Variable must be a handle

Question

Quang Thinh 2013-9-5

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/86439-variable-must-be-a-handle

评论： linus Awuniji 2019-7-17

在 MATLAB Online 中打开

Hi guys

Currently working on GUI and stuff. I am learning a new command setappdata

I got stuck after this

PlotxE = plot([0 0]);
PlotvE = plot([0 0]);
PlotxV = plot([0 0]);
PlotvV = plot([0 0]);
hMainGui = getappdata(0, 'hMainGui');
%Set up data for storage
setappdata(hMainGui,'PlotxE',PlotxE);
setappdata(hMainGui,'PlotvE',PlotvE);
setappdata(hMainGui,'PlotxV',PlotxV);
setappdata(hMainGui,'PlotvV',PlotvV);

Basically, the error was

Error using setappdata
Value must be a handle.

Have been stuck and google around for good couple of hours. If someone can help me, that would be nice.

Regards,

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Vera 2013-9-20

@Jan: Thanks, it works now. My problem was, that I misunderstood the error message. I thought the problem was with the third input parameter because in doc this is called value. After I found out the problem is with the handle, it was fairly easy =)

linus Awuniji 2019-7-17

在 MATLAB Online 中打开

@ Jan, I am having a similar trouble to that you just adressed here. But Im still a bit lost, what do you mean by HANDLE OF MAIN GUI. I need to save imrect and access it in another call back where i can naipulate it

.

function Valiste_roi_Mic(hObject, eventdata, handles)
handles=guihandles;
getappdata(0, 'Microscope_Image')
 handles.imrect = imrect(gca, [0 0 50 50]);
 handles.imrect = getappdata(handles.imrect)
api = iptgetapi(handles.imrect);
api.addNewPositionCallback(@(p) title(mat2str(round(p))));
api.addNewPositionCallback(@(p) setappdata(0,'coordinates',p));
api.addNewPositionCallback(@(p) button_plot_Callback(hObject, eventdata, handles));
fcn = makeConstrainToRectFcn('imrect',...
    
get(gca,'XLim'),get(gca,'YLim'));
api.setPositionConstraintFcn(fcn);
% THIS IS THE PART YOU PROPOSED.
setappdata(0, 'handle.imrect', hamsteri_OpeningFcn)  