“Shashank Date” sdate@everestkc.net wrote in message
I am still trying to figure out how to convert it into
a fully working C program (like all the other code examples).
Sorry… I couldn’t think of any good cutnpaste-example when I
wrote the text about rb_class_new_instance(). If anyone has ideas for
better examples they are welcome.
To be more specific, I am on WIN XP Pro, using VC++ 6.0
The following code does not work (it crashes and asks me if I
want to send the error report to Microsoft. Probably because I
do not know how “… to tell the Ruby’s garbage collector that
there is a new instance in town” )
There is 2 ways you can inform GC about the new instance.
#1 rb_define_variable(name, instance);
by naming the instance, so it can be accessed by its
Ruby-variable-name. Use this if you want to share an
instance between Ruby and you extension/embedding code.
#2 rb_gc_register_address(&instance);
don’t want to assign a name to the instance.
Use this if you want to keep some variables private to
your extension/embedding code.
It cannot be accessed from a ruby-script.
I have tested all the other programs and they all work fine so I don’t
think there is a problem with setting up my VisualStudio 6.0 environment.
OK… nice to know. I was worried that it wouldn’t work on windows.
Perhaps you can add a short guide to rubygarden about how you have
setup’ed compilation on windows ?
//-------------------------------------------------------------------
#include <ruby.h>
int main(int Argc, char **Argv) {
int argc;
VALUE argv[2];
VALUE class;
VALUE instance;
ruby_init();
argv[0] = INT2FIX(42);
argv[1] = rb_str_new2(“hello world”);
argc = 2;
/* ----- This does not work either:
class = rb_path2class(“TestClass”);
instance = rb_class_new_instance(argc, argv, class);
*/
class = rb_const_get(rb_cObject, rb_intern(“TestClass”));
^^^^^^^^^
‘TestClass’ does not exist… Try with a class-name which exists, perhaps:
String, Array, …
Besides that you code looks ok 
instance = rb_funcall2(class, rb_intern(“new”), argc, argv);
ruby_finalize();
return 0;
}
//-------------------------------------------------------------------
#include <ruby.h>
int main(int argc, char *argv) {
int n;
VALUE args[2];
VALUE klass;
VALUE instance;
ruby_init();
args[0] = INT2FIX(4);
args[1] = rb_str_new2("ok");
n = 2;
klass = rb_path2class("Array");
instance = rb_class_new_instance(n, args, klass);
/* tell GC that there is a new instance in town. */
rb_gc_register_address(&instance);
rb_p(instance);
ruby_finalize();
return 0;
}
./a.out
[“ok”, “ok”, “ok”, “ok”]
···
On Mon, 23 Jun 2003 21:44:52 +0000, Shashank Date wrote:
–
Simon Strandgaard
