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As they sometimes do, Microsoft made changes to the way in which the SetupAPI functions list the devices returned by SetupDiGetClassDevs(). In particular, composite devices started returning their interfaces before the parent device, which caused some issues with the way the enumeration logic was assigning things. For composite devices, it appears that the first interface behaves much like the parent device in some regards, so the library was creating a device specifically for the first interface and then again when the actual parent device was encountered. This caused composite devices to appear in the device list twice, with the first instance being unusable for most operations. This commit significantly changes the way in which the enumeration process is done. Previously we would scan for HCDs, hubs, and generic devices, in that order and in distinct passes (obtaining a new listing of devices from SetupAPI). Now we will obtain a single snapshot at the beginning of the enumeration process and iterate through this to scan for each type of device. With a single snapshot, we can be assured that the device instance handle will not change between passes and thus we can use this as the unique identifier. This completely removes the need to hash the device instance ID to obtain a unique identifier and simplifies the process. The previous enumeration process also created "dummy" libusb_device instances for the HCDs that were never exposed to the user. This has been removed in favor of identifying which of the encountered hubs are actually root hubs. Finally, the query for the port number has been moved to the GENeric pass at the point where the devices are actually initialized. This query operation has been relaxed to allow failure, since some virtual USB devices don't properly implement this query in their drivers. Closes #215, Closes #251, Closes #257, Closes #288 Signed-off-by: Chris Dickens <christopher.a.dickens@gmail.com>
2 lines
26 B
C
2 lines
26 B
C
#define LIBUSB_NANO 11255
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