取得某个目录底下所有文件大小总和

含目录底下的子目录，求得其所有文件大小之总和
    其第二个叁数的目的是起始Static型态的totbyte,呼叫它时，请不要传叁数进去
Private Sub Command1_Click()
Dim tot As Long
tot=GetDirTotalByte("c:\tools\")
Debug.Printtot
End Sub

Private Function GetDirTotalByte(CurrentPath As String,Optionali As Long) As Long
Statictotbyte As Long
Dim nI As Integer,nDirectory As Integer
Dim sFileName As String,sDirectoryList() As String
注释：Initialtotbyte,ifitisnottheRecursivecallthefunction
If i<>1 Then
totbyte=0
End If
注释：Firstlistallnormalfilesinthisdirectory
sFileName=Dir(CurrentPath,vbNormal+vbHidden+vbReadOnly+vbSystem+vbArchive)
Do While sFileName<>""
totbyte=totbyte+FileLen(CurrentPath+sFileName)
sFileName=Dir
Loop
注释：Nextbuildtemporarylistofsubdirectories
sFileName=Dir(CurrentPath,vbDirectory)
Do While sFileName<>""
注释：Ignorecurrentandparentdirectories
If sFileName<>"." And sFileName<>".." Then
注释：Ignorenondirectories
If GetAttr(CurrentPath&sFileName)_
And vbDirectory Then
nDirectory=nDirectory+1
ReDimPreservesDirectoryList(nDirectory)
sDirectoryList(nDirectory)=CurrentPath&sFileName
End If
End If
sFileName=Dir
Loop
注释：Recursivelyprocesseachdirectory
For nI=1 To nDirectory
GetDirTotalBytesDirectoryList(nI)&"\",1
Next nI
GetDirTotalByte=totbyte
End Function