Re: python bindings GInitiallyUnowned issue

[Patrick Salecker <patty9999 gmx de>]

Am 28.07.2010 22:08, schrieb Ranen Ghosh:
> Hello, I find that calling ChamplainView object's set_map_source() 
> with the result of champlain.file_cache_new_full() in python leads to 
> errors..
>
>         self.tilecache = champlain.file_cache_new_full( 1,
>                                      '/home/rghosh/shared/test/jepp_osm',
>                                      True )
>
>         print "ref count 1", sys.getrefcount(self.tilecache)
>         sys.stdout.flush()
>         view.set_map_source( self.tilecache )
>         print "ref count 2", sys.getrefcount(self.tilecache)
>
> output:
>
> ref count 1 2
>
> ** (cluttertest.py:25857): CRITICAL **: get_min_zoom_level: assertion 
> `CHAMPLAIN_IS_MAP_SOURCE (next_source)' failed
>
> ** (cluttertest.py:25857): CRITICAL **: get_max_zoom_level: assertion 
> `CHAMPLAIN_IS_MAP_SOURCE (next_source)' failed
>
> ** (cluttertest.py:25857): CRITICAL **: get_license: assertion 
> `CHAMPLAIN_IS_MAP_SOURCE (next_source)' failed
>
> ** (cluttertest.py:25857): CRITICAL **: get_tile_size: assertion 
> `CHAMPLAIN_IS_MAP_SOURCE (next_source)' failed
>
> ** (cluttertest.py:25857): CRITICAL **: get_tile_size: assertion 
> `CHAMPLAIN_IS_MAP_SOURCE (next_source)' failed
>
> ** (cluttertest.py:25857): CRITICAL **: get_tile_size: assertion 
> `CHAMPLAIN_IS_MAP_SOURCE (next_source)' failed
> ref count 2 2
>
> I wonder if it's due to reference count issues in the python bindings, 
> since ChamplainFileCache inherits from GInitiallyUnowned ?
>
> Ranen
Hi,
you should add the file_cache to a champlain.MapSourceChain(), that 
works fine for me.

Example:
        self.source = self.map_source_factory.create("memphis-local")

        tile_size = self.source.get_tile_size()
        error_tile_source = champlain.error_tile_source_new_full(tile_size)

        file_cache = champlain.file_cache_new_full(size, 
file_cache_path, True)

        source_chain = champlain.MapSourceChain()
        source_chain.push(error_tile_source)
        source_chain.push(self.source)
        source_chain.push(file_cache)
        self.view.set_map_source(source_chain)