_chdrive

Changes the current working drive.

int _chdrive( int drive );

For additional compatibility information, see Compatibility in the Introduction.

Libraries

Return Value

_chdrive returns a value of 0 if the working drive is successfully changed. A return value of  –1 indicates an error.

Parameter

drive

Number of new working drive

Remarks

The _chdrive function changes the current working drive to the drive specified by drive. The drive parameter uses an integer to specify the new working drive (1=A, 2=B, and so forth). This function changes only the working drive; _chdir changes the working directory.

Example

/* GETDRIVE.C illustrates drive functions including:
 *      _getdrive       _chdrive        _getdcwd
 */

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

void main( void )
{
   int ch, drive, curdrive;
   static char path[_MAX_PATH];

   /* Save current drive. */
   curdrive = _getdrive();

   printf( "Available drives are: \n" );

   /* If we can switch to the drive, it exists. */
   for( drive = 1; drive <= 26; drive++ )
      if( !_chdrive( drive ) )
         printf( "%c: ", drive + 'A' - 1 );

   while( 1 )
   {
      printf( "\nType drive letter to check or ESC to quit: " );
      ch = _getch();
      if( ch == 27 )
         break;
      if( isalpha( ch ) )
         _putch( ch );
      if( _getdcwd( toupper( ch ) - 'A' + 1, path, _MAX_PATH ) != NULL )
         printf( "\nCurrent directory on that drive is %s\n", path );
   }

   /* Restore original drive.*/
   _chdrive( curdrive );
   printf( "\n" );
}

Output

Available drives are:
A: B: C: L: M: O: U: V: 
Type drive letter to check or ESC to quit: c
Current directory on that drive is C:\CODE

Type drive letter to check or ESC to quit: m
Current directory on that drive is M:\

Type drive letter to check or ESC to quit: 
 

Directory Control Routines

See Also   _chdir, _fullpath, _getcwd, _getdrive, _mkdir, _rmdir, system