first, to learning the specification USB, to understand that this is impossible.
Second, to control the USB device must have a driver for this device. In this case, the device should be opened by CreateFile(), and control through the DeviceIoControl()
(ie for Windows - use the Win32 API). For other platforms - the same, similar way.

In any case, you must have a driver (either standard or Vendor-specific).

PS: Qt this has nothing to do.