From: Guillaume Marcais <guslist@...>
Date: 2004-12-09T12:17:57+09:00
Subject: Re: Pointer of pointer with Ruby/DL

Le 8 d�c. 04, � 12:25, Kent Sibilev a �crit :

> Try this:
> msgp = DL.malloc(DL.sizeof('P'))
> r = Tenant2Auth.public_tenant2_auth_pap_auth("coucou", "titi", 
> msgp.ref)
> puts msgp.to_s

Works great, thanks.

Guillaume.

> Cheers,
> Kent.
> On Dec 8, 2004, at 10:13 AM, Guillaume Marcais wrote:
>
>> I have the following C prototype:
>>
>> int auth(char *user, char *passwd, char **msgp);
>>
>> I pass user and passwd, and I get in response 0 or 1 for success or
>> failure and a message in *msgp.
>>
>> How can i call this function from Ruby using Ruby/DL? So far I did the
>> following:
>>
>> <code>
>> module Auth
>>   extend DL::Importable
>>   dlload "./auth.so"
>>   extern "int auth(char *, char *, char **)"
>> end
>>
>> msgp = [0].pack('L').to_ptr
>> r = Tenant2Auth.public_tenant2_auth_pap_auth("coucou", "titi", msgp)
>> </code>
>>
>> I get the correct result in 'r'. But how do I get access to the string
>> in *msgp?
>>
>> I guess I don't yet have a good grasp on pointer dereferencing with
>> Ruby/DL.
>>
>> Anyone?
>>
>> Guillaume.
>>
>>
>
>