From: why the lucky stiff <ruby-talk@...>
Date: 2003-07-18T04:34:30+09:00
Subject: Re: Can I write to a File object from a C extension?

On Thursday 17 July 2003 12:39 pm, Tim Hunter wrote:
> I have a function written in C that wants to write to a FILE *
> returned from fopen. I'd like to use this function to write to a File
> object that has been opened for output by File.open().
>
> Is this possible? If so, how?

Poke around in rubyio.h and you'll find some macros and functions pertinent to 
this.

  VALUE rubyFilePtr;
  OpenFile *openFilePtr;
  FILE *cFilePtr;

  rubyFile = rb_file_open( 'filename', 'rw' );
  GetOpenFile(rubyFilePtr, openFilePtr);
  rb_io_check_writable(openFilePtr);
  cFilePtr = GetWriteFile(openFilePtr);

_why