We sometimes need some information for logical disks in the system, such as disk scroll, disk serial number, space size, remaining space, etc., which are clearly unable to obtain functions provided by VB. However, with the support of the VB on the Windows API function, use the GetVolumeInformation and getDiskFreespace, we can easily get information about the disk.
Let's talk about these two functions. The GetVolumeInformation function is used to obtain information related to a disk volume, including the disk scroll, the serial number of the disk, "/" and "/" in the full path of the file "/" and the name of the file system and the file system Some features. The GetDiskFreespace function is used to obtain information related to a disk organization, as well as the capacity of the remaining space, including the total cluster number on the disk, the number of remaining clusters, the number of sectors in a cluster, and the number of bytes in one sector.
Next, look at the specific example.
Enter VB, add a driver list box (DriveStbox) and a list box (Listbox) on the form, then add the following script:
Option expedition
Private Declare Function GetVolumeInformation
LIB "kernel32" alias
GetVolumeInformationa (Byval LPROOTPATHNAME AS)
String, ByVal LPVoluMenameBuffer AS
String, Byval NVoluMenamesize As Long,
LPVOLUMESERIALNUMBER AS Long,
LPMAXIMUMComponentlength as long,
Lpfilesystemflags as long, byval
LPFILESYSTEMNAMEBUFFER AS STRING,
BYVAL NFILESYSTEMNAMESIZE As long
Private Declare Function GetDiskFreespace
LIB "kernel32" Alias "getDiskFreespacea"
(Byval LPROOTPATHNAME AS STRING, LPSECTORSPERCLUSTER
As Long, LPBYTESPERSECTOR As Long,
LPNumberoffreeClusters as long,
LPTOTOTAALNUMBEROFCLUSTERS AS Long AS Long
Private const fs_case_is_preserved = & h2
Private const fs_case_sensitive = & h1
Private const fs_unicode_stored_on_
Disk = & h4
Private const fs_persistent_acls = & h8
Private const fs_file_compression = & h10
PRIVATE const fs_vol_is_compressed =
& H8000
Private sub Drive1_change ()
DIM Volume as string, sysname as string
DIM Serialnum as long, sysflags as long,
ComponentLength As Long, RES As Long
Dim SectorsperCluster As Long, Bytespersector
As Long, NumberoffreeClustors AS
Long, TotalNumberofclustors As Longdim FreeBytes As Long, Totalbytes As long,
Percentfree As Long, DL As Long
Dim Drvname As String
List1.clear
Volume = String (256, 0)
Sysname = String (256, 0)
DRVNAME = Left (drive1.drive, 2) & "/"
Res = GetVolumeInformation (drvname,
Volume, 255, serialnum, _
ComponentLength, Sysflags, Sysname, 255)
IF res = 0 THEN
List1.additem "Cannot get disk information"
Else
List1.additem "Volume:" & Trim (Volume)
List1.additem "Serial Number:" & Serialnum
List1.additem "ingredient length:" & ComponentLength
List1.additem file system: "& Trim (sysname)
DL = GetDiskFreespace (drvname,
SectorsperCluster, Bytespersector,
NumberoffreeClustors, TotalNumberOfClustors
List1.additem "The number of sectors per cluster:"
& Format (SectorsperCluster, "#, 0")
List1.additem "Number of bytes per area:"
& Format (Bytespersector, "#, 0")
List1.additem "total cluster number:"
& Format (TotalNumberofclustors, "#, 0")
List1.additem "Remaining Clusters:"
& Format (NumberoffreeClustors, "#, 0")
Totalbytes = TotalNumberOfClustors *
SectorsperCluster * bytespersector
List1.additem "total byte number:
"& Format (Totalbytes," #, 0 ")
FreeBytes = NumberoffreeClustors
* SectorsperCluster * bytespersector
List1.additem "Remaining bytes:"
& Format (FreeBytes, "#, 0")
IF sysflags and fs_case_is_preserved then
List1.additem "file name size records on file system"
END IF
IF sysflags and fs_case_sensitive the
List1.additem "file name to be case sensitive"
END IF
IF sysflags and fs_unicore_stored_
ON_DISK THEN
List1.additem "File Name Save as Unicode Format"
END IF
IF sysflags and fs_persistent_aclsim
List1.additem "File System Support Document Access
Control List (ACL) Security Mechanism "END IF
IF sysflags and fs_file_compression then
List1.additem "file system supports file compression in file"
END IF
IF sysflags and fs_vol_is_compressed the
List1.additem "The entire disk volume is compressed"
END IF
END IF
End Sub
Private sub flow_load ()
Call drive1_change
End Sub
After running, select the different drive in the Drive List box, and the corresponding information of the drive will be displayed. The above procedures run in VB5.0, VB6.0, and Windows 98.
Reprinted from Computer World Daily (Text / Strict Winter)
