从C传递指针FORTRAN子程序 [英] Passing pointer from C to fortran Subroutine

问题描述

我想从C调用一个子程序FORTRAN，我可以分配在C和指针传递给Fortran的安全？在子程序中的数组是一个自动数组（X（n最大））。

I am trying to call a fortran subroutine from C, can I allocate in C and pass the pointer to Fortran safely? The array in the subroutine is an automatic array (x(nmax)).

（我分配的X，然后将它传递给FORTRAN）

(I am allocating the x and then passing it to the fortran)

推荐答案

是的。现代的Fortran保证Fortran例程可以从C和副-A-反之亦然调用。这是通过的Fortran ISO_C_BINDING完成。此为二○○三年Fortran语言的一部分，是广泛使用作为一个扩展到Fortran编译器95。有一个在gfortran手册（章节混合编程和内在模块）。作为一个语言功能的文档，此文档不仅仅是为gfortran编译器更加有用。也有这方面的例子在stackover，可以通过FORTRAN-ISO-C结合的标签上找到。

Yes. Modern Fortran guarantees that Fortran routines can be called from C and vice-a-versa. This is done via the Fortran ISO_C_BINDING. This is part of Fortran 2003 and was widely available as an extension to Fortran 95 compilers. There is documentation in the gfortran manual (Chapters "Mixed-Language Programming" and "Intrinsic Modules".) As a language feature, this documentation is more useful than just for the gfortran compiler. There are also examples here on stackover that can be found via the fortran-iso-c-binding tag.

简单code例如：

#include <stdio.h>
#include <stdlib.h>

void F_sub ( float * array_ptr );

int main ( void ) {

   float * array_ptr;

   array_ptr = malloc (8);

   F_sub (array_ptr);

   printf ( "Values are: %f %f\n", array_ptr [0], array_ptr [1] );

   return 0;
}

和

subroutine F_sub ( array ) bind (C, name="F_sub")

   use, intrinsic :: iso_c_binding
   implicit none

   real (c_float), dimension (2), intent (out) :: array

   array = [ 2.5_c_float, 4.4_c_float ]

end subroutine F_sub

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