VB中获取逻辑磁盘的信息
我们在编程的时候有时会需要得到系统中逻辑磁盘的一些信息，如磁盘卷标、磁盘序列号、空间大小、剩余空间等，这些信息直接使用VB提供的函数显然是无法得到的。但是，借助于VB对WINDOWS API函数的支持，使用GetVolumeInformation和GetDiskFreeSpace这两个API函数，我们就可以很容易的得到磁盘的相关信息。
先来谈谈这两个函数。GetVolumeInformation函数用于获取与一个磁盘卷有关的信息，包括磁盘卷标、磁盘的序列号、文件的全路径名中“\”与“\”之间部分的长度、文件系统的名称以及文件系统的某些特性。GetDiskFreeSpace函数用于获取与一个磁盘组织有关的信息，以及了解剩余空间的容量，包括磁盘上的总簇数、剩余簇数、一个簇内的扇区数和一个扇区内的字节数。
接下来看看具体的例子。
进入VB中，在窗体上加入一个驱动器列表框（DriveListBox）和一个列表框（ListBox），然后加入以下的脚本：
Option Explicit
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) As Long
Private Declare Function GetDiskFreeSpace Lib "kernel32" Alias "GetDiskFreeSpaceA"
(ByVal lpRootPathName As String, lpSectorsPerCluster As Long, lpBytesPerSector As Long,
lpNumberOfFreeClusters As Long, lpTotalNumberOfClusters 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 Long
Dim FreeBytes As Long, TotalBytes As Long, PercentFree As Long, Dl As Long
Dim DrvName As String
List1.Clear
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