##language:zh
#pragma section-numbers off
##含有章节索引导航的 ZPyUG 文章通用模板
<<TableOfContents>>
## 默许导航,请保留
<<Include(ZPyUGnav)>>


= 解密 dianping.com 的坐标 =
http://blog.wensheng.com/2008/04/decoding-dianpingcom-google-map-latlng.html
{{{
Wensheng <wenshengwang@gmail.com>
reply-to	python-cn@googlegroups.com
to	python-cn`CPyUG`华蟒用户组 <python-cn@googlegroups.com>
date	Sat, May 24, 2008 at 6:00 AM
subject	[CPyUG:52307] 解密点评地图坐标
}}}
点评用谷歌地图，但是给地图坐标加了密。我不知道这样做是为了什么。因为你必须在浏览器里解密，所以研究下代码，很容易就解了密。这里给出解密代码，是用python写的。

##startInc

{{{#!python
#digi=16
#add=10
#plus=7
#cha=36 #

def tostr36(i):
    s = ""
    d = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
    while 1:
        r = i % 36
        s = d[r] + s
        i = i/36
        if i==0:break
    return s

def decode(s):
    c = -1
    d = 0
    e = ''
    g = ord(s[-1])

    for i in range(len(s)):
        h=int(s[i],36)-10 #add
        if h>=10: h=h-7 #plus
        e += tostr36(h)
        if h>d:
            c=i
            d=h

    j = int(e[0:c],16)
    k = int(e[c+1:],16)

    l = (j + k - g) / 2
    m = (k - l) / 100000.0
    l /= 100000.0
    if l>180:l -= 360
    return l,m

if __name__ == "__main__":
    import sys
    #print decode("HERUCVZVVIGID")
    print decode(sys.argv[1][:-1])
}}}    

##endInc

----
'''反馈'''

创建 by -- ZoomQuiet [<<DateTime(2008-05-23T23:43:02Z)>>]