2014-07-29 23:28 GMT+02:00 Bob Tausworthe <t...@sentons.com>: > Sorry to trouble you but I've exhausted other options. We are developing a > composite HID/debug interace device and are using libusb 1.0 under 32 bit > Cygwin to access the debug interface portion. Everything is working fine on > Windows 7 and Linux but when we try to run the application on Windows 8, it > fails with the error : > > libusb: debug [unsupported_open] unsupported API call for 'open' > (unrecognized device driver) > libusb: debug [libusb_open] open 2.16 returns -12 > ERROR: Unable to open usb device > > After reading some posts of people with similar issues, I tried all of the > drivers Zadig supports but didn't see any difference in behavior. I have > tried building under Win7 and Win8 but the results are the same. I am using > version 1.0.18 of libusb. The trace below was taken with the WinUSB driver > version 6.1.7600.16385. > > Any help you can give me to point me in the right direction would be > welcome. Here is the code I'm using to open our device and the trace > listing. > > Thanks > > Bob Tausworthe > t...@sentons.com > Sentons, inc. > > int > > InitUSB(void) > > { > > // Change these as needed to match idVendor and idProduct in your > device's device descriptor. > > int device_ready = 0; > > int result; > > libusb_device **list; > > libusb_device *found = NULL; > > libusb_context *ctx = NULL; > > int attached = 0; > > result = libusb_init(&ctx); > > if (result == 0) { > > if (usb_trace_enabled) > > libusb_set_debug(ctx,255); // LIBUSB_LOG_LEVEL_DEBUG, > LIBUSB_LOG_LEVEL_WARNING > > ssize_t i = 0; > > int err = 0; > > ssize_t cnt = libusb_get_device_list(ctx, &list); > > if (cnt < 0){ > > fprintf(stderr, "ERROR: no usb devices found\n" ); > > error(); > > } > > // find our device. Note we are using the brute force method rather > > // than open_device_with_vid_pid() because we need the device pointer > > // to look at the config descriptor. > > for(i = 0; i < cnt; i++){ > > libusb_device *device = list[i]; > > if( is_correctdev(device) ){
How does the is_correctdev() function decide which device to pick? -- Matthias Bolte http://photron.blogspot.com ------------------------------------------------------------------------------ Infragistics Professional Build stunning WinForms apps today! Reboot your WinForms applications with our WinForms controls. Build a bridge from your legacy apps to the future. http://pubads.g.doubleclick.net/gampad/clk?id=153845071&iu=/4140/ostg.clktrk _______________________________________________ libusbx-devel mailing list libusbx-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/libusbx-devel