lua的utf8互转gbk编码方法

lua的utf8互转gbk编码方法, 基于linux下实现，使用lua-iconv的.

安装：
luarocks install lua-iconv

安装过程感觉有点慢，那个lua-iconv网址有时获取不到，不行的时候就再尝试下吧.

然后以下就是转换代码：

local iconv = require("iconv")
http=require("socket.http")
 

function createIconv(from,to,text)  

  local cd = iconv.new(to .. "//TRANSLIT", from)

  local ostr, err = cd:iconv(text)

  if err == iconv.ERROR_INCOMPLETE then
    return "ERROR: Incomplete input."
  elseif err == iconv.ERROR_INVALID then
    return "ERROR: Invalid input."
  elseif err == iconv.ERROR_NO_MEMORY then
    return "ERROR: Failed to allocate memory."
  elseif err == iconv.ERROR_UNKNOWN then
    return "ERROR: There was an unknown error."
  end
  return ostr
end


result=http.request("https://www.lpfrx.com")
 
print(createIconv("utf-8","gbk",result))

反正就是lua库的问题，windows下luarocks安装不了lua-iconv, 这个要再找找怎么样解决，反正有时间先.