Re: [libusb] [winusbx_submit_control_transfer] ControlTransfer failed: [87] The parameter is incorrect.

[Raymond B. <ray...@gm...>]

On Mon, Jun 24, 2024 at 10:56 PM Tim Roberts <ti...@pr...> wrote:

> On 6/24/24 1:45 PM, Raymond Bian wrote:
>
> > Hello, I am trying to use libusb and libusb-win32 (1.4.0.0) to create
> > a network tether between a windows and iDevice. In order to enable
> > this, the iDevice USB configuration needs to be set to configuration 5
> > (1-indexed). However, I was not able to properly set any configuration
> > on this device other than configuration 0 and configuration 1, the
> > default.
>
> Multi-configuration devices are problematic even under the best of
> conditions in Windows.  Most manufacturers avoid them because of this.
> It's true that WinUSB doesn't directly support them. Have you tried
> superstitiously closing the device and reopening it?
>
> --
>
> Tim Roberts, ti...@pr...
> Providenza & Boekelheide, Inc.
>

 I was able to successfully set the configuration for the device after
installing the libusb-win32 driver for the entire composite device, using
the libusb-win32 api directly. It seems there may have been some mixup on
which backend was chosen.