How does Lua read specific text content?

In Lua, we can open a specified text file using the io.open function and read all the content in the file using file:read(“*all”).

Here is an example code:

function readTextFile(fileName)
  local file = io.open(fileName, "r")  -- 打开文件
  if not file then
    return nil
  end
  local content = file:read("*all")  -- 读取文件内容
  file:close()  -- 关闭文件
  return content
end

local fileName = "example.txt"  -- 指定文本文件名
local text = readTextFile(fileName)  -- 读取文本文件内容
if text then
  print(text)
else
  print("无法读取文件")
end

In the above example, the readTextFile function takes a file name as a parameter, then opens the file using the io.open function and assigns it to the file variable. If the file opens successfully, the file:read(“*all”) function is used to read the entire content of the file and assign the result to the content variable. Finally, the file:close() function is used to close the file.

The text content that is read can be further processed, such as being split by lines or manipulated as strings.