include? only true once

[Matthew Margolis]

blockFile = File.new("blocklist.txt", "a+")
print blockFile.read.include?("aa")
print blockFile.read.include?("aa")

blocklist.txt looks like
--------------------------------------------
aa
ae
aj
au
ae
---------------------------------------------


Why does #include? return true on the first call only?


Thank you,
Matthew Margolis

 

[David A. Black]

Hi --

blockFile = File.new("blocklist.txt", "a+")
print blockFile.read.include?("aa")
print blockFile.read.include?("aa")

blocklist.txt looks like
--------------------------------------------
aa
ae
aj
au
ae

Because you've reached end-of-file


David

 

[Matthew Margolis]

Hi --



Because you've reached end-of-file


David

blockFile = File.new("blocklist.txt", "a+")
print blockFile.read.include?("aa")
blockFile.lineno = 0
print blockFile.read.include?("aa")

Still gives true false instead of true true

-Matthew Margolis

 

[David A. Black]

Hi --

blockFile = File.new("blocklist.txt", "a+")
print blockFile.read.include?("aa")
blockFile.lineno = 0
print blockFile.read.include?("aa")

Still gives true false instead of true true

I'm ignorant of #lineno= but it doesn't seem to affect EOF. (If you
add an EOF test it will come out true.) But you could use #pos to get
back to the beginning of the stream.


David

 

[Matthew Margolis]

Hi --



I'm ignorant of #lineno= but it doesn't seem to affect EOF. (If you
add an EOF test it will come out true.) But you could use #pos to get
back to the beginning of the stream.


David

Excellent, thank you.

-Matthew Margolis

 

[Robert Klemme]

Excellent, thank you.

-Matthew Margolis

Why don't you just:

# complete:
content = File.read("blocklist.txt")
print content.include?("aa")
print content.include?("aa")

# line oriented:
content = File.readlines("blocklist.txt")
print content.include?("aa")
print content.include?("aa")


Much more efficient if the file fits into mem.

Kind regards

robert