以下代码演示了如何用Windows API函数遍历指定驱动器、目录的所有文件。其思路是：调出浏览文件夹窗口让用户指定所要搜索的起始路径，然后用查找文件的API函数遍历该目录下及其包含的子目录下的所有文件。本例需要：一个按钮，一个TextBox和一个ListBox，其中，TextBox应设置为多行。

核心代码参照API-Guide的两个例子程序，特此声明。

Option Explicit

'查找第一个文件的API

Private Declare Function FindFirstFile Lib "kernel32" Alias "FindFirstFileA" (ByVal lpFileName As String, lpFindFileData As WIN32_FIND_DATA) As Long

'查找下一个文件的API

Private Declare Function FindNextFile Lib "kernel32" Alias "FindNextFileA" (ByVal hFindFile As Long, lpFindFileData As WIN32_FIND_DATA) As Long

'获取文件属性的API

Private Declare Function GetFileAttributes Lib "kernel32" Alias "GetFileAttributesA" (ByVal lpFileName As String) As Long

'关闭查找文件的API

Private Declare Function FindClose Lib "kernel32" (ByVal hFindFile As Long) As Long

'以下为调用浏览文件夹窗口的API

Private Declare Sub CoTaskMemFree Lib "ole32.dll" (ByVal hMem As Long)

Private Declare Function lstrcat Lib "kernel32" Alias "lstrcatA" (ByVal lpString1 As String, ByVal lpString2 As String) As Long

Private Declare Function SHBrowseForFolder Lib "shell32" (lpbi As BrowseInfo) As Long

Private Declare Function SHGetPathFromIDList Lib "shell32" (ByVal pidList As Long, ByVal lpBuffer As String) As Long

'常量

Const MAX_PATH = 260

Const MAXDWORD = &HFFFF

Const INVALID_HANDLE_VALUE = -1

Const FILE_ATTRIBUTE_ARCHIVE = &H20

Const FILE_ATTRIBUTE_DIRECTORY = &H10

Const FILE_ATTRIBUTE_HIDDEN = &H2

Const FILE_ATTRIBUTE_NORMAL = &H80

Const FILE_ATTRIBUTE_READONLY = &H1

Const FILE_ATTRIBUTE_SYSTEM = &H4

Const FILE_ATTRIBUTE_TEMPORARY = &H100

Const BIF_RETURNONLYFSDIRS = 1

Private Type FILETIME

dwLowDateTime As Long

dwHighDateTime As Long

End Type

'定义类(用于查找文件)

Private Type WIN32_FIND_DATA

dwFileAttributes As Long

ftCreationTime As FILETIME

ftLastAccessTime As FILETIME

ftLastWriteTime As FILETIME

nFileSizeHigh As Long

nFileSizeLow As Long

dwReserved0 As Long

dwReserved1 As Long

cFileName As String * MAX_PATH

cAlternate As String * 14

End Type

'定义类(用于浏览文件夹窗口)

Private Type BrowseInfo

hWndOwner As Long

pIDLRoot As Long

pszDisplayName As Long

lpszTitle As Long

ulFlags As Long

lpfnCallback As Long

lParam As Long

iImage As Long

End Type

'自定义函数

Function StripNulls(OriginalStr As String) As String

If (InStr(OriginalStr, Chr(0)) > 0) Then

OriginalStr = Left(OriginalStr, InStr(OriginalStr, Chr(0)) - 1)

End If

StripNulls = OriginalStr

End Function

'自定义函数

Function FindFilesAPI(path As String, SearchStr As String, FileCount As Integer, _

DirCount As Integer)

Dim FileName As String ' 文件名

Dim DirName As String ' 子目录名

Dim dirNames() As String ' 目录数组

Dim nDir As Integer ' 当前路径的目录数

Dim i As Integer ' 循环计数器变量

Dim hSearch As Long ' 搜索句柄变量

Dim WFD As WIN32_FIND_DATA

Dim Cont As Integer

If Right(path, 1) <> "\" Then path = path & "\"

'搜索子目录

nDir = 0

ReDim dirNames(nDir)

Cont = True

hSearch = FindFirstFile(path & "*", WFD)

If hSearch <> INVALID_HANDLE_VALUE Then

Do While Cont

DirName = StripNulls(WFD.cFileName)

If (DirName <> ".") And (DirName <> "..") Then

If GetFileAttributes(path & DirName) And FILE_ATTRIBUTE_DIRECTORY Then

dirNames(nDir) = DirName

DirCount = DirCount + 1

nDir = nDir + 1

ReDim Preserve dirNames(nDir)

End If

End If

Cont = FindNextFile(hSearch, WFD) '获取下一个子目录

Loop

Cont = FindClose(hSearch)

End If

' 遍历目录并累计文件总数

hSearch = FindFirstFile(path & SearchStr, WFD)

Cont = True

If hSearch <> INVALID_HANDLE_VALUE Then

While Cont

FileName = StripNulls(WFD.cFileName)

If (FileName <> ".") And (FileName <> "..") Then

FindFilesAPI = FindFilesAPI + (WFD.nFileSizeHigh * MAXDWORD) + WFD.nFileSizeLow

FileCount = FileCount + 1

List1.AddItem path & FileName

End If

Cont = FindNextFile(hSearch, WFD) ' 获取下一个文件

Wend

Cont = FindClose(hSearch)

End If

'如果子目录存在则遍历之

If nDir > 0 Then

For i = 0 To nDir - 1

FindFilesAPI = FindFilesAPI + FindFilesAPI(path & dirNames(i) & "\", _

SearchStr, FileCount, DirCount)

Next i

End If

End Function

'查找按钮代码

Sub Command1_Click()

Dim SearchPath As String, FindStr As String

Dim FileSize As Long

Dim NumFiles As Integer, NumDirs As Integer

Dim iNull As Integer, lpIDList As Long, lResult As Long

Dim sPath As String, udtBI As BrowseInfo

With udtBI

'设置浏览窗口

.hWndOwner = Me.hWnd

'返回选中的目录

.ulFlags = BIF_RETURNONLYFSDIRS

End With

'调出浏览窗口

lpIDList = SHBrowseForFolder(udtBI)

If lpIDList Then

sPath = String$(MAX_PATH, 0)

'获取路径

SHGetPathFromIDList lpIDList, sPath

'释放内存

CoTaskMemFree lpIDList

iNull = InStr(sPath, vbNullChar)

If iNull Then

sPath = Left$(sPath, iNull - 1)

End If

End If

Screen.MousePointer = vbHourglass

List1.Clear

SearchPath = sPath '选中的目录为搜索的起始路径

FindStr = "*.*" '搜索所有类型的文件(此处可另作定义)

FileSize = FindFilesAPI(SearchPath, FindStr, NumFiles, NumDirs)

Text1.Text = "查找到的文件数：" & NumFiles & vbCrLf & "查找的目录数：" & _

NumDirs + 1 & vbCrLf & "文件大小总共为：" & vbCrLf & _

Format(FileSize, "#,###,###,##0") & "字节"

Screen.MousePointer = vbDefault

End Sub