How can I open multiple bin files from one folder with uigetfile command?

Question

Kofial 2019-12-5

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/494993-how-can-i-open-multiple-bin-files-from-one-folder-with-uigetfile-command

评论： Kofial 2019-12-11

Here is the code for one file. 
[filename, pathname] = uigetfile('*.bin', 'Drohnenmessdatei  auswahlen');
if isequal(filename, 0)
    disp('User selected ''Cancel''')
else
    disp(['Datei ausgewahlt: ', fullfile(pathname, filename)])
end
datei=dir(fullfile(pathname, filename));
dateigroesse_bytes=datei.bytes;
dateigroesse_bytes= round(dateigroesse_bytes/72);
fileID = fopen(filename);
bool_var_a_da = exist ('a', 'var')
if(bool_var_a_da == 0)
    a =1;
    Zeitstempel=zeros(dateigroesse_bytes,6);
else
    
end

I tried with

[filename, pathname] = uigetfile('*.bin', 'Select file','MultiSelect','on');

but it doesnt work.

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Answer 1

Walter Roberson 2019-12-5

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https://ww2.mathworks.cn/matlabcentral/answers/494993-how-can-i-open-multiple-bin-files-from-one-folder-with-uigetfile-command#answer_404907

在 MATLAB Online 中打开

When you use multiselect in uigetfile, then you need to use something like

if isnumeric(filename)
   disp('User selected ''Cancel''');
   return
end
if ~iscell(filename)
    filename = {filename};
end

This is because if the user only selected one file, then what is returned is the character vector of the file name, but if the user selected more than one, then what is returned is a cell array of character vectors.

Instead of the second if that I show there, you can just code

filename = cellstr(filename);

cellstr() leaves the input as-is if it is already a cell array, but converts the input to cell array of character vectors if the input is character.

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Kofial 2019-12-5

It doesn't work. Gives this error:

Error in matlab.ui.internal.dialog.FileChooser/updateFromDialog (line 215)

obj.PathName = filepaths{1};

Error in matlab.ui.internal.dialog.FileChooser/prepareDialog/localupdate (line 95)

updateFromDialog(obj,updateDataObject(obj));

Walter Roberson 2019-12-5

Is there more to the error message? What triggers that message? At the moment it looks like a problem in the internal code. Which operating system are you using, and which MATLAB version are you using?

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Answer 2

Kofial 2019-12-9

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https://ww2.mathworks.cn/matlabcentral/answers/494993-how-can-i-open-multiple-bin-files-from-one-folder-with-uigetfile-command#answer_405579

Hi. You were right, was a problem of the system. Sorry Im still new in matlab and Im still trying to learn .

When I use your suggestion it gives this:

Error using dir

Name must be a string scalar or character vector.

Error in Binaerdaten_Drohne_V2 (line 24)

datei=dir(fullfile(pathname, filename));

I guess I will need a command to combine different cell arrays into one.

I tried with filename = strjoin(filename) but it doesn't work.

Files look like this:

00191009.bin 00191010.bin.

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Walter Roberson 2019-12-9

在 MATLAB Online 中打开

if isnumeric(filename)
   disp('User selected ''Cancel''');
   return
end
filename = cellstr(filename);
fullnames = fullfile(pathname, filename);
numfiles = length(fullnames);
output = cell(1, numfiles);
dateigroesse_bytes = zeros(1, numfiles);
for K = 1 : numfiles
    thisfile = filenames{K};
    datei = dir(thisfile);
    dateigroesse_bytes(K) = datei.bytes;
    dateigroesse_bytes(K) = round(dateigroesse_bytes(K)/72);
    fileID = fopen(thisfile);
    bool_var_a_da = exist ('a', 'var');
    if (bool_var_a_da == 0)
        a =1;
        Zeitstempel = zeros(dateigroesse_bytes(K),6);
    end
    now do something to calculate a result and store it in outputs{K}
end