MATLAB: Getting error message while using try/catch

Question

That's why I coded a wrapper-function which tries to handle the error so that in case of a dropped frame, it simply get's captured again and doesn't abort the running code:

function img = getsnapshotfcn(obj, maxRetries, pausing)
    % Default args
    if(nargin < 3)
        pausing = 4; % in sec
    end
    if(nargin < 2)
        maxRetries = 20;
    end

    % Try to capture snapshot...
    i = 0;
    while(1)
        i = i+1;
        try
            img = getsnapshot(obj);

            % success? -> break loop
            break;
        catch err
            % Pause shortly before retry
            pause(pausing);
        end

        % maxRetries reached? -> error
        if(i > maxRetries)
            error('snapshot:maxRetriesReached', 'blaaa...');
        end
    end
end

When now using getsnapshotfcn() I'm sometimes still still getting the above posted error message shown in the console and I'm wondering why. I didn't expect the error to disappear (and please don't help me about this, I already know that I need to set the PacketDelay which I already did but in rare occasions it still happens even though running on a fast CPU) but I expected it to NOT being displayed as I expected it to simply be catched via try-catch.

What could be the case it's still being shown in the console? Thank you very much in advance.

Answer 1

I could solve it by using evalc in MATLAB using

evalc('img = getsnapshot(obj);')

instead of

img = getsnapshot(obj);

in the above code :-)