CODEWITHSUNDEEP
cfile-io
Lazer
Lazer

Reputation: 94810

How can I delete a file pointed to by a FILE* in C?

#include<stdio.h>

int main() {

    FILE* fp;
    fp = fopen("temp.txt", "w");
    fprintf(fp, "Hello, World!\n");

    // remove("temp.txt");  this requires the filename as an argument
    // removefile(fp);      <--- is something like this possible?

    return 0;
}

The remove function (defined in stdio.h) takes the file name as a parameter, but not the file pointer itself.

Is there some function in the C standard libraries that does file deletion, and takes file pointer as the arguement?

Upvotes: 6

Views: 6129

Answers (5)

Svisstack
Svisstack

Reputation: 16616

You closed pointer, then her value was freed, how you imagine delete file by this handle?

Upvotes: 1

user414441
user414441

Reputation:

You may want to use the 'FILE * tmpfile(void)' function from stdlib.

from the man:

DESCRIPTION

The tmpfile() function shall create a temporary file and open a corresponding stream. The file shall be automatically deleted when all references to the file are closed. The file is opened as in fopen() for update (w+).

In some implementations, a permanent file may be left behind if the process calling tmpfile() is killed while it is processing a call to tmpfile().

An error message may be written to standard error if the stream cannot be opened.

Upvotes: 7

Andrey
Andrey

Reputation: 60065

No, you can't. And FILE struct doesn't include filename inside it. So best option is to have structure that will both hold pointer to FILE and to char* with name

Upvotes: 1

David Gelhar
David Gelhar

Reputation: 27900

I don't believe there's any way to do this, because a FILE* may not necessarily correspond to a file in the filesystem at all (For example, stdin and stdout).

And in filesystems that support hard links, there can be multiple paths referring to the same underlying file, which one would you want it to remove?

Upvotes: 8

Bart van Ingen Schenau
Bart van Ingen Schenau

Reputation: 15768

No, there isn't (unfortunately).

Upvotes: 1

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