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HTTP/1.1 301 Moved Permanently Server: nginx Date: Thu, 24 Jul 2025 09:16:43 GMT Content-Type: text/html; charset=UTF-8 Transfer-Encoding: chunked Connection: keep-alive Location: /reference/cstdio/tmpfile/ HTTP/1.1 200 OK Server: nginx Date: Thu, 24 Jul 2025 09:16:43 GMT Content-Type: text/html; charset=utf-8 Transfer-Encoding: chunked Connection: keep-alive ETag: W/"80d9-xPVcxp46r9TfU1G+cer1Clelp04" Content-Encoding: gzip

TUTORIALS
REFERENCE
ARTICLES
FORUM

C++

Tutorials
Reference
Articles
Forum

Reference

C library:
- <cassert> (assert.h)
- <cctype> (ctype.h)
- <cerrno> (errno.h)
- C++11
  <cfenv> (fenv.h)
- <cfloat> (float.h)
- C++11
  <cinttypes> (inttypes.h)
- <ciso646> (iso646.h)
- <climits> (limits.h)
- <clocale> (locale.h)
- <cmath> (math.h)
- <csetjmp> (setjmp.h)
- <csignal> (signal.h)
- <cstdarg> (stdarg.h)
- C++11
  <cstdbool> (stdbool.h)
- <cstddef> (stddef.h)
- C++11
  <cstdint> (stdint.h)
- <cstdio> (stdio.h)
- <cstdlib> (stdlib.h)
- <cstring> (string.h)
- C++11
  <ctgmath> (tgmath.h)
- <ctime> (time.h)
- C++11
  <cuchar> (uchar.h)
- <cwchar> (wchar.h)
- <cwctype> (wctype.h)
Containers:
- C++11
  <array>
- <deque>
- C++11
  <forward_list>
- <list>
- <map>
- <queue>
- <set>
- <stack>
- C++11
  <unordered_map>
- C++11
  <unordered_set>
- <vector>
Input/Output:
- <fstream>
- <iomanip>
- <ios>
- <iosfwd>
- <iostream>
- <istream>
- <ostream>
- <sstream>
- <streambuf>
Multi-threading:
- C++11
  <atomic>
- C++11
  <condition_variable>
- C++11
  <future>
- C++11
  <mutex>
- C++11
  <thread>
Other:
- <algorithm>
- <bitset>
- C++11
  <chrono>
- C++11
  <codecvt>
- <complex>
- <exception>
- <functional>
- C++11
  <initializer_list>
- <iterator>
- <limits>
- <locale>
- <memory>
- <new>
- <numeric>
- C++11
  <random>
- C++11
  <ratio>
- C++11
  <regex>
- <stdexcept>
- <string>
- C++11
  <system_error>
- C++11
  <tuple>
- C++11
  <type_traits>
- C++11
  <typeindex>
- <typeinfo>
- <utility>
- <valarray>

<cstdio> (stdio.h)

functions
- clearerr
- fclose
- feof
- ferror
- fflush
- fgetc
- fgetpos
- fgets
- fopen
- fprintf
- fputc
- fputs
- fread
- freopen
- fscanf
- fseek
- fsetpos
- ftell
- fwrite
- getc
- getchar
- gets
- perror
- printf
- putc
- putchar
- puts
- remove
- rename
- rewind
- scanf
- setbuf
- setvbuf
- C++11
  snprintf
- sprintf
- sscanf
- tmpfile
- tmpnam
- ungetc
- vfprintf
- C++11
  vfscanf
- vprintf
- C++11
  vscanf
- C++11
  vsnprintf
- vsprintf
- C++11
  vsscanf
objects
- stderr
- stdin
- stdout
types
- FILE
- fpos_t
- size_t
macro constants
- BUFSIZ
- EOF
- FILENAME_MAX
- FOPEN_MAX
- L_tmpnam
- NULL
- TMP_MAX

Reference
<cstdio>
tmpfile

function

tmpfile

FILE * tmpfile ( void );

Open a temporary file

Creates a temporary binary file, open for update ("wb+" mode, see fopen for details) with a filename guaranteed to be different from any other existing file.

The temporary file created is automatically deleted when the stream is closed (fclose) or when the program terminates normally. If the program terminates abnormally, whether the file is deleted depends on the specific system and library implementation.

Parameters

none

Return Value

If successful, the function returns a stream pointer to the temporary file created.
On failure, NULL is returned.

Example

/* tmpfile example */
#include <stdio.h>
#include <string.h>
int main ()
{
  char buffer [256];
  FILE * pFile;
  pFile = tmpfile ();
  do {
    if (!fgets(buffer,256,stdin)) break;
    fputs (buffer,pFile);
  } while (strlen(buffer)>1);
  rewind(pFile);
  while (!feof(pFile)) {
    if (fgets (buffer,256,pFile) == NULL) break;
    fputs (buffer,stdout);
  }
  fclose (pFile);
  return 0;
}

This program creates a temporary file to store the lines entered by the user. When the user enters an empty line, the program rewinds the temporary file and prints its contents to stdout.

functions

objects

types

macro constants

tmpfile

Parameters

Return Value

Example

See also