Reading external files

honoluludesktop

chosen_file is a external file. I would like to search the chosen_file line by line for "XXXX", then save the next line in the data array. How do I increment the read file pointer to the next line?

aFile = File.open(chosen_file, "r")
Data = []
#Search each line for "XXXX"
aFile.each_line do |line|
  If line == "XXXX" #if found
    #How do I get next_line, to save to Data
    Data.push next_line
  end
end
aFile.close

thomthom

aFile.read_line ?

honoluludesktop

The following generates error message:
undefined method ‘read_line’ for #<File:C:TEST.DAT>

aFile = File.open(chosen_file, "r")
aFile.each_line do |line|
    aFile.read_line
end
aFile.close

Didier Bur

array_of_lines=IO.readlines(chosen_file)

Will let you do what you want, line by line or not, no pointer, no nothing

honoluludesktop

Didier, Thanks. I will try that when I go to the office later today

honoluludesktop

Well, that created an array of the whole file. Can I just get the next (n) line? I can do it with a counter as attached, but the code gets complicated when searching for many different line descriptions.

aFile = File.open(chosen_file, "r")
SaveIt = []
count = 0
line_location = -1
aFile.each_line do |line|
  count = count + 1
  if line == "xxxx"
    #calculate the location of the next line
    line_location = count + 1
    #test if location and current line match
    else if line_location == count
       SaveIt.push line
    end
  end
end
aFile.close

Didier Bur


.../...
array_of_lines=IO.readlines(chosen_file)
saveIt = []
skipNext=false
0.upto(array_of_lines.length-1) { |i|
  if line[i] == "xxxx" and !skipNext
    saveIt.push(array_of_lines[i+1])
    skipNext=true
  else
    skipNext=false
  end
}
.../...

honoluludesktop

:-0....now I get it, thanks.