Re: [PD] comparing symbols in external
Strange things like this can happen if someone inadvertently writes
a new string into an existing symbol... i.e., never do this:
strcat(sym-s_name, cat).
MAybe there was already a symbol somewhere else whose name is cat and
then you'll have 2 symbols with teh same name but different addresses.
(I've seen people do this, in various ways, before).
cheers
Miller
On Sat, May 03, 2014 at 03:22:19AM -0400, Jaime E Oliver wrote:
Hi all,
I am trying to compare two symbols, one incoming in a list into an external
and the other one stored internally in the external.
It compiles fine, but I don't get a match.
c code is below. Ideas on what I'm missing?
J
void testtext_input(t_testtext *x, t_symbol *selector, int argcount, t_atom
*argvec) {
int i;
const t_symbol *storedsymbol = gensym(mysymbol);
for (i = 0; i argcount; i++) {
if (argvec[i].a_type == A_SYMBOL) {
if ( argvec[i].a_w.w_symbol-s_name == storedsymbol)
post(found match!);
}
}
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Re: [PD] comparing symbols in external
On 05/03/2014 09:22 AM, Jaime E Oliver wrote:
Hi all,
I am trying to compare two symbols, one incoming in a list into an external
and the other one stored internally in the external.
It compiles fine, but I don't get a match.
c code is below. Ideas on what I'm missing
the whole idea about symbols is, that you can do a pointer comparision
of the *symbol*.
so it should be as simple as:
if(argvec[i].a_type == A_SYMBOL argvec[i].a_w.w_symbol ==
storedsymbol) post(found match);
if (argvec[i].a_type == A_SYMBOL) {
if ( argvec[i].a_w.w_symbol-s_name == storedsymbol)
post(found match!);
the -s_name field of the symbol is the pointer to the actual C-string,
whereas storedsymbol is a pointer to the symbol.
so you are doing a compare ((const char*)cstr == (t_symbol*)sym), which
is clearly wrong.
fgmsadr
IOhannes
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Re: [PD] comparing symbols in external
Thanks to both, it makes sense and it works now.
J
On May 3, 2014, at 4:42 AM, IOhannes m zmölnig zmoel...@iem.at wrote:
On 05/03/2014 09:22 AM, Jaime E Oliver wrote:
Hi all,
I am trying to compare two symbols, one incoming in a list into an external
and the other one stored internally in the external.
It compiles fine, but I don't get a match.
c code is below. Ideas on what I'm missing
the whole idea about symbols is, that you can do a pointer comparision
of the *symbol*.
so it should be as simple as:
if(argvec[i].a_type == A_SYMBOL argvec[i].a_w.w_symbol ==
storedsymbol) post(found match);
if (argvec[i].a_type == A_SYMBOL) {
if ( argvec[i].a_w.w_symbol-s_name == storedsymbol)
post(found match!);
the -s_name field of the symbol is the pointer to the actual C-string,
whereas storedsymbol is a pointer to the symbol.
so you are doing a compare ((const char*)cstr == (t_symbol*)sym), which
is clearly wrong.
fgmsadr
IOhannes
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