Question

更新：我使用os.system解决了我的解决方案：

sensortag=0
while sensortag != "B4:99:4C:64:33:E0":
    #call the command and write to scan.txt file and then fill the process.
    #loop to find if the MAC address given is available
    os.system("hcitool lescan> scan.txt & pkill --signal SIGINT hcitool")
    scan = open("scan.txt","r")
    readscan = scan.read()
    if "B4:99:4C:64:33:E0" in readscan:
        print "SensorTag found."
        sensortag = "B4:99:4C:64:33:E0"

我有两个程序，基本上是相同的，但有两个不同的命令，在Raspberry PI上，运行Raspbian。

我要做的是将两个命令输出写入文件，以便稍后处理它们。

我很困惑为什么第一个程序不会起作用，但第二个程序会起作用。

第一个程序有一个＆＃34; sudo timeout 5 hcitool lescan ＆＃34;命令，不起作用。

import os
import subprocess

#r+ because the file is already there, w without the file
myfile = open("scan.txt", "r+")

#Reset Bluetooth interface, hci0
os.system("sudo hciconfig hci0 down")
os.system("sudo hciconfig hci0 up")

#Scan for bluetooth devices
dev = subprocess.Popen(["sudo timeout 5 hcitool lescan"], stdout=subprocess.PIPE, shell=True)
(device, err) = dev.communicate()

#Print bluetooth devices
print device

#Write the hcitool lescan output to a file
myfile.write(device)

#Close the file
myfile.close()

以下是第二个计划正常工作精细打印＆＃34; sudo hciconfig ＆＃34;：

import os
import subprocess

#r+ because the file is already there, w without the file
myfile = open("test.txt", "r+")

#Reset Bluetooth interface, hci0
os.system("sudo hciconfig hci0 down")
os.system("sudo hciconfig hci0 up")

#Make sure device is up
interface = subprocess.Popen(["sudo hciconfig"], stdout=subprocess.PIPE, shell=True)
(int, err) = interface.communicate()

#Print hciconfig to make sure it's up
print int

#Write the hciconfig output to a file
myfile.write(int)

#Close the file
myfile.close()

Answer 1

我使用os.system解决了我的解决方案并立即终止扫描：

sensortag=0
while sensortag != "B4:99:4C:64:33:E0":
    #call the command and write to scan.txt file and then fill the process.
    #loop to find if the MAC address given is available
    os.system("hcitool lescan> scan.txt & pkill --signal SIGINT hcitool")
    scan = open("scan.txt","r")
    readscan = scan.read()
    if "B4:99:4C:64:33:E0" in readscan:
        print "SensorTag found."
        sensortag = "B4:99:4C:64:33:E0"

Answer 2

经过几个小时的努力，我想出了这个解决方案。 hcitool lescan的问题是它在收到SIGINT之前不会返回，所以我们用Python发送它：

    bashCommand = "hcitool lescan"
    process = subprocess.Popen(bashCommand.split(), stdout=subprocess.PIPE)
    time.sleep(3)
    os.kill(process.pid, signal.SIGINT)
    output = process.communicate()[0]

这对我来说，经过3秒的搜索，返回了一个包含找到的所有mac地址的字符串。

Answer 3

仅使用终端，以下命令可以正常工作：

hcitool lescan > scan.txt & sleep 2 && pkill --signal SIGINT hcito

我会把它留在这里，也许这会对某人有帮助。

Hcitool lescan不会实时打印到文件

3 个答案: