Error using icinterface/fopen (line 83) Unsuccessful open: OBJ has already been opened.

Hello i designed an APP how conect with a Industrial Camera.

it worked all fine until the last Days.

I got a Few errors ( shown Below)

I don't know why i get this Errors now, because i changend nothing. The software worked well before.

I think it is a connection problemwith the Camera. Maybe someone can help me.

If you need some more Codes tell me wich part you wanna see.

Thanks for your help.

The Errors

Warning: The specified amount of data was not returned within the Timeout period.

'tcpip' unable to read any data. For more information on possible reasons, see TCPIP Read Warnings.

Error using icinterface/fopen (line 83)

Unsuccessful open: OBJ has already been opened.

Error in ConStop (line 11)

fopen(t);

Error in GetMeasurements (line 25)

ConStop(t);

The code where i Connect the Camera:

% Button pushed function: scanButton

function scanButtonPushed(app, event)

if app.min_grau == 0 && app.max_grau == 0

message = 'Please create or load a grayscale profile first!';

uialert(app.GocatorInterfaceUIFigure , message , 'Fehler');

return

else

try

scanning = uiprogressdlg(app.GocatorInterfaceUIFigure,"Title",...

'scanning ...',"Indeterminate","on");

[app.xyz,app.graustufe] = GetSurface(GetMeasurements(app.r,app.tc),...

app.min_grau,...

app.max_grau,...

app.boden_max);

if app.scanmultipleobjectsCheckBox.Value == 1

app.graustufe_rs = multiZuschnitt(app.graustufe);

else

app.graustufe_rs = zuschneiden(app.graustufe);

end

app.bildpfad = DatenSpeichern(app.xyz,app.graustufe,app.graustufe_rs,...

app.createCSVfileCheckBox.Value,...

app.pfad);

close(scanning);

uialert(app.GocatorInterfaceUIFigure, 'Scan successfull!', '',"Icon","success");

catch

message = sprintf(['Error while transmitting data! \n Check Gocator' ...

' connections and scan settings.']);

uialert(app.GocatorInterfaceUIFigure , message , 'Error');

end

end

end

The Code where i start working with the Camera:

% Button pushed function:

% createandsavegrayscaleprofileButton

function createandsavegrayscaleprofileButtonPushed(app, event)

h = inputdlg('Object height?(mm)');

figure(app.GocatorInterfaceUIFigure)

h = str2double(h{1});

if isempty(h)

message = sprintf('No object height specified!');

uialert(app.GocatorInterfaceUIFigure , message , 'Error');

return

end

message = 'Please remove the Object from the scanned area and confirm with "OK"!';

bereit = uiconfirm(app.GocatorInterfaceUIFigure,message,'');

figure(app.GocatorInterfaceUIFigure)

bereit = strcmp(bereit,'OK');

if bereit

scanning = uiprogressdlg(app.GocatorInterfaceUIFigure,"Title",...

'scanning ...',"Indeterminate","on");

[app.xyz,app.graustufe] = GetSurface(GetMeasurements(app.r,app.tc),...

0,...

100000,...

0);

close(scanning);

app.boden_min = min(app.xyz(:,3));

app.boden_max = max(app.xyz(:,3));

if app.boden_max - app.boden_min > 2000

message = sprintf('Scanned surface uneven! Please adjust!');

uialert(app.GocatorInterfaceUIFigure , message , 'Error');

return

end

app.boden_max = app.boden_max + 1000;

app.min_grau = mean(app.xyz(:,3));

app.max_grau = app.min_grau + (h*1200);

[tmpfile,tmppfad] = uiputfile('*.mat');

tmpfullfile = strcat(tmppfad,tmpfile);

if tmpfile == 0

figure(app.GocatorInterfaceUIFigure)

uialert(app.GocatorInterfaceUIFigure, 'canceled', '');

return

end

val1 = app.min_grau;

val2 = app.max_grau;

val3 = app.boden_max;

save(tmpfullfile,'val1','val2','val3');

figure(app.GocatorInterfaceUIFigure)

uialert(app.GocatorInterfaceUIFigure, 'saved successfully!', '',"Icon","success");

else

figure(app.GocatorInterfaceUIFigure)

uialert(app.GocatorInterfaceUIFigure, 'canceled', '');

end

Answer 1

[Harald]

Hi,

it might be too late for the OP but in case others read this:

The error message indicates a connection that has not been closed properly. If you cannot figure out how to close it, the easiest is probably to restart MATLAB and in the worst case, your computer.

In general, when your code opens an interface, be sure to properly close it when you are done. For example inside functions, onCleanup can be helpful. For apps, this may be something to do in the CloseRequestFcn. Another approach could be try / catch.

Best wishes,

Harald