寄件者: Jonas Malaco via pyusb-users <pyusb-users@lists.sourceforge.net> 寄件日期: 2021年4月27日 下午 05:16 收件者: pyusb-users@lists.sourceforge.net <pyusb-users@lists.sourceforge.net> 副本: Jonas Malaco <jo...@protocubo.io> 主旨: Re: [pyusb-users] help on win7: Entity not found
On Tue, Apr 27, 2021 at 08:18:09AM +0000, CM-Wu Ben - 吳文鐘 wrote: > Hi, > I got a problem when dealing with control transfer on win7. > > After set backend(libusb1), find usb device, I can send standard/class USB > request via dev.ctrl_transfer() successfully, but failed when sending vendor > request. > > the reason is 'Entity not found' > Is there any restrictions when sending vendor request? Not generally, no. But the OS driver may not support it (e.g. Windows Generic HID). Try running with LIBUSB_DEBUG=4, that may give you some useful information. ------------------ Thanks for your information. I tried to run with LIBUSB_DEBUG=4, and found that it is windows HID driver that handle the request, which does not support it. The device I'm testing is a composite device, which has audio interface within it. Do windows audio driver support the handling of control transfer ? If yes, is it possible to send control transfer via audio driver? how to do it using libusb backend? Thanks 『The information contained in this email and attachment is confidential and is for the use of the intended recipient only. Any disclosure, copying or distribution of this email and attachment without the sender's consent is strictly prohibited. If you are not the intended recipient, please promptly notify the sender and delete this email and attachment entirely without using, retaining, or disclosing any of its contents. The recipient is responsible for ensuring that this email is virus free and the sender accepts no liability for any damages caused by virus transmitted by this email.』
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