Try, Catch not working with system command.
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In my program I have the following block of code,
try
!"C:\Program Files\MATLAB\R2016b\bin\matlab.exe" -r "foo"
catch
warning('Directory was not found. Please locate the MATLAB R2016b installation.');
[f2016, d2016] = uigetfile('*.exe','Locate MATLAB R2016b Executable');
cmd = strcat('!"',d2016,f2016,'" -r "foo"');
eval(cmd);
end
When I run it normally, everything works fine. But when I alter the path in try to create an error, the catch is never executed. Instead the program terminates and I'm left with "The system cannot find the path specified". This text isn't displayed as an error which is probably the issue, but is there any way to make my try, catch work? Or at least a workaround?
采纳的回答
Walter Roberson
2017-11-14
I recommend converting to use system()
path_to_matlab = '"C:\Program Files\MATLAB\R2016b\bin\matlab.exe"';
try_again = true;
while try_again
try
cmd = sprintf('"%s" -r "foo"', path_to_matlab);
[status, result] = system(cmd);
if status == 0; try_again = false; end
catch ME
end
if try_again
warning('MATLAB was not found. Please locate the MATLAB R2016b installation.');
[f2016, d2016] = uigetfile('*.exe','Locate MATLAB R2016b Executable');
if isnumeric(f2016)
fprintf('Canceling');
break
end
path_to_matlab = fullfile(d2016, f2016);
end
end
It is not clear why you are starting a new MATLAB session ?
You should consider using
if ispc()
path_to_matlab = fullfile(matlabroot, 'bin', 'matlab.exe');
file_select_ext = '*.exe');
else
path_to_matlab = fullfile(matlabroot, 'bin', 'matlab');
file_select_ext = '*');
end
try_again = true;
while try_again
try
cmd = sprintf('"%s" -r "foo"', path_to_matlab);
[status, result] = system(cmd);
if status == 0; try_again = false; end
catch ME
end
if try_again
warning('MATLAB was not found. Please locate the MATLAB R2016b installation.');
[f2016, d2016] = uigetfile(file_select_ext, 'Locate MATLAB R2016b Executable');
if isnumeric(f2016)
fprintf('Canceling');
break
end
path_to_matlab = fullfile(d2016, f2016);
end
end
更多回答（1 个）
Fangjun Jiang
2017-11-14
编辑：per isakson
2017-11-14
use system() to replace the "!" to call your program.
[status,result] = system('command')
Use the returned "status" to determine your next step.
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