From: djberg96@... (Daniel Berger)
Date: 2004-11-16T04:28:20+09:00
Subject: Re: Win32, file descriptors and rb_io_check_writable()

"Park Heesob" <phasis@bcline.com> wrote in message news:<003c01c4c91f$1c2718f0$bcdefea9@2xnm9896kmqn5b9>...
<snip>
> > 
> Following code will work:
> 
> #define OpenFile  WINAPI_OpenFile 
> #include <windows.h>
> ..
> #undef OpenFile 
> #include "ruby.h"
> #include "rubyio.h"
> ..
<snip>

>    // Convert HANDLE to file descriptor
>    args[0] = UINT2NUM(_open_osfhandle((long)h,O_RDWR));
> 
>    RFILE(self)->fptr->mode = rb_io_mode_flags("w+");                     //  mode string correspond to dwAccess 
>    RFcorrespond to dwAccess 
> 
>    // Return a bonafide File object, based on the file descriptor
>    return rb_class_new_instance(1,args,rb_cFile);
> }

> 
> Regards,
> 
> Park Heesob

Thank you very much Park.  There is one curious difference I noticed
with the write operations.  It seems that there is a line ending issue
between a file descriptor opened with File.open vs File.nopen.  You
can see this easily enough by doing something like this:

fh1 = File.open("test1.txt","w+")
fh1.print "hello\nworld\n"
fh1.close

Open this up with notepad - looks fine.  Now try this:

fh2 = File.nopen("test2.txt",nil,nil,File::OPEN_ALWAYS)
fh2.print "hello\nworld\n"
fh2.close

Opened with notepad, you'll see that the line endings aren't the same
(although wordpad handles them properly).  I guess I should find an
octal dump tool for windows to verify.  Hopefully, you'll see what I
mean.

Regards,

Dan