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tmpfile

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< c‎ | io
Revision as of 05:31, 2 May 2014 by Newatthis (Talk | contribs)

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Defined in header <stdio.h>
FILE *tmpfile();

Opens a temporary file. The file is opened as binary file for update ("wb+ mode). The filename of the file is guaranteed to be unique within the filesystem.

The file will be closed when the program exits.

Contents

[edit] Parameters

(none)

[edit] Return value

The associated file stream or NULL if an error has occurred

[edit] Example

tmpfile with error checking. Code opens a temporary file with mode "wb+".

#include <stdio.h>
#include <stdlib.h>
 
int main(void)
{
    FILE* tmpf = tmpfile();   /* mode: "wb+" */
    if (tmpf == NULL)
    {
       perror("tmpfile()");
       fprintf(stderr,"tmpfile() failed in file %s at line # %d", __FILE__,__LINE__-4);
       exit(EXIT_FAILURE);
    }
    fputs("Hello, world", tmpf);
    rewind(tmpf);
    char buf[6];
    fgets(buf, sizeof buf, tmpf);
    printf("%s\n", buf);
 
    return EXIT_SUCCESS;
}

Output:

Hello

[edit] See also

returns a unique filename
(function) [edit]
C++ documentation for tmpfile