MATLAB: How to consistently scan for a text file (or any file)

fileMATLAB

So I wanted my app to scan a text file consistently… So that it will update according to what the file has soon as the file is in that specific directory. How is that possible?? Because I have no clue what is the function for that.

Best Answer

"soon as the file is in that specific directory" &nbsp See: Monitor Changes to .TXT File

    Create a FileSystemWatcher object fileObj and watch the Changed event for files 
    with a .txt extension in the folder C:\work\temp.
    fileObj = System.IO.FileSystemWatcher('c:\work\temp');
    fileObj.Filter = '*.txt';
    fileObj.EnableRaisingEvents = true;
    addlistener(fileObj,'Changed',@eventhandlerChanged);

"scan a text file consistently" &nbsp what exactly do you want to do. Read the file and search for specific content?

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MATLAB: How to remove certain lines of text in a text file

DataS = fileread('SAMPLEFILE.txt');
% Perhaps you have to fix the linebreaks:
DataS = strrep(DataS, char([13,10]), char(10));
Data  = regexp(DataS, char(10), 'split');
PatternS = fileread('NewGalaxy.txt');
PatternS = strrep(PatternS , char([13,10]), char(10));
Pattern  = regexp(PatternS , char(10), 'split');
Match = setdiff(Data, Pattern);
% Do you want to create a new file?
fid = fopen('NewFile.txt', 'w');
if fid < 0; error('Cannot open file.'); end
fprintf(fid, '%s\n', Match{:});
fclose(fid);

MATLAB: File Watcher for continuous running program

the post that you linked to is using this functionality in a figure, so the callbacks are used as long as the figure is running. The mention of the infinite loop in that post refers to making your script run continuously, not recreating the fileObj repeatedly. In order to do this, remove the while loop and move to after the final addlistener. This will leave the fileObj as it was created, but continue listening as long as the loop is running.

For example:

 function continual_process()
 path_to_watch = 'C:\Users\3cal-shape\Desktop\test';
 fileObj = System.IO.FileSystemWatcher(path_to_watch);
 fileObj.Filter = '*.slm';
 fileObj.EnableRaisingEvents = true;
 addlistener(fileObj,'Created', @eventhandlerChanged);
 addlistener(fileObj,'Changed', @eventhandlerChanged);
 i=0;
 while i<1000000
    i = i+1;
    pause(0.001);
 end
 end
 function eventhandlerChanged(source,arg)
 disp(source)
 disp('found new file')
 end

Best Answer

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MATLAB: How to remove certain lines of text in a text file

MATLAB: File Watcher for continuous running program

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