Re: use createfile to access usb device

Thank Andrue,thank Doron,thank you very much!
Finally i got it worked following your directions.

"Andrue Cope" wrote:

> Doron Holan [MS] wrote:
>
> > GUID_DEVCLAS_USB is a device class. think of a device class a
> > logical grouping. Not all USB devices have the same interface, even
> > though they are of the same bus type.
>
> Gosh - that's pretty much the way I'd worked it out. Nice to know I was
> right.
>
> My current problem is how to enumerate all the devices classes on the
> system. At the moment I'm looking at enumerating
> HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\DeviceClasses\
>
> Perhaps whyitbe could do the same - 'all' he then needs is to issue a
> IOCTL_SCSI_GET_INQUIRY_DATA and compare the manufacturer ID. My only
> concern is that I /think/ I remember when we were developing our IOCTL
> handling class that some non-SCSI devices react badly to
> IOCTL_SCSI_GET_INQUIRY_DATA requests.
>
.

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