Cannot find function figure1_KeyPressFcn in GUI code file

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Stephen 2017-8-9

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https://ww2.mathworks.cn/matlabcentral/answers/352146-cannot-find-function-figure1_keypressfcn-in-gui-code-file

回答： Kai Tanaka 2019-8-1

In the GUIDE editor, when I right click on the figure and go to add a callback, pressing the KeyPressFcn callback selection yields a msgbox error which says "Cannot find function figure1_KeyPressFcn in GUI code file C:". Note that there is no path given after "C:". When a keypress event occurs during runtime, there is an error printed to console which states "error using feval ... undefined function 'figure1_KeyPressFcn' ..."

How should I go about fixing this error?

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Stephen 2018-1-19

Richard, no, I never did figure out how to fix this. I ended up re-creating the GUI from scratch in guide and then copying in the relevant code. I think it happened originally because I copied a .fig file I'd edited in parallel with the code (trying to sync the UI changes with the latest code file by just replacing the .fig file). But no easy answer, I think it's just corrupted file(s)

Richard Moyse Fenning 2018-1-19

Thanks Stephen.

Following an answer to a different question, I did 'save as' on the fig and it seems to work OK now. I'm not 100% sure the two are related though :)

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Answer 1

Kai Tanaka 2019-8-1

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https://ww2.mathworks.cn/matlabcentral/answers/352146-cannot-find-function-figure1_keypressfcn-in-gui-code-file#answer_385779

I also ran into this issue and was able to find a way to resolve it. It appears the error can be caused by creating the callback code and then deleting it. In order to get GUIDE to regenerate the code: