How to call the Callback function (in a subfunction of another Callback function)?
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QiQin Zhan
am 4 Mär. 2013
Kommentiert: Darshan Shah
am 25 Nov. 2016
The following is my code:
function pushbutton1_Callback(hObject, eventdata, handles)
body
function pushbutton2_Callback(hObject, eventdata, handles)
subfun(hObject, eventdata, handles) % sub(...) is a subfunction or a .m file
function subfun(hObject, eventdata, handles)
pushbutton1_Callback(hObject, eventdata, handles) % call pushbutton1_Callback
It's strange that matlab show the error message:
Undefined function 'pushbutton1_Callback' for input arguments of type 'struct'. I want to know how to call the function 'pushbutton1_Callback()' in function 'subfun()'.Thanks
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Sean de Wolski
am 4 Mär. 2013
You will have to pass the subfunction handles back from the main function:
%%%begin main.m%%%%
function [y, fh] = main(x)
y = pi*x;
fh = @subfun
function Q = subfun(a,b)
Q = a+b
%%%end main.m%%%
Now when you call main: you get the function handle back.
[y,fh] = main(2);
fh(1,2);
1 Kommentar
Darshan Shah
am 25 Nov. 2016
Can you explain this in detail. I am struggling to use this explanation. I am new to GUIDE and programming.
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Jan
am 4 Mär. 2013
The error message means, that:
- either the function pushbutton1_Callback is not visible ftom subfun(), e.g. if the callback is a subfunction of an M-file, but subfun() is stored in another M-file.
- or you use a struct as first input, while the callback requires the handle of the button as 1st input:
pushbutton1_Callback(ButtonHandle, EventData, handles)
Here EventData could be the empty matrix, if the callback function can handle this.
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QiQin Zhan
am 4 Mär. 2013
2 Kommentare
Jan
am 4 Mär. 2013
Bearbeitet: Jan
am 4 Mär. 2013
@Chan: Is this a comment? If so, does it concern my answer? If so, please post this as a comment to reduce the confusion level.
Only the first function of an M-file can be called from other M-files. So either include a wrapper, such that the 1st function forwards the call to different subfunctions, or save the functions to individual M-files.
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