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Check if the directory exists or not.

I am trying to check if a directory exists using Fortan90. On different sites, I found:

logical :: dir_e
inquire(file='./docs/.', exist=dir_e)

if ( dir_e ) then
  write(*,*) "dir exists!"
else
  ! workaround: it calls an extern program...
  call system('mkdir docs')
end if

However, it inquirereturns Falsewhether the directory exists or not, and if I execute this code twice, I get an error

can't make dir, file already exists

If I use:

inquire(file='./docs/test', exist=dir_e)

with an existing test file, inquirereturns true.

How to check catalog availability? I am using ubuntu 11.04 and the ifort compiler.

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7 answers

The following should work:

INQUIRE (DIRECTORY=dir, EXIST=ex [, DIRSPEC=dirspec] [, ERR=label] [, IOSTAT=i-var] )

I do not have ifort on this machine, so I can not test it.

: , gfortran. DIRECTORY ifort, gfortran.

: http://software.intel.com/sites/products/documentation/hpc/compilerpro/en-us/fortran/win/compiler_f/lref_for/source_files/rfinquir.htm#rfinquir

+5

Fortran 95, 2003 2008 , . Linux, gfortran , ifort - . ifort .

.

+4

, , - . . , .

     CALL system("mkdir video")
     CALL chdir("video")
     CALL getcwd(path)
+3

C- :

C ( ifort gfortran Win32 Linux 32/64)

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <sys/stat.h>
#if defined(_WIN32) && defined(__INTEL_COMPILER)
#  include "dirent_windows.h"
#else
#  include <dirent.h>
#endif

void file_info(const char*filename,int*mode,int*exist,int*time){
  int k;
  struct stat buf;
  k=stat(filename,&buf);
  if(k != 0) {
    *mode=0;
    *exist=0;
    *time=0;
  }else{
    *mode=buf.st_mode;
    if(*mode == 0) *exist=0; else *exist=1;
    *time=buf.st_mtime;
  }
}

:

MODULE file

  USE iso_c_binding

  INTERFACE
    SUBROUTINE file_info(filename,mode,exist,time) BIND(C,name="file_info")
      USE iso_c_binding
      CHARACTER(kind=C_CHAR),INTENT(in) :: filename(*)
      INTEGER(C_INT),INTENT(out) :: mode,exist,time
    END SUBROUTINE
  END INTERFACE

END MODULE

Fortran:

..
use file
use iso_c_binding
...
integer(c_int) :: mode,exist,time
...
call file_info("./docs"//char(0),mode,exist,time)

: , ( //) .

+1

- ​​ , :

subroutine create_directory( newDirPath )
    ! Author:  Jess Vriesema
    ! Date:    Spring 2011
    ! Purpose: Creates a directory at ./newDirPath

    implicit none

    character(len=*), intent(in) :: newDirPath
    character(len=256)           :: mkdirCmd
    logical                      :: dirExists

    ! Check if the directory exists first
!   inquire( file=trim(newDirPath)//'/.', exist=dirExists )  ! Works with gfortran, but not ifort
    inquire( directory=newDirPath, exist=dirExists )         ! Works with ifort, but not gfortran


    if (dirExists) then
!      write (*,*) "Directory already exists: '"//trim(newDirPath)//"'"
    else
        mkdirCmd = 'mkdir -p '//trim(newDirPath)
        write(*,'(a)') "Creating new directory: '"//trim(mkdirCmd)//"'"
        call system( mkdirCmd )
    endif
end subroutine create_directory

, , , .

, nagfor , .

0

. , , . open ( err =), open:

! Tests whether the directory exists
subroutine checkdir(dir)
       implicit none
       character(len=*), intent(in) :: dir
       integer :: unitno

       ! Test whether the directory exists
       open(newunit=unitno,file=trim(dir)//'deleteme.txt',status='replace',err=1234)
       close (unitno)
       return

       ! If doesn't exist, end gracefully
1234   write(*,*) 'Data directory, '//trim(dir)//' does not exist or could not write there!'
       STOP

end subroutine

, , , "dir" "/" "\" .

0

- (Bash ) :

call system('[[ ! -e docs ]] && mkdir docs')
0

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