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I'm working with an IO object (some STDOUT output text), and I'm trying to convert it to a string so that I can do some text processing. I would like to do something like this:
my_io_object = $stdout #=> #<IO:<STDOUT>> my_io_object.puts('hi') #note: I know how to make 'hi' into a string, but this is a simplified example #=>hi my_io_object.to_s I have tried a few things and gotten a few errors:
my_io_object.read #=> IOError: not opened for reading my_io_object.open #=> NoMethodError: private method `open' called for #<IO:<STDOUT>> IO.read(my_io_object) #=> TypeError: can't convert IO into String I've read through the IO class methods, and I can't figure out how to manipulate the data in that object. Any suggestions?
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Basically, it makes a string look like an IO object, hence the name StringIO. The StringIO class has read and write methods, so it can be passed to parts of your code that were designed to read and write from files or sockets.
The IO class is the basis for all input and output in Ruby. An I/O stream may be duplexed (that is, bidirectional), and so may use more than one native operating system stream. Many of the examples in this section use the File class, the only standard subclass of IO . The two classes are closely associated.
To convert an string to a integer, we can use the built-in to_i method in Ruby. The to_i method takes the string as a argument and converts it to number, if a given string is not valid number then it returns 0.
I solved this by directing my output to a StringIO object instead of STDOUT:
> output = StringIO.new #<StringIO:0x007fcb28629030> > output.puts('hi') nil > output.string "hi\n" If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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