Ok here are some bizarre results.
When I reduce my script to just a require and a new call, and I reduce the
extension to defining one real method, then I can make it fail depending on
how many other methods I define. In my Init_win32ole2 function, I define n
dummy methods. If I define 35 or below of them, it will get through the new
call. If I define 36 or above of them it will segfault. I found this by
discovering that if I commented out some of the method, class, etc,
definitions in the real Init_win32ole function, then it started to work.
My build environment is Visual C++ 6. The makefile was generated by the
extconf.rb that came with win32ole. I just modified it to use win32ole2
instead.
Does anyone have any ideas what is going wrong here or how I should proceed
further? I feel that I have reduced it down to the bare minimum so there
must be something simple that is not being done for 1.8. This test works in
1.6 with values as high as 1000.
Thanks,
Steve Tuckner
From: ts [mailto:decoux@moulon.inra.fr]
Sent: Wednesday, October 29, 2003 5:35 AM
To: ruby-talk ML
Cc: ruby-talk@ruby-lang.org
Subject: Re: Win32OLE again
Please anyone who has written C extensions or the author
of Win32OLE,
let me know what is wrong with calling free on pointers
allocated with
ALLOC_N.
Well there is nothing wrong with calling free with ALLOC_N
because like
you’ve found ALLOC_N is just a call to malloc().
But if it exist an error in the C extensions (bad memory management
elsewhere) then the memory pool can be corrupted and this
can explain
the crash.
Perhaps the error is in the extension Win32OLE (well, I
don’t know what
do this extension and I’ve not looked at the source)
Guy Decoux
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###=0A=
win32ole2.obj : $(hdrdir)/ruby.h $(hdrdir)/config.h =
$(hdrdir)/defines.h=0A=
#include “ruby.h”
static VALUE
fev_s_new(argc, argv, klass)
int argc;
VALUE *argv;
VALUE klass;
{
char *pstr;
printf(“In WIN32OLE_EVENT.new\n”);
pstr = ALLOC_N(char, 11);
printf("pstr = %8.8lx\n", pstr);
printf("In WIN32OLE_EVENT.new 1\n");
free(pstr);
printf("In WIN32OLE_EVENT.new 2\n");
}
static VALUE dummy_method(VALUE self)
{
}
VALUE cWIN32OLE_EVENT;
void
Init_win32ole2()
{
int i;
char s[100];
cWIN32OLE_EVENT = rb_define_class("WIN32OLE_EVENT", rb_cObject);
for (i = 0; i < 35; i++) {
sprintf(s, "default%d", i);
rb_define_method(cWIN32OLE_EVENT, s, dummy_method, 0);
}
rb_define_singleton_method(cWIN32OLE_EVENT, "new", fev_s_new, -1);
}
EXPORTS=0A=
Init_win32ole2=0A=
require “win32ole2”
ev = WIN32OLE_EVENT.new()
···
-----Original Message-----
(I am smiling widely).