[PD] outlet_float crashes on windows

[Miller Puckette]

The code looks good - unfortunately, in these cases I'm usually suspicious that
somewhere else in the code something is causing memory corruption.  If you
can get to a linux machine you can try the wonderful 'valgrind' program that
is very god for tracking down bad memory references in C code.

cheers
Miller
On Fri, Aug 23, 2013 at 12:24:14PM +0200, Orm Finnendahl wrote:
> Hi,
> 
>  trying to compile an external for Windows XP I get a very strange
> error: pd crashes when calling outlet_float on an external outlet
> (even if it isn't connected). The very same code runs well on both OSX
> and Linux (same pd version, but has been running there for several
> years). Bypassing the outlet_floats by sending to dedicated receivers
> in the patch makes everything work as expected without any problems
> (which makes it even stranger as it is a pretty involved external with
> internal dynamic loading and connection of abstractions communicating
> with internal in- and outlets with proxies using outlet_float and such
> internally without any issues).
> 
> This is my first attempt with supporting Windows and my setup might be
> screwed up, so I thought I'd ask on the list whether someone has an
> idea how to further investigate into the problem. I'm compiling on a
> virtual machine with XP and latest MinGW. I'm linking against a pd.dll
> of pd-0.43-44 using all header files from that version as well. The
> test is done with a pd of the same version.
> 
> Unfortunately I don't know anything about getting a debugger to work
> on Windows. (I remember it was already painful to get it working with
> inspection and breakpoints on my linux machine).
> 
> Below are the relevant code snippets of the external.
> 
> Any ideas?
> 
> --
> Orm
> 
> --------------------------------------------------------------
> code snippets:
> 
> # typedef:
> 
> typedef struct _quograph
> {
>   t_object x_ob;
>   t_outlet *x_o0;
>   t_float x_currtime;
> ...
> } t_quograph;
> 
> # instantiation/binding:
> 
> static void *quograph_new(t_symbol *s)
> {
> ...
>     x->x_o0 = outlet_new(&x->x_ob, &s_list);
> ...
> }
> 
> # calling example:
> 
> outlet_float(x->x_o0, x->x_currtime);
> 
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