[mapserver-users] inconsistent PHP/Mapscript non-object error

[Mark Giesbrecht]

Hi All,

My setup:
IIS 5.0
PHP 4.06 as cgi
PHP/Mapscript

I've come across the wierdest of problems with a php script on two
different IIS 5.0 machines.  In my script, with no parameters passed, it
displays a simple map.  I then flag labels on, zoom to different
extents, and the map still displays (on both machines).  The problem
lies with one machine, where I try to turn specific layers on with a php
isset/switch combination, the script bails with an error with:

Call to a member function on a non-object in
C:\MYWEB\newsite\gedcomap\mapscript\postmap.php on line 164

My line 164 is:

$img->saveImage('',MS_GIF, 1, 1, 75);

Now, it is obvious in the error that the $img object no longer exists,
but for the life of me can't explain why it works on one machine, and
not the other.

Any thoughts, ideas?

<?php
header("Content-type: image/gif");
 // Load MapScript module.

 dl("php_mapscript_35.dll");

 //
 // Load MapServer .map file
 //
 $map = ms_newMapObj("../locationsprj.map");

 //Determine zoom extents
 if (isset($zoom))
 {

  switch ($zoom)
  {
   case "ALL": //World extents
    $map->setextent( -20000000.000, -8449750.000, 19900000.000,
16451325.000);
    break;

   case "WCANADA":
    $map->setextent( -15604189.866491, 5728697.158015,-10734609.241998,
10005187.834654);
    break;

   case "ECANADA":
    $map->setextent( -11447573.326271, 3978110.696705, -4032667.8763,
10005187.834654);
    break;

   case "NCANADA":
    $map->setextent( -16519817.840106, 7203994.832244, -1429834.819113,
15456095.305808);
    break;

   case "NAMERICA":
    $map->setextent( -19382823.018345, -188395.722636, -4553012.118403,
12835220.260005);
    break;

   case "SAMERICA":
    $map->setextent( -14217739.307468, -8744055.857217, 612071.592474,
4279560.125423);
    break;

   case "ASIA":
    $map->setextent( 7441033.846743, 356826.088735, 16937316.265127,
8696510.007443);
    break;

   case "EUROPE":
    $map->setextent( -1130748.06457, 4116806.988907, 3292177.993307,
11401043.334607);
    break;

   case "AFRICA":
    $map->setextent( -2407541.653016, -3764271.132892, 7220725.892471,
4691322.801285);
    break;

   case "SEASIA":
    $map->setextent( 10536970.90259, -7490309.75465, 20813769.684129,
1534827.636829);
    break;

   case "MEAST":
    $map->setextent( 3382237.573671, 1250936.253511, 7414905.449971,
5092445.862826);
    break;
   }
  } else {
   //to the whole world
   $map->setextent( -20000000.000, -8449750.000, 19900000.000,
16451325.000);
 }



 if (isset($LABELSON))
 {
  $cntryLayer = $map->getLayerByName("country");

  switch($LABELSON)
  {
   case "true":
    $cntryLayer->set("labelitem", "CNTRY_NAME");
    break;

   case "false":
    $cntryLayer->set("labelitem", "NOLABEL");
    break;
  }
 }

 if (isset($GEDCO))
 {
  $jobLayer = $map->getLayerByName("jobs");
  $jobLayer->set("classitem", "TYPE");

  switch ($GEDCO)
  {
   case "OIL":
    $clsjobLayer = $jobLayer->getClass(0);
    $jobLayer->set("status", "1");
    $clsjobLayer->setexpression(" 'O' ");
    $clsjobLayer->set("color", $map->addcolor(255, 173, 0));
    break;

   case "MINING":
    $clsjobLayer = $jobLayer->getClass(0);
    $jobLayer->set("status", "1");
    $clsjobLayer->setexpression(" 'X' ");
    break;

   //Create a new class object, display both O and X
   case "OIL-MINING":
    $clsjobLayer = $jobLayer->getClass(0);
    $jobLayer->set("status", "1");
    $clsjobLayer->setexpression(" 'X' ");
    //Mining = X; Oil = O;
    $clsMiningLayer = ms_newClassObj($jobLayer);
    $clsMiningLayer->setexpression(" 'O' ");
    $clsMiningLayer->set("color", $map->addcolor(255, 173, 0));
    $clsMiningLayer->set("size", 10);
    $clsMiningLayer->set("symbol", 2);
    $clsMiningLayer->set("name", "");
    $clsMiningLayer->set("outlinecolor", $map->addcolor(128, 128, 128));

    break;

  }
 }

 if (isset($SIS))
 {
  $omniLayer = $map->getLayerByName("sis");
  $omniLayer->set("classitem", "PROG");

  switch ($SIS)
  {
   case "OMNI":
    $omniLayer->set("status", "1");
    $clsomniLayer = $omniLayer->getClass(0);
    $clsomniLayer->setexpression(" 'OMNI' ");
    break;

   case "VISTAWIN":
    $omniLayer->set("status", "1");
    $clsomniLayer = $omniLayer->getClass(0);
    $clsomniLayer->setexpression(" 'VISTAWIN' ");
    $clsomniLayer->set("color", $map->addcolor(128, 0, 128));
    break;

   //Same as above; create a new class object (1), and display both OMNI
and VISTAWIN, with
   //VISTAWIN as a new colour
   case "OMNI-VISTAWIN":
    //Show the regular layer
    $clsomniLayer = $omniLayer->getClass(0);
    $clsomniLayer->setexpression(" 'OMNI' ");
    $omniLayer->set("status", "1");
    //Create new class
    $clsVistaLayer = ms_newClassObj($omniLayer);
    $clsVistaLayer->setexpression(" 'VISTAWIN' ");
    $clsVistaLayer->set("color", $map->addcolor(128, 0, 128));
    $clsVistaLayer->set("size", 10);
    $clsVistaLayer->set("symbol", 2);
    $clsVistaLayer->set("name", "");
    $clsVistaLayer->set("outlinecolor", $map->addcolor(128, 128, 128));

    break;
  }
 }
 //Finalize the output
 $img = $map->draw();
 $img->saveImage('',MS_GIF, 1, 1, 75);
?>
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