GUI script/function issue

Hello everyone,

I am having some problems with the creation of a GUI. I am relatively new to GUI so I am having a problem that I cannot figure out. Here it is. I created a GUI in which you input some parameters and when you press next it stores them and moves to the next window. It all worked fine when I had it in my script, but now I am trying to make my code modular and I want to have the GUI as a separate function. However, when I move it to a function, I get an error because my handle numbers for some reason are not passed to the callback function when the user presses next. I am not sure what the issue is and I don't know how to resolve it.

A little sample code is given here:

function UiData = Heat_Sink_UI

close all;
%Create Figure

h = figure('Name','Geometry Selection','NumberTitle','off');

uicontrol(h,'Style', 'text','String', 'Thermal Inputs' ,'Position', [20 390 520 20],'FontWeight','bold','FontSize',11);

% Inlet temperature in text format.

uicontrol(h,'Style', 'text','String', 'Inlet Temperature [K]: ' ,'Position', [150 340 260 30],'FontWeight','bold','FontSize',11);
h2=uicontrol(h,'Style', 'edit','String', '23' ,'Position', [150 300 260 30],'FontSize',11);

% Heat to be dissipated.

uicontrol(h,'Style', 'text','String', 'Heat Load [W]: ','Position', [150 240 260 30],'FontWeight','bold','FontSize',11);
h3=uicontrol(h,'Style', 'edit','String', '300','Position', [150 200 260 30],'FontSize',11);

% Save values in array Therm and move forward.

hc = uicontrol('Style', 'pushbutton','String', 'Next','Position', [320 20 200 20],'FontSize',11);

set(hc,'Callback','Therm=Store_Move_to_Next([h2 h3],h,1,[1 1]);')

uiwait(h)

clf(h)

function [val] = Store_Move_to_Next(hObject,h,l,k)

n = length(hObject);

for i=1:n;

      if k(i)==1

          %For text edit.

          val.text(:,i) = str2double(get(hObject(i),'String'));

      elseif k(i)==2;

          %For listbox.

          val.list(:,i) = (get(hObject(i),'Value'))';

      end

      if l == 1;

          uiresume(h)

      else

      end

end

The code runs totally fine when I run it as a script but when I run it as a function I'll get something like:

Error using waitfor
Undefined function or variable 'h2'.

Error using waitfor
Error while evaluating uicontrol Callback

but h2, h3 and h are defined. Again, it runs fine as a script but when I run it as a function it does not pass the figure (or uicontrol) handles to the callback functions.

Thank you in advance for your help,

Krsto

Answer 1

[Walter Roberson]

Callbacks that are strings are evaluated in the base workspace. Your h2 and so on are not being defined in the base workspace: they are being defined in the workspace of Heat_Sink_UI

Please see http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.3F

Answer 2

[Krsto Sbutega]

Walter, Thanks a lot for your answer. That makes sense but I did not know that. Thanks for the the link. I'll work on it and let you know how it goes. Krsto