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I have a problem with some code of GUI

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Farjana Yeasmin
Farjana Yeasmin 2014-11-30
关闭： MATLAB Answer Bot 2021-8-20
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,_);

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回答（1 个）

Geoff Hayes
Geoff Hayes 2014-11-30
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.

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