adding a fresh .NET assembly gives a warning : Warning: Assembly xxx has already been added from location

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Doctor G
Doctor G 2017-10-23
编辑： KAE 2022-4-18
I have a very simple .m class, that has a method called setup that adds a .NET assembly, But I get a warning that the assembly is already added.
Well, there was no Matlab running. I launched a fresh copy. Setup is only called once. The line (#18) that adds the assembly (according to the debugger) is only called once. In fact, I checked to see if the assembly was added before the setup, and it returned false, i.e. that the assembly was not found.
So what gives?
(I know, this is only a warning, and the code still works, but this is frustrating).
classdef liveFeed < handle
%eFeed Recieves live entities values (PDU data) from VR-Link
% DIS PDU's are captured by the C# feeder.dll from the UDP
% bus and translated by VR-Link code to Entity objects
% user should subscribe the the entities they want and will get
% them as messages
properties
asm
feed
result
end
methods
function this = liveFeed
end
function setup(this)
this.asm = NET.addAssembly(fullfile(fileparts(mfilename('fullpath')), '..\bin\MatLink.dll'));
this.feed = linkware.Feeder('me');
addlistener(this.feed,'NextEntity',@this.processEntry);
end
function classView(this)
methodsview(this.feed);
end
function fire(this)
this.feed.fire();
end
function processEntry(this, ~, entry)
this.result = char(entry.name);
disp(this.result);
end
function classList(this)
disp(this.asm.Classes);
end
end
end
>> l = liveFeed
l =
liveFeed with properties:
asm: []
feed: []
result: []
>> isempty(which('linkware.Feeder'))
ans =
logical
1
>> l.setup
18 this.asm = NET.addAssembly(fullfile(fileparts(mfilename('fullpath')), '..\bin\MatLink.dll'));
Warning: Assembly 'D:\CERDEC\LinkWare\bin\MatLink.dll' has already been added from location
'MatLink'.
> In liveFeed/setup (line 18)
>> isempty(which('linkware.Feeder'))
ans =
logical
0
  1 个评论
Doctor G
Doctor G 2017-10-24
编辑：Doctor G 2017-10-24
if true
% code
endIs there some hidden thing in
fullfile(fileparts(mfilename('fullpath'))
that might cause the code to execute twice? since if I just hard code the path, it seems not to give this problem?

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采纳的回答

Guillaume
Guillaume 2017-10-24
I'm not really sure why your code is not working properly. However, since asm is supposed to be a singleton, defining it as a constant property would ensure that it is only evaluated once, when the class is loaded:
classdef liveFeed < handle
%eFeed Recieves live entities values (PDU data) from VR-Link
% DIS PDU's are captured by the C# feeder.dll from the UDP
% bus and translated by VR-Link code to Entity objects
% user should subscribe the the entities they want and will get
% them as messages
properties (Constant)
asm = NET.addAssembly(fullfile(fileparts(mfilename('fullpath')), '..\bin\MatLink.dll'));
end
properties
feed
result
end
The rest of your setup function can then go into the class constructor.

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