How do I pass arguments into and out of my standalone executable?

I want to be able to pass input and output arguments to my standalone application when I bang out to the DOS shell from MATLAB.

Answer 1

[MathWorks Support Team]

Please refer the below documentation link:

https://www.mathworks.com/help/compiler/working-with-standalone-applications-and-arguments.html

Answer 2

[Antti]

Note that in R2017b (and possibly beyond) on Windows 10, no output is printed on the Windows command prompt unless you uncheck "Do not display the Windows command shell (console) for execution" under "Additional runtime settings" in the Application Compiler tool of MATLAB Compiler.

Answer 3

[Iaroslav Linder]

Finally found a solution how to input and output variables in generated executables. Here is the example (Name the script main.m)

function out=main()
num=0; %this converts to double
if coder.target('MATLAB')
num=input("Enter number");
else
coder.ceval('scanf','%lf',coder.ref(num)); % not '%f'
end
fprintf(1,'The squared value is %f\n',sqrt(double(num)));
out=int32(0);
end

[Iaroslav Linder]

with strings, it can be tricky, so another example

function out=main()
num=char(zeros(100,1));
coder.ceval('scanf','%s',coder.ref(num));
fprintf(1,"The string is %s",num)
out=int32(0);
end

[Iaroslav Linder]

it is even possible to let executable file accept command line arguments. But it requires a little trick to set the type of the second argument as the structure (struct 1 x:50) of type (char*)

function out=main(argc, argv)
fprintf(1,"Number of args %d\n",argc)
X_sum=complex(0);
for i=1:argc
tmp=char(zeros(1,100));
coder.ceval("strcpy",coder.ref(tmp),argv(i));
X = str2double(tmp);
if (imag(X)~=0||real(X)~=0)
fprintf(1,'%lf \n',X)
X_sum=X_sum+X;
end
end
fprintf(1,'Summ %lf \n',X_sum)
out=int32(0);
end

Answer 4

[Steve Lim]

The examples show how to specify the input parameters to launch an application (exe). Within the application, what's the MATLAB source code look like to get the input parameter strings?

Thank you.

[Walter Roberson]

Depending on whether you are expecting scalars or not, str2double() or use some sscanf() or even textscan() on the string. (You can pass a string as the first parameter to textscan to have it read, instead of passing a file identifier there.)

Answer 5

[Ewen Chan]

Sorry for resurrecting a super old thread, but I have a question about this:

So in the script that I have now, at the start of it, I have declared some variables and assigned them values.

e.g.:

c0 = 3;
c1 = 100;
c2 = 500;
pi = 0.1;
p = 0.05;
N = 650;
e1 = 0.001;
e2 = 0.001;

If I want to create a standalone application, so that I can vary the numbers for those variables, how would I go about doing that?

Do I use the Application Compiler?

And if so, how do I go about doing that? This is my first attempt at a) trying to compile a standalone application and b) trying to pass input arguments that will change the variables that is currently at the top of my script/code.

Any help would be greatly appreciated.

Thank you.

[Walter Roberson]

You would use MATLAB Compiler.

If you wanted the user to be able to set selective values then you might have an interface that looked something like

function MyMain(varargin)
  v.c0 = 3;
  v.c1 = 100;
  v.c2 = 500;
  v.pi = 0.1;
  v.p = 0.05;
  v.N = 650;
  v.e1 = 0.001;
  v.e2 = 0.001;
  known_vars = fieldnames(v);

    if mod(nargin,2) ~= 0
      error('Expecting an even number of arguments');
    end

    for idx = 1 : 2 : nargin-1
      if ~ismember(varargin{idx}, known_vars)
        error('Argument "%s" is not a variable name I know', varargin{idx});
      end
      val = str2double(varargin{idx+1});
      if isnan(val)
         error('Value "%s" for variable "%s" is not a numeric scalar', varargin{idx+1}, varargin{idx});
       end
       v.(varargin{idx}) = val;
     end

That is, the user would call the executable with alternating variable names and numeric scalars on the command line, such as

   MyMain.exe c2 750 e1 0.025

[Ewen Chan]

Ahhh...okay.

I'll try that. Thank you.

[Kristen Lancaster]

Did you get it working? Could anyone provide input on my attempts to use command line arguments with a standalone created with MATLAB Coder?

https://www.mathworks.com/matlabcentral/answers/443145-matlab-coder-with-command-line-parameters