用VB函数Dir实现递归搜索目录

王朝vb·作者佚名 2006-01-09

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

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

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