React on query error

[Lowell.Filak]

Stefan Schwarzer writes: 

> Hi, 
> 
> my application offers the possibility to preselect countries that  should 
> be displayed on the map. Thus, instead of having all  countries, I get 
> only these preselected ones mapped; the others are  grayed out. But if a 
> user now uses the query tool and clicks on one  of those not-preselected 
> countries, than an mapscript error occurs  (naturally). Is there a way to 
> react on such an error warning and  continue at another point, so that 
> this "problem" is just ignored and  the application can continue to work? 
> 
> 		if (!$imgbox)
> 			$map -> queryByPoint($click_pt, MS_MULTIPLE, -1); // here is then  the 
> error
> 		else
> 			$map -> queryByRect($click_rt); 
> 
> "Warning: [MapServer Error]: msQueryByPoint(): No matching record(s)  
> found. in /www/geodataportal/htdocs/mod_map/etc/php/query.php on line  42" 
> 
> Thanks for any help! 
> 
> 

Stefan, 

Being that is just a warning message you should be able to set a variable to 
the result of the queryByPoint and then test for MS_SUCCESS or MS_FAILURE 
and react accordingly. 

Lowell