Try this:
promptMessage = sprintf('Select your text file on the next dialog box.');
titleBarCaption = 'Continue?';
buttonText = questdlg(promptMessage, titleBarCaption, 'OK', 'Cancel', 'OK');
if contains(buttonText, 'Cancel', 'IgnoreCase', true)
return;
end
% Have user browse for a file, from a specified "starting folder."
% For convenience in browsing, set a starting folder from which to browse.
startingFolder = pwd; % or 'C:\wherever';
if ~isfolder(startingFolder)
% If that folder doesn't exist, just start in the current folder.
startingFolder = pwd;
end
% Get the name of the file that the user wants to use.
defaultFileName = fullfile(startingFolder, '*.txt');
[baseFileName, folder] = uigetfile(defaultFileName, 'Select a file');
if baseFileName == 0
% User clicked the Cancel button.
return;
end
fullFileName = fullfile(folder, baseFileName)
% Open the file for reading in text mode.
fileID = fopen(fullFileName, 'rt');
% Read the first line of the file.
textLine = fgetl(fileID);
lineCounter = 1;
while ischar(textLine)
userPrompt = sprintf('%s (type only Enter to quit now): ', strtrim(textLine));
userResponse = input(userPrompt, 's');
% Bail out if they just typed Enter.
if isempty(userResponse)
break;
end
% Print out user's response.
fprintf('You entered %s.\n', userResponse);
% Read the next line.
textLine = fgetl(fileID);
lineCounter = lineCounter + 1;
end
% All done reading all lines, so close the file.
fclose(fileID);
