class MarshalFile

Marshal File Writing and Reading¶ ↑

Write Example:¶ ↑

a = {1=>2, 3=>4}
c = {5=>6, 7=>8}
mf = MarshalFile.new("test.marshal","write")
mf.write(a)
mf.write(c)
mf.close

Read Example:¶ ↑

mf = MarshalFile.new("test.marshal")
while !mf.eof
  puts mf.read
end
mf.close

Public Class Methods

new(filename = nil,mode="read") click to toggle source

initialize parameters:¶ ↑

filename = name of file
mode = "read" (default), "write", "append"

# File lib/marshal_file.rb, line 25
def initialize(filename = nil,mode="read")
  @filename = filename
  if @filename == nil
    @filename = File.join(Rails.root, 'log', 'NoName-'+Time.now.localtime.strftime("%Y-%m-%d")+".marshal")
  end
  @open = true
  if mode == "read"
    if FileTest::exist?(@filename)
      @file = File.open(@filename, 'rb')
    else
      @open = false
      puts @filename + " not found"
    end
  end
  if mode == "write"
      @file = File.open(@filename, 'wb')
  end
  if mode == "append"
      @file = File.open(@filename, 'ab')
  end
end

Public Instance Methods

close() click to toggle source

close the marshal file

# File lib/marshal_file.rb, line 86
def close
  if @open
    @file.close
    @open = false
  end
end

delete() click to toggle source

delete the marshal file.

# File lib/marshal_file.rb, line 95
def delete
  if @open
    close
  end
  if FileTest::exist?(@filename)
    File.delete(@filename)
  else
    puts @filename + " does not exist"
  end
end

eof() click to toggle source

check for eof while !mf.eof

puts mf.read

end

# File lib/marshal_file.rb, line 52
def eof
  if @open
    return @file.eof? 
  else
    puts "file not open for reading"
    return false
  end
end

read() click to toggle source

read from marshal file must be opened in read mode

# File lib/marshal_file.rb, line 64
def read
  if @open
    return Marshal.load(@file)
  else
    puts "file not open for reading"
  end 
end

write(val) click to toggle source

write to marshal file must be opened in append or write mode

# File lib/marshal_file.rb, line 75
def write(val)
  if @open
    Marshal.dump(val,@file)
  else
    puts "file not open for writing"
  end
end