How to call the Callback function （in a subfunction of another Callback function）?

2013 3 4
3 个回答
回答已采纳
更新时间：2016 11 25
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0 个投票

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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 采纳的回答

Sean de Wolski
Sean de Wolski 2013-3-4

0 个投票

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);

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Darshan Shah
Darshan Shah 2016-11-25
Can you explain this in detail. I am struggling to use this explanation. I am new to GUIDE and programming.

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更多回答（2 个）

Jan
Jan 2013-3-4

0 个投票

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.
QiQin Zhan
QiQin Zhan 2013-3-4

0 个投票

I think it may be the first error you've said.
If I have a experment.m file,the code is as follows
function test1
x = 1
function test2
y = 0
Then how can I call the function 'test1' and 'test2' in another .m file?

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Jan
Jan 2013-3-4
编辑：Jan 2013-3-4
@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.
QiQin Zhan
QiQin Zhan 2013-3-7
I think I've got exact answer from Sean.It's an excellent idea to use function handle to call the second function from other M-files.Anyhow I would thank you very much.

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