MATLAB: How to code this command in gui

codefunctionguimultiple variables

I have a function I am working on, "SetImage"
[ret] = SetImage(hbin, vbin, hstart, hend, vstart, vend)
I am making a gui that lets you enter each of these parameters into text boxes, once the "set image" button is clicked it will read the data I have typed into the text boxes and use them for each parameter in this function…
I am unaware of how I can set each box to correspond to each individual parameter, this is my attempt to do so:
% --- Executes on button press in setimagebutton.
function setimagebutton_Callback(hObject, eventdata, handles)
% hObject handle to setimagebutton (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
setimgp1=('handles.setimgh'),('String')
setimgp2=('handles.setimgv'),('String')
setimgp3=('handles.setimgstartc'),('String')
setimgp4=('handles.setimgendc'),('String')
setimgp5=('handles.setimgstartrow'),('String')
setimgp6=('handles.setimgendrow'),('String')
[ret]=SetImage(setimgp1,setimgp2,setimgp3,setimgp4,setimgp5,setimgp6);
The handles are the tags of each of my edit boxes, when I try to run it I receive the error message:
Error using atmcdmex SetImage- parameter 6 is not a number
Error in SetImage (line 25) [ret] = atmcdmex('SetImage', hbin, vbin, hstart, hend, vstart, vend);
Error in CamTestGUI>setimagebutton_Callback (line 1866) [ret]=SetImage(setimgp1,setimgp2,setimgp3,setimgp4,setimgp5,setimgp6);
Error in gui_mainfcn (line 96) feval(varargin{:});
Error in CamTestGUI (line 42) gui_mainfcn(gui_State, varargin{:});
Error in @(hObject,eventdata)CamTestGUI('setimagebutton_Callback',hObject,eventdata,guidata(hObject))
Error while evaluating uicontrol Callback

Best Answer

  • Jonathan - you almost have the correct code. You will need to use the get function in order to get the string data from the widget, and then save it to the variable. But since the variables appear to be numeric in nature, you will have to convert them from a string to a number
    setimgp1=str2num(char(get(handles.setimgh,'String')));
    setimgp2=str2num(char(get(handles.setimgv,'String')));
    setimgp3=str2num(char(get(handles.setimgstartc,'String')));
    setimgp4=str2num(char(get(handles.setimgendc,'String')));
    setimgp5=str2num(char(get(handles.setimgstartrow,'String')));
    setimgp6=str2num(char(get(handles.setimgendrow,'String')));
    The char function is used to convert the result of the get from a cell to an array of characters (a string). You may or may not need this, but it can't hurt.
    Note that if any of the widgets have non-numeric text, then the above conversions may result in an empty matrix being assigned to one of the variables. You may want to add some logic in your code to guard against this happening.
    Try the above and see what happens!