Pass newly created object's function to a timer object
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I created a class which reads a file as soon as an object is created. In order to display the progress of reading process, I created a public function (which I prefered to be private by the way). Let's call this function writeProgress,
However, after starting the timer, I receive an warning message:
"feval: Undefined function or method 'obj.writeProgress' for input arguments of type 'timer'".
The timer has been initialized like this:
t = timer('TimerFcn',@obj.writeProgress,'Period',1,'ExecutionMode','fixedDelay');
How can I pass the function "writeProgress"? Write progress needs to be a class member as it has to access private data and I'd rather prefer it to be private itself.
采纳的回答
Sean de Wolski
2012-7-30
Here is a class that does what you want from the description above. The only difference is that I placed the call to writeProgeress inside of an anonymous function.
What else is different with it from your class?
classdef WP < handle
properties
x
y
end
methods
function obj = WP(varargin)
obj.x = pi;
obj.y = 'hello world';
t = timer('TimerFcn',@(src,evt)obj.writeProgress,'Period',1,'ExecutionMode','fixedDelay');
start(t)
end
end
methods (Access=private)
function writeProgress(obj)
disp(obj.x);
disp(obj.y);
end
end
end
3 个评论
Vincent
2012-7-30
Sean de Wolski
2012-7-30
编辑：Sean de Wolski
2012-7-30
Most callbacks automatically receive two inputs: the source of the callback and some event data. These need to be accounted for. In the above, I accounted for them with the anonymous function and then threw them away because we didn't need them.
Vincent
2012-7-30
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