Lua读写文件代码示例

读写文件的模式：

r - 读取模式w - 写入模式(覆盖现有内容) 
a - 附加模式(附加在现有内容之后) 
b - 二进制模式 
r+ - 读取更新模式(现有数据保留) 
w+ - 写入更新模式(现有数据擦除) 
a+ - 附加更新模式(现有数据保留，只在文件末尾附加) 

do 
  --read data from file 
 
  function readfile() 
    local filehandle = assert(io.open("test.txt", "r"), "not the file"); 
    if filehandle then 
      local outdata = filehandle:read("*all"); 
      print(outdata); 
    else 
      print("false"); 
    end 
      filehandle:close(errorinfo); 
  end 
 
  --write data to the file 
  function writefile(databuffer) 
    local writehandle = assert(io.open("write.txt", "a+"), "not the file"); 
 
    if writehandle then 
      writehandle:write(databuffer); 
      print("true"); 
    else 
      print("false"); 
    end 
 
    writehandle:close(); 
  end 
 
 
  local inputdata = 0; 
 
  repeat 
    inputdata = io.read(); --write the data from io 
    writefile(inputdata); 
  until inputdata == '#' 
 
 
end