Re: Help with nlffi

Hi Natalia,

I highly recommend you use the math example which is in the sml  
source tree.
It's a very good example to start with.

To access your "something" you just need to do :

F_something.f()

I also recommend compiling foo.c to a dynamic library and use dynamic  
loading.  Dynamic loading is really the best way to take advantage of  
nlffi.

A simple example should not be too many files, you could just post  
the source code for more help.

Brian


On Apr 6, 2006, at 3:06 PM, Natalia Beatriz Bidart wrote:

> Hi,
>
> After following step by step the README placed on $SMLNJ_HOME/src/ 
> ml-nlffigen, I can't make the example work :-(.
>
> I've just coded a really dummy foo.h (which uses no library at  
> all), and when running "sml -m foo.cm" I got the following:
>
> bn@DALI:~/tesis/nlffi-tests/example$ sml -m foo.cm
> Standard ML of New Jersey v110.58 [built: Fri Mar 24 12:51:04 2006]
> [scanning foo.cm]
> [scanning $/c.cm]
> foo.cm:4.13-5.6 Error: Io: openIn failed on "$Undef<c.cm>/c.cm", No  
> such file or directory
> [attempting to load plugin $/make-tool.cm]
> [library $/make-tool.cm is stable]
> [library $smlnj/internal/cm-lib.cm is stable]
> [library $smlnj/internal/srcpath-lib.cm is stable]
> [library $SMLNJ-LIB/Util/smlnj-lib.cm is stable]
> [library $SMLNJ-BASIS/basis.cm is stable]
> $Execute: required privileges are:
>   cm-init
> [library $smlnj/cm/cm.cm is stable]
> [library $smlnj/internal/cm-sig-lib.cm is stable]
> [library $/pgraph.cm is stable]
> [library $smlnj/internal/cm0.cm is stable]
> [library $smlnj/cm/tools.cm is stable]
> [plugin $/make-tool.cm loaded successfully]
> [make -f foo.make SMLNJ_BINDIR=/usr/local/sml/bin FFI/foo.cm]
> make: `FFI/foo.cm' is up to date.
> -
>
> My foo.h has only the following line:
>
> int something(void);
>
> After the automatic generation done with ml-nlffigen, I've got an  
> structure F_something with an 'f' function defined.
>
> I'm not sure if above ml's output is failing or not, but I've tried  
> to invoke F_something.f in the interpreter and I get:
> - F_structure.f();
> stdIn:1.1-1.14 Error: unbound structure: F_structure in path  
> F_structure.f
>
> Can any of you please clarify how do I have to call the generated  
> code?
>
> Thanks, Natalia.
>
>
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