GUI Push Button Behavior

Question

Jared 2012-12-11

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/56241-gui-push-button-behavior

I have a push button which, when pressed, uses the uigetdir function to get a directory. However, when I press it again, I get an error:

??? Undefined function or method 'Program' for input arguments of type
'struct'.
Error in ==>
@(hObject,eventdata)Program('load_Callback',hObject,eventdata,guidata(hObject))
??? Error while evaluating uicontrol Callback

I want it to simply reopen the uigetdir dialog and load a new directory, if pressed again.

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Answer 1

Image Analyst 2012-12-11

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https://ww2.mathworks.cn/matlabcentral/answers/56241-gui-push-button-behavior#answer_68111

Does "Program" try to call another function called "Prpgram"??? Maybe it's just a spelling mistake. What is the tag property of your pushbutton? Is the button called load? Set a breakpoint in the callback. Does it ever get there when you click the button? Do you know how to use the debugger? This would be fairly simple if you did.

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Jared 2012-12-11

That was a typo in my question, which I have fixed. I figured it out, was very simple. When I am using that directory to load files, I was not switching back to the root directory where the .exe was located. Once I did a cd(root), it was good to go.

Good tip on the debugger, I should practice with it.

Image Analyst 2012-12-11

cd() should not be necessary - I rarely use it. uigetdir() will work just fine without calling cd(). However if you pass a directory to uigetdir(), you should use exist(folder, 'dir') first to make sure the directory exists.

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