Question about the libusb package

Dear :
         I am a user of libusb-win32-bin-1.2.6.0 package, it is a good
solution about the USB device, but I got some trouble in it.
My computer OS is wondows7 x86,and I used the package on Visual Studio 2010.
I used the package to get iManufacturer number of USB camera module. I can
get the number after install the inf-wizard.exe(I cannot get anything from
the USB, if without installing the inf-wizard.exe).
When I install the inf-wizard.exe, the USB camera module become a disk on
my computer, I cannot use the USB camera module as a camera, how can I do?

my c code show as follow:


#include "stdafx.h"
#include "lusb0_usb.h"
#include <string.h>
#include <stdio.h>
#include <Windows.h>


int main( )
{
struct usb_bus *bus;
struct usb_device *dev;

usb_init();
usb_find_busses();
usb_find_devices();

for (bus = usb_busses; bus; bus = bus->next)
{
for (dev = bus->devices; dev; dev = dev->next)
{
int ret;
char string[256];
usb_dev_handle *udev;
udev = usb_open(dev);

if (udev==NULL)
{
printf("can find device");
system("pause");
return -1;
}
if (udev)
{
if (dev->descriptor.iManufacturer)
{
ret = usb_get_string_simple(udev, dev->descriptor.iManufacturer, string,
sizeof(string));
if (ret > 0)
printf("Manufacturer : %s\n", string);
}

if (dev->descriptor.iProduct)
{
ret = usb_get_string_simple(udev, dev->descriptor.iProduct, string,
sizeof(string));
if (ret > 0)
printf("Product : %s\n", string);
system("pause");
}
 usb_close (udev);
}
}
}
system("pause");
return 0;

}

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