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

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

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
-- 
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