[mapserver-dev] A basic question about mapserver functions

[Paul Ramsey]

Approximately this:

drawMap->drawLayer->drawLayerShape

p

On Sun, Jul 19, 2009 at 11:50 PM, Mauricio Herrera<georazor at gmail.com> wrote:
> Hello
>
> Really I hope you  can help me with next doubt,I appreciate your help...
>
> Well, I am drawing  a function map of mapserver. Because I would like to
> know all internal structure of mapserver. However
> I have a problem with DATA. I don't understand what function links  DATA
> value (layer->data) with next functions:
>
> imageObj *msDrawMap(mapObj *map, int querymap)
> int msShapefileOpen(shapefileObj *shpfile, char *mode, char *filename, int
> log_failures)
>
> (LoadLayer) file mapfile.c  <----- What is the link function for DATA value?
> --------->(msDrawMap) file mapdraw.c
> (LoadLayer) file mapfile.c  <----- What is the link function for DATA value?
> ---------> (msShapefileOpen) file mapshape.c
>
>
> For example:
>
> 1.-loadLayer()-->getString() ---->linkfunction()?------->msDrawMap()
>                                                       |
>                                                 filename=layer->data;
>
> 2.-loadLayer()-->getString() ---->linkfunction()?------->msShapefileOpen()
>                                                       |
>                                                 filename=layer->data;
>
>
> I know that this  imageObj *msDrawMap(mapObj *map, int querymap) function is
> used for rendering the map file. Therefore this function
> must know where the data are located ("/usr/local/geo/street")  and DATA
> provides this information with (layer-> data) ... but where does it? = S I
> can not find the function..
>
>
> And I  know too that:
>
> loadLayer() this function contain  a (case DATA:)  and  this call the
> functions  getString(),msValidateParameter(),msLookupHashTable() and
> msFree()..But In what moment DATA sends or provides its value to the
> functions msDrawMap() o msShapefileOpen? where is the link function?
>
>
> I hope you understand me
>
> Thanks
>
> Mauricio
>
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>