File Exchange Pick of the Week

April 17th, 2008

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

By Doug Hull

Doug first used MATLAB in 1994, could not figure it out until he got some help in 1995. He is now dedicated to making sure that no one else wastes a year of their life not knowing MATLAB like he did.

11:39 UTC | Posted in Advanced MATLAB, GUI or GUIDE, PodCast, Video | Permalink | 17 Comments »

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

1. Quan replied on April 17th, 2008 at 17:15 UTC :
   

   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 April 17th, 2008 at 19:49 UTC :
   

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

3. Doug replied on April 18th, 2008 at 08:15 UTC :
   

   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 April 18th, 2008 at 08:17 UTC :
   

   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:

   http://www.mathworks.com/matlabcentral/fileexchange/loadFile.do?objectId=8616&objectType=FILE

   Doug

5. jiro replied on April 18th, 2008 at 15:21 UTC :
   

   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 May 6th, 2008 at 03:31 UTC :
   

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

7. Administrator replied on May 6th, 2008 at 11:00 UTC :
   

   Amir,

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

   Doug

8. amiryousuf replied on May 7th, 2008 at 06:53 UTC :
   

   thanks for the idea. it is working.

9. Tayfun replied on July 27th, 2008 at 06:38 UTC :
   

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

10. Zach replied on October 27th, 2008 at 16:57 UTC :
    

    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 October 29th, 2008 at 14:34 UTC :
    

    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 October 29th, 2008 at 22:37 UTC :
    

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

13. Doug replied on October 31st, 2008 at 08:59 UTC :
    

    I have tested, it is working now.

    Doug

14. nico replied on December 21st, 2008 at 02:25 UTC :
    

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

15. Ferdy replied on September 23rd, 2009 at 08:11 UTC :
    

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

16. Nabil replied on May 9th, 2012 at 14:29 UTC :
    

    I would like to know how to pass data between different guis.
    Thank you in advance

17. Hugo replied on May 27th, 2012 at 11:45 UTC :
    

    Hey my friend. How can I add a “Edit text” and make it visible only when the user press a “Push Button”? Tnx and God bless you !!

These postings are the author's and don't necessarily represent the opinions of MathWorks.