How to Update Data automatically in a UITABLE GUI?

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Davin
Davin 2015-8-11
评论： Davin 2015-8-12
Hello,
I am not very used to the GUI framework of MATLAB. I have a GUI, a uitable which is linked to a table situated in my workstation in which the data are constantly changing. So I want to know how I can make the data which are shown in the GUI table, dynamic with a timer say a refresh each 10 seconds.
From what I can see, you need to initiate a timer then a callback?
I would really appreciate any help.
Thank you
D.

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回答（1 个）

Walter Roberson
Walter Roberson 2015-8-11
Yes, a timer with a callback that fetched the latest information and set() the Data property of the uitable should work.
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Walter Roberson
Walter Roberson 2015-8-12
OpenFcn is as good a place as any when you are using GUIDE. The Callback would be a property you set for the timer object. It would have nothing to do with CellEditCallback. It should call a function that grabs the data from the table on your workspace (I am presuming that is a database access or perhaps an ActiveX call to Excel).
guifig = ancestor(hObject, 'figure');
timerobj = timer(.....);
set(timerobj, 'Callback', @(src,evt) Update_From_Table(src, evt, guifig));
...
function Update_From_Table(hObject, event, guifig)
handles = guidata(guifig);
do something to get the update from the workspace table into newdata
set(handles.uitable1, 'Data', newdata);
Davin
Davin 2015-8-12
Thanks Walter. I am very new to GUI coding, so I am still a bit stuck on that, the objective of the code is to import changing values from a table in the workspace, my code is like this
guidata(hObject, handles)
guifig = ancestor(hObject, 'figure')
timerobj = timer('TimerFcn', 'stat=false; disp(''Lag'')',...
'StartDelay',3);
start(timerobj)
function Callback(obj, event, string_arg)
txt1 = ' event occurred at ';
txt2 = string_arg;
event_type = event.Type;
event_time = datestr(event.Data.time);
msg = [event_type txt1 event_time];
disp(msg)
disp(txt2)
set(timerobj, 'Callback', @(src,evt) Update_From_Table(src, evt, guifig))
function Update_From_Table(hObject, event, guifig)
handles = guidata(guifig)
newdata = evalin('base', 'JadeVine')
set(handles.JadeVineCapitalPortfolio, 'Data', newdata);
But there is an issue on the Set command, it does not recognise the Callback. Normally, when i will be be changing a value in XL, the same value is being changed in my MATLAB workspace, then hopefully refreshed on the GUI.Thats why i need a timer to refresh the table each 3 to 5 seconds... All of this is in the OpenFcn section....
Could you please give some insigts please?
Thanks very much
D

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