importing files automatically callback function error

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AA 2014-12-10
回答： Sean de Wolski 2014-12-10
function importfcn
% wait an extra second to ensure that the file modification is complete
pause(1.0);
% read the data from file
fileToRead = fullfile('C:\Users\wolfgang\Desktop\file1.csv');
circa = xlsread(fileToRead);
kevin=0.5*(circa(:,4)+circa(:,5)).'
assignin('base','kevin',kevin)
% do something with the data
end
fsw = System.IO.FileSystemWatcher();
fsw.Path = 'C:\Users\wolfgang\Desktop';
fsw.Filter = 'file.csv';
fsw.EnableRaisingEvents = true;
listenerhandle = addlistener(fsw, 'Changed', @importfcn);
%signature of importfcn is function importfcn(sender, eventargs)
%add a small delay in importfcn before reading the file as the event is raised
%to make sure that file modification is complete
Then I get the following error: Warning: Error occurred while executing callback: Error using importfcn Too many input arguments.
Warning: Error occurred while executing callback: Error using importfcn Too many input arguments.
When I type in importfcn then everything is ok and the file gets imported as variable kevin.

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采纳的回答

Sean de Wolski
Sean de Wolski 2014-12-10
addlistener automatically passes along two inputs, source and eventdata.
You can either have your function ignore these or ignore them in the call to addlistener
@(~,~)importfcn
The two ~s deny both inputs and then call importfcn as is.

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