Diplay a dialog box when using a wrong callback using images in gui

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Alejandro 2014-5-25

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/131106-diplay-a-dialog-box-when-using-a-wrong-callback-using-images-in-gui

评论： Alejandro 2014-6-2

I'm still learning how tu use GUI in matlab. i Have a gui that reads an image and display it. Then i have 3 buttons which converts the image into a grayscale image (R, G or B) then, using a slider, i set the threshold for a binary image. Well, when i use the slider without pressing any buttons (r, g or b) i get an error " Reference to non-existent fiel". And that's fine, i know i have to get an error there, but what i want to do is to display an error using waitfor(msgbox('')); when that error occurs. i'm still traying to do that, but i need a little help please.

Well, i want to use this gui when running a certain part from a code in a .mat file. For example. I run the code, read an image, then call the gui, binarize the same image, save the binarized image, and then use that saved image in the original code and continue the code. Hope it makes sense. How can i do this?

Here is the gui

function prueba_gui_OpeningFcn(hObject, eventdata, handles, varargin)
handles.output = hObject;
handles.imagen = imread('G:\Memoria\test\Imagen125.jpg');
axes(handles.axes1);
imshow(handles.imagen);
guidata(hObject, handles);
function varargout = prueba_gui_OutputFcn(hObject, eventdata, handles) 
varargout{1} = handles.output;
function binar_Callback(hObject, eventdata, handles)
handles.output = hObject;
axes(handles.axes1);
tempImg = handles.im;
thresholdValue = get(handles.binar, 'value');
binaryImage = tempImg> thresholdValue;
se = strel('square',4);
w = imdilate(binaryImage,se);
imshow(w);
guidata(hObject,handles);
function binar_CreateFcn(hObject, eventdata, handles)
if isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor',[.9 .9 .9]);
end
function RED_Callback(hObject, eventdata, handles)
handles.output = hObject;
axes(handles.axes1);
handles.im = handles.imagen(:,:,1);
imshow(handles.im);
guidata(hObject,handles);
function GREEN_Callback(hObject, eventdata, handles)
handles.output = hObject;
axes(handles.axes1);
handles.im = handles.imagen(:,:,2);
imshow(handles.im);
guidata(hObject,handles);
function BLUE_Callback(hObject, eventdata, handles)
handles.output = hObject;
axes(handles.axes1);
handles.im = handles.imagen(:,:,3);
imshow(handles.im);
guidata(hObject,handles);
% --- Executes on button press in save.
function save_Callback(hObject, eventdata, handles)
handles.output = hObject;
%nothing here yet

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采纳的回答

Image Analyst 2014-5-25

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/131106-diplay-a-dialog-box-when-using-a-wrong-callback-using-images-in-gui#answer_138231

See the FAQ for how to share variables between different functions in your m-file. http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.28s.29.3F

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Image Analyst 2014-5-26

You can save it in a mat file. That's one way listed in the FAQ. Though it's slower because you have to write to disk and read from disk. It's mostly used for passing data between two separate GUIs rather than within functions of the same GUI.

Alejandro 2014-6-2