Syntax

#include <stdio.h>
FILE *tmpfile(void);

tmpfile creates a temporary binary file. The file is automatically removed when it is closed or when the program is terminated.

tmpfile opens the temporary file in wb+ mode.

tmpfile returns a stream pointer, if successful. If it cannot open the file, it returns a NULL pointer. On normal termination (exit), these temporary files are removed.

This example creates a temporary file, and if successful, writes tmpstring to it. At program termination, the file is removed.

#include <stdio.h>
#include <stdlib.h>

FILE *stream;
char tmpstring[] = "This is the string to be temporarily written";

int main(void)
{
   if (NULL == (stream = tmpfile())) {
      perror("Cannot make a temporary file");
      return EXIT_FAILURE;
   }
   else
      fprintf(stream, "%s", tmpstring);
   return 0;
}

• fopen
  
• tmpnam
  
• tempnam
  
• rmtmp

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