Using a file across GUI functions

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Emma 2015-1-30

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https://ww2.mathworks.cn/matlabcentral/answers/173491-using-a-file-across-gui-functions

编辑： Emma 2015-1-30

Hi, I've done a lot of trying to find an answer to my question and can't find a solution.

I'm making a GUI which I want to load in a file (of EEG data) when a pushbutton is pressed, and then be able to call this later on to use in other functions. Below is my code at the moment. I then want the file that I've clicked on when "open" appears from uigetfile to actually be available in the workspace etc. I assume it has something to do with handles.

I hope this makes sense. I'm using GUIDE and very new to it, any help greatly appreciated.

Thanks, Emma

function Load_Callback(hObject, eventdata, handles)

[filename pathname]=uigetfile({'*.*', 'matlab'});

fullfile = strcat(pathname, filename);

load([num2str(fullfile)])

set(handles.data_load, 'String', fullfile) %shows full path name in a text box

set(handles.listbox1, 'String', filename) %shows filename in data list box

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Jan 2015-1-30

编辑：Jan 2015-1-30

Better use fullfile as command instead of strcat.

You want to be able to call what later on? The file name or the contents of the file?

Emma 2015-1-30

编辑：Emma 2015-1-30

Okay thanks. The contents of the file but also the name for display purposes. But the data contained is what I really need.

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Answer 1

Jan 2015-1-30

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/173491-using-a-file-across-gui-functions#answer_166443

在 MATLAB Online 中打开

If you really want to write the contents of the file to the base workspace:

File = fullfile(pathname, filename);
Data = load(File);
assignin('base', 'Data', Data);

Now the variable "Data" is created in the base workspace. I strongly recommend not to import the contents of the file directly without catching the output of the load command. Otherwise it gets a horror to debug your code. What might happen if the MAT file contains a variable which is called "exit" and you want to quit Matlab?

The clean way would be to store the data in the figures UserData oder ApplicationData. Then a specific function can extract it, when other callbacks or GUIs want to process it. Poofing the base workspace is like using global variables. It works, when the program is small and only one program is used. But as soon as 2 GUIs are open at the same time, there is no chance to prevent collisions, if the variables have the same name.

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Emma 2015-1-30

编辑：Emma 2015-1-30

Thank you, I have done that and get my data in a structure "Data". How do I then extract the elements from the structure in a later function? - I get the "undefined function/variable" error message.

EDIT: struct2array! Have managed it, thanks for your help :)

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