Re: [Caml-list] Returning a file handle from C (fopen)

["Eric C. Cooper" <ecc@cmu.edu>]

On Tue, Sep 21, 2004 at 06:06:20PM -0400, Jeremy Cowgar wrote:
> I am trying to return a file handle from C. A simple Val_long does not
> work, so I did some research and found something like the following:
> 
>   return caml_alloc_channel(caml_open_descriptor_out(myhandle));
> [...] 
> Anyway, my real problem lies in the fact that when I do something like:
> 
> let fh = get_my_out_handle () in
> Printf.fprintf fh "Hello, World!\n";;
> 
> nothing appears in my output file. No warning, errors or anything. In my
> C source, I can do the exact thing and the contents are written.

Have you called either flush or close_out on your handle?  The OCaml
channel values add a layer of buffering, similar to C stdio, on top of
the file descriptor.

-- 
Eric C. Cooper          e c c @ c m u . e d u

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