Delete Cache and Cookies in Ruby

How do you clear out your browser cache and cookies from your Watir scripts? Create a ruby file del_cache.rb with the code below, then from your main testfile.rb require the file and call the function.

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#!/bin/ruby
#
#
#
#
#
# set TEMPIF=%USERPROFILE%\Local Settings\Temporary Internet Files
# %TEMPIF%\Content.IE5\Index.DAT

require ‘Win32API’

#
#
# HashMethods = a Hash that can be accessed with methods
#   e.g.    h = MethodHash.new
#           h['street'] = ‘Broadway’
#           h.street    = ‘Broadway’
#           puts h.street  ===> Broadway

require ‘delegate’

class MethodHash < SimpleDelegator
def initialize h = {}
super h
end

def method_missing(method_name, *args)
name = method_name.to_s
if name.ends_with?(’=')
self[ name.chop ] = args[0]
else
self[ name ]
end
end
end

class String
def ends_with?(substr)
len = substr.length
self.reverse() [0 .. len-1].reverse == substr
end

def starts_with?(substr)
len = substr.length
self[0 .. len-1] == substr
end

alias start_with?  starts_with?
alias begin_with?  starts_with?
alias begins_with? starts_with?
alias end_with?    ends_with?

# String each() operator reads line-by-line
# These functions return characters
def each_char
self.each_byte{|x| yield x.chr }
end
def collect_char
r = []
self.each_byte{|x| r << x.chr }
r
end
end

=begin

// Windows System calls needed to clear cache.
//

BOOL DeleteUrlCacheEntry(
LPCTSTR lpszUrlName
);

HANDLE FindFirstUrlCacheEntry(
LPCTSTR lpszUrlSearchPattern,
LPINTERNET_CACHE_ENTRY_INFO lpFirstCacheEntryInfo,
LPDWORD lpdwFirstCacheEntryInfoBufferSize
);

BOOL FindNextUrlCacheEntry(
HANDLE hEnumHandle,
LPINTERNET_CACHE_ENTRY_INFO lpNextCacheEntryInfo,
LPWORD lpdwNextCacheEntryInfoBufferSize
);

BOOL FindCloseUrlCache(
IN HANDLE hEnumHandle
);

typedef struct _INTERNET_CACHE_ENTRY_INFO {
DWORD dwStructSize;
LPTSTR lpszSourceUrlName;
LPTSTR lpszLocalFileName;
DWORD CacheEntryType;
DWORD dwUseCount;
DWORD dwHitRate;
DWORD dwSizeLow;
DWORD dwSizeHigh;
FILETIME LastModifiedTime;
FILETIME ExpireTime;
FILETIME LastAccessTime;
FILETIME LastSyncTime;
LPBYTE lpHeaderInfo;
DWORD dwHeaderInfoSize;
LPTSTR lpszFileExtension;
union {
DWORD dwReserved;
DWORD dwExemptDelta;
}
} INTERNET_CACHE_ENTRY_INFO, *LPINTERNET_CACHE_ENTRY_INFO;

=end

def main
w = get_api(’wininet’,FUNCS)
i = 0

info,infosize = get_first_info(w)
cache = w.FindFirstUrlCacheEntry.Call(nil,info,infosize)
if cache != 0
begin
len, source_file_ptr, local_file_ptr = info.unpack ‘LLL’
w.DeleteUrlCacheEntry.Call(source_file_ptr)
i += 1
info,infosize = get_next_info( w, cache )
end while w.FindNextUrlCacheEntry.Call(cache, info, infosize) != 0
end
w.FindCloseUrlCache.Call(cache)
i
end

def get_first_info(api)
sizenum = [0,0].pack(’L*’)
buf =  [1024,0].pack(’L*’).ljust(1024)
r = api.FindFirstUrlCacheEntry.Call(nil,nil,sizenum)
n = sizenum.unpack(’L')[0]
info = sizenum.ljust(n)
[info,sizenum]
end

def get_next_info(api, handle)
sizenum = [0,0].pack(’L*’)
buf =  [1024,0].pack(’L*’).ljust(1024)
r = api.FindNextUrlCacheEntry.Call(handle,nil,sizenum)
n = sizenum.unpack(’L')[0]
info = sizenum.ljust(n)
[info,sizenum]
end

#
# Win32 API used in this file is listed here.
# Each system call can be instatiated like this
#    DeleteUrlCacheEntry = Win32API.new(”wininet”, “DeleteUrlCacheEntry”, ['P'], ‘V’)
# Instead, the functions are defined dynamically from this list:
#
FUNCS = {
‘FindFirstUrlCacheEntry’ => ['ppp','n'],
‘FindNextUrlCacheEntry’  => ['npp','n'],
‘DeleteUrlCacheEntry’    => ['n',  'n'],
‘FindCloseUrlCache’      => ['n',  'n']
}

#
# get_api returns a hash with Win32 API system calls
# Usage:
#     api = get_api(’Kernel32′, {’GetLastError’=>['V', 'N'],…})
#
def get_api(library, function_hash)
f = MethodHash.new
function_hash.each{|funcname,types|
in_types = types[0].collect_char{|x| x}
out_type = types[1]
f[funcname] = Win32API.new(library, funcname, in_types, out_type)
}
f
end

def getLastError
f = Win32API.new(’Kernel32′, ‘GetLastError’, ['V'], ‘N’)
f.call
end

if __FILE__ == $0
n = main
# print “Deleted #{n} items\n”
end

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# Your testfile.rb

dir = File.dirname(__FILE__)
require “#{dir}\/lib\/del_cache” #clear cookies & cache, call main
require “watir”
require ‘Win32API’

puts “- Clear cache and cookies”

main

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