5 Jan
2015
5 Jan
'15
2:44 p.m.
Hello,
$var(...) cannot be deleted. Its implementation relies on startup
replacement of the name with a pointer in memory, at runtime being used
only the pointer (for speed considerations). You should use $avp() if
you want to deal with $null.
For the second, it depends on transformation, afaik, most
transformations don't return null, but empty string (at least the string
transformations). If you implement a new one and want to return $null,
the value must have the flag PV_VAL_NULL set, like: val->flags |=
PV_VAL_NULL
Cheers,
Daniel
On 05/01/15 13:36, Luis Azedo wrote:
HI Daniel,
thanks, so in the first case instead of assigning the value to the
$var(x) can i delete the $var(x) so that comparison works ?
in the second case (returned value from transform) what value should i
compare against to check if returned value was null ?
------------------------------------------------------------------------
*From:* sr-dev [sr-dev-bounces(a)lists.sip-router.org] on behalf of
Daniel-Constantin Mierla [miconda(a)gmail.com]
*Sent:* Monday, January 05, 2015 3:51 AM
*To:* Kamailio (SER) - Development Mailing List
*Subject:* Re: [sr-dev] need help understanding $null
Hello,
$var(...) cannot be null by design, setting it to $null makes it 0.
$null is more for variables that don't exist, e.g., you don't have the
$avp(x), then it is null if you compare it.
Cheers,
Daniel
On 04/01/15 12:35, Luis Azedo wrote:
--
Daniel-Constantin Mierla
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Hi Daniel,
can you help on this ?
Thank you
------------------------------------------------------------------------
*From:* sr-dev [sr-dev-bounces(a)lists.sip-router.org] on behalf of
Luis Azedo [luis(a)2600hz.com]
*Sent:* Wednesday, December 31, 2014 4:19 AM
*To:* sr-dev(a)lists.sip-router.org
*Subject:* [sr-dev] need help understanding $null
Hi,
if we return val.flags = PV_VAL_NULL, does the == $null comparison work ?
script example
my_function("some param","$var(result)");
if( $var(result) == $null {
do something
}
in code => dst_pv->setf(msg, &dst_pv->pvp, (int)EQ_T, &dst_val);
should the comparison work if we set dst_val.flags = PV_VAL_NULL ?
if( $(myPvar{my.mytransform,transformParameter}) == $null) {
....
}
should this work if the transform returns val.flags = PV_VAL_NULL ?
thank you
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--
Daniel-Constantin Mierla
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda