Re: [Libusb-win32-devel] setConfiguration

[Dan E. <Dan...@ne...>]

Thanks, I'll try that.

Dan.

Stephan Meyer wrote:
> Try the latest code from the CVS. I modified the driver's
> set_configuration() function. The function's bahaviour is now
> compatible to the Linux version. =20
>=20
> Stephan
>=20
>=20
>> I've spotted what to me seems a pretty major difference between
>> libusb and libusb-win32. In the call to set_configuration, libusb
>> takes the actual configuration value, i.e. the value specified in the
>> configuration descriptor, whereas libusb-win32 takes the index value
>> + 1.=20
>>=20
>> This means that if you have a quirky device which has one
>> configuration called configuration 2, then with libusb you would use
>> set_configuration(2) to set it, whereas on libusb-win32 you would use
>> set_configuration(1). This is a bit troublesome.
>>=20
>> We have been hit by this since a device we are using makes the same
>> error in reverse, it returns the config descriptor by value instead
>> of index, so when windows initially asks for the 0th config
>> descriptor, unless there is a bogus descriptor in the device called
>> configuration 0 (which of course doesn't make sense since config 0
>> is the unconfigured state), the device returns an error. A
>> workaround is to provide 2 config descriptors, one bogus one called
>> 0 and the real one called 1. This is fine on linux since you can
>> select config 1 by calling set_configuration(1), but on windows you
>> have to call set_configuration(2). If someone decided not to have
>> incrementing configuration values you'd be sunk with libusb-win32 at
>> the moment.=20
>>=20
>> Anyway, for the moment I'm just happy that I've worked out what's
>> going on and that I can select my configuration using 2.
>>=20
>> Dan
>>=20
>> =
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> Get stuff done quickly with pre-integrated technology to make your
> job easier Download IBM WebSphere Application Server v.1.0.1 based on
> Apache Geronimo
> =
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