readstruct getting error when attempt to run function in background

I have reduced down a function that I want to run in the background. When run as a background process, I get the error message back

>> [result] = fetchOutputs(WatchID); result

Error using parallel.Future/fetchOutputs

One or more futures resulted in an error.

Caused by:

Error using readstruct (line 72)

Use of function cd is not supported on a thread-based worker. Use alternatives supported on the background pool.

The function code follows:

function [resultBack] = BruteForceWrapper(inputStr)

%This is a brute force loop for the PhoneProcessWatcher

%Trying to launch it in the background but getting errors so doing brute

%force

resultBack = 'Starting';

systemXmlPath = 'D:\ThisSystem';

systemStruct = readstruct(fullfile( systemXmlPath,'Configuration.xml'));

debugLevel = systemStruct.ImageProcess.DebugLevel;

end

Code that is launching as background is below

WatchID = parfeval( backgroundPool, @BruteForceWrapper, 1, 'just text' );

Is this occuring with the readstruct as a background function? Is there an alternative that will work in a background run function?

Answer 1

[Rik]

Apparently it calls cd somewhere internally.

You could try reading the file will xmlread and parse to a struct with parseXML. I didn't try myself, so I don't know if that would result in the same problem.