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.Print tot
End Sub
Private Function GetDirTotalByte(CurrentPath As String, Optional i As Long) As Long
Static totbyte As Long
Dim nI As Integer, nDirectory As Integer
Dim sFileName As String, sDirectoryList() As String
注释：Initial totbyte, if it is not the Recursive call the function
If i <> 1 Then
totbyte = 0
End If
注释：First list all normal files in this directory
sFileName = Dir(CurrentPath, VBNormal + vbHidden + vbReadOnly + vbSystem + vbArchive)
Do While sFileName <> ''
totbyte = totbyte + FileLen(CurrentPath + sFileName)
sFileName = Dir
Loop
注释：Next build temporary list of subdirectories
sFileName = Dir(CurrentPath, vbDirectory)
Do While sFileName <> ''
注释：Ignore current and parent directories
If sFileName <> '.' And sFileName <> '..' Then
注释：Ignore nondirectories
If GetAttr(CurrentPath & sFileName) _
And vbDirectory Then
nDirectory = nDirectory + 1
ReDim Preserve sDirectoryList(nDirectory)
sDirectoryList(nDirectory) = CurrentPath & sFileName
End If
End If
sFileName = Dir
Loop
注释：Recursively process each directory
For nI = 1 To nDirectory
GetDirTotalByte sDirectoryList(nI) & '', 1
Next nI
GetDirTotalByte = totbyte
End Function
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