I have a problem with some code of GUI

from the 1st function embed_ok i want to use the m_length in the 2nd function in the position of retrieve(image_string,_) How can I do that ? _ is the expected position of m_length

function embed_ok_Callback(hObject, eventdata, handles)
% hObject    handle to embed_ok (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
image_string=get(handles.image1,'String');
text_string=get(handles.text_file,'String');
[m_length,mes]=embed(image_string,text_string);

function retrieve_ok_Callback(hObject, eventdata, handles)
% hObject    handle to retrieve_ok (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
image_string=get(handles.image2,'String');
retrieve(image_string,_);

[Image Analyst]

Are they in completely separate GUIs? Have you tried the FAQ: http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.28s.29.3F

Answer 1

[Geoff Hayes]

Farjana - save m_length to the handles structure using guidata so that the other callback can access this data. For example, your first callback would become

function embed_ok_Callback(hObject, eventdata, handles)

image_string=get(handles.image1,'String');
text_string=get(handles.text_file,'String');
[m_length,mes]=embed(image_string,text_string);

% save the length
handles.m_length = m_length;
guidata(hObject,handles);

Then in your second callback, just reference this field of handles as

handles.m_length

though you may want to add a guard to ensure that thus field exists before trying to see it.