uigetfile canceled returns 0, converting my string to a scalar

2 次查看（过去 30 天）
Alessandro Livi
Alessandro Livi 2024-7-7
评论： Walter Roberson 2024-7-7
when I call [infile, location] = uigetfile() and it's canceled, it returns 0s, converting my strings to a scalars
Next time I call it I get an error:
Error using uigetputfile_helper/checkString
Filename must be a character vector or a string scalar.
How do I get my string back for infile to be properly used next time?
This shouldn't be that hard! I even tried converting the vars back to strings but it still fails after a cancel loop
function LoadfromTextFileButtonPushed(app, event)
% Open the file in the Load trials text
if isempty(app.loc)
[infile, app.loc] = uigetfile('*.txt','Select a Stimulus File',app.defLoc);
else
[infile, app.loc] = uigetfile('*.txt','Select a Stimulus File',app.loc);
end
if infile == 0 % user canceled
app.FileName.Text = 'Click Load From Text File or enter manually';
% give me back a string var for next time
infile = '';
app.loc = app.defLoc; % return to default string
return;
end
% Put full file name into the File field name and read it in
locfile = fullfile(app.loc,infile);
app.FileName.Text = locfile;
app.UITable2.Data = readtable(locfile);
end

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采纳的回答

Walter Roberson
Walter Roberson 2024-7-7
if isnumeric(infile)
instead of testing == 0
  3 个评论
显示 1更早的评论
Alessandro Livi
Alessandro Livi 2024-7-7
I've even tried this after the cancel:
% give me back a string var for next time
clear infile;
infile = '';
app.loc = app.defLoc; % return to default string
Command line shows infile = '' but still errors out
Walter Roberson
Walter Roberson 2024-7-7
Don't assign to app.Loc until after you have verified infile
if isempty(app.loc)
[infile, apploc] = uigetfile('*.txt','Select a Stimulus File',app.defLoc);
else
[infile, apploc] = uigetfile('*.txt','Select a Stimulus File',app.loc);
end
if infile == 0 % user canceled
app.FileName.Text = 'Click Load From Text File or enter manually';
% give me back a string var for next time
app.loc = app.defLoc; % return to default string
return;
end
app.loc = apploc;

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