How call to value of Windows vars from Julia?

General Usage
1

I try working with *.bat and *exe file in window from Julia level.
Is file vol.bat with:

cmd
vol

inside.

I am trying get value of number HD to some julia variable

julia> myc=`vol.bat`
`vol.bat`

julia> x=run(myc)

C:\Users\PC\AppData\Local\Julia-0.7.0>cmd
Microsoft Windows [Wersja 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. Wszelkie prawa zastrzeżone.

C:\Users\PC\AppData\Local\Julia-0.7.0>vol
 Wolumin w stacji C nie ma etykiety.
 Numer seryjny woluminu: 0EA8-3B46
Process(`vol.bat`, ProcessExited(0))

C:\Users\PC\AppData\Local\Julia-0.7.0>exit

julia> x
Process(`vol.bat`, ProcessExited(0))

How to do it ? I expect somthink like:

x==" Wolumin w stacji C nie ma etykiety.
 Numer seryjny woluminu: 0EA8-3B46"

Propably is simplest way …
Paul

1 Like
2 
shell> cat vol.bat
vol

julia> myc = `vol.bat`
`vol.bat`

julia> x = read(myc, String)
"\r\nC:\\Users\\Kristoffer>vol\r\n Volume in drive C has no label.\r\n Volume Serial Number is 2458-0EE6\r\n"

julia> print(x)

C:\Users\Kristoffer>vol
 Volume in drive C has no label.
 Volume Serial Number is 2458-0EE6

maybe

1 Like
3

Yes, yes yes,
Thanks
if

t="\r\nC:\\Users\\Kristoffer>vol\r\n Volume in drive C has no label.\r\n Volume Serial Number is 2458-0EE6\r\n"

julia> Meta.parse(t)
ERROR: Base.Meta.ParseError("\"\\\" is not a unary operator")
Stacktrace:
 [1] #parse#1(::Bool, ::Bool, ::Bool, ::Function, ::String, ::Int64) at .\meta.jl:129
 [2] #parse at .\none:0 [inlined]
 [3] #parse#4(::Bool, ::Bool, ::Function, ::String) at .\meta.jl:164
 [4] parse(::String) at .\meta.jl:164
 [5] top-level scope at none:0
4

That’s not Julia code, so calling Meta.parse on it fails with a parse error.

5

You can use split() for example to parse the text. I assume you searched for “parse” and found that Meta.parse, which as Stefan already told not what you want.

Here are some examples:

julia> t = "\r\nC:\\Users\\Kristoffer>vol\r\n Volume in drive C has no label.\r\n Volume Serial Number is 2458-0EE6\r\n"
"\r\nC:\\Users\\Kristoffer>vol\r\n Volume in drive C has no label.\r\n Volume Serial Number is 2458-0EE6\r\n"

julia> split(t, "\r\n")
5-element Array{SubString{String},1}:
 ""
 "C:\\Users\\Kristoffer>vol"
 " Volume in drive C has no label."
 " Volume Serial Number is 2458-0EE6"
 ""

julia> split(t)[end]
"2458-0EE6"

Or regular expressions using match:

julia> match(r"Serial Number is (.*)\r\n", t)[1]
"2458-0EE6"
1 Like