Get the worldedit selection?

I'm sorry of this is the wrong place for this question, but how would I get the current worldedit selection from within my plugin?

Or how to get a cube from 2 points(I'm having a lot of trouble finding any help on either of these, I've been searching all morning, the worldedit would be much easier for me, but I could do with a way to get a cube from 2 points)

 

Code:

WorldEditPlugin we = p.getWorldEdit();
        Selection sel = we.getSelection(player);
        if(sel == null){
            player.sendMessage(ChatColor.RED+"You must make a WorldEdit Selection first");
            return;
        }
        Location max = sel.getMaximumPoint();
        Location min = sel.getMinimumPoint();

 

Okay this has given me a HUGE start, thank you, however I'm not sure how to fix this error properly: p can't be resolved..
Its quickfix is adding this line: WorldEditPlugin p;
However that makes the getSelection(player);
become an error which gives me the quick fix of changing we
to a WorldEdit instead of WorldEditPlugin.. which then makes the getSelection(player);
undefined for the type WorldEdit.. I'm lost



Second, (sorry for all the questions I promise I'm searching everything before I ask here)
How would I go about getting all the blocks in that selection

 

I am currently stuck on this problem too. I know for a fact that 'p' is the variable for the player though.

 

Code:

for(Plugin plugin : pm.getPlugins()){
            if(plugin instanceof WorldEditPlugin){
                p = ((WorldEditPlugin) plugin);
                break;
            }
        }