MATLAB Programming Fundamentals - MathWorks

c = onCleanup(@()fclose(fid));

s = fread(fid);

.

.

.

end

Example 2 — Maintain the Selected Folder

This example preserves the current folder whether functionThatMayError returns an

error or not:

function changeFolderSafely(fileName)

currentFolder = pwd;

c = onCleanup(@()cd(currentFolder));

functionThatMayError;

end % c executes cd(currentFolder) here.

Example 3 — Close Figure and Restore MATLAB Path

This example extends the MATLAB path to include files in the toolbox\images folders, and

then displays a figure from one of these folders. After the figure displays, the cleanup

routine restore_env closes the figure and restores the path to its original state.

function showImageOutsidePath(imageFile)

fig1 = figure;

imgpath = genpath([matlabroot '\toolbox\images']);

% Define the cleanup routine.

cleanupObj = onCleanup(@()restore_env(fig1, imgpath));

% Modify the path to gain access to the image file,

% and display the image.

addpath(imgpath);

rgb = imread(imageFile);

fprintf('\n Opening the figure %s\n', imageFile);

image(rgb);

pause(2);

% This is the cleanup routine.

function restore_env(fighandle, newpath)

disp ' Closing the figure'

close(fighandle);

26 Error Handling