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_mkdir, _wmkdir

Create a new directory.

int _mkdir(
   const char *dirname 
int _wmkdir(
   const wchar_t *dirname 


Path for new directory.

Return Value

Each of these functions returns the value 0 if the new directory was created. On an error the function returns –1 and sets errno as follows:

Directory was not created because dirname is the name of an existing file, directory, or device.
Path was not found.

See _doserrno, errno, _sys_errlist, and _sys_nerr for more information on these, and other, return codes.


The _mkdir function creates a new directory with the specified dirname. _mkdir can create only one new directory per call, so only the last component of dirname can name a new directory. _mkdir does not translate path delimiters. In Windows NT, both the backslash ( \) and the forward slash (/ ) are valid path delimiters in character strings in run-time routines.

_wmkdir is a wide-character version of _mkdir; the dirname argument to _wmkdir is a wide-character string. _wmkdir and _mkdir behave identically otherwise.

Generic-Text Routine Mappings

TCHAR.H routine _UNICODE & _MBCS not defined _MBCS defined _UNICODE defined
_tmkdir _mkdir _mkdir _wmkdir


Routine Required header Compatibility
_mkdir <direct.h> Win 98, Win Me, Win NT, Win 2000, Win XP
_wmkdir <direct.h> or <wchar.h> Win NT, Win 2000, Win XP

For additional compatibility information, see Compatibility in the Introduction.


All versions of the C run-time libraries.


// crt_makedir.c

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

int main( void )
   if( _mkdir( "\\testtmp" ) == 0 )
      printf( "Directory '\\testtmp' was successfully created\n" );
      system( "dir \\testtmp" );
      if( _rmdir( "\\testtmp" ) == 0 )
        printf( "Directory '\\testtmp' was successfully removed\n"  );
         printf( "Problem removing directory '\\testtmp'\n" );
      printf( "Problem creating directory '\\testtmp'\n" );

Sample Output

Directory '\testtmp' was successfully created
 Volume in drive C has no label.
 Volume Serial Number is E078-087A

 Directory of C:\testtmp

02/12/2002  09:56a      <DIR>          .
02/12/2002  09:56a      <DIR>          ..
               0 File(s)              0 bytes
               2 Dir(s)  15,498,690,560 bytes free
Directory '\testtmp' was successfully removed

See Also

Directory Control Routines | _chdir | _rmdir | Run-Time Routines and .NET Framework Equivalents