How to retrieve data entered in an edit box

I have an edit box in my GUI. User inputs a number into the editbox and then pushes a pushbutton. when the pushbutton is pressed an external function is called. for the external function i need the number entered in the editbox. How can i used 'handles' to retrieve the data input in the edit box?

Answer 1

[Azzi Abdelmalek]

s=str2double(get(handles.editboxname,'string'))

% editboxname is the tag of your edit box.

[Achchuthan Ganeshanathan]

would I have to define 's' somewhere else, other than when I am using it in my callback function. Do i need to define s=0 before my opening function for example

[Azzi Abdelmalek]

If you want to set it to 0 in your opening function

set(handles.editboxname,'string','0')

[Achchuthan Ganeshanathan]

I set it as 0 just before my opening function. my editbox is called EnterSpeed. I have made my GUI three times I keep debugging but i am still coming up with errors for e.g:-

??? Undefined variable "handles" or class "handles.EnterSpeed".

Error in ==> NEWSTALLGUI at 46
set(handles.EnterSpeed,'string','0');

>>

[Azzi Abdelmalek]

How did you create the name EnterSpeed ?

[Achchuthan Ganeshanathan]

% --- Executes just before NEWSTALLGUI is made visible.
function NEWSTALLGUI_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% varargin   command line arguments to NEWSTALLGUI (see VARARGIN)

% Choose default command line output for NEWSTALLGUI
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);
*set(handles.EnterSpeed,'string','0');*

% UIWAIT makes NEWSTALLGUI wait for user response (see UIRESUME)
% uiwait(handles.figure1);

I I have set EnterSpeed as 0 in my opening function. When I created the editbox I changed it into EnterSpeed. Do you think it will be easier to work with name such as 'editbox'

[Azzi Abdelmalek]

No this have nothing to do with the name, I am not sure that the name is EnterSpeed. When you click on view callback of your editbox, which name are you seeing?

[Achchuthan Ganeshanathan]

I am not sure what you mean exactly tbh.

function EnterSpeed_Callback(hObject, eventdata, handles)
% hObject    handle to EnterSpeed (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of EnterSpeed as text
%        str2double(get(hObject,'String')) returns contents of EnterSpeed as a double
user_speed=str2double(get(handles.EnterSpeed,'string'));

This is my callback code for my editbox

[Azzi Abdelmalek]

The code

user_speed=str2double(get(handles.EnterSpeed,'string'));

You should put it in the pushbutton callback, NOT the edit field callback.

[Achchuthan Ganeshanathan]

thankyou that has done the trick