On 05/19/2013 11:47 PM, J Oliver wrote:

Hello all,

I need to create a textfile from inside an external and I need to give the computer a path with a message like:

path /home/path/file.txt

I am therefore creating a method for path with:

class_addmethod(testtext_class, (t_method)testtext_path, gensym("path"), A_GIMME, 0);

Or should I use A_DEFSYMBOL ?

I'd use A_DEFSYMBOL if you want the user to be able to send a "path" message with no args,
and A_SYMBOL if you want to require them to specify some path.

But then how can I read the atom inside the external?

I am using:

void testtext_path(t_testtext *x, t_atom *s){

char teststring[1000];

atom_string(s, teststring, 1000);

post(teststring);

}

but then I get the following printout:

consistency check failed: atom_string

333333@ÿÿÿÿs

I'm not sure where to move with this. anybody has any suggestions?

I don't have time to check it but I'd imagine the problem is that A_GIMME assumes the method wants the following args: t_testtext*, t_symbol*, int, and a t_atom*

where the t_symbol* refers to the selector that was used to call the method-- in this case, the word "path". (That can come in handy, btw, as you can have methods "chocolate" and "vanilla" point to the same foo_icecream function and branch based on which selector was used.)

However, you only specified two arguments for that method, and one of them is t_atom* so I guess it implicitly casts from the t_symbol* it receives. (I think the compiler warns you about stuff like this but I'm no expert so maybe I'm wrong.)

Then inside atom_string (in m_atom.c) it switches based on a->a_type, but your "a" doesn't have an a_type because it's really a t_symbol*. Thus none of the cases match and so the function ends up calling the "bug" function that prints out the error you see.

Essentially you tried to build a string using a reference to an atom that's not really an atom, so Pd complained that you weren't being consistent.

-Jonathan

best,

J

Here's the info for atom_string:
atom_string
void atom_string(t_atom *a, char *buf, unsigned int bufsize);
Converts an atom a into a C-string buf. The memory to this char-Buffer has to be reserved manually and its length has to be declared in bufsize.
in: http://pdstatic.iem.at/externals-HOWTO/node9.html#SECTION00092200000000000000
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