Fortran interface for a 2D array of C chars

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1

Given the following:

char filename[num1][num2];

What is the Fortran binding for this?

This:

character(len=num2, kind=c_char), dimension(num1) :: filename

gives the error:

Component 'filename' of BIND(C) type at (1) must have length one

2

Hi, I guess that is a two dimensional array? If yes, then

character(:), allocatable :: filename(:, :)
! I don't know what are you going to do with the array
! but Fortran is column major so we might save it as 
! (num2, num1) instead of (num1, num2).
allocate (character(len=50, kind=c_char) : filename(num2, num1))

where len represents the length of each array element.

3

If you want it to be the same as thing as the C variable

character(len=1, kind=c_char), dimension(num2,num1), bind(C, name='filename') :: filename

if you just want it to be interoperable with C, just leave of the bind(C...) part

4

Excellent. Thanks @everythingfunctional.
Yes, indeed, I do need it to be interoperable with C.