從實用性來講，要是非得連上『無線阡陌網』，否則不能使用那個『定向器』，除非為了安全顧慮，大概並不方便。那麼將如何用 Python WiFi 來取得 AP 『熱點資訊』 的呢？由於作者不知道哪裡有文件可讀？所以只是依著玩遊戲『過關』之精神，到處看看，隨便試試，這或許就是『互動式』程式的好處吧！略將結果整理如下︰
pi@raspberrypi ~*** QuickLaTeX cannot compile formula: sudo python Python 2.7.3 (default, Mar 18 2014, 05:13:23) [GCC 4.6.3] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> from pythonwifi.iwlibs import Wireless # 選取 WiFi 裝置 >>> wifi = Wireless('wlan0') # AP 熱點掃描 >>> iwScan = wifi.scan() # 探詢掃描物件屬性 >>> dir(iwScan) ['__class__', '__delattr__', '__dict__', '__doc__', '__format__', '__getattribute__', '__hash__', '__init__', '__iter__', '__len__', '__module__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', '_parse', 'aplist', 'getScan', 'ifname', 'index', 'next', 'range', 'stream'] # AP 表列物件 >>> apList = iwScan.aplist # AP 表列物件屬性 >>> dir(apList[1]) ['__class__', '__delattr__', '__dict__', '__doc__', '__format__', '__getattribute__', '__hash__', '__init__', '__module__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', 'addEvent', 'bssid', 'custom', 'display', 'encode', 'essid', 'frequency', 'mode', 'protocol', 'quality', 'range', 'rate'] # 探詢某一 AP 物件 >>> apList[1].essid 'iHOME' >>> apList[1].bssid '78:54:2E:FB:77:B0' >>> apList[1].encode <pythonwifi.iwlibs.Iwpoint object at 0x767d3630> >>> apList[1].frequency <pythonwifi.iwlibs.Iwfreq object at 0x767d3610> >>> apList[1].mode 'Master' # 探詢何謂 AP 品質？ >>> apList[1].quality <pythonwifi.iwlibs.Iwquality object at 0x767d3570> # 探詢 AP 品質物件屬性 >>> dir(apList[1].quality) ['__class__', '__delattr__', '__dict__', '__doc__', '__format__', '__getattribute__', '__hash__', '__init__', '__module__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', 'fmt', 'getNoiselevel', 'getSignallevel', 'nlevel', 'noiselevel', 'parse', 'quality', 'setNoiselevel', 'setSignallevel', 'setValues', 'siglevel', 'signallevel', 'updated'] # 訊號強度？！ >>> apList[1].quality.getSignallevel() 49 >>> </pre> <span style="color: #808000;">也許有人會先讀『 iwlist.py 』範例原始碼，畢竟『 iwlist 』指令能夠作 AP 掃描的啊！！</span> <pre class="lang:python decode:true "># iwlist.py 原始碼 scanning 部份 def print_scanning_results(wifi, args=None): """ Print the access points detected nearby. """ # "Check if the interface could support scanning" try: iwrange = Iwrange(wifi.ifname) except IOError, (error_number, error_string): sys.stderr.write("%-8.16s Interface doesn't support scanning.\n\n" % ( wifi.ifname)) else: # "Check for Active Scan (scan with specific essid)" # "Check for last scan result (do not trigger scan)" # "Initiate Scanning" try: results = wifi.scan() except IOError, (error_number, error_string): if error_number != errno.EPERM: sys.stderr.write( "%-8.16s Interface doesn't support scanning : %s\n\n" % (wifi.ifname, error_string)) else: if (len(results) == 0): print "%-8.16s No scan results" % (wifi.ifname, ) else: (num_channels, frequencies) = wifi.getChannelInfo() print "%-8.16s Scan completed :" % (wifi.ifname, ) index = 1 for ap in results: print " Cell %02d - Address: %s" % (index, ap.bssid) print " ESSID:\"%s\"" % (ap.essid, ) print " Mode:%s" % (ap.mode, ) print " Frequency:%s (Channel %d)" % \ (wifi._formatFrequency(ap.frequency.getFrequency()), frequencies.index(wifi._formatFrequency( ap.frequency.getFrequency())) + 1) if (ap.quality.updated & \ pythonwifi.flags.IW_QUAL_QUAL_UPDATED): quality_updated = "=" else: quality_updated = ":" if (ap.quality.updated & \ pythonwifi.flags.IW_QUAL_LEVEL_UPDATED): signal_updated = "=" else: signal_updated = ":" if (ap.quality.updated & \ pythonwifi.flags.IW_QUAL_NOISE_UPDATED): noise_updated = "=" else: noise_updated = ":" print " " + \ "Quality%c%s/%s Signal level%c%s/%s Noise level%c%s/%s" % \ (quality_updated, ap.quality.quality, wifi.getQualityMax().quality, signal_updated, ap.quality.getSignallevel(), "100", noise_updated, ap.quality.getNoiselevel(), "100") # This code on encryption keys is very fragile if (ap.encode.flags & pythonwifi.flags.IW_ENCODE_DISABLED): key_status = "off" else: if (ap.encode.flags & pythonwifi.flags.IW_ENCODE_NOKEY): if (ap.encode.length <= 0): key_status = "on" print " Encryption key:%s" % (key_status, ) if len(ap.rate) > 0: for rate_list in ap.rate: # calc how many full lines of bitrates rate_lines = len(rate_list) / 5 # calc how many bitrates on last line rate_remainder = len(rate_list) % 5 line = 0 # first line should start with a label rate_line = " Bit Rates:" while line < rate_lines: # print full lines if line > 0: # non-first lines should start *very* indented rate_line = " " rate_line = rate_line + "%s; %s; %s; %s; %s" % \ tuple(wifi._formatBitrate(x) for x in rate_list[line * 5:(line * 5) + 5]) line = line + 1 print rate_line if line > 0: # non-first lines should start *very* indented rate_line = " " # print non-full line print rate_line + "%s; "*(rate_remainder - 1) % \ tuple(wifi._formatBitrate(x) for x in rate_list[line * 5:line * 5 + rate_remainder - 1]) + \ "%s" % (wifi._formatBitrate( rate_list[line * 5 + rate_remainder - 1])) index = index + 1 print </pre> <span style="color: #808000;">若說條條大路通羅馬。事物總有交會處，事理經常能互補。何不就盡興的『玩』科技呢？？方法之事或許多多益善！終會有應用之時的耶！！</span> <span style="color: #ff9900;">※ 補記︰請特別注意上面那個『 sudo 』。想多了解『 iwlib 』資料結構者，或將需要『 iwlib.h 』檔案，請用</span> <span style="color: #808080;">sudo apt-get install libiw-dev</span> <span style="color: #ff9900;">取得。</span> <span style="color: #808080;"><strong>【參考資料】</strong></span> <pre class="lang:sh decode:true ">pi@raspberrypi ~ *** Error message: Missing $ inserted. You can't use `macro parameter character #' in vertical mode. leading text: # Unicode character 選 (U+9078) leading text: # 選 Unicode character 取 (U+53D6) leading text: # 選取 Unicode character 裝 (U+88DD) leading text: # 選取 WiFi 裝 Unicode character 置 (U+7F6E) leading text: # 選取 WiFi 裝置 You can't use `macro parameter character #' in vertical mode. leading text: # Unicode character 熱 (U+71B1) leading text: # AP 熱 Unicode character 點 (U+9EDE) leading text: # AP 熱點 Unicode character 掃 (U+6383) leading text: # AP 熱點掃 Unicode character 描 (U+63CF) leading text: # AP 熱點掃描 You can't use `macro parameter character #' in vertical mode. leading text: # Unicode character 探 (U+63A2)more /usr/include/iwlib.h
/*
* Wireless Tools
*
* Jean II - HPLB 97->99 - HPL 99->09
*
* Common header for the Wireless Extension library...
*
* This file is released under the GPL license.
* Copyright (c) 1997-2009 Jean Tourrilhes <jt@hpl.hp.com>
*/#ifndef IWLIB_H
#define IWLIB_H/***************************** INCLUDES *****************************/
/* Standard headers */
#include <sys/types.h>
#include <sys/ioctl.h>
#include <stdio.h>
#include <math.h>
#include <errno.h>
#include <fcntl.h>
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