Uigetfile returns zero without opening window

Hi all,

I am using uigetfile in a GUI I designed in the AppDesigner. After a couple of times of running the GUI, running other scripts, or using the debugger, I always get to the point where the uigetfile returns 0 without opening a selection window.

The only solution to work around this so far is to restart MATLAB every time which is quite annoying. Also I haven't managed to determine after which point this starts to happen.

I could post a working example, but in the simplest of cases, the easiest way to test that is by typing uigetfile in the command window, which will either work/not work as I described above.

Below is my MATLAB version running in MacOS Monterey 12.4

>> ver
-----------------------------------------------------------------------------------------------------
MATLAB Version: 9.12.0.1884302 (R2022a)
MATLAB License Number: xxxxxxx
Operating System: macOS  Version: 12.4 Build: 21F79 
Java Version: Java 1.8.0_202-b08 with Oracle Corporation Java HotSpot(TM) 64-Bit Server VM mixed mode
-----------------------------------------------------------------------------------------------------
MATLAB                                                Version 9.12        (R2022a)
Simulink                                              Version 10.5        (R2022a)
Control System Toolbox                                Version 10.11.1     (R2022a)
Curve Fitting Toolbox                                 Version 3.7         (R2022a)
Database Toolbox                                      Version 10.3        (R2022a)
Datafeed Toolbox                                      Version 6.2         (R2022a)
Deep Learning Toolbox                                 Version 14.4        (R2022a)
Fuzzy Logic Toolbox                                   Version 2.9         (R2022a)
Global Optimization Toolbox                           Version 4.7         (R2022a)
Image Acquisition Toolbox                             Version 6.6         (R2022a)
Image Processing Toolbox                              Version 11.5        (R2022a)
Instrument Control Toolbox                            Version 4.6         (R2022a)
MATLAB Coder                                          Version 5.4         (R2022a)
MATLAB Compiler                                       Version 8.4         (R2022a)
MATLAB Compiler SDK                                   Version 7.0         (R2022a)
MATLAB Report Generator                               Version 5.12        (R2022a)
Mapping Toolbox                                       Version 5.3         (R2022a)
Model Predictive Control Toolbox                      Version 7.3         (R2022a)
Motor Control Blockset                                Version 1.4         (R2022a)
Navigation Toolbox                                    Version 2.2         (R2022a)
Optimization Toolbox                                  Version 9.3         (R2022a)
Parallel Computing Toolbox                            Version 7.6         (R2022a)
Partial Differential Equation Toolbox                 Version 3.8         (R2022a)
Predictive Maintenance Toolbox                        Version 2.5         (R2022a)
Robust Control Toolbox                                Version 6.11.1      (R2022a)
Sensor Fusion and Tracking Toolbox                    Version 2.3         (R2022a)
Signal Processing Toolbox                             Version 9.0         (R2022a)
Simulink Check                                        Version 6.0         (R2022a)
Simulink Coder                                        Version 9.7         (R2022a)
Simulink Compiler                                     Version 1.4         (R2022a)
Simulink Control Design                               Version 6.1         (R2022a)
Simulink Coverage                                     Version 5.4         (R2022a)
Simulink Design Optimization                          Version 3.11        (R2022a)
Simulink Design Verifier                              Version 4.7         (R2022a)
Simulink PLC Coder                                    Version 3.6         (R2022a)
Simulink Report Generator                             Version 5.12        (R2022a)
Simulink Test                                         Version 3.6         (R2022a)
Statistics and Machine Learning Toolbox               Version 12.3        (R2022a)
Symbolic Math Toolbox                                 Version 9.1         (R2022a)
System Identification Toolbox                         Version 9.16        (R2022a)
>> 

[Cameron B]

How many times do you have to call the uigetfile function before it begins to return 0 without opening a window? I ran this and didn't have any issues. I tried selecting files, hitting Cancel, and hitting X on the window, but it all seems to work as intended.

for ii = 1:20
    [file,path,indx] = uigetfile('*.*')
end

[KostasK]

Quite a few, cannot tell for sure. That is because it does not seem to be causing this when I call it consecutively, but when I have used the debugger or have performed some actions in between subsequent calls... Anyway still haven't figured out why or how this happens exactly which I appreciate makes it a hard question to answer. So far have been working around this.

[Bruno Luong]

Just a wild guess but 0 is normally returned when user clicks on close button. May be MATLAB or OS (I don't know Mac OS at all) has a stacks of callback events. You might try to put

drawnow

before uigetfile to clear the pending pending callback.

You might also want to try to set the properties of the parent GUI component 'BusyAction' to 'drop' and 'Interruptible' to 'off'.