| #建立一個222.rb檔案並且輸入字元 file = File.open("222.rb","w+") file.puts "123\nwadwa\n12124124\ndwdw" file.close #輸出222.rb的內容 File.open("222.rb","r+") do |file| while line = file.gets puts line end end #直接用IO操作檔案 IO.foreach("222.rb") do |line| puts line if line =~/abc/ #輸出匹配到了'abc'的所在行 puts line if line !~/qwe/ #輸出沒有匹配到'qwe'的所在行 end #輸出檔案的絕對路徑 puts File.expand_path("222.rb") #count chars from a file file= File.new("222.rb") w_count = 0 file.each_byte do |byte| w_count += 1 if byte ==?1 end puts "#{w_count}" #create new file and write some words there print "The file now is exist? --> " puts File.exist?("asd.txt")#判斷檔案是否存在 file= File.new("asd.txt","w") print "The file now is exist? --> " puts File.exist?("asd.txt") file.write("hehe\nhahah") #io.stream operation require 'stringio' ios = StringIO.new("abcdef\n ABC \n 12345") ios.seek(5) #把位移指標移到5(e字母所在位置) ios.puts("xyz3") #從5開始覆寫原有資料 puts ios.tell #tell--Returns the current offset (in bytes) of ios. puts ios.string puts ios.string.dump #忽略\n的轉義 #another example require 'stringio' ios = StringIO.new("abcdef\nq9ert \n 12345") ios.seek(3) ios.ungetc(?w) #replace the char at index 3 puts "Ptr = #{ios.tell}" s1 = ios.gets #filte the "\n" s2 = ios.gets puts s1 puts s2 #Ruby開啟檔案並寫入資料操作 txt = File.open("檔案路徑","w+") txt.puts '要寫入的檔案內容' txt.close #從檔案裡讀取資料 num = File.readlines("檔案路徑")[0].chomp #開啟檔案的方法 system("notepad 檔案路徑") |