I'm not sure what the problem is there, although I did not create the
LibUsb implementation. It's possible there is a bug in the LibUsb
implementation that is not correctly detecting the active
configuration number of each device. You may want to open a bug on
the sourceforge page, but I can't guarantee that anyone will work on
it. I have no experience with the libusb implementation.
On Jan 29, 2008 4:28 AM, <[EMAIL PROTECTED]> wrote:
> Hi,
>
> I am working with the Windows implementation in combination with LibUsb.
> Connecting to the root hub and
> discovering devices workes well. But when I try to communicate with devices
> I have to retrieve the
> active configuration to access the interfaces of a device. But no one of
> the devices I tested gives me an
> active configuration:
>
> UsbConfiguration active = device.getActiveUsbConfiguration();
>
> always retuns null and:
>
> if(device.isConfigured()) {
> ...
> }
>
> fails!
>
> In the file FindUsbInterface.java I found a comment saying:
>
> /* If the UsbDevice is not configured, there is not much we can do with it.
> * We could examine all its fields/properties, but the only communication
> * possible is a limited set of Requests on the Default Control Pipe.
> * So for this example we'll ignore unconfigured devices.
> * The OS USB stack normally configures all devices, so we shouldn't run
> into any
> * unconfigured devices.
> */
>
> Why does my OS USB stack not configure my devices??? How could I force this
> configuration, or what am I doing wrong?
>
> Regards,
>
> Markus
>
>
>
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