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Tip of the Day
Language: C++
Expertise: Intermediate
Nov 6, 2000

Generating a Unique Filename

To generate a unique filename that won't conflict with any other files that exist in the current directory, use the tmpnam() function declared in <stdio.h> as follows:

 
char * tmpnam(char * name);

The function generates a unique name that may contain up to L_tmpnam characters. You can call tmpnam() up to TMP_MAX (the TMP_MAX and L_tmpnam constants are defined in <stdio.h>) times without generating repeated names. For example:

 
#include <cstdio>
#include <iostream>
using namespace std;
int main()
{
 char name[L_tmpnam];
 for (int n=0; n<TMP_MAX; ++n)
 {
  tmpnam(name);
  cout << name << endl;
 }
}
Danny Kalev
 
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