Now that I think about it, and especially as I still have some hope that it
might be possible to pick the Windows 8.1 WinUSB driver and install it on
Windows 7 & Windows 8.0 machines, the right way to find if WinUSB isoc is
supported is to use `GetProcAddress()` on the WinUSB DLL, to see if it has a
`WinUsb_ReadIsochPipe` entry.
Besides, `GetProcAddress()` is already what we're using to get our WinUSB
entrypoints in
[winusbx_init](https://github.com/libusbx/libusbx/blob/master/libusb/os/windows_usb.c#L2543),
so it should be pretty straightforward to check if the address of the calls we
need is NULL in the isoc libusb functions, and return not supported if that's
the case.
/Pete
---
Reply to this email directly or view it on GitHub:
https://github.com/libusbx/libusbx/pull/164#issuecomment-30356211
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