[Mapserver-users] Does anyone success add point persistent to shape?

[Eric Bridger]

There is a difference between a LAYER and a shapefile. Typically the
DATA member of a LAYER is a shapefile name. This is probably the default
case.  But a new layer "$newLyr = new_msLayerObj(" has no DATA member
set yet, so the $newLyr->open() will fail.

What you want is a shape file object. See
http://mapserver.gis.umn.edu/doc/phpmapscript-class-guide.html#shapefileObj
and use the $shapefile->add() method. Call $shapefile->free() to save
the file and then you can draw the layer if it's DATA member points to
the shapefile you just saved. So I guess you want:

LAYER
  NAME "test_point"
  DATA "myshapefile"

$layer = $mapObj->getLayerByName("test_point");
$shapefile = ms_newShapefileObj($layer->{data}, $MS_SHAPE_POINT);

... add your point or shape.

$shapefile->free();

$layer->draw($imgObj);

(you might have to do another getLayerByName() to reload the layer, but
probalby not.)

On Mon, 2004-06-07 at 14:46, Dave McCann wrote:
> We are looking for a similar function to write point/polygon data that a
> user plots on a map. Have you been successful in finding the answer?
> 
> Anyone else out there know of an answer?
> 
> Thanks,
> 
> Dave
> 
> -----Original Message-----
> From: mapserver-users-admin at lists.gis.umn.edu
> [mailto:mapserver-users-admin at lists.gis.umn.edu] On Behalf Of No dream more
> Sent: Friday, June 04, 2004 12:05 AM
> To: Mapserver-users at lists.gis.umn.edu
> Subject: [Mapserver-users] Does anyone success add point persistent to
> shape?
> 
> 
> Dear list,
> 
> I am customizing the interface from mapserver workshop to implementing a
> function to add point to map. But I got some problem:
> - If I create a new layer then I open layer for adding a point. The error
> always is "msSHPOpenFile(): No (NULL) filename provided".
>     $newLyr = new_msLayerObj($mapObj);
>     if($newLyr->open()==MS_SUCCESS){    ////// -> msSHPOpenFile(): No (NULL)
> filename provided
>     }
> 
> - I can add a point to existing layer but I can add only one point. This
> point cannot be save to shape file.
> 
>      //$newLyr = new_msLayerObj($mapObj);
>     $newLyr = $mapObj->getLayerByName("test_point");
> 
>     $newPoint = ms_newPointObj();
>     $newPoint->setXY($x, $y);
> 
>     $newLine = ms_newLineObj();
>     $newLine.add($newPoint);
> 
>     $newShp = ms_newShapeObj(MS_SHAPE_POINT);
>     $newShp->add($newLine);
> 
>     $imgObj = $mapObj->draw();                     (If this call, the point
> can draw)
>     //$imgObj = $mapObj->prepareImage();        (If this call, I got only a
> blank screen)
> 
>     $newLyr->draw($imgObj);
>     $imgObj->saveImage("");
> 
> Does anyone success add point persistent to shape?
> 
> Thank.
> 
> Le Ngoc Lam
> 
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