Check to see if a file exists with C++

Hi folks I need to check if a file exists in C++ but the solutions I found on the web didn't seem to work. Since I'm new at this any help with this would be great.
Cheers.
Rodric MacOliverResearcherAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

jkrCommented:
You can do that using 'stat()' (http://linux.die.net/man/2/stat) or '_stat()' (http://msdn.microsoft.com/en-us/library/14h5k7ff.aspx) if you are on Windows, e.g.

#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <errno.h>

int main( void )
{
   struct _stat buf;
   int result;
   char timebuf[26];
   char* filename = "crt_stat.c";
   errno_t err;

   // Get data associated with "crt_stat.c": 
   result = _stat( filename, &buf );

   // Check if statistics are valid: 
   if( result != 0 )
   {
      perror( "Problem getting information" );
      switch (errno)
      {
         case ENOENT:
           printf("File %s not found.\n", filename);
           break;
         case EINVAL:
           printf("Invalid parameter to _stat.\n");
           break;
         default:
           /* Should never be reached. */
           printf("Unexpected error in _stat.\n");
      }
   }
   else
   {
      // Output some of the statistics: 
      printf( "File size     : %ld\n", buf.st_size );
      printf( "Drive         : %c:\n", buf.st_dev + 'A' );
      err = ctime_s(timebuf, 26, &buf.st_mtime);
      if (err)
      {
         printf("Invalid arguments to ctime_s.");
         exit(1);
      }
      printf( "Time modified : %s", timebuf );
   }
}

Open in new window


(Code taken from the latter link)
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
trinitrotolueneDirector - Software EngineeringCommented:
On Windows you can also try the PathFileExists() API
http://msdn.microsoft.com/en-us/library/windows/desktop/bb773584(v=vs.85).aspx

If you are familiar with Boost which is my favourite then use the exists API
http://www.boost.org/doc/libs/1_49_0/libs/filesystem/v3/doc/tutorial.html#Using-status-queries
0
sarabandeCommented:
or '_stat()' (http://msdn.microsoft.com/en-us/library/14h5k7ff.aspx) if you are on Windows,
to add to comment of jkr:

windows allows using function name 'stat' instead of '_stat' as well. so the following is portable between windows and linux.

#include <sys/stat.h>
bool FileExists(const char * szpath)
{
      struct stat fs;
      return stat(szpath, &fs) == 0;
}

Open in new window


Sara
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
C++

From novice to tech pro — start learning today.