How to display the values using isfield, isempty or exist in the GUI?

Hi,

I have made a GUI using GUIDE. I have two functions:

function one_Callback(hObject, eventdata, handles)

 Two variables are there "levelLow" and "levelHigh" 

 % when I run this callback function I'll get these values

function two_Callback(hObject, eventdata, handles)

 Another two variables are there "LowH" and "HighH"

When I execute the GUI, with the help of push buttons I can get either values for function one_Callback or function two_Callback at a time.

------------------------------------------

Using a push button I wish to display these values in the GUI.

%I tried but I couldn't get the desired output..

 function pushbutton_callback

 limits=[LowH, HighH];

 if isfield(limits, 'LowH') || exist('LowH')

 thresholdDetails=sprintf(' \n \n \n Lower Hue Level for Bgal= %.2f \n Higher Hue Level for Bgal = %.2f \n ',LowH,HighH);  

 else 
  
thresholdDetails=sprintf(' \n \n \nLower Threshold Level =%.2f \n Higher Threshold Level=%.2f\n', levelLow, levelHigh);
end

 set(handles.text2,'string',thresholdDetails);

% For this one I Could get only Hue level values but not the threshold values. When I run the function one I couldn't get the levelLow and levelHigh values.

I need to display the values of the lower hue level when I run function two and need to get lower threshold level values to diaplay when I run function one. please help me so that I can get the desired output.

Thanks..

Answer 1

[Geoff Hayes]

Manoj - are you saving your variables to the handles structure? Because it is this structure that is passed to the different callbacks, and it can be used to manage your user-defined data.

For example, in your one_Callback do the following

 function one_Callback(hObject, eventdata, handles)

 % do stuff

 % set fields within the handles structure
 handles.levelLow  = levelLow;
 handles.levelHigh = levelHigh;

 % save the structure
 guidata(hObject,handles);

Do the same in your two_Callback

 function two_Callback(hObject, eventdata, handles)

 % do stuff

 % set fields within the handles structure
 handles.lowH  = lowH;
 handles.highH = highH;

 % save the structure
 guidata(hObject,handles);

Now, in your pushbutton_callback, you can reference these local variables through the handles structure

function pushbutton_callback(hObject, eventdata, handles)

limits=[handles.LowH, handles.HighH];

% etc.