我有错误：
"File "/home/pi/blescan.py", line 78, in hci_le_set_scan_parameters
old_filter = sock.getsockopt( bluez.SOL_HCI, bluez.HCI_FILTER, 14)
error: (9, 'Bad file descriptor')"
我不确定错误的原因是什么，我已经尝试了在线提供的任何解决方案，但它导致了同样的错误。
DEBUG = False
import os
import sys
import struct
import bluetooth._bluetooth as bluez
from time import gmtime, strftime
LE_META_EVENT = 0x3e
LE_PUBLIC_ADDRESS=0x00
LE_RANDOM_ADDRESS=0x01
LE_SET_SCAN_PARAMETERS_CP_SIZE=7
OGF_LE_CTL=0x08
OCF_LE_SET_SCAN_PARAMETERS=0x000B
OCF_LE_SET_SCAN_ENABLE=0x000C
OCF_LE_CREATE_CONN=0x000D
LE_ROLE_MASTER = 0x00
LE_ROLE_SLAVE = 0x01
# these are actually subevents of LE_META_EVENT
EVT_LE_CONN_COMPLETE=0x01
EVT_LE_ADVERTISING_REPORT=0x02
EVT_LE_CONN_UPDATE_COMPLETE=0x03
EVT_LE_READ_REMOTE_USED_FEATURES_COMPLETE=0x04
# Advertisment event types
ADV_IND=0x00
ADV_DIRECT_IND=0x01
ADV_SCAN_IND=0x02
ADV_NONCONN_IND=0x03
ADV_SCAN_RSP=0x04
def returnnumberpacket(pkt):
myInteger = 0
multiple = 256
for c in pkt:
myInteger += struct.unpack("B",c)[0] * multiple
multiple = 1
return myInteger
def returnstringpacket(pkt):
myString = "";
for c in pkt:
myString += "%02x" %struct.unpack("B",c)[0]
return myString
def printpacket(pkt):
for c in pkt:
sys.stdout.write("%02x " % struct.unpack("B",c)[0])
def get_packed_bdaddr(bdaddr_string):
packable_addr = []
addr = bdaddr_string.split(':')
addr.reverse()
for b in addr:
packable_addr.append(int(b, 16))
return struct.pack("<BBBBBB", *packable_addr)
def packed_bdaddr_to_string(bdaddr_packed):
return ':'.join('%02x'%i for i in struct.unpack("<BBBBBB",bdaddr_packed[::-1]))
def hci_enable_le_scan(sock):
hci_toggle_le_scan(sock, 0x01)
def hci_disable_le_scan(sock):
hci_toggle_le_scan(sock, 0x00)
def hci_toggle_le_scan(sock, enable):
cmd_pkt = struct.pack("<BB", enable, 0x00)
bluez.hci_send_cmd(sock, OGF_LE_CTL, OCF_LE_SET_SCAN_ENABLE, cmd_pkt)
def hci_le_set_scan_parameters(sock):
old_filter = sock.getsockopt( bluez.SOL_HCI, bluez.HCI_FILTER, 14)
SCAN_RANDOM = 0x01
OWN_TYPE = SCAN_RANDOM
SCAN_TYPE = 0x01
def parse_events(sock, loop_count=100):
old_filter = sock.getsockopt( bluez.SOL_HCI, bluez.HCI_FILTER, 14)
CurrentTime = strftime("%H:%M,%S", gmtime())
flt = bluez.hci_filter_new()
bluez.hci_filter_all_events(flt)
bluez.hci_filter_set_ptype(flt, bluez.HCI_EVENT_PKT)
sock.setsockopt( bluez.SOL_HCI, bluez.HCI_FILTER, flt )
done = False
results = []
myFullList = []
for i in range(0, loop_count):
pkt = sock.recv(255)
ptype, event, plen = struct.unpack("BBB", pkt[:3])
#print "--------------"
if event == bluez.EVT_INQUIRY_RESULT_WITH_RSSI:
i =0
elif event == bluez.EVT_NUM_COMP_PKTS:
i =0
elif event == bluez.EVT_DISCONN_COMPLETE:
i =0
elif event == LE_META_EVENT:
subevent, = struct.unpack("B", pkt[3])
pkt = pkt[4:]
if subevent == EVT_LE_CONN_COMPLETE:
le_handle_connection_complete(pkt)
elif subevent == EVT_LE_ADVERTISING_REPORT:
#print "advertising report"
num_reports = struct.unpack("B", pkt[0])[0]
report_pkt_offset = 0
for i in range(0, num_reports):
if (DEBUS == True):
print "-------------"
print "\tMAC address: ", packed_bdaddr_to_string(pkt[report_pkt_offset + 3:report_pkt_offset + 9])
TxPower, = struct.unpack("b", pkt[report_pkt_offset -2])
print "\tTxpower:", -TxPower
rssi, = struct.unpack("b", pkt[report_pkt_offset -1])
print "\tRSSI:", rssi
print "\tTime:", CurrentTime
# build the return string
Adstring = packed_bdaddr_to_string(pkt[report_pkt_offset + 3:report_pkt_offset + 9])
Adstring += ","
Adstring += returnstringpacket(pkt[report_pkt_offset -22: report_pkt_offset - 6])
Adstring += ","
Adstring += "%i" % returnnumberpacket(pkt[report_pkt_offset -6: report_pkt_offset - 4])
Adstring += ","
Adstring += "%i" % returnnumberpacket(pkt[report_pkt_offset -4: report_pkt_offset - 2])
Adstring += ","
Adstring += "%i" % struct.unpack("b", pkt[report_pkt_offset -2])
Adstring += ","
Adstring += "%i" % struct.unpack("b", pkt[report_pkt_offset -1])
#print "\tAdstring=", Adstring
myFullList.append(Adstring)
done = True
sock.setsockopt( bluez.SOL_HCI, bluez.HCI_FILTER, old_filter )
return myFullList
完整追踪错误：
Traceback (most recent call last):
File "/home/pi/blescan.py", line 79, in hci_le_set_scan_parameters
old_filter = socket.getsockopt( bluez.SOL_HCI, bluez.HCI_FILTER, 14)
error: (9, 'Bad file descriptor')
Traceback (most recent call last):
File "/home/pi/testblescan.py", line 15, in <module>
blescan.hci_enable_le_scan(socket)
File "/home/pi/blescan.py", line 67, in hci_enable_le_scan
hci_toggle_le_scan(socket, 0x01)
File "/home/pi/blescan.py", line 74, in hci_toggle_le_scan
bluez.hci_send_cmd(socket, OGF_LE_CTL, OCF_LE_SET_SCAN_ENABLE, cmd_pkt)
error: (9, 'Bad file descriptor')
答案 0 :(得分：0)
输出似乎报告了OSError，并伴有错误代码。这不是特定于Python的问题，因为它是由底层操作系统引发的。
您可以使用standard library's errno feature获取有关操作系统错误代码的信息。
您还可以通过the os.strerror function询问错误代码的说明：
import os
os.strerror(9) # Returns the text value “Bad file descriptor”.
因此，您的程序正在做的事情是使用文件描述符（表示正在运行的程序中的输入/输出流的整数），它实际上没有附加文件。操作系统抱怨，并且Python将其报告为OSError。
您可以查询the OSError object you catch的错误代码（errno属性）以及报告的文件名（filename属性）：
try:
do_the_thing()
except OSError as exc:
logger_for_this_program(
"Got OSError (code {exc.errno:d}, filename {exc.filename})".format(
exc=exc))