Re: [Libusb-win32-devel] application works with older libusb-win32 but not with version 0.1.12.1

[Ampfing <Mic...@gm...>]

Hi,

the error message is
"usb_set_configuration: could not set config 1: win error: The parameter is
incorrect.".

Michael


Stephan Meyer-2 wrote:
> 
> What's the error message returned
> by usb_strerror()?
> 
> Stephan
> 
> 
>> 
>> Hi,
>> 
>> I have a VisualC++ 6.0-application (MFC) for Windows XP.
>> This application is supposed to communicate with a microcontroller using
>> Bulk writes over USB.
>> With an older version of libusb (can't tell you the version, but it's 
> from
>> 05 August 2006) the application works fine. Now I downloaded the newest
>> version of libusb (not the filter-driver!) and created a new inf-file.
>> After installing the new driver the application does not work any more!
>> The relevant code is:
>> ---------------------------------------------------
>> usb_init();
>> usb_find_busses();
>> usb_find_devices();
>> for (m_bus = usb_get_busses(); m_bus; m_bus = m_bus->next)
>> {
>>    struct usb_device *dev;
>>    for (dev = m_bus->devices; dev; dev = dev->next)
>>    {
>>       if (dev->descriptor.bDeviceClass == 0xff)   //find for vendor 
>> specific class
>>       {
>>          m_dev = usb_open(dev);
>>          if (m_dev)
>>          {
>>             if ((dev->descriptor.idVendor == USB_VENDOR) && 
>>             (dev->descriptor.idProduct == USB_PRODUCT))
>>             {
>>                int err;
>>                err = usb_set_configuration(m_dev, 1);
>>                if (err)
>>                {
>>                   char* s= usb_strerror();
>>                   m_strInitStatus = s;
>>                   UpdateData(FALSE);
>>                   return;
>>                }
>>                err = usb_claim_interface(m_dev, 0);
>>                if (err)
>>                {
>>                   char* s= usb_strerror();
>>                   m_strInitStatus = s;
>>                   UpdateData(FALSE);
>>                   return;
>>                }
>>             }
>>          }
>>       }
>>    }
>> }
>> 
> ------------------------------------------------------------------------------------
>> 
>> With the new version of libusb the usb_set_configuration(...) call 
> returns
>> with an error and tells me, that configuration 1 could not be set 
> because
>> the parameter is invalid...
>> If I use the new libusb0.dll, the new libusb.lib and the OLD libusb0.sys 
> the
>> application works fine again.
>> 
>> Can someone please tell me where I am going wrong?
>> Thank you in advantage for your help
>> -- 
>> View this message in context: http://www.nabble.com/application-
>> works-with-older-libusb-win32-but-not-with-version-0.1.12.1-
>> tf4770195.html#a13644735
>> Sent from the LibUSB Dev - Win32 mailing list archive at Nabble.com.
>> 
>> 
>> 
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> 
> 
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> 

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Sent from the LibUSB Dev - Win32 mailing list archive at Nabble.com.