string - 在 Lua 中将字符串写入二进制

Question

我在 Lua 中将字符串写入二进制文件时遇到问题。有一个现有示例，我尝试修改它。看一看:

function StringToBinary()
  local file = io.open("file.bin", "wb")
  local t = {}
  local u = {}
  local str = "Hello World" 
  file:write("string len = " ..#str ..'\n')
  math.randomseed(os.time())
  for i=1, #str do
    t[i] =  string.byte(str[i])
    file:write(t[i].." ");   
  end  
  file:write("\n")
  for i=1, #str do 
    u[i] = math.random(0,255) 
    file:write(u[i].." ");
  end
  file:write("\n"..string.char(unpack(t)))
  file:write("\n"..string.char(unpack(u)))
  file:close()
end

file:write(t[i].."") 和 file:write(u[i].."") 用整数值写入两个表.然而，在我的最后两篇文章中:unpack(t) 显示原始文本，而 unpack(u) 显示二进制文件。

可能是 string.byte(str[i]) 弄错了。我应该用什么来代替它？我错过了什么吗？

Answer 1

t[i] =  string.byte(str[i])

错了，应该是:

t[i] =  string.byte(str, i)