[Mapserver-users] help with python mapscript (no image)

[Christoph Spoerri]

Hi Sean,

thanks for your help. The code and comments you sent were very usefull. I had 
to changed the code a bit to make it work, but I saw that you had to save the 
map image explicit to a file (w/ name) set the URL appropriately. With the 
PHP mapscript this is done for you.

Thanks for your help! 
Christoph

BTW. is there an advantage to using join() than using '+' to append strings?

On Tuesday 30 December 2003 12:38 pm, Sean Gillies wrote:
> Hi Cristoph,
>
> Are you using 4.0.1?  If not, I strongly recommend that you download
> and build MapServer 4.0.1.
>
> I'll try to explain the right way to do this with a little script:
>
>      # I'm pretty sure that import * is safe, but not 100% sure
>      from mapscript import mapObj
>      import os
>
> 	# Create map instance
>      myMap = mapObj('/var/www/htdocs/mapserver/obis_test/testing.map')
>
>      # Draw map.  The resulting image acquires 'imagepath' and
>      # 'imageurl' attributes from myMap and also acquires a 'format'
>      # that is the same as the selected format of myMap, in this
>      # case the built-in 'PNG24' format as defined in your map file
>      mapImg = myMap.draw()
>
>      # Save image to the imageurl location using a filename formed
>      # from the map name and the output format extension, result
>      # in your case will be 'PYDEMO.png'
>      imagename = '.'.join((myMap.name, mapImg.format.extension))
>      mapImg.save(os.path.join(mapImg.imageurl, imagename))
>
> The IMAGEURL is a directory name.  It's not really required for a
> Python MapScript app like it is with the mapserv CGI, but it remains
> useful.
>
> Hope this helps, cheers,
> Sean
>
> On Tuesday, December 30, 2003, at 09:55  AM, Christoph Spoerri wrote:
> > Hi there,
> >
> > After using the php mapscripts for over a year now, I started to look
> > into the
> > python mapscripts. It seems to provide more functionality and doesn't
> > have to
> > have to be run as cgi (I'm using mod_python).
> >
> > The compilation, installation and setup went pretty smoothly. Now, I
> > would
> > like to create my first map, but for some reason I do not get an image
> > in my
> > output directory. I can create an image of the map by saving the image
> > (imgObj::saveImage() ), but the mapObje::draw() doesn't seem to work.
> >
> > I run also the following from the python prompt:
> >>>> from mapscript import *
> >>>> myMap = mapObj('/var/www/htdocs/mapserver/obis_test/testing.map')
> >>>> mapImg = myMap.draw()
> >>>> mapImg.imageurl
> >
> > '/output/'
> >
> >>>> mapImg.save('/tmp/test.png')
> >
> > As you can see the imageurl only points to the directory where the
> > image
> > should be and doesn't include the image name.
> >
> > I spent the last 4 hours search the mailing list, google, etc, yet
> > wasn't able
> > to find a solution. Any ideas? I have attached my map file.
> >
> > thanks, and a happy new year
> >
> > Christoph
> >
> > ************** my map file ************************
> >
> > MAP
> > 	NAME PYDEMO
> > 	EXTENT -180 -90 180 90
> > 	SIZE 400 300
> > 	SHAPEPATH "/usr/local/ims_data/"
> >
> > 	UNITS DD
> > 	RESOLUTION 72
> > 	IMAGETYPE PNG24
> > 	IMAGECOLOR 245 245 245
> > 	WEB
> > 		IMAGEPATH "/var/www/htdocs/ims_output/"
> > 		IMAGEURL "/output/"
> > 	END
> >
> > 	LAYER
> > 		NAME "Background"
> > 		STATUS DEFAULT
> > 		DATA "datalib/global/ocean_log.tif"
> > 		TYPE RASTER
> > 		OFFSITE 0 0 0
> > 	END
> >
> > 	LAYER
> > 		NAME "Continents"
> > 		STATUS DEFAULT
> > 		DATA "datalib/global/world_usa_canada"
> > 		TYPE POLYGON
> > 		TRANSPARENCY 0
> > 		CLASS
> > 			COLOR 180 210 170
> > 			OUTLINECOLOR 150 190 140
> > 		END
> > 	END
> > END
>
> --
> Sean Gillies
> sgillies at frii dot com
> http://users.frii.com/sgillies