SWIG and Ruby Arrays

[Bryan Richardson-4]

Hello all,

I'm new to SWIG, so please bear with me!  :)  I have a C program that among other things defines a structure and has a method that accepts an array of those structures, similar to the following:

/* people.h header file */
typedef struct {
  char* name;
} Person;

void say_hello(Person[] people);

/* source file */
#include <stdio.h>
#include "people.h"

void say_hello(int count, Person* people) {
  int index;
  for (index = 0; index < count; index++) {
    printf("Hello, my name is %s\n", people[index]);
  }
}

I'm using SWIG to wrap this library (in an Example module) so I can call it from Ruby.  From Ruby, I can create new Person objects and set their names no problem.  However, when I put them into a Ruby array and then try to send that array to the say_hello method I get an error:

p1 = Example::Person.new
p1.name = "Bryan"
p2 = Person.new
p2.name = "John"

a = Array.new
a << p1
a << p2

Example.say_hello(a.length, a)

TypeError: in method 'say_hello', argument 2 of type 'Person *'

Can anyone tell me how I can configure SWIG such that I can create and pass arrays like this?

--
Thanks!
Bryan



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[Bryan Richardson-4]

Hello all,

I'm new to SWIG, so please bear with me!  :)  I have a C program that among other things defines a structure and has a method that accepts an array of those structures, similar to the following:

/* people.h header file */
typedef struct {
  char* name;
} Person;

void say_hello(Person[] people);

/* source file */
#include <stdio.h>
#include "people.h"

void say_hello(int count, Person* people) {
  int index;
  for (index = 0; index < count; index++) {
    printf("Hello, my name is %s\n", people[index]);
  }
}

I'm using SWIG to wrap this library (in an Example module) so I can call it from Ruby.  From Ruby, I can create new Person objects and set their names no problem.  However, when I put them into a Ruby array and then try to send that array to the say_hello method I get an error:

p1 = Example::Person.new
p1.name = "Bryan"
p2 = Person.new
p2.name = "John"

a = Array.new
a << p1
a << p2

Example.say_hello(a.length, a)

TypeError: in method 'say_hello', argument 2 of type 'Person *'

Can anyone tell me how I can configure SWIG such that I can create and pass arrays like this?

--
Thanks!
Bryan

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[zhiyang jiang]

Message: 1
Date: Wed, 7 May 2008 15:39:22 -0600
From: "Bryan Richardson" <btrichardson@...>
Subject: [Swig-user] SWIG and Ruby Arrays
To: swig-user@...
Message-ID:
       <3f81a4240805071439q54cca4abj230ac79aefd8ce82@...>
Content-Type: text/plain; charset="iso-8859-1"

Hello all,

I'm new to SWIG, so please bear with me!  :)  I have a C program that among
other things defines a structure and has a method that accepts an array of
those structures, similar to the following:

/* people.h header file */
typedef struct {
 char* name;
} Person;

void say_hello(Person[] people);

/* source file */
#include <stdio.h>
#include "people.h"

void say_hello(int count, Person* people) {
 int index;
 for (index = 0; index < count; index++) {
   printf("Hello, my name is %s\n", people[index]);
 }
}

I'm using SWIG to wrap this library (in an Example module) so I can call it
from Ruby.  From Ruby, I can create new Person objects and set their names
no problem.  However, when I put them into a Ruby array and then try to send
that array to the say_hello method I get an error:

p1 = Example::Person.new
p1.name = "Bryan"
p2 = Person.new
p2.name = "John"

a = Array.new
a << p1
a << p2

Example.say_hello(a.length, a)

TypeError: in method 'say_hello', argument 2 of type 'Person *'

Can anyone tell me how I can configure SWIG such that I can create and pass
arrays like this?

--
Thanks!
Bryan

%typemap(in) may be useful!!

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