How can I find Device File Name of an USB?

Hi everybody, I have to find the device file name of USB devices attached, I try different things that i find on the web but I'm not able to obtain it.

Here is my code:

int main (void){

    io_iterator_t mediaIterator; /


    kern_return_t kernResult;
    mach_port_t masterPort;
    CFMutableDictionaryRef classesToMatch;

    kernResult = IOMasterPort (MACH_PORT_NULL , &masterPort);


    if ( kernResult != KERN_SUCCESS ){
        printf( "IOMasterPort returned %d\n", kernResult );
        return kernResult;
    }

    /
    classesToMatch = IOServiceMatching( kIOUSBDeviceClassName );
    if ( !classesToMatch ){
        /
        printf("could not create dictionary\n");
        return -1;
    }
    io_service_t usbDevice;   
    kernResult = IOServiceGetMatchingServices(masterPort,classesToMatch,&mediaIterator); /
    while ( (usbDevice = IOIteratorNext( mediaIterator )) ){
      
        /
        /
        /
        /
        /
        if ( !IOObjectConformsTo( usbDevice, "IOUSBDevice" )) continue;
      
        io_name_t deviceName;
        IORegistryEntryGetName( usbDevice, deviceName ); /
        printf("Device name is :  %s\n",(char *)deviceName);
      
        CFTypeRef   deviceFilePathAsCFString;
        CFIndex maxPathSize = 255;
        char deviceFilePath[256];
      
        * deviceFilePath = '\0';
      
      
        /
         kernResult =  IORegistryEntryGetPath(usbDevice,kIOUSBPlane,deviceFilePath);
         printf("\nprova 1 -> name %s\n",deviceFilePath);
      
      
      
        /
        deviceFilePathAsCFString = ( CFStringRef ) IORegistryEntryCreateCFProperty( usbDevice, CFSTR( kIOBSDNameKey ),kCFAllocatorDefault, 0 );
        printf("prova3 -> path : %s\n",(char *)deviceFilePathAsCFString);
        /
        deviceFilePathAsCFString = ( CFStringRef ) IORegistryEntrySearchCFProperty (usbDevice,kIOServicePlane,CFSTR (kIOBSDNameKey ),kCFAllocatorDefault,kIORegistryIterateRecursively );
      
      
        printf("prova2 -> path : %s\n",(char *)deviceFilePathAsCFString);

//other code here

I don't know if i forgot something or wathever, any help will be really appreciated.