Passing a FILE pointer by reference

madredcake (17)
Hi!
First the code:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
 
#include<stdio.h>

#define file "1.txt"
#define mode "w"

FILE* openfile( FILE *file_pointer ){
  file_pointer = fopen( file, mode );

  if( file_pointer == NULL )
    perror( "error" );
  printf( "success" );

  return file_pointer;
}

int main(){
  FILE *file_pointer;

  file_pointer = openfile( file_pointer );

  fprintf( file_pointer, "1" );

  fclose( file_pointer );
  return 0;
}

And now a question: How to do the same thing, while passing pointer to FILE (file_pointer) by reference?
hamsterman (4538)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
 
#include<stdio.h>

#define file "1.txt"
#define mode "w"

void openfile( FILE *& file_pointer ){
  file_pointer = fopen( file, mode );

  if( file_pointer == NULL )
    perror( "error" );
  printf( "success" );
}

int main(){
  FILE *file_pointer;

  openfile( file_pointer );

  fprintf( file_pointer, "1" );

  fclose( file_pointer );
  return 0;
}
madredcake (17)
Thanks.
1 more question: is there any solution for C ?

hamsterman (4538)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
 
#include<stdio.h>

#define file "1.txt"
#define mode "w"

void openfile( FILE ** file_pointer ){
  *file_pointer = fopen( file, mode );

  if( *file_pointer == NULL )
    perror( "error" );
  printf( "success" );
}

int main(){
  FILE *file_pointer;

  openfile( &file_pointer );

  fprintf( file_pointer, "1" );

  fclose( file_pointer );
  return 0;
}
Topic archived. No new replies allowed.