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_getdiskfree

Uses information about a disk drive to populate a _diskfree_t structure.

Important note Important

This API cannot be used in applications that execute in the Windows Runtime. For more information, see CRT functions not supported with /ZW.

unsigned _getdiskfree(
   unsigned drive,
   struct _diskfree_t * driveinfo
);

[in] drive

The disk drive for which you want information.

[out] driveinfo

A _diskfree_t structure that will be populated with information about the drive.

If the function succeeds, the return value is zero. If the function fails, the return value is the error code. The value errno is set for any errors that are returned by the operating system. For more information about error conditions that are indicated by errno, see errno Constants.

The _diskfree_t structure is defined in Direct.h.

struct _diskfree_t { 
   unsigned total_clusters; 
   unsigned avail_clusters; 
   unsigned sectors_per_cluster; 
   unsigned bytes_per_sector; 
};

This function validates its parameters. If the driveinfo pointer is NULL or drive specifies an invalid drive, this function invokes an invalid parameter handler, as described in Parameter Validation. If execution is allowed to continue, the function returns EINVAL and sets errno to EINVAL. Valid drives range from 0 to 26. A drive value of 0 specifies the current drive; thereafter, numbers map to letters of the English alphabet such that 1 indicates drive A, 3 indicates drive C, and so on.

total_clusters

The total number of clusters, both used and available, on the disk.

avail_clusters

The number of unused clusters on the disk.

sectors_per_cluster

The number of sectors in each cluster.

bytes_per_sector

The size of each sector in bytes.

Routine

Required header

_getdiskfree

<direct.h>

For more compatibility information, see Compatibility.

// crt_getdiskfree.c
// compile with: /c
#include <windows.h>
#include <direct.h>
#include <stdio.h>
#include <tchar.h>

TCHAR   g_szBorder[] = _T("======================================================================\n");
TCHAR   g_szTitle1[] = _T("|DRIVE|TOTAL CLUSTERS|AVAIL CLUSTERS|SECTORS / CLUSTER|BYTES / SECTOR|\n");
TCHAR   g_szTitle2[] = _T("|=====|==============|==============|=================|==============|\n");
TCHAR   g_szLine[]   = _T("|  A: |              |              |                 |              |\n");

void utoiRightJustified(TCHAR* szLeft, TCHAR* szRight, unsigned uVal);

int main(int argc, char* argv[]) {
   TCHAR szMsg[4200];
   struct _diskfree_t df = {0};
   ULONG uDriveMask = _getdrives();
   unsigned uErr, uLen, uDrive;

   printf(g_szBorder);
   printf(g_szTitle1);
   printf(g_szTitle2);

   for (uDrive=1; uDrive<=26; ++uDrive) {
      if (uDriveMask & 1) {
         uErr = _getdiskfree(uDrive, &df);
         memcpy(szMsg, g_szLine, sizeof(g_szLine));
         szMsg[3] = uDrive + 'A' - 1;

         if (uErr == 0) {
            utoiRightJustified(szMsg+8,  szMsg+19, df.total_clusters);
            utoiRightJustified(szMsg+23, szMsg+34, df.avail_clusters);
            utoiRightJustified(szMsg+38, szMsg+52, df.sectors_per_cluster);
            utoiRightJustified(szMsg+56, szMsg+67, df.bytes_per_sector);
         }
         else {
            uLen = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL,
                            uErr, 0, szMsg+8, 4100, NULL);
            szMsg[uLen+6] = ' ';
            szMsg[uLen+7] = ' ';
            szMsg[uLen+8] = ' ';
         }

         printf(szMsg);
      }

      uDriveMask >>= 1;
   }

   printf(g_szBorder);
}

void utoiRightJustified(TCHAR* szLeft, TCHAR* szRight, unsigned uVal) {
   TCHAR* szCur = szRight;
   int nComma = 0;

   if (uVal) {
      while (uVal && (szCur >= szLeft)) {
         if   (nComma == 3) {
            *szCur = ',';
            nComma = 0;
         }
         else {
            *szCur = (uVal % 10) | 0x30;
            uVal /= 10;
            ++nComma;
         }

         --szCur;
      }
   }
   else {
      *szCur = '0';
      --szCur;
   }

   if (uVal) {
      szCur = szLeft;

      while   (szCur <= szRight) {
         *szCur = '*';
         ++szCur;
      }
   }
}
======================================================================
|DRIVE|TOTAL CLUSTERS|AVAIL CLUSTERS|SECTORS / CLUSTER|BYTES / SECTOR|
|=====|==============|==============|=================|==============|
|  A: | The device is not ready.    |                 |              |
|  C: |    4,721,093 |    3,778,303 |               8 |          512 |
|  D: |    1,956,097 |    1,800,761 |               8 |          512 |
|  E: | The device is not ready.    |                 |              |
======================================================================

Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.

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