Hi,
On Tue, Jan 1, 2013 at 7:57 AM, Xiaofan Chen <xiaof...@gmail.com> wrote:
> On Tue, Jan 1, 2013 at 2:43 AM, Mohamed HAMZAOUI <requin...@gmail.com> wrote:
>> Hi,
>> Happy new year for everyone :)
>>
>> I have a strange problem with libusbx 1.0.14 on windows 7
>>
>> when i run this test :
>>
>> status = libusb_init(&ctx);
>>
>> libusb_get_device_list(ctx,&list_devices);
>>
>> libusb_open(libusb_dev[dev_index], &handle);
>>
>> libusb_close(handle);
>
> Why you close the handle and then open?
> This should not be here.
>
I have just describe for you the summary of the sequence of actions in
a large program ...
There are various purposes for which you can open and close a dev and
then open it another time... (managing licenses saved on the card in
my case...), but in general there is no restriction on the
documentation !
>> libusb_open(libusb_dev[dev_index], &handle);
>>
>> Here the libusb_open return -3 and debug messages is :
>> libusbx: error [winusbx_open] could not open device
>> \\.\USB#VID_0525&PID_A4A0#1_00000000#{A5DCBF10-6530-11D2-901F-00C04FB951ED}
>> (interface 0): [5] Access Denied
>
> Another thing, did you install a supported driver (like WinUSB)?
> https://github.com/libusbx/libusbx/wiki/Windows-Backend#wiki-How_to_use_libusbx_on_Windows
>
Sure I have the correct driver installed via zadig and I use it
normally (this is with him that I perform the first open and several
IO with my device)
Regards,
Mohamed
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