android - libusb on lollipop - fails to get devices list -

-

few days ago i've tested app on android lollipop , stops working. after debugging i've found libsub fails devices list:

struct libusb_device **devs; int devs_count = libusb_get_device_list(ctx, &devs);

i've continues dig sources , found next failure (linux_usbfs.c):

dir *buses = opendir(usbfs_path); // '/dev/bus/usb', correct struct discovered_devs *discdevs = *_discdevs; int r = 0;  if (!buses) {     usbi_err(ctx, "opendir buses failed errno=%d", errno);     return libusb_error_io; // case! }

usbfs_path correct (/dev/bus/usb) , device /dev/bus/usb/003/002.

how can work usb device using libusb in android lollipop?

previously i've iterated on devices, found device using pid , vid, requested it's endpoints , worked usual. can't struct libusb_device **devs; using libusb_get_device_list , stops everything. can having device path , opened connection file descriptor android?

ps. testing on nexus 9 android 5.1.1

pps. can't use either libusb_open_device_with_vid_pid requests devices list too: 

default_visibility libusb_device_handle * libusb_call libusb_open_device_with_vid_pid( libusb_context *ctx, uint16_t vendor_id, uint16_t product_id) {     struct libusb_device **devs;     struct libusb_device *found = null;     struct libusb_device *dev;     struct libusb_device_handle *handle = null;     size_t = 0;     int r;      if (libusb_get_device_list(ctx, &devs) < 0)         return null;


Comments

Post a Comment

Popular posts from this blog

yii2 - Yii 2 Running a Cron in the basic template -

-
i have seen instructions on running cron in advanced template, cant figure out how on basic template. have following controller in basic controllers folder. <?php namespace app\controllers; use yii\console\controller; /** * cron controller */ class croncontroller extends controller { public function actionindex() { echo "cron service runnning"; } public function actionmail($to) { echo "sending mail " . $to; } } i have navigated root of application , tried these comands yii cron php yii cron im getting unknown comand "cron" i know old question failed find actual answer this. if @ code yii exec file you'll notice requires /common/config/aliases.php file console/config/main.php. can naturally change these or copy on these advanced template. hope solves problem wanting same thing.
Read more

asp.net - 'System.Web.HttpContext' does not contain a definition for 'GetOwinContext' Mystery -

-
i realize question might seem trivial some, it's these types of things find myself fighting quite bit , want make sense of despite seeming losing battle in .net (for me anyway). so, if following: using system.web; ... applicationuser user = system.web.httpcontext.getowincontext().getusermanager<applicationusermanager>().findbyid(system.web.httpcontext.user.identity.getuserid()); that produces error in title , red getowincontext() , error cannot resolve symbol 'getowincontext()' however, if following (remove system.web in front of httpcontext ), works expected (or @ least no errors): using system.web; ... applicationuser user = httpcontext.getowincontext().getusermanager<applicationusermanager>().findbyid(system.web.httpcontext.user.identity.getuserid()); however, if (same line that's working using system.web commented out): //using system.web; ... applicationuser user = httpcontext.getowincontext().getusermana...
Read more

mercurial graft feature, can it copy? -

-
there new feature in mercurial 3, called 'graft' (graft local). job of moving change-set different branch. is there way "copy" change-set branch? i interested in in moving stuff qa branch production branch, still need code reside in qa. want copy. found , have tried few things, maybe it'll become clear more tinkering , reading... does have better way of 'cherry picking' change-sets move cross branch (or trunk)??? graft copies changesets, doesn't move them. hg graft (emphasis mine): this command uses mercurial's merge logic copy individual changes other branches without merging branches in history graph. known 'backporting' or 'cherry-picking' . default, graft copy user, date, , description source changesets.
Read more