private jsp server

private jsp server IO.foreach("testfile") { |line| puts line } produces: This is line one This is line two This is line three And so on... Or, if you prefer, you can retrieve an entire file into an array of lines: arr = IO.

private jsp server readlines("testfile") arr.length » 4 arr[0] » "This is line one\n" Don't forget that I/O is never certain in an uncertain world---exceptions will be raised on most errors, and you should be ready to catch them and take appropriate action. Writing to Files So far, we've been merrily calling puts and print, passing in any old object and trusting that Ruby will do the right thing (which, of course, it does). But what exactly is it doing? The answer is pretty simple. With a couple of exceptions, every object you pass to puts and print is converted to a string by calling that object's to_s method.

private jsp server If for some reason the to_s method doesn't return a valid string, a string is created containing the object's class name and id, something like <ClassName:0x123456>. The exceptions are simple, too. The nil object will print as the string ``nil,'' and an array passed to puts will be written as if each of its elements in turn were passed separately to puts. What if you want to write binary data and don't want Ruby messing with it? Well, normally you can simply use IO#print and pass in a string containing the bytes to be written. However, you can get at the low-level input and output routines if you really want---have a look at the documentation for IO#sysread and IO#syswrite on page 335.

private jsp server

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private jsp server