Cache Syntax - Directory Exists

Question

Question

Scott Roth · Nov 22, 2016

I am trying to write some code to check to see if a directory exists before creating a new directory.

When I do the following I am not getting a response, but the directory exists..

do ##class(%File).DirectoryExists("/ensemble/")

am I missing something?

Discussion (5)1

Log in or sign up to continue

Pete Greskoff · Nov 22, 2016

You aren't actually writing a response. To get the result in the terminal, you'd need to 'write' the output instead of 'do'.

2 0

score 5 · Answer 1 · 2016-11-22T08:55:53-05:00

How do you expect to get the response in your command?

If you read documentation carefully, you will find:

classmethod DirectoryExists(filename As %String) as %Boolean

Tests if filename is a directory. returns 1 if it is a directory, otherwise, returns 0.

So, you should set the result of this function to some value.

set result=##class(%File).DirectoryExists("/ensemble/")

score 0 · Answer 2 · 2016-11-22T12:27:45-05:00

Scott Roth · Nov 22, 2016

if I run it from the command line I was expecting for it to return me a 1. Is that not possible?

0 0

score 0 · Answer 3 · 2016-11-22T17:16:04-05:00

I found by using %Library.File it worked better.

w ##class(%Library.File).DirectoryExists("/ensemble/")
1
w ##class(%Library.File).DirectoryExists("/ensemble/Scott/")
1
w ##class(%Library.File).DirectoryExists("/joe")
0
w ##class(%Library.File).DirectoryExists("/joe/")
0

Thanks for your help.

score 1 · Answer 4 · 2016-11-22T17:47:26-05:00

Did it work better than what?

Both classes are really the same one, as %Library is the default package name for %-classes.