调用API函数得到磁盘上剩余空间的值

最直接的方法是调用API函数 GetDiskFreeSpace,函数声明如下:

声明：

Declare Function GetDiskFreeSpace Lib "kernel32" Alias 
"GetDiskFreeSpaceA" (ByVal lpRootPathName As String, lpSectorsPerCluster 
As Long, lpBytesPerSector As Long, lpNumberOfFreeClusters As Long, 
lpTtoalNumberOfClusters As Long) As Long


使用：

Private Sub Form_Load()
'VB Man 2001
'URL: http://goodvbman.yeah.net
'E-Mail: coolde@21cn.com

Dim Sectors as Long,Bytes as Long,FreeC as Long, TotalC as Long,Total as Long,Freeb as Long

'Retrieve information about the C:\
GetDiskFreeSpace "C:\", Sectors, Bytes, Freec, Totalc

'Set graphic mode to persistent
Me.AutoRedraw = True

'Print the information to the form
Me.Print " Path: C:\"
Me.Print " Sectors per Cluster:" + Str$(Sector)
Me.Print " Bytes per sector:" + Str$(Bytes)
Me.Print " Number Of Free Clusters:" + Str$(Freec)
Me.Print " Total Number Of Clusters:" + Str$(Totalc)
Total = rTotalc& * rSector& * rBytes&
Me.Print " Total number of bytes in path:" + Str$(Total)
Freeb = rFreec& * rSector& * rBytes&
Me.Print " Free bytes:" + Str$(Freeb)
End sub

计算规则:磁盘上剩余空间(字节)=磁道(Sector) *剩余扇区 *每扇区的字节数