We recommend using Visual Studio 2017
This documentation is archived and is not being maintained.

_mkdir, _wmkdir

Creates a new directory.

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


Path for a new directory.

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.

For more information about these and other return codes, see _doserrno, errno, _sys_errlist, and _sys_nerr.

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 and _MBCS not defined

_MBCS defined

_UNICODE defined






Required header




<direct.h> or <wchar.h>

For more 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" );

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