From: djberg96@... (Daniel Berger)
Date: 2004-11-16T03:23:20+09:00
Subject: Re: Win32, file descriptors and rb_io_check_writable()

nobu.nokada@softhome.net wrote in message news:<200411150121.iAF1LCVW027655@sharui.nakada.niregi.kanuma.tochigi.jp>...
> Hi,
> 
> At Sat, 13 Nov 2004 08:13:26 +0900,
> Daniel Berger wrote in [ruby-talk:120101]:
> > But, I cannot write to the filehandle:
> > 
> > fh = File.nopen("C:\\somefile")
> > fh.puts "Hello"
> > 
> > test.rb:13:in `write': not opened for writing (IOError)
> >         from test.rb:13:in `puts'
> >         from test.rb:13
> > 
> > That error appears to be coming from the rb_io_check_writable()
> > function, which in turn is checking the mode of the OpenFile struct
> > defined in rubyio.h.
> > 
> > How do I deal with this?  Am I doing something wrong?  Or would it
> > take a modification of io.c for this to work?  If so, what should be
> > done?
> 
> File#initialize accepts the mode in Fixnum.
> 
> >    // Convert HANDLE to file descriptor
> >    args[0] = UINT2NUM(_open_osfhandle((long)h,O_RDWR));
>      switch (dwAccess & (GENERIC_READ|GENERIC_WRITE)) {
>        case 0:
>          args[1] = INT2FIX(0);
>          break;
>        case GENERIC_READ:
>          args[1] = INT2FIX(O_RDONLY);
>          break;
>        case GENERIC_WRITE:
>          args[1] = INT2FIX(O_WRONLY);
>          break;
>        default:
>          args[1] = INT2FIX(O_RDWR);
>          break;
>      }
> >    
> >    // Return a bonafide File object, based on the file descriptor
>   return rb_class_new_instance(2,args,klass);
> > }

This code does eliminate that error.  However, it seems that the write
operations still don't work properly.  I can call fh.puts "hello" and,
although no error is raised, nothing is actually written to the file.

Any thoughts?

Dan