MATLAB: Pass extra parameter to UpdatePreviewWindowFcn (anonymous function required?)

Question

I have written some code to get a preview stream from a camera and display it in a figure after modifying it. In the figure I have the following statement:

setappdata(previewImage,'UpdatePreviewWindowFcn',@GUI_editPreview);

where GUI_editPreview is the function that changes the data before display. At the moment I do not pass any parameter to the function but I would like to add one. I have tried to use:

setappdata(previewImage,'UpdatePreviewWindowFcn',{@GUI_editPreview, myParameter});

But Matlab produces an error "UpdatePreviewWindowFcn must be configured to a function_handle." I suspect I have to use anonymous functions but I could not figure out a way to do it correctly. What would be the correct syntax, in this case?

Answer 1

I found a workaround:

instead of passing the parameter in the function, I save it as an appdata of the previewImage. I can then retrieve it when needed. So my code becomes:

setappdata(previewImage,'UpdatePreviewWindowFcn',@GUI_editPreview);
setappdata(previewImage,'HandleToMainFig',mainFig);

and in the GUI_editPreview I use

mainFig = getappdata(himage,'HandleToMainFig');