Re: [Libusb-win32-devel] Reg:writepipe failed with error 87

[anshu p. <pan...@gm...>]

Hi Team,
Thanks for the reply.
I have followed this link
https://docs.microsoft.com/en-us/windows-hardware/drivers/usbcon/winusb-installation
to make my device as winusb without installing a custom driver.
After doing the above step my device(scanner device) is working as a winusb
device and also i have downloaded libusbK-3.0.7.0-setup to work with this
device.

I have followed the steps below:
1-LstK_Init
2-LstK_Count
3-LstK_FindByVidPid
4-!LibK_LoadDriverAPI(Usb, deviceInfo->DriverID)
KUSB_DRVID_WINUSB:
printf("WinUSB driver api loaded!\n");
5-!Usb.Init(usbHandle, deviceInfo)
6-!Usb.QueryInterfaceSettings(usbHandle, 0x0, &interfaceInfo)
7-Usb.QueryPipe(usbHandle, (UCHAR)ALT_SETTING_NUMBER, (UCHAR)iEndpoint,
&pipeInfo);
ALT_SETTING_NUMBER =0x01(i want to work with bulk pipe)
8-Usb.WritePipe(usbHandle, 0x01, cmdBuffer, sizeof(cmdBuffer),
(PUINT)&lengthTransferred, NULL);
BYTE cmdBuffer[8+1] = {0x00,0x00,0x00, 0x01};

till the 7 steps everything is successfully done but writepipe is not
working .

Is these steps are enough to understand or i should forward all the code
which I am using currently.
Please update me about this.

Thanks,
Anshul

On Wed, Jul 22, 2020 at 7:47 PM Xiaofan Chen <xia...@gm...> wrote:

> Please provide more details, what is the device? OS version? And provide
> the minimum code snippets to cause the error.
>
> -
> Xiaofan
>
> On Wed, Jul 22, 2020, 6:15 PM anshu panwar <pan...@gm...> wrote:
>
>> Hi Team,
>> I am facing issues in writepipe/readpipe after successfully open the
>> device handle.
>> Currently 87 error is return from writepipe using libusbk lib for winusb
>> device.
>>
>> Thanks,
>> Anshul
>> _______________________________________________
>> Libusb-win32-devel mailing list
>> Lib...@li...
>> https://lists.sourceforge.net/lists/listinfo/libusb-win32-devel
>>
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