On Wed, May 25, 2016 at 2:41 PM, Fernando Santagata <
nando.santag...@gmail.com> wrote:

> gboolean        notify_get_server_info (char **ret_name,
>                                         char **ret_vendor,
>                                         char **ret_version,
>                                         char **ret_spec_version);
> I think that the four arguments return the information about the system.
> The problem here is that I'm not an expert on NativeCall, which I'm just
> beginning to love, and I don't know how to map those char **.
> What I concocted on the Perl6 side so far is this:
> sub notify_get_server_info(Str $name is rw, Str $vendor is rw, Str
> $version is rw, Str $spec_version is rw) returns Bool is native('notify',
> v4) is export {};
> The calling program goes like this:
> my Str ($name, $vendor, $version, $spec_version);
> if notify_get_server_info($name, $vendor, $version, $spec_version) {
>   say $name, $vendor, $version, $spec_version;
> }else{
>   say 'No server info';
> }
> and it prints
> (Str)(Str)(Str)(Str)
> So, I get that the mapping is wrong.

In this case, you need to pass a Pointer[Str] which will be filled in by
the C function. Just using a Str directly passes a (char *), not a (char
**), and you ended up with a pointer where rakudo expected characters.

brandon s allbery kf8nh                               sine nomine associates
allber...@gmail.com                                  ballb...@sinenomine.net
unix, openafs, kerberos, infrastructure, xmonad        http://sinenomine.net

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