基于lrdcp大神的py的源码，用mfc写的gui程序，免py环境安装，方便使用。
wxapkg的存储位置：/data/data/com.tencent.mm/MicroMsg/{User}/appbrand/pkg
{User} 为用户的用户名，pkg目录就是微信用于存放小程序和小游戏下载包的位置。
Python代码：
#!/usr/bin/env python2
# lrdcq
# usage python2 unwxapkg.py filename
import sys, os
import struct
class WxapkgFile(object):
nameLen = 0
name = ""
offset = 0
size = 0
if len(sys.argv) < 2:
print 'usage: unwxapkg.py filename'
exit()
with open(sys.argv[1], "rb") as f:
root = os.path.dirname(os.path.realpath(f.name))
name = os.path.basename(f.name) + '_dir'
if len(sys.argv) > 2:
name = sys.argv[2]
#read header
firstMark = struct.unpack('B', f.read(1))[0]
print 'first header mark = ' + str(firstMark)
info1 = struct.unpack('>L', f.read(4))[0]
print 'info1 = ' + str(info1)
indexInfoLength = struct.unpack('>L', f.read(4))[0]
print 'indexInfoLength = ' + str(indexInfoLength)
bodyInfoLength = struct.unpack('>L', f.read(4))[0]
print 'bodyInfoLength = ' + str(bodyInfoLength)
lastMark = struct.unpack('B', f.read(1))[0]
print 'last header mark = ' + str(lastMark)
if firstMark != 0xBE or lastMark != 0xED:
print 'its not a wxapkg file!!!!!'
exit()
fileCount = struct.unpack('>L', f.read(4))[0]
print 'fileCount = ' + str(fileCount)
#read index
fileList = []
for i in range(fileCount):
data = WxapkgFile()
data.nameLen = struct.unpack('>L', f.read(4))[0]
data.name = f.read(data.nameLen)
data.offset = struct.unpack('>L', f.read(4))[0]
data.size = struct.unpack('>L', f.read(4))[0]
print 'readFile = ' + data.name + ' at Offset = ' + str(data.offset)
fileList.append(data)
#save files
for d in fileList:
d.name = '/' + name + d.name
path = root + os.path.dirname(d.name)
if not os.path.exists(path):
os.makedirs(path)
w = open(root + d.name, 'w')
f.seek(d.offset)
w.write(f.read(d.size))
w.close()
print 'writeFile = ' + root + d.name
f.close()
