Holding matlab execution while dos/system command is running
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olu
el 20 de Abr. de 2014
Comentada: Theodore Bantounas
el 12 de Nov. de 2020
Hi all,
Z (see code below) is a batch file to be executed using 'dos'. The challenge however is that V requires 'x.log' which is an output files after completely executing the batch file. What I observe is error message saying that the output file do not exist; apparently because the 'x.log' is yet to be generated by the batch file. Please How can I make matlab hold on until after the batch file has been completed so that the x.log file can be available as input to V?
z = dos('x.bat'); v = fileread('x.log')
Thank you in advance.
OlFat
0 comentarios
Respuesta aceptada
Image Analyst
el 20 de Abr. de 2014
Maybe you can enter a loop until it's created
z = dos('x.bat');
% Wait for file to be created.
maxSecondsToWait = 100; % Wait 100 seconds at most.
secondsWaitedSoFar = 0;
while secondsWaitedSoFar < maxSecondsToWait
if exist('x.log', 'file')
break;
end
pause(1); % Wait 1 second.
secondsWaitedSoFar = secondsWaitedSoFar + 1;
end
if exist('x.log', 'file')
v = fileread('x.log')
else
warningMessage = sprintf('Warning: x.log never got created after waiting %d seconds', secondsWaitedSoFar);
uiwait(warndlg(warningMessage));
end
4 comentarios
Image Analyst
el 7 de Sept. de 2020
It will break from the loop as soon as the file is detected - 10 seconds in your example. By the way, instead of exist(), this is how you do it now:
if isfile('x.log')
Más respuestas (1)
Walter Roberson
el 20 de Abr. de 2014
dos() does wait for the end of the command. However if the command involves opening up an independent graphics window instead of working in command-line mode, then as far as MS Windows is concerned the .bat is finished. There are tools that can be used to detect whether a process is executing if necessary.
1 comentario
Devalla lakshmipathirao
el 7 de Sept. de 2020
Could you please tell more about the tools you are talking about? Thanks.
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