convert executable in dll

**ariesus** · 03-05-2019

Hello everybody,

I work usually with Fortran. We have a Fortran program that we want upgrade using a opensource program which is write in c. We want to convert it into dll that we can load that in our fortran application.
The main function of the c program is

Code:

int main( int argc, char **argv ){}

The c program is a command line tool. To computes the program, the usage is:

ProgramName <inputfile> <outputfile>

I have look a lot of manuals in internet about generate a dll in c/c++. I am not sure what I am doing is right or wrong.

I define a macro that declares the main function to be exported when building our dll-config, and not to be exported, when building the exe. like:

Code:

#ifdef DLLCONFIG
#define VIEW3D_API __declspec(dllexports)
#else
#define VIEW3D_API
#endif

VIEW3D_API int main(int argc, char **argv){
  return;
}

Is that correct?
Thanks,
Laura

**Salem** · 03-05-2019

Does Fortran have the ability to run another process?

Because that's probably the easiest way to go, where you do something like
system("programname infile outfile");

What opensource licence does the new program have? If your Fortran program is commercial, you need to be careful what you do.

**ariesus** · 03-26-2019

Originally Posted by Salem

Does Fortran have the ability to run another process?

In Fortran exist the possibility to run another process. Only for curiosity is correct the code that I wrote before?

Originally Posted by Salem

What opensource licence does the new program have? If your Fortran program is commercial, you need to be careful what you do.

The version of the opensource programm that we want use has a public domain licence. We already informed about the possibles problems with our commercial Fortran program.

**Salem** · 03-26-2019

Either of these.

As a DLL Function.

Code:

#ifdef DLLCONFIG
#define VIEW3D_API __declspec(dllexports)
#else
#define VIEW3D_API
#endif
 
VIEW3D_API int some_function(const char *infile, const char *outfile){
  return 0;
}

Or as a separate process.

Code:

int some_function(const char *infile, const char *outfile){
  return 0;
}

int main ( int argc, char *argv[] ) {
  return some_function(argv[1],argv[2]);
}

**flp1969** · 03-27-2019

I've never worked with FORTRAN. I wouldn't know how to declare an external SUBROUTINE and which calling convention to use.

The SysV ABI says something about interfacing C (gcc) and FORTRAN (gfortran)... You can download the specs here. But, most probably, it doesn't apply to Windows applications...

PS: The complete supplements for SysV ABI is here.

**ariesus** · 03-27-2019

Thank you for your reply I have learned something new for me.

Anyway, I have already implemented the command to run the opensource program in my fortran program.

Thanks again.

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