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Making an executable with input arguments using codegen

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I'm trying to compile a Matlab code using codegen and making an executable. The thing is that after compilation, I can't seem to successfully call the app from matlab along with the relevant input. I'll explain:
To make things simple, let's assume that the purpose of my program is to create a '.txt' file named 'my_text.txt' and print an input string inside, like so:
function PrintMyString(input_str) %#codegen
fid = fopen('my_text.txt','w');
fprintf(fid,'My input string is: %s',input_str);
fclose(fid);
end
Now, I tried to compile the code above using the following script:
str = 'pre_defining_the_input_variable_by_example';
codegen -config config_obj PrintMyString -args {str}
when config_obj is the code generation configuration defined somewhere earlier.
The compilation was successful, but as I mentioned before, when I tried to activate the program it didn't go as planned. I tried various options for calling, such as:
system(['PrintMyString.exe ',str]);
The text file was created, but no input string was printed (all that appeared was the line "My input string is: ").
I also tried adding a main function that calls the original PrintMyString function, like so:
function main() %#codegen
str = 'some_string';
PrintMyString(str);
end
I compiled it like that:
str = 'pre_defining_the_input_variable_by_example';
codegen -config config_obj main PrintMyString -args {str}
And that worked, but obviously it doesn't help because the input string has to be sent to the program from outside.
Any ideas? What am I doing wrong?

Accepted Answer

Titus Edelhofer
Titus Edelhofer on 4 Sep 2018
Hi,
it's probably not a question of the code generation but your main file: you compile to an executable, so probably your config_obj carries the information about the main file that you have to have. This main file should be able to take string input and pass it to the generated C code.
Maybe you can share your main file and we can take a look.
Titus
  5 Comments
Yuval Geyari
Yuval Geyari on 5 Sep 2018
It works great, thank you! Althougth I used a different input argument in the last line you mentioned:
main_PrintMyString(input_str);
And also, how exactly did you know to use the emxCreateWrapper_char_T function? It wasn't in the original example main.c file.

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