Error using matlab.ui.​control.UI​Control/ge​t Invalid or deleted object inside a while loop

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Truc
Truc 2022-9-19
评论： Walter Roberson 2022-9-19
I click on the plot data in an axes window all goes fine, except when i finish/end the gui this error occurs.
Error using matlab.ui.control.UIControl/get
Invalid or deleted object.
Error in BSAKit>pbtECG_Callback (line 207)
while get(hObject,'Value')
Error in gui_mainfcn (line 95)
feval(varargin{:});
Error in BSAKit (line 42)
gui_mainfcn(gui_State, varargin{:});
Error in matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)BSAKit('pbtECG_Callback',hObject,eventdata,guidata(hObject))
Error while evaluating DestroyedObject Callback.
Code:
function pbtECG_Callback(hObject, eventdata, handles)
% hObject handle to pbtECG (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
clc;
global ecgdata;
warning off
yMax = 1.5; %y Maximum Value
yMin = -0.5; %y minimum Value
plotGrid = 'on'; % 'off' to turn off grid
min = 0; % set x-min
max = 5; % set x-max
delay = .001; % make sure sample faster than resolution
t = 0;
e1 = 0;
e2 = 0;
e3 = 0;
plotTitle = 'ECG plot'; % plot title
xLabel = 'Time (s)'; % x-axis label
yLabel = 'ECG (V)'; % y-axis label
legend1 = 'Lead 1';
legend2 = 'Lead 2';
legend3 = 'Lead 3';
switch get(hObject,'Value')
case 0
set(hObject,'String','Start')
fprintf(handles.serConn, 'e');
case 1
set(hObject,'String','Stop')
set(handles.serConn, 'TImeout',2);
axes(handles.axeChannel1);
cla;
legend(legend1);
axis([min max yMin yMax]);
axis 'auto y' % moi them vao
grid(plotGrid);
hold on
li1=line(NaN,NaN);
axes(handles.axeChannel2);
cla;
legend(legend2);
axis([min max yMin yMax]);
axis 'auto y'
grid(plotGrid);
hold on
li2=line(NaN,NaN);
axes(handles.axeChannel3);
cla;
legend(legend3);
axis([min max yMin yMax]);
axis 'auto y'
grid(plotGrid);
hold on
li3=line(NaN,NaN);
fprintf(handles.serConn, 'E');
ei=0;
ecgdata=[0 0 0 0 0 0 0 0 0 0 0 0; 0 0 0 0 0 0 0 0 0 0 0 0];
end
tic
time1=0;
time2=0;
ecg1=[0];
ecg2=[0];
ecg3=[0];
x=[0];
while get(hObject,'Value')
data = fscanf(handles.serConn, '%s');
%count=100;
%maxloop=2;
%while((count>50)&&(maxloop>0))
% [data,count] = fscanf(handles.serConn, '%s');
% maxloop=maxloop-1;
%end
sa = str2num(data);
if(size(sa,2)>11)
ei=ei+1;
%ecgdata(ei,:)=sa;
ecgdata(ei,:)=[sa(1) 0.04185.*sa(2:9)-685.71 sa(10:12)];
if(get(handles.chkPlotECG,'Value'))
e1=sa(2);
e1=0.04185*e1-685.71;%1000*((e1/32768)-1/2)*4.8/3.5;
e2=sa(3);
e2=0.04185*e2-685.71;%1000*((e2/32768)-1/2)*2*2.4/3.5;
e3=e1-e2;
temp=sa(1)/1000;
x=[x temp];
ecg1 = [ecg1 e1];
ecg2 = [ecg2 e2];
ecg3 = [ecg3 e3];
if(temp-time1>=0.1)
time1=time2;
time2=temp;
set(li1,'XData',[get(li1,'XData') x], 'YData',[get(li1,'YData') ecg1]);
set(li2,'XData',[get(li2,'XData') x], 'YData',[get(li2,'YData') ecg2]);
set(li3,'XData',[get(li3,'XData') x], 'YData',[get(li3,'YData') ecg3]);
x=[];
ecg1=[];
ecg2=[];
ecg3=[];
if(time2>max)
set(handles.axeChannel1,'XLim',[(time2)-max time2]);
set(handles.axeChannel2,'XLim',[(time2)-max time2]);
set(handles.axeChannel3,'XLim',[(time2)-max time2]);
end
end
end
end
t=t+1;
pause(delay);
end
  2 个评论
Rik
Rik 2022-9-19
'when you're finished'
Did you close the figure window? How did you make sure the while loop exists properly before the object this callback refers to is destroyed?

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