Is There Any Reliable Golang Library Which Converts PDF File To Image?

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Is there any reliable Golang library which converts PDF file to Image file (jpeg, tiff, png etc.)?

What are you trying to do, exactly, and what do you mean by "in-memory file?" There's no such thing as an "in-memory file" — the only thing you ever have in memory is a sequence of bytes, perhaps read from a file. Indeed, that string you have is just such a sequence of bytes. For bytes that correspond to a printable character, Ruby displays the printable character. For bytes that don't, Ruby escapes the byte and uses its hexadecimal representation. In Ruby, the string "PNG\n" could also be written "\x50\x4E\x47\x0A", for example. That \x is an escape sequence which says to Ruby, "We have a byte represented in hexadecimal coming up." If you have a string like that you can simply write it to a file as you would any other string, like so. File.write("whatever.png", png_data) Ruby will read the sequence of bytes in the string and write them to whatever.png. The resulting file will be a valid PNG file, assuming png_data is valid PNG data. I think in Windows you might have to tell File.write to be in "binary mode" vs. "text mode." I don't know about that for sure, though, and I couldn't tell you the difference between the two. In any UNIX there's no difference — bytes go in, bytes go out. If by "in-memory file" you mean you need to take that string and pass it to another method that expects something which respects the IO interface then you can use StringIO (Ruby 2.1.0) to wrap your string in an object which does just that.

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In my example above I wrapped all the lines in a string and then passed that string to some_to_be_written which expects bytes. The resulting byte is then converted to character and passed back to the string wrapper. In Ruby 2.2.0, String(#to_f) will also automatically convert to a string. You can also write directly into the string — just pass all the bytes you want in, but leave the #to_f in the string. Using String is a huge improvement over String, and you should think to use it where you might otherwise use String (e.g.: creating a logger, if you want to write to a log file) or File (e.g.: writing data to a file). I wrote a bit about String in the previous post.

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