用VB函数Dir实现递归搜索目录

用VB函数Dir实现递归搜索目录

    我在很久以前就实现了这个方法了.它没有采用任何的控件形式.也没有调用系统API函数FindFirst,FindNext进行递归调用,和别人有点不同的就是我用的是VB中的Dir()函数.事实上,直接采用Dir()函数是不能进行自身的递归的调用的,但我们可以采用一种办法把Dir将当前搜索目录的子目录给保存下来,然后在自身的search(strPathName)递归函数中依次进行递归的调用,这样就可以把指定的目录搜索完毕.

    具体代码如下:

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'函数GetExtName

'功能:得到文件后缀名(扩展名)

'输入:文件名

'输出:文件后缀名(扩展名)

 '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

Public Function GetExtName(strFileName As String) As String
  Dim strTmp As String
  Dim strByte As String
  Dim i As Long
  For i = Len(strFileName) To 1 Step -1
     strByte = Mid(strFileName, i, 1)
     If strByte <> "." Then
        strTmp = strByte + strTmp
    Else
      Exit For
    End If
  Next i
  GetExtName = strTmp
End Function
Public Function search(ByVal strPath As String, Optional strSearch As String = "") As Boolean
  Dim strFileDir() As String
  Dim strFile As String
  Dim i As Long
 
  Dim lDirCount As Long
  On Error GoTo MyErr
  If Right(strPath, 1) <> "/" Then strPath = strPath + "/"
  strFile = Dir(strPath, vbDirectory Or vbHidden Or vbNormal Or vbReadOnly)
  While strFile <> "" '搜索当前目录
        DoEvents
        If (GetAttr(strPath + strFile) And vbDirectory) = vbDirectory Then '如果找到的是目录
           If strFile <> "." And strFile <> ".." Then '排除掉父目录(..)和当前目录(.)
               lDirCount = lDirCount + 1 '将目录数增1
               ReDim Preserve strFileDir(lDirCount) As String
               strFileDir(lDirCount - 1) = strFile '用动态数组保存当前目录名
           End If
        Else
            If strSearch = "" Then
               Form1.List1.AddItem strPath + strFile
            ElseIf LCase(GetExtName(strPath + strFile)) = LCase(GetExtName(strSearch)) Then
              '满足搜索条件，则处理该文件
               Form1.List1.AddItem strPath + strFile  '将文件全名保存至列表框List1中
            End If
        End If
        strFile = Dir
  Wend
  For i = 0 To lDirCount - 1
      Form1.Label3.Caption = strPath + strFileDir(i)
      Call search(strPath + strFileDir(i), strSearch) '递归搜索子目录
  Next
  ReDim strFileDir(0) '将动态数组清空
  search = True '搜索成功
  Exit Function
MyErr:
  search = False '搜索失败
End Function