tmpnam, _wtmpnam
Remonter à Stdio.h - Index
Header File
stdio.h
Category
Input/output Routines
Prototype
char *tmpnam(char *s);
wchar_t *_wtmpnam(wchar_t *s);
Description
Creates a unique file name.
tmpnam creates a unique file name, which can safely be used as the name of a temporary file. tmpnam generates a different string each time you call it, up to TMP_MAX times. TMP_MAX is defined in stdio.h as 65,535.
The parameter to tmpnam, s, is either null or a pointer to an array of at least L_tmpnam characters. L_tmpnam is defined in stdio.h. If s is NULL, tmpnam leaves the generated temporary file name in an internal static object and returns a pointer to that object. If s is not NULL, tmpnam overwrites the internal static object and places its result in the pointed-to array, which must be at least L_tmpnam characters long, and returns s.
If you do create such a temporary file with tmpnam, it is your responsibility to delete the file name (for example, with a call to remove). It is not deleted automatically. (tmpfile does delete the file name.)
Return Value
If s is null, tmpnam returns a pointer to an internal static object. Otherwise, tmpnam returns s.
Example
#include <stdio.h>
int main(void)
{
char name[13];
tmpnam(name);
printf("Temporary name: %s\n", name);
return 0;
}
Portability
POSIX | Win32 | ANSI C | ANSI C++ | |
---|---|---|---|---|
tmpnam |
+ |
+ |
+ |
+ |
_wtmpnam |
+ |