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setappdata and getappdata issues in matlab gui

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Ria3242
Ria3242 2016-9-29
评论： Ria3242 2016-10-5
I want to share a numeric count between two callbacks in such a way that at first the count gets incremented and 'set' by setappdata after some processing. Then I push another button and want to get the incremented value through getappdata. My getappdata statement is not getting the value in a new variable.
My code is:
handles.output=hObject;
password_count = getappdata(UserRegistrationPhase,'CurrentPasswordCount');
%then some code work with password_count
setappdata(UserRegistrationPhase,'CurrentPasswordCount',password_count);
in the other pushbutton callback:
handles.output = hObject;
current_pass = getappdata(UserRegistrationPhase,'CurrentPasswordCount');
switch current_pass
case 1
%and so on with the code
When I debug step-by-step, the getappdata line does nothing, and does not give the new value of incremented variable i.e. password_count. Getting confused. Im in the need of help for this. Thanks in advance.
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Ria3242
Ria3242 2016-10-5
this is my GUI name. i guess Im putting it the wrong way am I?
Adam
Adam 2016-10-5
If it is the GUI name then
handles.UserRegistrationPhase
should be the handle to the GUI itself.

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Geoff Hayes
Geoff Hayes 2016-9-29
Ria3242 - since you are using GUIDE to create your GUI, then just use the handles structure to store the password count. Every callback has access to this structure and receives an updated version whenever the callback is called. For example, in your first set of code you would do
password_count = 0;
if isfield(handles,'CurrentPasswordCount')
password_count = handles.CurrentPasswordCount;
end
%then some code work with password_count
% save the updated password count
handles.CurrentPasswordCount = password_count;
guidata(hObject,handles);
Then, in your push button callback just do
password_count = 0;
if isfield(handles,'CurrentPasswordCount')
password_count = handles.CurrentPasswordCount;
end
Try the above and see what happens!

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