GetDiskFreeSpace

The GetDiskFreeSpace function retrieves information about the specified disk, including the amount of free space on the disk.

BOOL GetDiskFreeSpace(

LPCTSTR lpRootPathName,	// address of root path
LPDWORD lpSectorsPerCluster,	// address of sectors per cluster
LPDWORD lpBytesPerSector,	// address of bytes per sector
LPDWORD lpNumberOfFreeClusters,	// address of number of free clusters
LPDWORD lpTotalNumberOfClusters	// address of total number of clusters
);

Parameters

lpRootPathName

Points to a null-terminated string that specifies the root directory of the disk to return information about. If lpRootPathName is NULL, the function uses the root of the current directory.

lpSectorsPerCluster

Points to a variable for the number of sectors per cluster.

lpBytesPerSector

Points to a variable for the number of bytes per sector.

lpNumberOfFreeClusters

Points to a variable for the total number of free clusters on the disk.

lpTotalNumberOfClusters

Points to a variable for the total number of clusters on the disk.

Return Values

If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero. To get extended error information, call GetLastError.

Remarks

Windows 95:

The GetDiskFreeSpace function returns incorrect values for volumes that are larger than 2 gigabytes. The function caps the values stored into *lpNumberOfFreeClusters and *lpTotalNumberOfClusters so as to never report volume sizes that are greater than 2 gigabytes.

Even on volumes that are smaller than 2 gigabytes, the values stored into *lpSectorsPerCluster, *lpNumberOfFreeClusters, and *lpTotalNumberOfClusters values may be incorrect. That is because the operating system manipulates the values so that computations with them yield the correct volume size.

Windows 95 OSR 2: The GetDiskFreeSpaceEx function is available on Windows 95 systems beginning with OEM Service Release 2 (OSR 2). The GetDiskFreeSpaceEx function returns correct values for all volumes, including those that are greater than 2 gigabytes.

See Also

GetDiskFreeSpaceEx, GetDriveType

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