mapscript - queryByAttributes: Aborted

[Jachym Cepicky]

Ok, I get this error no more. Anyway, it does not work, how I would
expect:

    my $layerObj = $mapObj->getLayerByName("landuse"); 
    $layerObj->queryByAttributes($mapObj, 'number', '10850', $mapscript::MS_SINGLE);
    my $resultCacheObj = $layerObj->getResults();
    

    # but there is no $resultCacheObj defined

    print $resultCacheObj,"\n";
    # Use of uninitialized value in print at ./mapserv2.pl line 70.


How to perform the attribute query with mapscript?

Thanks

Jachym


On Sat, Oct 08, 2005 at 02:05:09PM +0200, Jachym Cepicky wrote:
> Hi,
> 
> I work with perl-mapscript, after line with
> 
> [...]
>     $layerObj->queryByAttributes($mapObj, "n_leg", "2240",$mapscript::MS_SINGLE);
> [...]
>     
> I get only
> 
> $ ./mapscript.pl
> *** glibc detected *** double free or corruption (!prev): 0x083eb1a8 ***
> Aborted
> $
> 
> I would like to write application, which would enable to find map
> objects defined by attribut in database table, I suppose,
> queryByAttribute is the method, I'm looking for.
> 
> I thing, I will have to do it like follows:
> 
> 1) set up map extent to fulll extent
> 2) create layerObj
> 3) $layerObj->queryByAttributes($mapObj, "column name", "value",$mapscript::MS_SINGLE);
> 4) $resultCacheObj = $layerObj->getResults();
> 5) new EXTENT = $resultCacheObj->{0}->{bounds};
> 
> is there some better way, how to do this?
> how does exactly drawQuery work -- are there any exaples?
> 
> I'm following the documentation from
> http://zcologia.com/mapserver/mapscript, is there some better place,
> where to look?
> 
> Thank you 
> 
> Jachym
>     
> -- 
> Jachym Cepicky
> e-mail: jachym.cepicky at centrum.cz
> URL: http://les-ejk.cz
> GPG: http://les-ejk.cz/gnupg_public_key/
> -----------------------------------------
> OFFICE:
> Department of Geoinformation Technologies
> LDF MZLU v Brně
> Zemědělská 3
> 613 00 Brno
> e-mail: xcepicky at node.mendelu.cz
> URL:    http://mapserver.mendelu.cz
> Tel.:   +420 545 134 514

-- 
Jachym Cepicky
e-mail: jachym.cepicky at centrum.cz
URL: http://les-ejk.cz
GPG: http://les-ejk.cz/gnupg_public_key/
-----------------------------------------
OFFICE:
Department of Geoinformation Technologies
LDF MZLU v Brně
Zemědělská 3
613 00 Brno
e-mail: xcepicky at node.mendelu.cz
URL:    http://mapserver.mendelu.cz
Tel.:   +420 545 134 514