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ErrorOccurred Event

Notify when device-related errors occur


lh = addlistener(session,'ErrorOccurred',callback);
lh = addlistener(session,'ErrorOccurred',@(src,event) expr);


lh = addlistener(session,'ErrorOccurred',callback); creates a listener for the ErrorOccurred event. When an error occurs, the callback is executed. The callback can be any MATLAB® function with the (src,event) signature.

lh = addlistener(session,'ErrorOccurred',@(src,event) expr); creates a listener for the ErrorOccurred event and fires an anonymous function. The anonymous function requires the specified input arguments and executes the operation specified in the expression expr. Anonymous functions provide a quick means of creating simple functions without requiring that your function in stored in a file. For more information, see Anonymous Functions (MATLAB).

The callback has two required parameters: src and event. src is the session object for the listener, and event is a daq.ErrorOccurredInfo object. The daq.ErrorOccurredInfo object contains the Error property, which is the MException associated with the error. You can use the MException.getReport method to return a formatted message that uses the same format as errors thrown by internal MATLAB code.


In background mode, errors and exceptions are not displayed by default. Use the ErrorOccurred event listener to display the errors.


Create a session, and add an analog input channel:

s = daq.createSession('ni');

Get a formatted report of the error:

lh = addlistener(s,'ErrorOccurred',@(src,event) disp(getReport(event.Error)));

Acquire data, wait, and delete the listener:


See Also



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