// Make a string from a target with proper error reporting. This is a wrapper
// around str_nfc_target.
func TargetString(t Target, verbose bool) (string, error) {
ptr := unsafe.Pointer(t.Marshall())
var result *C.char = nil
length := C.str_nfc_target(&result, (*C.nfc_target)(ptr), C.bool(verbose))
defer C.nfc_free(unsafe.Pointer(result))
if length < 0 {
return "", Error(length)
}
return C.GoStringN(result, C.int(length)), nil
}
// Print information about an NFC device.
func (d Device) Information() (string, error) {
if *d.d == nil {
return "", errors.New("device closed")
}
var ptr *C.char
buflen := C.nfc_device_get_information_about(*d.d, &ptr)
if buflen < 0 {
return "", Error(buflen)
}
// documentation for nfc_device_get_information_about says that buflen
// contains the length of the string that is returned. Apparently, for
// some drivers, buflen is always 0 so we disregard it.
str := C.GoString(ptr)
C.nfc_free(unsafe.Pointer(ptr))
return str, nil
}