How do I automatically run code in a GUI upon startup?
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I am trying to create a monitoring GUI that will have to run without human intervention and I need it to start running the embedded code without a user having to push a button or click anything. It just needs to run as soon as its opened. Where do I put my code in the main GUI code? Under what callback or function should I place my code so that it will run with no human input?
Also, there is a single text box in the GUI that has a list of email addresses that the main code needs, which may be updated by a user at some time after the code has already started running. So the main code needs to be placed after the handles have been updated, so after all of the createFcn's have been run.
Thanks in advance for any help!
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Yann Vonderscher
2016 年 5 月 31 日
I ran into the same issue. I made a GUI that automatically starts calculation on a bunch of files located on a dedicated location. The GUI is there to indicate the status of the calculation, and indicate the name and date of the latest processed file.
It seems that the _OutputFcn(hObject, eventdata, handles) is called only once the GUI is fully loaded (i.e. GUI is visible, and all callbacks are set). Therefore, placing the call to the calculation scripts in this function solves my problem (so far, not fully tested).
Hope that helps.
YAV
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Juan Conde
2022 年 3 月 16 日
Worked for me as well when changing certain GUI things (like colormaps) that did not work properly in _OpeningFcn.
Thanks!
leeazlee
2016 年 9 月 7 日
put pause(0.005) after line varargout{1} = handles.output; in output function
eg:
function varargout = guidetest_OutputFcn(hObject, eventdata, handles)
% varargout cell array for returning output args (see VARARGOUT);
% hObject handle to figure
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Get default command line output from handles structure
varargout{1} = handles.output;
pause(0.001)
yourfunction
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Maxx Chatsko
2011 年 7 月 27 日
Putting the code in the OpeningFcn will not solve the problem. Since OpeningFcn "runs just before the GUI is displayed", all code in the OpeningFcn will certainly run, but the GUI will not appear.
It seems that the code will need to be placed after the OpeningFcn if you want the GUI to appear on the screen.
I tried placing a checkbox on the GUI with visibility "off", then setting the value to TRUE in the OpeningFcn, and finally placing my code in the callback for the checkbox. This does not trigger the callback however.
If anyone has a solution for making the GUI run upon opening I would greatly appreciate your feedback. Thanks!
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Maxx Chatsko
2011 年 7 月 27 日
Ah I see thanks for clearing that up. Unfortunately I am looking for a way for the GUI to appear upon opening AND while continuosly calculating. My program will run indefinately on a machine and I was hoping the GUI could show the user various statistics on calculations being performed.
I guess this is not possible? =(
Paulo Silva
2011 年 7 月 27 日
MATLAB only performs one task but surely you can do some workarounds, buttons to control the calculations, using the pause and drawnow functions to update the graphs...
There are also people opening MATLAB twice and having both communicating by some way like local network or files, one runs the calculations and another shows the results to the user.
Maxx Chatsko
2011 年 7 月 27 日
The line preceding the OpeningFcn call reads:
% --- Executes just before myfun is made visible.
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Jeff
2011 年 7 月 27 日
I put all of my initialization code in the OpeningFcn function line. Here is a snippet.
function CyberCalcMain_OpeningFcn(hObject, eventdata, handles, varargin)
global bd
% Choose default command line output for CyberCalcMain
handles.output = hObject;
%Initialize and load beam data into global variable
load('BeamData');
% Update handles structure
guidata(hObject, handles);
set(handles.oad2radiuscntrl,'Value',6);
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Paulo Silva
2011 年 7 月 27 日
I also do that but some people need to do tasks that take some time and the GUI figure only appears when all the OpeningFcn code is done.
Romesh
2011 年 10 月 29 日
Well my problem is that I want to incorporate a scroll bar using Project Waterloo. The scrollbar seems to only render correctly if the parent figure has already been drawn on the screen, so if I try and create the scroll bar object from within the OpeningFcn it fails because the GUI is yet to be rendered
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