From: Qaz Qaz <bangingtechno@...>
Date: 2010-10-08T01:43:29+09:00
Subject: Open a windows device file handle in ruby?

Hello, I have windows device driver which creates a symbolic link for
the path '\\.\MyDevice'. In C I can then use CreateFile() to open this
device, e.g.

---[c
snippet]------------------------------------------------------------------
handle = CreateFile( "\\\\.\\MyDevice", GENERIC_READ|GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL );

WriteFile( handle, data, len, &written, NULL );

CloseHandle( handle  );
---[c
snippet]------------------------------------------------------------------

However in Ruby, I should be able to simple use something like:

---[ruby
snippet]---------------------------------------------------------------
handle = open( "\\\\.\\MyDevice", File::RDWR )
handle.syswrite( data )
handle.close
---[ruby
snippet]---------------------------------------------------------------

but it does not work and segfaults the ruby interpreter during the open!

Can anybody please help as to what I am doing wrong. How do you open a
file handle to a device in windows?

Thanks!
-- 
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