Lua's way of determining whether a directory or file exists

This article mainly introduces LUA to determine the existence of a directory or file, Lua can use Io.open to determine whether a file or directory exists, this article summarizes the method of judgment, and gives a custom function, the need for friends can refer to the

First, the use of Io.open

Open a bit and it's OK.

The code is as follows:

File,err=io.open ("XXXX")

Err is nil if the file is opened normally with file handle. Otherwise file is nil and err is the error message "Drr:no such file or directory."

You just need to open it. Then look at the return value.

The code is as follows:

Somefile= "Xxxj.pdf"

Local F,err=io.open (Somefile, "r+");

Print (ERR)

If the file does not exist, err will contain relevant information.

Two, Custom function

The code is as follows:

function file_exists (path)

Local file = Io.open (path, "RB")

If file then File:close () end

Return file ~= Nil

End