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April 17th, 2008

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

iconFiles.jpgiconPod.jpg

By Doug Hull

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

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15 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

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