-- Desc ：实现在LUA_PATH中的lua文件中遍历寻找没用到PNG_PATH路径下的png图片，并将其打印出来。
  -- Date ：12:49:28 2014-09-04 
 1 print("Lua Script Start")

 function getFileName( path )

     len = string.len(PNG_PATH);

     return string.sub(path, len+) --  remove "/"

 end

 function isInIt( file,name )

     --print(file .. " -- " .. name )

     for line in io.lines(file) do

         if isContain(line , name) then

             return true;

         end

     end

     return false;

 end

 function isContain( line , str )

     return string.find(line , str);

 end

 PNG_PATH = "user/image"

 getPngFileTable = io.popen('find * ' .. PNG_PATH)

 pngFileTable = {};

 for file in getPngFileTable:lines() do

     if string.find(file,"%.png$") then

         fileName = getFileName(file);

         print(fileName)

         table.insert(pngFileTable,fileName);

     end

 end

 print("png count is :"..#pngFileTable);

 LUA_PATH = "user/scripts"

 getLuaFileInfo = io.popen('find * ' .. LUA_PATH)

 luaFileTable = {};

 for file in getLuaFileInfo:lines() do

     if string.find(file,"%.lua$") then

         --print(file)

         table.insert(luaFileTable,file);

     end

 end

 local pairs = pairs

 for _,name in pairs(pngFileTable) do

     flag = ;

     for _,file in pairs(luaFileTable) do

         if isInIt(file , name) then

             flag = ;

             break;

         end

     end

     if flag ==  then

         print(name)

     end

 end

 print("Lua Script End!")

 --Desc: lua io.popen ([prog [, mode]])

     --Starts program prog in a separated process and returns a file handle that

     --you can use to read data from this program (if mode is "r", the default)

     --or to write data to this program (if mode is "w").

     --This function is system dependent and is not available on all platforms.