Unable to open a file with uigetfile in Matlab

问题

I am building a code that lets the user open some files.

reference = warndlg('Choose the files for analysis.');
uiwait(reference);
filenames2 = uigetfile('./*.txt','MultiSelect', 'on');
if ~iscell(filenames2)
    filenames2 = {filenames2};    % force it to be a cell array of strings
end
numberOfFiles = numel(filenames2);

data = importdata(filenames2{i},delimiterIn,headerlinesIn);

When I run the code, the prompts show up, I press OK, and then nothing happens. The code just stops, telling me :

Error using importdata (line 137)
Unable to open file.

Error in FreqVSChampB_no_spec (line 119)
data=importdata(filenames2{1},delimiterIn,headerlinesIn);

I just don't have the opportunity to select a file. The cellarray stays empty as showed in the following image.

回答1:

MATLAB can't find the file that you have selected. Your variable filenames2 contains only the name of the file, not its full path. If you don't provide the full path to importdata, it will search for whatever file name you provide on the MATLAB path, and if it can't find it it will error as you see.

Try something like this - I'm just doing it with single selection for ease of description, but you can do something similar with multiple selection.

[fileName, pathName] = uigetfile('*.txt');
fullNameWithPath = fullfile(pathName, fileName);
importdata(fullNameWithPath)

fullfile is useful, as it inserts the correct character between pathName and fileName (\ on Windows, / on Unix).

回答2:

You can try to add

pause(0.1);

just after uiwait(reference);

For me it works. In fact I've noticed the active windows changes when we use uiwait and uigetfile.

来源：https://stackoverflow.com/questions/16216968/unable-to-open-a-file-with-uigetfile-in-matlab