# File Exchange Pick of the Week

## Advanced MATLAB: Handles and other inputs to GUIDE callbacks

There are three inputs to every automatically generated callback from GUIDE:

function edit1_Callback(hObject, eventdata, handles)

A common question that I am asked is “What is the handles structure?” This four minute video will show a simple GUI where you edit some text, and press a button that will copy that text into a third uicontrol. This is all done using the handles structure. The other two inputs: hObject and eventdata will be briefly discussed also.

Video Content

### 17 Responses to “Advanced MATLAB: Handles and other inputs to GUIDE callbacks”

1. Quan replied on :

Nice video as usual. You need a nickname of some sorts . . . I was thinking “The MATLAB Evangelist” might a good one.

But seriously, good videos. I want to start linking them from blinkdagger because I think the tutorials supplement each other very well.

2. naor replied on :

Doug,
Can you explain about guidata(hObject,handles)? I thought this was necessary after any change to handles.
Thanks

3. Doug replied on :

Quan,

We actually had “MATLAB Evangelist” as a title for while when Scott was looking for people. Looks like we took that out of the title, but there are plenty of jobs like that for MATLAB geeks.

http://www.mathworks.com/company/jobs/opportunities/ApplicationEngineering.html

Send me a resume, we will see what we can do.

Doug

4. Doug replied on :

Naor,

About GUIDATA: That is a a different way of interacting with handles. I prefer handles to be more of a read-only type of structure. If I want to store data, then I advocate SETAPPDATA. See my video on this:

Doug

5. jiro replied on :

Quan,

There’s actually 6 of us at The MathWorks with an internal title of “LTC Evangelist” (LTC = Language of Technical Computing = MATLAB). I am one of them, and Doug used to be in this group as well.

6. amiryousuf replied on :

Hello, Can we output data entered by user in dialogbox to command window?

Amir,

You would simply modify the callback to use the DISP command to display any data you want.

Doug

8. amiryousuf replied on :

thanks for the idea. it is working.

9. Tayfun replied on :

ıt is very good video. I learn a lot of new things about gui

10. Zach replied on :

Doug,
I have a GUI that I put a timer in so that it will check if any serial data has come in every second. I am having trouble getting the Timer to pass the handles structure to my function that is plopped into the M-file that guide made. On compile it says that the “handles” is undefined. I tried to pass the hadles from the Timer funtion by saying {@myfunction, handles} to pass the handles to the myfunction but I get another compile problem. any help would be great.

11. Doug replied on :

Zach,

I think that the GETAPPDATA, SETAPPDATA techniques shown here:

http://blogs.mathworks.com/pick/2005/10/03/guide-video-part-two/

Might be an easy solution for you.

Doug

12. Zach replied on :

Doug,
I cant get the file to play from link or by going to list??

13. Doug replied on :

I have tested, it is working now.

Doug

14. nico replied on :

thank you!! i’ve been looking for something like this

15. Ferdy replied on :

Thanks a lot!! Been at it for some time now

16. Nabil replied on :

I would like to know how to pass data between different guis.